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A variable screening method based on energy flow analysis is provided for significant variables selection in crashworthiness optimizing. Two quantities, significance and specific energy absorption, are used to screen design variables. These quantities are calculated from energy relation matrix and energy absorption of parts. Energy relation matrix is built from finite element crash simulation result to describe energy flow path in parts during impact. The method is applied in the case of a car engine room under frontal impact. Optimization for lightweight using response surface method is performed on the reduced variable set at a relatively low computational cost.

Vehicle crashworthiness is one of the most important indicators to assess the automotive performance, which is directly related with passenger’s life and safety. Therefore, more attention has been paid to improve the automotive passive safety. This paper presents the analysis method based on energy flow analysis to solve the automotive crashworthiness problem. The energy transfer model is built based on the constraints analysis for product performance and the rational energy flow element partition. According to the energy transfer model, the energy absorption of each component can be attained from the finite element crash simulation result and also the energy distribution relationship can be analyzed. Based on the analysis results, the full front impact crashworthiness of a car is improved by modifying the energy flow path and distribution. It also demonstrates that the method is effective to solve the automotive crashworthiness problem.

This paper presents the design method of electromechanical products for saving energy based on energy flow analysis. The energy transfer model and energy correlation model are built through analyzing the relation of energy flow and products performance in order to address the conflict between energy saving and performance optimization. Based on the energy transfer model, the performance pertinences and performance margins of electromechanical products are analyzed with CAE technology and value engineering theory. Finally, the split air-conditioner’s outdoor unit is studied and the design method for saving energy based on energy flow analysis is adopted to solve the conflict between air flow increasing and noise reduction.