C8 Paper #66 Disclaimer—This paper partially fulfills a writing requirement for first year (freshman) engineering students at the University of Pittsburgh Swanson School of Engineering. This paper is a student, not a professional, paper. This paper is based on publicly available information and may not provide complete analyses of all relevant data. If this paper is used for any purpose other than these authors’ partial fulfillment of a writing requirement for first year (freshman) engineering students at the University of Pittsburgh Swanson School of Engineering, the user does so at his or her own risk. THE MICROMECHANICAL ROBOBEE Ryan Rohm, [email protected], Mahboobin 10am, Zach Romac, [email protected], Mahboobin 10am Abstract— Arguably, one of the most important projects within mechanical engineering and robotics is the RoboBee. The RoboBee is a small flying robot that is just half the size of a paperclip, but is capable of controlled flight, which scientists can utilize to pollinate plants in the absence of bees. The team of mechanical and robotic engineers at Harvard that created the RoboBee were tasked with selfmanufacturing the micro sensors, microcontrollers, and actuators made of piezoelectric material that allow it to flap its wings in response to electrical stimuli. These micro mechanic advancements are what make the RoboBee a possible solution to the drastic decline in bee population. Agriculture would suffer greatly with the extinction of bees and humans would be left to counteract the diminishing crop yield and decline in agricultural jobs with the RoboBee. The technological solution would leave the RoboBee to pollinate crops that are consumed by millions of people across the world. To display the RoboBee’s connection to mechanical engineering, we researched the piezoelectric materials and optical flow sensing control systems that provide the RoboBee with the ability to fly. We will also identify ethical dilemmas that surface by introducing a robot to compete with an existing species. Through investigation, we plan to display the growing need for RoboBees when considering the diminishing bee population on Earth. While doing so we want to make known that RoboBees can solve problems, while creating others. U.S are losing so many bees in a year that the population will not be able to bounce back to its original size. This net loss of bees, year after year, with no means of increase means a steady decay of the bee population which will result in extinction. The pollination performed by the honeybee affects millions of people across the world and as hives begin to dwindle, agriculture stands to take a major toll. Following the drastic decline in bee population Robert Wood and his colleagues began a project called the RoboBee[2]. The RoboBee is a microscopic bee that is only the size of a nickel and has the capability to fly and pollinate crops as a normal bee does. Since the RoboBee is the only robot of its kind, the mechanical and robotic engineers at Harvard were tasked with self-manufacturing the micro sensors, power source and actuators that allow the bee to fly[2]. They also must attempt to match thousands of years of evolution so the RoboBee can independently act as a living bee does. This includes the ability to communicate, make decisions, and act effectively as a cohesive swarm. The effort to develop this microscopic robot with the ability to perform prolonged flight and cognitive recognition of its surroundings is opening new doors for micromechanical devices. This includes furthering research into manufacturing of micro structures, micro fuel cells, optical sensing, and testing micro-robots. Key Words— Bees, Drones, Colony Collapse Disorder, Micro robotics, Optical flow sensors, Piezoelectric materials, Technology in agricultural, Manufacturing THE MICROMECHANICS OF THE ROBOBEE In the development of the RoboBee, the Harvard team had the strenuous task of developing a method of manufacturing the microscopic parts. Since the use of these parts on such a small scale is not the norm in robotics, the researchers were forced to manufacture their own parts[2]. One of the main focuses behind the RoboBee manufacturing process is that it had to be efficient to allow for mass production. This is because the bees main value is to work as a collective swarm just like real bees. Thus, they developed a method of lamination that lent itself not only to effective strength and flexibility but also to an assembly line type production [2]. This production process was detailed in Wood’s article “Flight of RoboBees” which was published by Nature.com. The body was constructed out of a mix of hard carbon fiber THE MECHANICAL SOLUTION TO THE DIMINISHING BEE POPULATION Honeybee hives across the world are diminishing rapidly due to an epidemic called colony collapse disorder. In the NRDC’s writing ‘Would a World Without Bees Be a World Without Us?’ Brian Palmer reports that the “magic number” for population loss is around 19% [1]. Any loss below that threshold is sustainable, however two thirds of beekeepers that answered the USDA survey displayed losses above 19% [1]. This means that two thirds of the bee colonies kept in the 1 University of Pittsburgh, Swanson School of Engineering Submission Date: 03.03.2017 Ryan Rohm Zach Romac sheets and thin softer polymers. These materials are both lightweight and strong. Since the RoboBee has limited space for structural materials, they must be small to accompany the necessary battery and computing power for the bee. These materials are first precisely cut-out using an ultraviolet laser [2]. The machined cut-outs help to add flexion points to the carbon fiber giving it increased mobility. Then the thin polymer layer is sandwiched in between the hard sheets of carbon fiber with an adhesive between each layer. The soft polymer core in between the carbon fiber helps to add more flexibility which increases the durability of the body. During the adhesion process the pieces are held together using a flat 2D substructure, and when the lamination is complete the pieces can be popped out of the substructure similar to how a children’s pop-up book works [2]. This process can be seen in figure 2 below. robots run using electromagnetic motors and gears but at such small scales they become too inefficient as frictional forces become more influential [2]. Because of this inefficiency, the Harvard researchers exploited the converse piezoelectric effect to produce mechanical energy. Piezoelectrics are materials, most commonly crystals or ceramics, that produce an electric current when introduced to stress or strain, and conversely can deform when introduced to an electric current [3]. Within a piezoelectric material the dipoles of the structure normally cancel out, but when subjected to a current, this charge symmetry is broken. The material then deforms to restore this state of symmetry. This property allows them to take electric input from a power source and convert it to the mechanical output of it deforming. In the application of the RoboBee, this allows the materials to mechanically operate the wings of the robot when the battery gives off electrical impulses. This process mirrors the muscles within a bee’s body which contract when an impulse is sent from the central nervous system, but in this case a battery is acting as the central nervous system and the piezoelectric actuators are the contracting muscles. In this way, the Robobee pulls inspiration from the nature of the bee, but how the wing operates is slightly different. The contractions occur both in a forward and backward motions resulting in two strokes. The resulting flapping that this causes is not like that of a bird’s or bee’s wing, which is more up and down, but is like the stroke used by your arms when you tread water [2]. This means that as the actuator contracts back and forth the wing moves through an inward and outward semicircular motion. The stroke being forward and back helps to conserve energy by reducing the drag on the wing. This motion reduces the surface area that is moving through the air with each stroke. This is easy to see when the stroke is compared to that of a person treading water. When you attempt to tread by flapping up and down, you must move the whole surface area of your arm up against the water after each useful down stroke, making it very inefficient. A normal forward and back water treading stroke gives the impression of cutting through the water because you are moving only the thinner edge of your hand and side of your arm through the water rather than the whole surface area. This direct proportionality between surface area and drag force can be seen in the drag force equation below. FIGURE 1[2] The pop-up manufacturing process This figure shows how the layers are laminated and into a flat sheet with the design of the structure precisely cut-out. The first reason this method is effective is because it allows all the precision cuts to be made all at once on one sheet as opposed to each individual piece being cut out then machined and attached separately. The second reason is that the pop-up method allows the structure to just be popped out into its 3D shape. This eliminates the need to place and attach pieces in the correct 3D orientation. While the manufacturing process had to be freshly designed so did the other components of the RoboBee. Piezoelectric Materials The main challenge of flight for the RoboBee is the power and weight tradeoff and the inefficiency of the standard mechanical devices when utilized at such a small scale. Most 2 Ryan Rohm Zach Romac prolonged flight, and that the RoboBee cannot fly for more than a few seconds even while connected to a power source [5]. Research and development teams have searched to find a power source small enough yet strong enough to sustain flight. The article “Flight of the RoboBees” in Scientific American describes this struggle: “Superficially, the task appears nearly impossible. Bees have been sculpted by millions of years of evolution into incredible flying machines. Their tiny bodies can fly for hours, maintain stability during wind gusts, seek out flowers and avoid predators. Try that with a nickel-size robot” [2]. As if attempting to mimic a creature sculpted by evolution is not hard enough, powering a minute machine that functions to this caliber seems impossible. Living creatures constantly interact with each other and their environment to obtain energy and resources, and it is not always possible to mimic every interaction. Seemingly, the most strenuous aspect of this task is powering all the hardware required to operate the RoboBee. evolution Currently research is being done toward using a solid oxide micro fuel cell as a power source to solve this problem [6]. These fuel cells create electrical energy from chemical energy. The major difference of this type of power supply compared to a heat engine is that it is limited by inefficiencies due to friction and heat loss. This is because the energy transfer is from chemical energy to electrical energy instead of chemical energy to mechanical energy as it is in the normal heat engine. The Oak Ridge National Laboratory managed by the US department of energy provides a scientific description of this process which has then been summarized: The hydrogen ions from the natural gas break down upon contacting the anode, forming an electron and positively charged hydrogen ions. The electrons then pass through a circuit to the cathode. There, due to its high electronegativity oxygen gas from the air is collected and accepts the electrons. Then the oxygen is passed back through an electrolyte which separates the anode and the cathode. Upon reaching the anode the charged oxygen ion reacts with two hydrogens forming water [7]. A diagram of the solid oxide fuel cell can be seen below in figure 3. FIGURE 2[4] Drag force equation This equation illustrates the direct proportionality of A(Ap) and the drag force(FAF). The rotation of the wing about the hinge that connects the wing to the body is uncontrolled and allowed to passively interact with the air [2]. The passive rotational control system helps to conserve energy by eliminating the need for a mechanical output to rotate the wing, and the need to send and process wind pattern information and then interpret those signals into rotational output. The rotation functions as a passive motion because the wing is left to rotate freely based on the wind. The active motion performed by the RoboBee moves the wing up and down in a flapping motion, whereas the rotation of the wing is left up to the wind patterns which oppose it. This change requires no energy from the robot and is left to be determined by the wind gust which it faces. These are small adjustments that make a huge difference on a small scale. Possible Fuel Source Since the RoboBee weighs a 100th of the weight of the current lightest autonomous flying robot, the researchers’ investigation into making the RoboBee was on the cutting edge of micro robotics. The challenge of creating a RoboBee that can withstand prolonged flight, as well as have cognitive recognition of its surroundings lies in the weight of the computing and power components. Robert Wood spoke on his team’s microscopic development in the article, “This Robotic Bee Just Took Flight” by saying, “There were no motors small enough, no sensors that could fit on board. The microcontrollers, the microprocessors-everything had to be developed fresh” [5]. The team is still attempting to develop new technology that can be housed in a robot the size of a nickel, however much progress has been made. Although prototypes have been created, the bees struggle to fly without a power cable attached. Robert Wood summarized that there is not a single power source that is capable of powering 3 Ryan Rohm Zach Romac technology offers GPS, accelerometers, and multi-axis gyroscopes, but such sensors are typically too heavy or consume too much power to be useful. Hence, we are investigating an electronic vision system that is similar to what natural bees have-one that analyzes ‘optical flow’ the apparent motion of objects in the visual field of an image sensor.” [11]. This optical flow is the motion of objects relative to the motion of the observer. The bee must be able to not only discern different objects based on colors and edges, but also the location and movement of those objects relative to its own motion. This is evident in the conference paper by Bermudez and Fearing of Berkeley; “However, flapping flight in insects increases unsteadiness in the visual input, which these insects generally account for by moving their heads to counteract it” [10]. This means that like real insects, the RoboBee must recognize its motion relative to its surroundings, and then control its motion to counteract this movement and produce a steady hover. The sensor that the RoboBee uses to sense this stimulus is the Centeye FireflySmall vision chip. “The FireflySmall chip is a variable acuity image sensor chip designed for embedded vision and robotic applications. This chip has a 128 x 256 array of logarithmic response pixels” [11]. The chip takes the color information for each pixel and stores it in part of an array, but what is unique about the logarithmic response is that instead of storing the whole range of light, it takes the logarithm of these color intensity input values narrowing the range. These color inputs are then transmitted as voltage output that can be interpreted by a processing unit. This color information is how the RoboBee can differentiate between two objects. It notices the edge of an object by noticing the difference in color values. The narrowing of the range using the logarithmic function is crucial in the RoboBees application because it means a smaller voltage output range when this color information is then transmitted as voltage. A smaller voltage range means smaller power draw, which means fewer constraints on battery size. The physical testing of the sensors without the fully functional flight would be impossible. However, to test their new technology the researchers developed a testing software that allowed them to virtually replicate an environment in which the RoboBee would fly so they can monitor the RoboBee’s responses to hypothetical stimuli. This software is the Hardware in the Loop system or HWIL [11]. This system created 3D renderings of a virtual environment of which the virtual sensors’ readings could be monitored allowing the researchers to see how the sensors would behave in the real world [11]. Basically, this system created a realistic projection of an outdoor scene like a video game. Then the researchers could test how the sensors would respond to this type of stimuli and how the actuators would function in response to what the sensors indicated. This allowed them to optimize the function of the sensors virtually without having to wait on technological improvements to allow physical runs. In this simulation, the sensors are attached to the front of the virtual RoboBee and can control the actuators to adjust its FIGURE 3[8] Solid oxide fuel cell diagram In this process, the electrons flowing through the circuit are the useful electrical energy, and water is the byproduct. These fuel cells are relatively low cost and low emission because the main waste product is just water vapor. Most importantly in the case of the RoboBee, these fuel cells are not size restrictive. This means that they can be scaled down to meet the size requirements of this micro robot. The downside to these fuel cells currently is that the solid oxide electrolyte in between the anode and cathode can only operate at very high temperatures of between 600 and 1000 degrees Celsius. The reason for this is that the solid oxide is not ionically active below this temperature [9]. This means that the it lacks the kinetic energy to act as an electrolyte and cannot allow ions to pass to the anode. Research is still being done to find an electrolyte that can operate at lower temperatures, which would hopefully allow them to be utilized in the RoboBee. Although the researchers are still awaiting a major development in a high-density power sources, the development of flow sensing and visual data collection has made great strides toward the fight of the RoboBee. Optical Flow Sensors One of the main draws of power in the bee are the optical flow sensors. RoboBees must control their motion, interact with other RoboBees, avoid predators, sense crops; basically, they must act as though they are normal bees. When RoboBees are utilized in the wild to act freely and pollinate flowers, they will require constant recognition of their surroundings as well as the ability to constantly control their flight mechanisms. This requires sensors to observe the environment and the processing power to process it. Although we have GPS technology and optical sensors that are utilized in autonomous cars, these are often too heavy and require too much power to be used in the bee. Scientific American elaborates on the investigation by saying “Modern 4 Ryan Rohm Zach Romac motion. The RoboBee in this simulation was limited to movements forward, upward, and rotational or otherwise forces in the X and Z plane with a rotational torque [3]. perform tasks. Programmers are currently developing methods to program interactions between a colony of RoboBees not just the individual. Although each robot will have personal commands and programs, its functions and tasks will be based on an overarching program that spans the entire colony, not just a single bee. In the early 1990’s, programmers developed various codes and programs in the field of swarm intelligence [2]. These algorithms span social interactions, division of work, and even search and rescue, but despite this progress, a swarm of robots cannot be managed as one. The primary goal of the algorithm that spans each colony is to house a program that gets translated from global instructions to individual behavioral programs [2]. The development of such programs is still ongoing, however there are two primary languages to start from, the Karma System and the OptRad (Optimizing Reaction-Advection-Diffusion) [2]. The Karma System was described by Robert Wood “In the Karma language one can specify a flow chart of tasks that the colony must achieve. The flow chart contains links that represent conditions that trigger new tasks. The Karma system uses information that comes back from individuals to adjust the allocation of resources to tasks in a way that mimics the role of the hive in real honeybee colonies” [2]. The Karma system is extremely functional as the bees are programmed to make real-time adjustments. The Karma system also allows the RoboBees to coordinate their actions amongst themselves, which eliminates the reliance on a single leader. Although the Karma System allows the RoboBees to promptly act according to a plan, there is minimal ability to adapt during a task. This lack prompted researchers to develop a second system, the OptRAD theory. The other approach to programming the swarm’s interaction is the OptRAD (Optimizing Reaction-AdvectionDiffusion). This concept treats the RoboBees as though they are a liquid that diffuses through the environment. Each RoboBee will use an algorithm to determine if it should perform a task based on the current state of the environment that it is in. The OptRAD system allows the colony to operate at a high level of reasoning due to treating the RoboBees as a liquid. The swarm will be able to reason through new circumstances and the expected outcomes of different scenarios [2]. Although the diffusion-like properties of the swarm allow them to have a high level of reasoning, it also allows them to properly allocate resources. Changes in environmental conditions will allow the swarm to disperse and cover a new area of land and place a priority on a certain task. Both systems have a way to allocate resources and a combination of the two would provide a highly efficient dispersion method as well as the ability to make real time decisions. When the RoboBees are in the wild performing tasks it is crucial that they can properly allocate resources as well as have a controlled set of tasks to perform. For instance, when a swarm is implored into a search and rescue scenario it is crucial that they are focused in an area that has seen the FIGURE 4[10] Motion of RoboBee in HWIL System While this seems to have limited the motion of the RoboBee to an oversimplification of its real 3D movements, if it is able to move in just these two directions and rotational it can actually attain all three directions of motion. For example, if you initially face the x direction, a rotation of ninety degrees obtained by the applied torque will have you facing the y direction and thus a forward force will then move you in the y direction. This simplification of the motion into only two directions allowed them to simplify the signals that needed to be exchanged between the flow sensors and the actuators. While this system did allow them to effectively prove the use of the optical flow sensors and the communication between the sensors and the actuators, the weight of the processors needed to process these optical flow signals is still an issue. The “brain”, or the processors of the RoboBee represent another area in which the need for increased research into new technological developments has arisen. The developers of the RoboBee plan to build the ‘brain’ in layers. There will be certain sections that react to the physical environment, a layer that handles basic functions, and then a final programmable level to make upper-level decisions [2]. Although different sections will house different programs they must all be looped together so the bee can recognize a situation, and adapt to the stimuli. So far the computing and processing that controls the actions of the RoboBee have been done on an outside computer during the tests, and the processors required to handle this information cannot be supported by the RoboBee structure. This means that adding in the wireless communication needed for the bees to interact as a swarm is also too large to be placed on the RoboBee currently. This, along with the power source shortcomings, mean that the RoboBee is still unable to take untethered flight. Applications and effects on Humans The RoboBee’s primary capability, much like that of the bee, is in its ability to act as part of a cohesive swarm to 5 Ryan Rohm Zach Romac most wreckage. During times of disasters and hazardous conditions, the RoboBees can be implored to perform search and rescue tasks. Proper dispersion patterns are crucial, so there is not an unbalanced rescue. The Karma System would allow the bees to fly over an area that has been struck and search for sign of life. By responding to the main program and documenting results, the swarm can increase or decrease the number of bees they send to certain locations. The OptRAD system can then be combined with the Karma System so the bees have a preconceived plan of tasks to accomplish. This list would put precedent on searching for people before all else. By combining the high level of reasoning in the OptRAD system and the adjustable dispersion of resources of the Karma system the RoboBee swarm would house a strong basis for colony wide interaction and rescue. The microscopic size of the RoboBee will allow them to be manufactured relatively cheaply and in large quantities, making them more disposable than other robots. Their ability to exist in large amounts, and interact as a swarm, gives them many foreseen applications in search and rescue and exploration of places typically unfit for human exposure. Behind the hundreds of foreshadowed applications lies the primary use of the RoboBee, and that is its ability to counter the colony collapse disorder that is currently pushing bees onto the endangered species list. The RoboBee has hundreds of functions because of its microscopic size, however the predominant uses are its work in agriculture, search and rescue and exploration. nearly one-third of the food we consume, making it necessary to provide immediate attention to the effects of pesticides and disease that cause CDD (Colony Collapse Disorder) [12]. White House officials described the loss of bees by stating that the loss of the bee species “requires immediate attention to ensure the sustainability of our food production systems, avoid additional economic impact on the agricultural sector, and protect the health of the environment” [12]. Although the RoboBee is still in development, its foreshadowed ability to pollinate crops as a real bee does gives a counteraction to the diminishing bee population. Sustainability Strong efforts must be made to regenerate and recover from the drastic losses of honey bees. Not to be misunderstood, the RoboBees seek to counteract the demolition of the bee population, not replace natural pollinators indefinitely [12]. Once RoboBees are implemented, bees in the wild and on farms can be gathered by beekeepers and kept in conservatories to help repopulate their colonies, while shielding them from CCD in the wild. Since CCD is caused by the pesticides used in agriculture, moving these bees into conservatories will keep them away from pesticides and allow them to increase their population. RoboBees will continue pollination while these bees can repopulate in conservatories which will prevent a sacrifice in crop yield. In the bee farms and conservatories scientists will be able to properly house bees and keep them outside of the devastating conditions that are causing their decline. Efforts are currently being made to conserve bees, however agriculture cannot simply take a halt while bee colonies reform. Without providing relief to the current bees, there is no way to regenerate their populations. This temporary regrowth period buys agriculture valuable time to adjust and move away from these damaging pesticides. Once the bee population grows back to normal levels, and the potential for CCD is eliminated, the bees in conservatories will be released into the wild and onto farms. Although RoboBees appear to be an efficient fix for the diminishing bee population, their technological needs make them far from completion. These technological needs are also accompanied by an extensive funding requirement. The financial stress of funding more research in fields such as oxide fuel cells is very large, and no results are guaranteed. Despite the Robobee’s application as a relief tool to the suffering bee population, the continued research and development of the RoboBee make it an extremely costly alternative. One must also consider who is left to pay for such robots. Governments, Universities, private practices, and conservation organizations will all be forced to join and develop a method to provide millions of dollars’ worth of funding if the RoboBees are to be used in place of natural pollinators. One must question whether the funding will be supplied to this cause when the suffering bee population has been ignored by the U.S government and population alike. Search and Rescue A swarm of RoboBees that can communicate and disperse over vast distances would bring revolutionary efficiency to search and rescue teams. Time is crucial during any search and rescue mission, and few seconds can separate victims from life and death. By utilizing RoboBee’s, the rescue team would more rapidly detect the location of victims and can then allocate resources to specific points of need. Although drones can currently function similarly in search and rescue, the RoboBee has the potential to be more economically efficient. The increased functionality of the RoboBee allows it to be more versatile across many disaster sites. For example, if the RoboBee was inserted into the aftermath of a natural disaster such as an earthquake or hurricane, it could be equipped with sensors that allow it to detect carbon dioxide emission. When utilizing this sensor, a swarm of RoboBees would be able to cover vast amounts of wreckage in search of the exhalation of trapped humans. Agriculture Governments across the world have implemented programs and initiatives to attempt to preserve the bee population that has faced a drastic decline due to habitat loss and disease. Honeybees are responsible for the pollination of 6 Ryan Rohm Zach Romac [1] B Palmer. “Would a World Without Bees Be a World Without Us?” 5/18/15. Accessed 1.10.2017. https://www.nrdc.org/onearth/would-world-without-bees-beworld-without-us [2] R. Wood. “Flight of Robobees.” Scientific American. 2.19.2013. Accessed 1.10.2017. http://www.nature.com/scientificamerican/journal/v308/n3/f ull/scientificamerican0313-60.html [3] N. Jafferis. “Multilayer laminated piezoelectric bending actuators: design and manufacturing for optimum power density and efficiency”. Smart Materials and Structures. 4.13.2016. Accessed 1.9.2017. http://iopscience.iop.org/article/10.1088/09641726/25/5/055033/meta [4] C. Patiῆo, L. Romero, J. Quiroga. “Study of the Design Variables for a Wet-Chamber Gas Meter Prototype (MGCH)”. SCIELO. 10.21.2004. Accessed 3.28.2017. http://www.scielo.org.co/scielo.php?script=sci_arttext&pid= S0122-53832004000100008 [5] A. Schwartz. “This Robotic Bee Just Took Flight, To Pollinate Crops and (Maybe) Spy On You” 5.30.13. Accessed 1.10.2017. https://www.fastcoexist.com/1682095/thisrobotic-bee-just-took-flight-to-pollinate-crops-and-maybespy-on-you [6] D. Basulto. “New RoboBees show that the future of robots is very, very small” 9.7.2014. Accessed 1.10.2017. https://www.washingtonpost.com/news/innovations/wp/201 4/08/07/new-robobees-show-that-the-future-of-robotics-isvery-very-small/?utm_term=.f1d6b8361adf [7] “Fuel Cells: Clean Power Source for Homes and Cars?”. Oak Ridge National Laboratory. Accessed 2.11.2017 http://web.ornl.gov/info/ornlreview/v33_2_00/fuel.htm [8] S. Writers. “SOFC Micro CHP Plants to be Climate Friendly Power Stations in Homes” Energy Daily. 12.1.2010. Accessed 3.27.2017. http://www.energydaily.com/reports/SOFC_Micro_CHP_Plants_To_Be_Clima te_Friendly_Power_Stations_In_Homes_999.html [9] N. Minh, M. Mogensen. “Reversible Solid Oxide Fuel Cell Technology for Green Fuel and Power Production”. The Electrochemical Society. 12.1.2013 Accessed 3.28.2017. https://www.electrochem.org/dl/interface/wtr/wtr13/wtr13_p 055_062.pdf [10] F. Bermudez and R. Fearing. “Optical flow on a flapping wing robot,” in Intelligent Robots and Systems, 2009. IROS 2009. IEEE/RSJ International Conference on, 2009, pp. 5027–5032 [11] P. Duhamel, J. Porter, B. Finio, et.al. “Hardware in the Loop for Optical Flow Sensing in a Robotic Bee”. 9/30/2011. Accessed 1.10.2017. https://micro.seas.harvard.edu/papers/Duhamel_IROS11.pdf [12] A. Erickson. “Robotic Bees are now being built to pollinate crops instead of real bees” 10.5.2016. Accessed 1.10.2017. http://www.collectiveevolution.com/2016/10/05/robotic-bees-are-now-being-builtto-pollinate-crops-instead-of-real-bees/ The cost of these RoboBees does not end in the developmental stage. The RoboBees “brain” will be preprogrammed and the robot will utilize algorithms and coding sequences to make decisions and allocate resources in real time. Although research and observations will be conducted so the programmers will be able to set priorities and precedence, the decision making that has been evolutionarily sculpted in a living bee will not exist in a RoboBee. It will require a team to constantly manage the operation of these RoboBees to ensure that they are functioning correctly. This cost of operation on top of the hefty funding of research can make the RoboBee non-cost effective. SIGNIFICANCE TODAY As CCD continues to degrade bee populations with no signs of stopping we must make a valiant effort to save our planets’ pollinators. The RoboBee is still in test phases and cannot be a certain solution, however with technological advancements in energy dense power sources and processing, the RoboBee has the potential to counter CCD before its’ effects are too drastic. The work done by engineers and robotic scientists is all in attempt to mimic the naturally developed actions of a honey bee colony. Their system to reverse engineer the bee’s daily processes proposes multiple challenges, especially the implementation of daily actions into a miniscule robot. Although researchers have confronted multiple obstacles, they have developed new manufacturing techniques, micro- actuators, optical flow sensors, and virtual hardware testing software that maintains the possibility of autonomous flight by the RoboBee. The new manufacturing techniques will pave the way for future micro robotic research groups while the micro actuators and optical flow sensors will allow them to build on Wood’s teams’ research instead of putting time into manufacturing micro-parts from scratch. Beyond the RoboBees individual functions are its communication capabilities through a swarm. The Karma System and the OptRAD algorithms allow the RoboBees to interact and function as a cohesive swarm, which is vital to their function in agriculture and search and rescue. By having thousands of disposable robots to send into disaster scenes, rescue teams can increase their efficiency during crisis situations. Researchers and scientists can also utilize the RoboBee to conduct research and visit places that are regularly impossible for a human to venture. This application would allow researchers to send a RoboBee thousands of places, from a dense rainforest to an underground oil pipeline. It’s bright applications in search and rescue, and its dire need in agricultural solidify the RoboBee as an important technological advancement of today. SOURCES 7 Ryan Rohm Zach Romac ACKNOWLEDGEMENTS We would like to acknowledge our friends Marlo and Chris for giving us the idea to research the RoboBee. Without their help our research would not be possible. 8
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