变频调速起重机起升动载特性

为了精确计算起重机的起升动载,提出了采用广义精细积分法对起重机提升系统动载特性进行分析,并采用该方法研究了不同提升工况下,变频调速起重机提升系统吊重起升过程中的动态响应历程,得到了各种加速方式下起重机的动载特性.计算结果表明:起升动载系数与起升速度成线性关系,与加速时间成指数函数关系;与有级调速相比,采用变频调速技术的起重机系统起升动载降低了10%～60%. 

Lifting Dynamic Characteristics of Crane with Frequency Control

For purpose of calculating the lifting dynamic load in a crane accurately, a generalized precise direct integration method was proposed to analyze dynamic characteristics of the load-lifting system of the crane. Using this method, the dynamic responses of the system during the load-lifting process of the frequency conversion crane were studied, and the dynamic characteristics of the crane system under various accelerating modes were obtained. The results show that the dynamic lifting coefficient is linear with the lifting speed and exponential with the acceleration time. Compared with the step speed regulation, the frequency conversion speed regulation can reduce the hoisting dynamic load of the crane system by 10% to 60%.