| Sun Xiao (孙晓),Wang Qiming,Zhu Ming,Wu Mingchang.[J].高技术通讯(英文),2015,21(4):479~484 |
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| Study and application of vibrating wire strain gauge in monitoring cable tension of FAST cable-net |
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| DOI：10.3772/j.issn.1006-6748.2015.04.015 |
| 中文关键词: |
| 英文关键词: FAST, cable force monitoring, vibrating wire strain gauge, health monitoring |
| 基金项目: |
| Author Name | Affiliation | | Sun Xiao (孙晓) | | | Wang Qiming | | | Zhu Ming | | | Wu Mingchang | |
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| 中文摘要: |
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| 英文摘要: |
| A cable net structure is selected to support its reflecting triangular aluminum panels of FAST (five-hundred-meter aperture spherical radio telescope). To ensure the security and stability of the supporting structure, cable force of typical cables must be monitored on line. Considering the stringent requirements in installation, accuracy, long-term stability and EMI(Electromagnetic interference), most of the commonly used cable force measurement methods or sensors are not suitable for the cable force monitoring of the supporting cable-net of FAST. A method is presents to accomplish the cable force monitoring, which uses a vibrating wire strain gauge to monitor the strain of linear strain area at the anchor head. Experiments have been carried out to verify the feasibility. The method has a series of advantages, such as high reliability, high accuracy, good dynamic performance and durability, easiness of maintenance, technical maturity in industry and EMI shielding. Theoretical analysis shows that there is a linear relationship between the cable body force and anchor head surface strain, and experimental results proves a good linear relationship with excellent repeatability between the cable body force and anchor head surface strain measured by the vibrating wire strain gauge, with a linear fit better than 0.98. Mean square error in practical measuring is 2.5t. The relative error is better than 4% within the scope of the cable force in FAST operation which meets practical demand in FAST engineering. |
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