A method to measure load of wind turbine blade is introduced. To overcome difficulties of load signals collection, foil strain gauge is introduced to measure the loads of wind turbine blade. The principle of strain gauge is described, the method of choosing gauges and determining measurement point are explained. Wheatstone bridge method is used in the measurement in this paper. The influencing factors are summarized and the methods to reduce interference are developed in the results of blade measurements so as to ensure the accuracy and the reliability of the results.%提出了一种风机叶片应变量的测量方法.在测量过程中,载荷信号的采集难度较大,一旦采集不准确,将直接影响到整个软件系统的分析结果.文章主要讨论了如何利用箔式应变片进行测量的相关问题,阐述了箔式应变片的选择方法以及测点位置的确定方法,介绍了应变片的工作原理,并将惠斯通电桥法引入到叶片载荷测试中.在不同叶片的测量结果的比较中,分析了测量结果的影响因素,并指出了减小测量干扰的方法,提高了测量结果的准确性、可靠性.
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