Layout Design Of A Three-dimensional Force Sensor

At present, strain force sensor occupies the main position in force sensors. Whendesigning strain force sensors, one of the key points is to determine the straindistribution of an elastic body. Maximizing strain response of the elastic body undera given loading is the main needs to be considered objective of designing strain forcesensor. At the same time, minimizing cross sensitivity need to be considered whendesigning multi-component force sensors. The thesis mainly focuses on usingtopology optimization method to obtain a layout of a cylinder three-dimensionalforce sensor, where the response strain is high and cross sensitivities are low. Theresearch contents and results are as follows:1. Multi-objective structural topology optimization.Structural topology optimization has concentrated on maximizing stiffness.However, there are many other objectives needs to be incorporated during thepractical engineering design. For example, the minima or maxima of displacement,the limited value of strain and stress, etc. Combing stress constraints andstabilization skills, a multi-objective optimization model has been proposed in orderto obtain a reasonable layout of strain force sensor.2. Optimization of three-dimensional force sensorCross sensitivity is key factor that hinders high performance and practicalapplication of multi-component force sensor. Therefore, we are pursuing a multi-component force sensor with fairly low cross sensitivity and condition numberof transmission matrix. Based on multi-objection optimization methods and multiplefabrication constrains, this thesis tries to maximize the strain response in theobjection domain under loading from three directions. At the same time, this thesisdiscusses the filtering method in order to topological optimize the cylinder elasticbody, simplify the shape of result of optimization, select the key size parameters forsizing optimization, and obtain a structure that can be manufactured.3. Design, measurement and calibration of three-component force sensor.This thesis analyzes the optimal structural by using finite element method,including the performance of strain in objection domain under loading from eachdirection, to obtain the strain output calculation formula with the goal of maximizingthe output. The thesis also to find strain output under loading from each direction toanalyze the transverse sensitivity. The strain-gages are set and the measuring circuitare designed according to the formula of the strain distribution and the strain output.The designed three-dimensional force sensor is manufactured, and its performancesare measured to validate the design method. This thesis paves the road for the futureresearch on design of other type multi-component force sensor.