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Abstract Outstanding anchor cable dynamometric system is urgently needed in anchor engineering of pre-stressed anchor cable so as to control tension during the process of anchor cable construction and monitor long-period variation of anchoring force. A breakthrough research has been made on the development of high performance anchor cable dynamometric system based on vibrating-wire sensor technology through theoretical research，laboratory study and field engineering experiment research. Here are the research results：(1) The newly-built mathematical model can improve the accuracy of vibrating-wire sensor and make error compensation for temperature. (2) The matching technique of string and operating diaphragm was adopted so that lag was decreased and accuracy of process was improved. (3) The low excitation circuit technology has been put into use that the inconformity of frequency was solved and the resolution of measuring instruments was enhanced. (4) The techniques of piston-conveying pressure and force conversion technology has been used to solve the vibrating-wire sensor problems of wide range，partial load effect，accuracy and long-term stability，which can be used to develop vibrating-wire sensors characterized with wide range，high-accuracy，high resolution and long-term stability. (5) Supporting detecting equipments，can directly display the physical quantity without additional errors but more accuracy. The newly developed anchor cable dynamometric system has achieved international leading level at aspects of accuracy，wide range，partial load，stability，reliability and environmental suitability that it can offer technical support for real-time monitoring of stress condition of pre-stressed anchor cable.
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Received: 14 April 2012
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2012, Vol. 31 
