Development of a Calibration Device for Vibrating Wire Strain Gauges Based on Hydraulic Drive

Traditional vibrating wire strain gauge calibration devices generally use manual or low-power motor drives as the driving force, making it difficult to meet the calibration requirements of vibrating wire strain gauges that require large measurement forces. To address this issue, a hydraulic-driven vibrating wire strain gauge calibration device has been designed and developed. The calibration device can be adjusted within a range of 50-200 mm, and a universal fixture has been designed to achieve clamping and fastening of vibrating wire strain gauges of different sizes, models, and shapes. The device features a compact structure and convenient, labor-saving operation. It has been verified that the hydraulic drive greatly reduces the force required for calibration, while the calibration results remain consistent with traditional strain gauge measurement data. The experimental measurement uncertainty U=0.6% (k=2) is less than 0.7%, meeting the calibration specification requirements.