The mechanical torque input into the wind turbine drive train is a very useful measurement for tests performed on a test bench. To ensure the accuracy and the reliability, an accurate calibration of the torque measurement must be carried out and repeated within a certain period of time. However, owing to the high torque level and large structure size, such a calibration is both expensive and time consuming. To overcome this challenge, a new calibration method is proposed here. The method is based on the electrical power measurement, where a high level of accuracy is much easier to achieve. With the help of a special test process, a relationship between the torque‐measuring signal and the electrical power can be established. The process comprises two tests with the drive train running in different operating modes. The calibration is possible by carrying out the same test process on several different torque levels. Detailed uncertainty analysis of the method is presented, whereby the uncertainty can be calculated by means of matrix operation and also numerically. As a demonstration, the implementation of the method on a test bench drive train that contains two 5‐MW motors in tandem with the motors operating in a back‐to‐back configuration is also presented. Finally, some variations on the method and possible ways of achieving better accuracy are discussed.

中文翻译：

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关于在测试台上进行测试的风力涡轮机传动系上机械扭矩测量的实用校准方法的建议

输入到风力涡轮机传动系统中的机械扭矩对于在试验台上进行的试验是非常有用的测量。为了确保准确性和可靠性，必须对扭矩测量值进行准确的校准，并在一定时间内重复进行。然而，由于高扭矩水平和大结构尺寸，这种校准既昂贵又耗时。为了克服这一挑战，这里提出了一种新的校准方法。该方法基于电功率测量，在该测量中，更容易实现高精度。借助特殊的测试过程，可以在扭矩测量信号和电功率之间建立关系。该过程包括两项测试，其中传动系以不同的运行模式运行。通过在几个不同的扭矩水平上执行相同的测试过程，可以进行校准。对该方法进行了详细的不确定性分析，从而可以通过矩阵运算以及数值方式来计算不确定性。作为演示，还介绍了该方法在包含两个5 MW电机串联并背靠背配置的测试台传动系统中的实现。最后，讨论了在方法上的一些变化以及实现更好精度的可能方法。还介绍了该方法在包含两台5 MW电机并以背对背配置运行的测试台传动系统上的实施方法。最后，讨论了在方法上的一些变化以及实现更好精度的可能方法。还介绍了该方法在包含两台5 MW电机并以背对背配置运行的测试台传动系统上的实施方法。最后，讨论了在方法上的一些变化以及实现更好精度的可能方法。