Health evaluation of transmission mechanism in powertrain based on composite weight cloud model

The performance degradation of the powertrain in service significantly affects the stability and reliability of tracked vehicles. To assess the powertrain health state of tracked vehicles, this study proposes a health state evaluation method for the transmission mechanism of the powertrain based on a composite weight cloud model. Firstly, the model establishes a health evaluation indexes system for the transmission mechanism, calculates the subjective index weights based on the AHP method and utilizes the EWM-CRITIC method to compute the objective index weights. However, the subjective and objective weights have some limitations. Therefore, the weights of subjective and objective indexes are fused through the game theory to obtain the composite weights of indexes. Secondly, this research categorizes the health status levels of the transmission mechanism to establish an evaluation standard cloud model and combines index weights and data to generate a comprehensive cloud model. Then, the cloud memberships are calculated for different mileage comprehensive clouds to quantitatively analyse the cloud model. Finally, the feasibility of the composite weight cloud model health evaluation method is verified by comparing it with other health evaluation methods, which provides a reference for the health state evaluation of the powertrain.