Optimization Design Of Vehicular Continuous Automatic Beckelman Beam Mechanism

The Beckelman beam deflection test is a common method that can be directly used for the evaluation of the road surface quality.However,the Beckelman beam detection relies heavily on manpower and the road needs to be closed.In order to improve these problems,this paper designs a set of mechanisms that can automatically and continuously detect the road surface deflection by using the photoelectric bending rapid tester.This article focuses on the innovative design of a vehicle-mounted continuous automatic Beckelman beam mechanism.The main research contents are as follows.Firstly,according to the working flow of Beckelman beam deflection instrument,designing a continuous automatic deflection testing program,and optimizes the length of some links in the lifting system by using the nonlinear optimization function of matlab to make the photoelectric bending rapid detection.The instrument shall be kept as horizontal as possible during the first lifting and lowering so as to avoid hitting the ground when the angle of inclination is too large.The second is the detailed design of the deflection testing mechanism.Dynamic analysis of the linkage mechanism by using the D'Alembert's Principle,calculate the output force of the moving parts during the movement,choose the model of electric cylinder and electric push rod.According to power,transmission ratio and other parameters,select the motor model,calculate the gear module,select the chain model.To design the shaft structure and dimensions,select the coupling,linear bearing and rolling bearing model.Again,using ANSYS to calculate the stress and strain of heavily-loaded and frequently-used Components in deflection testing mechanism,change the structure of the component with much concentrated stress and great strain,recalculate and optimize the structure through command stream to provide basis for material selection and machining.Finally,using Adams flexible treatment of the rapid lift mechanism,set the different stiffness and damping coefficient,conduct multiple simulations,compare the vibration amplitude of the front end of the deflection tester,select the appropriate stiffness and damping parameters.Then use Adams/Vibration module to apply a sinusoidal signal to the structure,changes the signal frequency,analyzes the frequency characteristics,determines the frequency range of stable operation of the structure,and facilitates adjustment of system input or adjustment of system parameters.