基于整车虚拟道路行驶试验的车辆零部件疲劳分析

针对现有车辆零部件精确疲劳分析依赖成本高昂的实车试验的问题,提出了一种利用整车虚拟样机仿真分析零部件疲劳寿命的方法。该方法通过在ADAMS/CAR中用整车虚拟样机在虚拟道路模型上进行行驶试验,利用多体系统动力学基于模态坐标的求解特点,使用模态应力恢复技术准确还原出了用于零部件疲劳寿命分析的载荷历程。将该方法应用于某车辆双横臂前悬中的下控制臂,在较短的时间内获得了该零件的预测疲劳寿命、寿命安全系数及危险部位等信息。应用结果表明,该方法可作为汽车设计过程与测试过程中的有效试验手段。     

坦克推进系统分段寿命试验统计分析

本文用生存分析方法,对坦克分段寿命试验进行了统计分析,并从理论上说明了坦克分段寿命试验的合理性.     

舰艇核反应堆堆芯寿期的论证研究

服役年限是核舰艇可靠性要求的一个组成部分,影响其确定的一个主要因素是核动力装置反应堆的堆芯寿期。本文讨论了堆芯寿期与核舰艇服役年限的关系,在分析核燃料消耗的影响因素基础上建立其估计模型以供服役年限与堆芯寿期进行权衡,最后参考军情况,提出堆芯寿期的确定原则。     

导弹武器系统费用-效能分析研究

应用评价武器系统效能和全寿命周期费用理论,建立了导弹武器系统效能、费用和费用-效能分析模型。武器系统的费用-效能分析是一项较复杂的系统工程,它综合了系统战术、技术、经济多方面的因素,按优化原则进行处理,比较和权衡,在众多的方案中选出最优化的一种。     

火炮身管寿命的分布函数

本文运用可靠性理论和《130mm 加农炮剩余寿命的一种预测模型》一文的结果,证明火炮身管寿命服从 Weibull 分布,并以130mm 加农炮为实例,给出参数的比值估计方法.     

舰用锅炉过热器使用寿命的论证

鉴于某型舰用锅炉过热器破损的主因在于其内部腐蚀,而破损的主要方式是由管头的溃烂开始直至整个管头烂掉为止,导致管子的胀接松动而漏泄。因此,过热器的使用年限全取决于管头的腐蚀速度。通过确定过热器内管头的腐蚀率、锅炉年内运行时间以及保养时间等要素来估算过热器的使用寿命。     

鱼雷寿命周期费用研究技术

随着技术的发展,寿命周期费用的研究正日益受到关注。评述了国内外寿命周期费用方面的研究现状,介绍了鱼雷寿命周期费用研究方法的内容及用途,探讨了费用估算的一般方法,在鱼雷寿命周期费用分解原则的基础上给出了鱼雷寿命周期费用分解结构,讨论了寿命周期费用研究方法急需解决的主要问题,并对其今后的发展方向做了展望。     

Design of accelerated life testing plans under multiple stresses

Accelerated life testing (ALT) using multiple stresses is commonly used in practice to resemble the operating stresses at normal operating conditions and obtain failure observations in a much shorter time. However, to date, there is little research into the theory of planning ALT for reliability estimation with multiple stresses. ALT with multiple stresses can result in a large number of stress‐level combinations which presents a challenge for implementation. In this article, we propose an approach for the design of ALT plans with multiple stresses and formulate multistress test plans based on different objectives and practical constraints. We develop a simulated annealing algorithm to efficiently determine the testing plan parameters. We demonstrate the proposed method with examples based on an actual test conducted using three stress types. The obtained optimal test plans are compared with those based on fractional factorial design. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 60: 468–478, 2013     

The defence firm of the future

This paper offers the personal view of a senior executive in the Defence Procurement Agency about the future requirements of the defence industry’s principal UK customer. The focus here is on trying to identify the type of corporate behaviour and range of skill sets that the UK Government will need from defence suppliers, both primes and supply chain companies in the future. The concluding message from this ‘Customer View’ is that there is likely to be a continuing market for the company that specializes in delivering defence capability. It will be a company that will be looking for a long‐term relationship, with a specialist knowledge of its various national customers and a willingness to work openly and closely with them. It will be agile in its ability to bring together diverse technologies, to package them as a system and to deliver them either as hardware or as a service. Such suppliers will also need to innovate and to adapt at least as rapidly as the threats that they seek to counter.     

谈国人视野中的中国崛起

随着中国的快速发展,中国正在崛起已成为国内外有目共睹的事实。一些西方学者把中国崛起看成是对世界和平与发展的"威胁",中国人民则根据中国崛起所带来的巨大变化,把中国崛起看成是对人类文明的重大贡献。对中华民族而言,中国崛起造福13亿中国人,使中国人民基本过上了幸福的小康生活;对全人类来说,中国崛起惠及全世界,推动了世界经济的发展乃至人类文明的进步。