共查询到19条相似文献,搜索用时 329 毫秒
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对汽车尾门采用的新型长玻纤增强聚丙烯热塑性复合材料(PP-LGF材料)的轻量化技术进行介绍和分析。说明PPLGF材料在满足塑料尾门性能要求的同时,降低汽车尾门的质量,给造型提供了更多的自由度,有着非常广阔的应用前景。 相似文献
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针对微客尾门结构的轻量化设计问题,提出了一种基于稳健性多目标优化的尾门轻量化设计方法。首先通过灵敏度分析方法筛选出了对尾门性能贡献量较大的尾门零件厚度作为设计变量,并建立了尾门各个工况响应的近似模型,其次以尾门扭转刚度、下垂刚度、尾门前三阶模态频率和抗凹分析点为约束条件,以尾门质量最小和第一阶模态频率最大和弯曲刚度位移量最小为目标,利用NSGA-Ⅱ算法对尾门进行了多目标优化,通过蒙特卡洛模拟技术对尾门进行了6σ质量水平和可靠度分析,并进行了6σ稳健性多目标优化。最终结果表明:优化设计后尾门结构在满足各性能要求的情况下实现了轻量化,质量减轻了2.28 kg,且弯曲刚度和第一阶模态得到提高;同时尾门结构各工况性能的稳健性也得到改善,达到6σ质量水平。 相似文献
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随着汽车保有量的增长,交通事故带来的损失日益剧增,研究汽车的碰撞安全性能,成为各国汽车行业研究的重要课题。车头骨架是汽车的基体和主要承载部件,因此其结构性能的好坏直接关系到车身的寿命和整车性能。应用计算机仿真技术对某车头骨架的前碰撞区吸能部件进行了碰撞仿真和改进研究。提出改进意见,不仅使结构能够满足强度和刚度要求,而且还可以实现质量的轻量化。实验数据表明:汽车碰撞仿真设计是确保设计车辆具有良好碰撞性能的一种重要的方法和手段。 相似文献
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Jung Ho Lee Chang Ho Jung Seong Sik Cheon Jae Ung Cho 《Journal of Mechanical Science and Technology》2020,34(7):2775-2782
In this study, the lightweight composite materials of carbon fiber-reinforced plastic, aluminum and aluminum foam were applied as three different bonding m 相似文献
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前保险杠系统的轻量化可以减小能源消耗,降低成本,但须满足相关碰撞安全标准.在有限元软件HyperMesh中构建前保险杠系统模型,进行低速正面碰撞仿真验证模型的可靠性.定义变量、确定优化目标和约束条件后,创建Kriging代理模型,验证模型正确性.通过NSGA-II算法对代理模型优化求解,选取最优解,并根据仿真结果对最优... 相似文献
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综述应用钢铝一体化车身框架结构实现车身轻量化的最新进展及关键技术难点。在传统的车身骨架钢制结构中,有些构件或组件用铝合金代替,且通过优化设计和性能模拟方法确定钢铝的比例和以铝代钢的部位,可实现车身轻量化和高强度。但铝和钢可焊接性差、存在电化学腐蚀等问题,成为结构设计的难点。同时必须保证车辆发生碰撞时,车身结构的指定部位能够吸能碰撞能量。因此关键技术涉及钢铝连接技术、电化学腐蚀、碰撞安全、新的成型工艺技术、拓扑结构优化。 相似文献
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The process of water jet cutting has advantages over laser beam cutting, especially in the case of temperature-sensitive materials. Together with the foam and cellulose material processing, the processing of composite materials of lightweight structures is becoming more and more important. In order to meet given requirements, these sandwich constructions can have various types of cover layers (defined by e.g., sheet thickness and material) and consist of core materials (differing e.g., in geometry or in structure).
Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM-systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy-logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy-logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
Unlike simple sheets, multilayer structures have greater influence on the cutting result. When the process is planned, the CAD/CAM-systems must take all sheets of the composite material into account in order to avoid manufacturing problems. Due to the great variety of composite materials and desired contours, the necessary knowledge or experience must be efficiently represented. There is no universal system model for all these variations. This paper suggests a fuzzy-logic theory to build up a knowledge base for the water jet cutting of composite materials. The knowledge contained within the fuzzy-logic base proves to be efficient, due to the relatively high speed at which it can be acquired and due to the possibility to apply it to different structures. Development and structure of the necessary linguistic rule base are presented using sinusoidal composite material made of aluminium as an example. The expert system optimized according to the given design parameters determines the optimal cutting speed for the desired cutting contour. 相似文献
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智淑亚 《机械设计与制造工程》2012,(9):104-106,109
车身轻量化在汽车轻量化中起着非常重要的作用,采用轻质材料是当前车身轻量化的主要途径。分析了几种轻量化材料的特点,针对车身结构特点及性能要求,综述了轻量化材料在国内外汽车车身中的应用及其发展趋势。 相似文献