Torsional Vibration Calibrator (TVC)
The Spectra Quest Torsional Vibration Calibrator (TVC) is specifically designed to provide an adjustable, yet constant speed variation. Commercial torsional vibration measuring instruments can be attached to the output shaft to check for accuracy and repeatability. The speed variation is achieved by driving a single Hooke's joint (universal joint) with a 1/2 horsepower DC motor controlled by a high frequency digital drive with encoder feedback. Misalignment is restricted such that it can only occur in one plane. The physical nature of a single Hooke's joint is that the angular velocity ratio to the driven shaft will vary in a predictable manner depending on t he amount of angular misalignment. By knowing the input speed and the angle of intentional misalignment, the speed variation on the output shaft can be calculated. Hence, the torsional vibration measuring instrument to be checked can be precisely driven in a known and controlled manner. Any deviation from the expected value is then the instrument error. Additionally, the TVC can be used as a means to check the accuracy of vibration measuring instruments that track speed variation, an educational aid, and a laboratory device to assist with modeling and rotor dynamics developments.
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Specifications
The TVC weighs approximately 115 lbs., fits on a desktop, and occupies a 3 ft. by 4 ft. space. The Hooke's joint angle can be adjusted from 0 to 30 degrees.
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