起重特性曲线 meaning in English

lifting performance curve

For the cranes which arm angle and length is alterable , its utmost hoist competence is changeable . so we must found the characteristic curve math model of the crane . then the plc programme can provide protection for the crane working according to the math model
对于臂杆角度和长度可变的起重机而言,其起吊重量极限值是变化的,这就要求事先建立这类起重机的起重特性曲线的数学模型,然后再让plc程序按照给定的数学模型对起重机进行安全作业保护。