Research And Development Of Virtual Innovation Experiment Platform For Mechanical Basis

In order to solve the shortcomings of traditional experimental teaching equipment and practical problems such as experiment limited by time and space.Using virtual reality and augmented reality technology,a virtual experiment platform for mechanical foundation with realistic image and easy operation is developed based on Unity3 D,MATLAB soft and practical experiment.The virtual innovation experimental platform has contained two parts which are the virtual assembly and disassembly of the reducer and the innovative design of the linkage mechanism.The virtual assembly and disassembly test of the reducer is divided into three major steps.Firstly,Solid Works was used to perform 3D geometric modeling of the reducer parts,and then the geometric model was imported into 3DMax to perform texture mapping,baking and material rendering,and finally saved into the FBX format and imported into the Assets3 D resource folder Assets.According to the needs of interaction and motion,constructing hierarchical data structure of virtual model is constructed,and the paternity relationship for each model is designed.The concrete operation of the experiment is carried out by C# programming.The innovative design of the link mechanism mainly includes two parts,namely the design of a hinged four-bar mechanism according to a predetermined trajectory and the design of a crank-rocker mechanism that takes into account the optimal force transmission performance with the ratio of stroke speed ratio.Standard position basic hinge four-bar mechanism of connecting rod angle Fourier series expansion was deducted and Fourier series expansion of link curve of general position four-bar hinge mechanism was established.A new method of comprehensive trajectory design for crank rocker mechanism was proposed.This method has the advantages of low optimization dimension,fast operation,high coincidence degree and independent of initial value.The length equations of each type I and II crank rocker mechanism are established.The maximum value of the included angle ?,the feasible range of the crank position angle ? and the position of the minimum transmission angle ?_min are obtained.The ?_min-?-? three-dimensional surface chart was drawn,the figure reflected the stroke ratio K and transmission performance of the best position,the crank rocker mechanism of the scale,and the simulation analysis had carried on.The design theory of crank rocker mechanism is perfected in this paper.