印刷机张力系统是个变参数的非线性系统，它变速范围大，所以采用的是变频器驱动交流电机作为执行机构。

Tension system of gravure printing machine is a nonlinear system with variable parameters, the change of this system is very wide, so the author USES frequency conversion motor as its executive body.

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频谱范围从机械连接器经由变速箱和电气传动技术到基于PC的控制系统。

This spectrum ranges from mechanical connectors via gearboxes and electrical drive technology to PC-based control systems.

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随着车辆自动变速器理论与设计制造技术的不断完善，其应用范围越来越广泛。

With the constant perfection in theory, design and manufacturing technologies of vehicle automatic transmission, its application scopes become wider and wider.

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