Performance Of Bionic Cantilever Sensor Inspired By Scorpions Trichobothria Sensilla And Slit Sensilla

Precision and ultra-precision manufacturing reflect the national manufacturing level,such as the processing and manufacturing of aero-engine turbofan blades and nuclear submarine propellers.At present,one of the main manufacturing problems is the hypersensitive sensing of mechanical signal.It is great significance to develop a new generation of sensors with high sensitivity to mechanical signals.In the sensor classification,cantilever sensor has become a common mechanical signal acquisition platform,which undertakes an important detection task in precision and ultra-precision manufacturing.The traditional cantilever sensor has been quite mature.The refinement and maturity of its structure make it get large-scale application in various industries.However,the traditional detection method of cantilever further limits its sensitivity.Reducing the size and developing new sensing materials are the main ways to solve the above problems,but this way increases the manufacturing cost and iteration cycle of the sensor.Many great inventions that affect the process of human civilization originate from bionic technology,and bionic thinking helps to produce new methods and new thinking,which has become a research hotspot.Scorpion,with 430 million years of evolution history,has evolved a hypersensitive mechanical quantity sensor on its body surface,and its sensing process is similar to that of cantilever sensor,which has farreaching guiding significance for the exploration and manufacture of bionic cantilever sensor.In this paper,Deathstalker scorpion and heterometus petersii are selected as the bionic prototypes to reveal two excellent mechanoreceptors on their body surface,namely,trichobothria sensilla and slit sensilla.The two kinds of sensilla show excellent perceptual characteristics.On this basis,the two kinds of sensors have similar perceptual structure,which provides the feasibility for the superposition of the two kinds of perceptual effects.Therefore,this paper analyzes their respective roles in the process of scorpion perception and their cooperative sensing mechanism.Through theoretical verification and experimental analysis,a combined bionic cantilever sensor with is designed and manufactured,and its sensitivity and reliability are characterized.The main contents of this paper are as followsFirstly,scorpions were selected as the research object,and the compressed trichobothria sensilla and slit sensilla on their body surface were morphologically characterized,and the compressed trichobothria sensilla extreme differential design model and the slit sensilla directional type stress concentration model were established.For the compressed trichobothria sensilla,the appearance resembles a cantilever structure,consisting of cantilevered hair rods with high aspect ratio and high elastic modulus and elastin with low aspect ratio and low elastic modulus,and the hair rods and elastin have great variability in elastic modulus and aspect ratio.For slit sensilla,slit are mainly reflected as dangerous structures of structural damage in engineering,mainly because of the stress concentration at the slit tip,and scorpions precisely use this stress concentration phenomenon to achieve mechanical signal pickup and collection,and realize the mechanical quantity signal collection in a specific direction in a certain area.On this basis,the feasibility analysis of the effect of combining the two sensilla was carried out.The compressed trichobothria sensilla mainly senses the mechanical signals from the three-dimensional spatial area,and achieves the lowest loss of energy in the process of mechanical signal transmission from the hair rod to the elastin of the limb,and this process is verified by finite element analysis.The slit sensilla mainly senses the in-plane mechanical signals and transmits the strain generated by the in-plane mechanical signals in the specified direction efficiently to realize the stress concentration in a specific area in two dimensions.The former sensilla maximizes the transfer of the external force in space to the plane region in the tail through the hair rod,and the latter sensilla concentrates the inplane signal twice,both of which realize the energy transformation from 3D to 2D and make the transformation process of the complex signal in space in the plane efficiently.Next,two types of bionic combined cantilever beam sensing elements were designed and fabricated.The first type is based on heterogeneous material and the second type is based on homogeneous material.Also,the slit structure was independently adapted and analyzed for the depth and angle.Different from the conventional crack sensor,the overall sensing structures are all conductive layers,and the hypersensitive transformation of electromechanical signals is directly realized through the change of large contact area.Finally,bionic combined cantilever beams are characterized for their performance,including flexible impact of water droplet potential energy,stress sensing,fatigue testing,etc.The future development trends and challenges of the bionic hairy seam combined cantilever beams are also discussed.