整鞋刚性测试方法研究

整鞋刚性是评价鞋类商品穿用过程中屈挠部位弯折状态和张力的重要依据。目前不同测试机构使用的仪器和测试过程中的操作不尽相同,导致相同款式的鞋类产品,刚性测试结果不同。以解决目前存在的问题为导向,从获得结果一致性的检测仪器设计方案为出发点,研制了整鞋刚性测试仪,并组织检测机构从测试样品、人员等多个因素对方法的准确性和稳定性进行了验证试验,为推广应用提供了科学、有力的支撑。

汽车轮胎的刚性对胎面磨耗的影响

文中研究了轮胎刚性对胎面耐磨性的影响,并介绍了测试轮胎侧向刚性和角向刚性的两种装置和测试方法。结果表明:当轮胎侧向刚性和角向刚性提高时,胎面耐磨强度随之降低。

汽车手制动操纵机构位移测量的简易方法

本文介绍了一种测量汽车手制动操纵机构位移的简便方法 ,用较简单的工具 ,根据点在平面上的投影确定机构的位置 ,给出测量步骤 ,推导位移量的数学模型 。

Research on dynamic characteristics model test scheme for middle pylon of multi-pylon multi-span suspension bridges

Multi-pylon multi-span suspension bridge is a new type super flexible structure system, and the rigidity design of middle pylon is one of the main difficult technical issues. Due to the requirements of longitudinal rigidity, the structural form and the corresponding foundation type of middle pylon are different from those of the ordinary steel pylon, and the complicated dynamic characteristics make the calculation quite difficult. In this article, exploration has been made in selection of similarity ratio and model materials, section simulation, restriction conditions simulation, fixing of mass blocks, fabrication scheme and testing method by taking into account different construction and working conditions such as restriction conditions and working environment of a three-pylon suspension bridge, to conduct the test experimental design of the dynamic behavior of the middle pylon, with the purpose to reveal its dynamic characteristics and make comparison and analysis with theoretical assumptions, to provide basis for anti-wind and anti-seismic design and reference for the design and research of three-pylon two-span suspension bridges in the future.