摘要
针对起重机轨道接头高低错位引起垂直冲击动力效应的问题,建立了起重机运行在高低错位接头轨道上所引起的动载荷轮一轨刚体动力学模型,分析轨道缺陷对起重机运行冲击的影响度。根据最大动能相等原理,对起重机整体系统等效转换为单自由度系统,利用等效单自由度系统应与整体系统具有相同的振动形式和频率得到其自振圆频率表达式·根据等效单自由度系统在接头高低错位处的响应建立轮-轨系统运动微分方程,获得等效单自由度系统在接头高低错位处的运行冲击表达式,并与ISO8686-1:2012《起重机载荷与载荷组合原则第一部分总则》中接头高低错位引起垂直冲击动力效应公式进行比对分析,进而为GB/T3811-2008《起重机设计规范》与ISO8686-1:2012《起重机载荷与载荷组合原则第一部分总则》方法的适用性提供理论依据。
To solve vertical impact dynamic effect resulting from height dislocation of rail joint of crane, a wheel-rail rigid body dynamic model with crane operating at dynamic load caused by rail joint dislocating is established to analyze impact of rail defect on running impact of crane. Whole crane system is converted into an equivalent single degree of freedom system according to the principle of equal maximum kinetic energy, and auto-oscillation circular frequency expression of the single degree of freedom system is obtained considering that the two systems have the same vibration form and frequency. Differential equation of motion of wheel-rail system is established based on the response of the equivalent single degree of freedom system at dislocated joint, resulting in running impact expression of the equivalent system at dislocated joint. This equation is compared with the equation of vertical impact dynamic effect due to height dislocation of joint given in ISO8686-1：2012 Cranes - Design Principles for Loads and Load Combinations-Part 1 ：General, thus, further theoretically proving methods in GB/T3811-2008 Design Rules for Cranes and ISO8686-1：2012 Cranes - Design Principles for Loads and Load Combinations-Part 1 ：General applicable.
出处
《起重运输机械》
2017年第10期57-64,共8页
Hoisting and Conveying Machinery
关键词
高低错位处
运动微分方程
运行冲击
dislocated joint
differential equation of motion
running impact
