【摘要】 为了同时满足稳健性和可靠性的目标,提出了一种基于寿命周期成本模型的容差设计方法。以高压电源为研究目标,同时考虑电源元器件的容差和退化建立高压电源寿命周期成本模型。首先,建立寿命周期成本的数学模型,由与元器件容差相关的生产成本和与元器件退化相关的使用成本两部分组成;进而,通过对高压电源进行灵敏度分析,确定寿命周期成本模型考虑的元器件;然后,建立生产成本和使用成本的多目标优化模型,通过遗传算法NSGA-II获得Pareto最优解集。最后,通过优化前后产品成本的对比结果验证了方法的有效性。更多还原

【Abstract】 This paper proposed a tolerance design method based on the life-cycle cost,which simultaneously considers manufacturing cost(MC) of the components and life-cycle usage cost(UC) of products to improve product quality.The manufacturing cost is calculated by the cost-tolerance model.The usage cost consists of the service quality loss cost and failure cost.The service quality loss is introduced by Taguchi quadratic function and the degradation model of components at a certain life-time.The failure cost is the money caused by the product performance being out of specifications.Based on the life-cycle cost,the tolerance optimization model considering the degradation model of components was established.The proposed method was illustrated on a high voltage power supply.The results show that the proposed method does not only reduce the manufacturing cost but also meet the requirement of robustness and reliability.更多还原