某SUV柴油车的NVH测试与治理控制

文章首先针对某柴油车的NVH(噪声、振动与舒适性)现状进行了摸底测试,包括针对右翼子板在某转速区域产生共振现象进行了振动测试,找出最大振动加速度值及其对应的转速范围。同时参照相关法规进行了50km/h车外通过噪声、四档60～120km/h加速噪声、等速噪声、定置加速工况噪声等测试。随后对该车进行NVH治理控制,主要措施包括:采用某公司的减振阻尼材料、吸音棉材料、在进气口加装预滤器,改变进气口位置等。最终测试结果表明:在典型高负荷工况下,整车进气系统进气量、整车动力性和排放性能没有恶化,翼子板振动值明显降低,车内噪声定置加速工况最高降幅达到16.6db,怠速、匀速均明显降低。有效改善了该车NVH性能。     

A real options reasoning approach to hybrid vehicle investments

Long term increases of petrol prices and the threat of a global climate change have created in the automotive industry a new competitive environment based on the development of more sustainable technologies. Using the real option reasoning lens we provide a theoretical framework to better account for the technological and market uncertainties and irreversibilities that impact the investment and innovation decisions of automotive firms supporting the development of more sustainable vehicle technologies. We investigate the case of hybrid vehicles in a transitional perspective by insisting on their potential to influence the dynamic shaping of investment decisions of firms in the car industry. We consider the hybridization strategy as intra-project and inter-project compound growth options to manage the flexibilities and irreversibilities of investment decisions during the transition process. We provide four different-sometimes conflicting-strategic rationales structuring the investment efforts of firms in hybrid vehicles and illustrate them with numerous examples from the automotive industry.     

SUV车变速操纵机构隔热方案优化设计

变速操纵机构是影响整车操纵舒适性能的重要机构,因此,变速操纵机构的合理化设计是至关重要的。文章通过SUV车在道路试验中出现变速操纵钢索被烤坏的现象,详细介绍了变速操纵机构隔热方案的优化设计过程,并通过试验验证了本次设计可以有效保护变速操纵机构。本次设计不仅解决了变速操纵钢索被发动机排气管烤坏的问题,填补了SUV车变速操纵机构隔热方案设计的空白,为SUV车隔热方案设计积累了宝贵经验,同时也提高了SUV车产品质量。