Powertrain Inertial Parameter Identification Based On Firefly Algorithm

The inertia parameter of the vehicle powertrain is the basic parameter for the design of the powertrain mounting system.At present,the commonly used method for testing the inertial parameters of the powertrain is only suitable under laboratory conditions.The tested powertrain inertia parameters do not match the actual values in the working state,which greatly increases the time and cost of the powertrain mounting system design and development.In this paper,the vibration acceleration signal of the powertrain mounting system under working condition is directly used,and the improved firefly algorithm is used to identify the parameters of the powertrain mounting system,and finally the inertia parameters of the powertrain are obtained.Based on the analysis of the advantages and disadvantages of firefly algorithm in parameter identification,chaos optimization,variable step size and improved original attractiveness are introduced,which improves the convergence speed and parameter identification accuracy of the algorithm.The parameter identification performance of the improved firefly algorithm was verified by the test function experiment.The feasibility of the inertial parameter identification of the vibration system based on the firefly algorithm is tested by the measured vibration acceleration signal of the two-degree-of-freedom vibration system.The ADAMS model of the powertrain mounting system is established,and the vibration acceleration signal of the suspension mounting point is simulated and calculated;the vibration differential equation of the powertrain mounting system is derived by Lagrange method,and the corresponding dynamic model is established in MATLAB/Simulink to calculate the dynamic response of the mounting installation point.The objective function of the firefly algorithm is constructed by using the root mean square value of the vibration acceleration of the mounting point.The improved firefly algorithm is used to identify the inertial parameter of the powertrain.The research results show that the improved firefly algorithm can effectively identify the inertia parameters of the powertrain mounting system under working condition,and the parameter identification accuracy is high and the robustness is good.