Research On Mower Engine Mounting System Based On Improved Gray Wolf Algorithm

With the continuous progress of economic and social development and the improvement of the quality of human cultural life,environmental greening is more and more affected by people's attention,and lawn mowers have also become common greening tools in our lives.However,the vibration and noise generated by the lawn mower engine greatly affect the health of the staff and the living environment and health of the surrounding people.Reasonable design of the suspension support system can not only effectively isolate the vibration of the powertrain and the impact caused by uneven roads,but also extend the service life of the engine and its components.Therefore,this article takes the mount lawn mower engine as the research object,collects relevant data through experimental tests,and uses ADAMS software to simulate and optimize the design of the deficiencies of the suspension support system.The main work content is as follows:First,research and analyze the source of the vibration environment noise of the mount lawn mower engine,elaborate and analyze the engine excitation force and excitation frequency,and then proceed to analyze the engine vibration isolation principle,mainly from a single degree of freedom forced vibration control system Based on the principle of vibration isolation and the information model of work road excitation transmission,the vibration isolation of the engine needs to be discussed in depth,and the different installation and placement methods of the suspension are analyzed.Through experiments,the basic parameters of the lawn mower engine such as mass,inertial product,and rotational inertia are measured to collect basic physical parameters.Secondly,design the suspension device according to the specific conditions of the lawn mower engine and the frame,establish a six-degree-of-freedom dynamics research model of the suspension system in the ADAMS software,and use the Vibration module to calculate the simulation data of the suspension system to obtain a system sixth order The natural frequency of the modal and the corresponding energy decoupling rate are compared with the calculation results of the mathematical physical model established in MATLAB software.By analyzing the modal frequency and energy decoupling rate of the engine mounting system,the design of the suspension The system is evaluated.Then,a gray wolf algorithm is proposed and improved.In view of the problem that the gray wolf algorithm has an imbalance between the global search ability and the local search ability,the strong global search ability can ensure the diversity of the population,and thestrong local search ability can ensure the algorithm for local accurate search.Speed ??up the convergence of the algorithm.This paper improves the convergence factor of the algorithm and adds the weight wolf and levy flight strategy,improves the previous global search ability and enhances the local search accuracy,and uses the improved gray wolf algorithm to test 23 standard test functions.The test results of other algorithms are analyzed.The improved gray wolf optimization algorithm has 11 averages closer to the theoretical value,10 test functions are better than the GWO algorithm,and all are better than the other two algorithms.Finally,according to the specific actual situation of the mower engine mounting system,the modal decoupling rate of the engine mounting system is set as the optimization target,and the stiffness range of the mounting element of the engine mounting system and the frequency of each order modal frequency Reasonable configuration is set as a constraint condition,the stiffness parameter of the supporting element of the mounting system is used as the design variable,and the code of the improved gray wolf algorithm written by MATLAB is used to optimize the parameters of the mounting system.State decoupling rate increased by an average of 19%,and then the optimized stiffness parameters were substituted into the rigid body dynamic model established in ADAMS for simulation calculation,the results of the two were compared and analyzed,and finally the MATLAB optimized suspension system The stiffness value was substituted in the ADAMS to establish the dynamic model of the lawnmower vehicle for simulation and verification.The vibration displacement of the lawnmower frame was reduced by 27.6% and the vibration acceleration was reduced by 45.5%,which significantly improved the engine vibration transmission.