A device and method for testing the rotational damping coefficient of an eddy current damper

Abstract

The invention discloses a device and a method used for testing rotation damping coefficients of an eddy current damper and relates to the inclined stay cable vibration control technology field. The top portion of a tester support of the device is fixed with a tester used for testing rotation torques and rotation speeds, the top portion of a motor support is fixed with a motor and a speed reducer, the motor and the speed reducer are connected through a driving mandrel, the center of the tester is horizontally provided with a tester mandrel, one end of the tester mandrel is connected with the driving mandrel through a first shaft coupling, the other end of the tester mandrel is connected with a damping shaft through a second shaft coupling, the outer portion of the damping shaft is sleeved with two positioning retainer rings fixed on the damping shaft and one wireless strain tester, the wireless strain tester is connected with at least three sets of three-dimensional strain gages, and the three-dimensional strain gages are fixed on the outer surface of the damping shaft and are uniformly and circumferentially distributed along the damping shaft. The device has advantages of simple structure, easy operation and high test precision.

Description

technical field [0001] The invention relates to the technical field of cable vibration control, in particular to a device and method for testing the rotation damping coefficient of an eddy current damper. Background technique [0002] Cable-stayed cables are important stress-bearing components of cable-stayed bridges. Due to their small initial damping and large slenderness ratio, cable-stayed cables are prone to vibration problems under the action of traffic loads and external wind loads. After practice, it is an effective method to increase the modal damping of the cable system by installing cable dampers to control the vibration of the cable. There are many types of stay cable dampers, including hydraulic dampers, pulse dampers, rotary dampers, viscous dampers, and eddy current dampers. Among them, the eddy current damper is a new type of stay cable damper. Through the displacement transmission system, the damper converts the vibration of the stay cable into the rotation...

AI Technical Summary

Problems solved by technology

This method is closer to reality than the theoretical calculation model, but in fact the magnetic induction intensity of the permanent magnet itself is uneven, and the change of the magnetic induction intensity of the permanent magnet under the action of the magnet fixed disk is affected by the material properties of the magnet fixed disk. The parameters cannot be measured accurately, so there is a certain error in the input parameters of the finite element model, which leads to a certain error in the final numerical simulation results

[0006] The test method uses a universal testing machine, which cannot be directly applied. It is necessary to convert the rotational motion of the eddy current damping device into a linear motion, and the test method is relatively complicated.

In addition, the commonly used universal testing machine has a large tonnage, while the damping coefficient of the eddy current damper is small, which makes the accuracy of the test results not high

[0007] Comparing the above three methods, it can be seen that the shortcomings of theoretical calculation and numerical simulation are not easy to change (the error is large), and can only be used as a reference for the preliminary design of the damper. The final damping coefficient still needs to be determined through experiments; The operation is complex and the precision is not high

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