0Cr13Ni8Mo2Al不锈钢表面钝化膜层耐蚀性分析

针对0Cr13Ni8Mo2Al不锈钢试验件,研究了不同的切削加工表面质量和钝化工艺对于钝化膜表面形貌结构、化学组成和耐腐蚀性能的影响.表面粗糙时钝化膜表面凹凸不平、犁沟较深、并存在微裂纹,较深的犁沟含有较高的P、S元素,是钝化膜易发生腐蚀的薄弱区.对不同温度制备的钝化膜进行电化学测试和盐水浸泡测试,结果表明,合适的表面...     

Q6W－1低地板部位转向架

本介绍国产首批70％低地板轻轨车拖动转向架的结构特点，并对独立轮对装置作了专门阐述，由于两车轮可以相对转动，踏面形状是设计的难点。     

离散变量优化设计方法及其在轻轨车车体设计中的应用

针对轻轨车车体的特点,在连续变量优化分析的基础上,提出了改进的离散变量优化算法.算法将约束条件中的应力函数按照泰勒级数在连续变量优化解附近展开,近似用设计变量的一次函数替代,然后在一定的误差范围内,剔除不符合要求的多数解,在少量剩余解中用有限元验算求得最优解.按此方法设计的车体已用于实际运行的轻轨车辆.     

离散变量优化设计方法及其在轻轨车车体设计中的应用

针对轻轨车车体的特点,在连续变量优化分析的基础上,提出了改进的离散变量优化算法。算法将约束条件中的应力函数按照泰勒级数在连续变量优化解附近展开,近似用设计变量的一次函数替代,然后在一定的误差范围内,剔除不符合要求的多数解,在少量剩余解中用有限元验算求得最优解。按此方法设计的车体已用于实际运行的轻轨车辆。     

涡流接近开关输出波形质量影响研究

涡流接近开关端面与被测金属体端面之间的探测距离、被测金属体的结构尺寸、接近开关外接上拉电阻的大小是影响接近开关输出波形质量的几个关键性因素.本文分析了它们各自对涡流接近开关输出波形质量的影响机理,并获得了控制它们影响程度的方法和设计准则,给出了几种典型试验曲线.研究与试验均表明:有关涡流接近开关输出波形质量影响因素的研究,有利于确定合适探测距离、设计被测金属体的结构尺寸和上拉电阻值,确保接近开关正常工作.     

Optimization and static strength test of carbody of light rail vehicle

Preliminary structure of light rail vehicle (LRV) carbody made of steel was designed considering its usage, strength, manufacturing, etc. Based on the finite element analysis, the optimization of design parameters associated with thickness of LRV carbody is carried out to increase the whole strength of the carbody and to reduce its mass. With the aids of the substructure technique and the modified technique with discrete variables in the optimization based on the finite element method, the consumed computing time is reduced dramatically. The optimized LRV carbody is re-analyzed by FEM to obtain its static strength and vibrating mode and is manufactured. The mass of the optimized carbody reduces about 1.3 kg, and the relative reduction ratio is about 10%. Then, the strength test of the real carbody under the static load is executed. It is shown by the numerical and test results that the design requirements of the LRV carbody are satisfying. The newly designed carbody is used in the LRV, which is the first one used commercially developed by China independently. Nowadays, the LRV is running on the transportation circuit in Changchun of China.