Development Of A High Resolution Three-Component Strain Balance

Due to the increasing demand for bionic flapping-wing aircraft in the current society,the theoretical basis of traditional large-scale fixed-wing and rotor-wing aircraft is too different from that of small-scale flapping-wing aircraft,and there is no complete theoretical basis and data foundation at this stage.Or the sharp change of the Reynolds number when the wings flapping can easily lead to the instability of the movement of the miniature flapping wing aircraft,making the control of the miniature flapping wing aircraft more difficult.Therefore,the success of the development of the miniature flapping wing aircraft depends on its dynamic characteristics.According to the requirements of the laboratory flapping wing aircraft,a high precision small range three-component strain balance was designed.According to the current problems of the strain balance,the main problems are as follows(1)The contradiction between sensitivity and stiffness.(2)The coupling error between the various forces and moments interferes.(3)The signal output is small,the noise is large,the signal acquisition accuracy is poor,and the error is high.This paper proposes a specific solution.In this paper,a stress amplifying mechanism is designed.The increased measuring piece increases the rigidity of the balance.At the same time,the stress amplifying mechanism improves the sensitivity of the balance,improves the sensitivity of the balance while ensuring the rigidity,and solves the sensitivity and the stiffness.Contradictions.Since the measuring piece is in the neutral layer,the deformation is minimal under the action of the moment,which ensures the interference of the torque on the measurement result.According to the experimental requirements,the special patching method and circuit connection mode are designed,and the decoupling of the torque can be completed in the theoretical measurement of the circuit.And the balance is stiff,which also greatly reduces the coupling error between the balances.Through the ANSYS simulation of the force and modal analysis of the balance,the strain is analyzed under the combined action of the force X,Y,Z and the moments ??,respectively,and the interference of each measurement is analyzed,and Guidance on the design and improvement of the balance.At the same time,according to the strain change,the stress check of the balance is completed.Through the analysis of the acquisition principle and performance index of the data acquisition system,the selection of the amplifier and the data acquisition card is completed,and the data acquisition program is written by using the LabVIEW software.The data acquisition program can complete the functions of amplification,noise reduction,filtering,etc.,with high precision.The high accuracy can solve the problem that the balance signal output is small,the noise is large,the signal acquisition accuracy is poor,and the error is high.And the data acquisition program is very scalable,ready for the signal acquisition of the next six-component strain balance.The scale is repeatedly loaded by the weight of the pulley,and the balance is obtained by the data acquisition system to obtain the voltage signal,and the balance is decoupled by the matrix calculation.The calibration results are compared with the initial simulation analysis results and the material mechanics analysis results,and the balance manual is also produced to provide guarantee for future use and maintenance.