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论文类型：期刊论文

发表时间：2019-04-01

发表刊物：INSTRUMENTS AND EXPERIMENTAL TECHNIQUES

收录刊物：SCIE、EI

卷号：62

期号：2

页面范围：256-265

ISSN号：0020-4412

关键字：Deformation; Error compensation; Three term control systems, Compensation scheme; Functional relationship; Large displacements; Measuring precision; Mechanical deformation; Self-tuning fuzzy PID; Small displacement; Structural deformation, Displacement measurement

摘要：A method for measuring large displacements >800 mm with a precision of 0.0094% and an accuracy of 0.0125%, realizing the principle of measurement with walking pattern and utilizing two analog high-precision small displacement sensors as the measuring unit is presented. A self-tuning fuzzy PID controller with high adaptability is used to make two identical measuring subsystems work coordinately for reaching a large displacement measurement. A series of tests are conducted to verify the effectiveness of the method. Theresults show that this method has a good performance. The influence of the mechanical deformation on measuring precision is discussed, and the functional relationship between mechanical structural deformation and measuring error is found in the experiment. A feasible compensation scheme is built to eliminate the error caused by mechanical deformation.