Parameterized Analysis On Degree Of Freedom Of Mechanism And Software Design

In recent years,safety production accidents occur frequently in China.Although the number of deaths in agricultural machinery industry has been decreasing year by year since the rebound in 2012,the number of deaths each year still cannot be underestimated.Therefore,it is not only necessary to carry out safety management in production,but also to design an intrinsically safe mechanism from the source to minimize the safety accidents caused by the design defects of mechanical equipment.In the face of more and more intelligent human society,people's demand is increasing.In order to conduct a more in-depth study of the ever-changing mechanisms,first of all,it is necessary to analyze its degree of freedom so as to master its number and nature.Today's mechanism is more and more complex,the traditional formula of degree of freedom can not fully meet the analysis of the degree of freedom of complex mechanism.Therefore,on the basis of safety ergonomics,based on the theory of Principal-Parasitic motion,this paper explores and analyzes the calculation method of degree of freedom of mechanism,and establishes a more convenient and universal calculation method for the users.According to the physical and mathematical representation characteristics of the input motion elements and the output motion elements,the input DOF and the output DOF are defined.Based on the Principal-Parasitic motion theory,the principal motion and the adjoint motion of the mechanism are analyzed,and the transformation formulas between the input motion elements and the output motion elements are given.Based on the characteristics of the joint motion domain,the "six elements" feature description of the joint motion domain is analyzed,and the calculation formula of the joint motion capability is given.By introducing the transformation formula of input motion elements and output motion elements,and using the analytic diagram of joint motion domain,the kinematic capability of the branch chain of the parallel mechanism is analyzed,and the Planar Six-dimensional topological diagram of the mechanism is drawn,thus the number of degrees of freedom of the mechanism is obtained.Based on the new calculation method of degree of freedom derived from the Principal-Parasitic motion theory,the degrees of freedom of the RPPR series mechanism and the 4-RPPRR parallel mechanism are analyzed.Based on the theory of Principal-Parasitic motion,the program of calculating and analyzing the degree of freedom of mechanism is designed by VB,and a parameterized human-computer interface is constructed.The system of transformation formula of motion elements of input and output of mechanism is established,the parameters of mechanism are input under VB interface,the motion capability characteristic of branch chain is obtained quickly,and the Structure Diagram of mechanism is obtained by computer aided graphic software AutoCAD.Through the embedded development and application of the software,the data sharing and transmission between the software are realized,the number of degrees of freedom of the mechanism is obtained,and the validity and practicability of the system software are further verified.