The lightweight design of automotive can effectively reduce fuel consumption and pollutant emissions,which is one of the important measures to achieve energy conservation and emission reduction in automobiles.Topology optimization is a commonly used method for lightweight design of continuum structures.Due to the complexity of actual serving conditions,the topology optimization of continuum structures generally belongs to a topology optimization problem under multiple serving conditions,while the topology optimization results are influenced by many factors.The performance index PI for topology optimization under multiple serving conditions was introduced in this paper.And the selection method for weight coefficients was discussed based on numerical cases.In this way,the problem of weight coefficient selection was effectively solved for topology optimization of continuum structures under multiple serving conditions.Based on the above research,the balance shaft bracket of a heavy-duty commercial vehicle was selected as the application object.Topology optimization was conducted to reduce the weight of the balance shaft bracket.Results indicate that the balance shaft bracket has reduced weight by 28.1％on the premise of meeting performance requirements.
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