Limiting power transmission tower vibration reduction damper

Abstract

The invention relates to a limiting power transmission tower vibration reduction damper. The damper comprises a cylinder barrel (3), a piston rod (2) and pistons (5), and is characterized in that: a throttling passage (1) is formed in the cylinder barrel (3); at least two pistons (5) are positioned in the throttling passage (1); an axial permanent magnet piston core (6) and a piston magnetic resistance body (8) are positioned between the pistons (5); the inner side wall of the cylinder barrel (3) is provided with a radial permanent magnet cylinder barrel sleeve (7), a cylinder barrel magnetic resistance body (9) and a cylinder barrel magnetic conductor (10); the piston rod (2) passes through the cylinder barrel (3) to be connected with the pistons (5); the cylinder barrel (3) is filled with magnetorheological fluid (12); and a magnetic shielding sleeve (14) is arranged outside the cylinder barrel (3). The damper can automatically switch corresponding vibration reduction forms according to amplitude of external vibration energy and has good limiting adaptive effect.

Description

technical field [0001] The invention relates to engineering vibration reduction technology, in particular, to a damper. Background technique [0002] In recent years, power transmission engineering structures have been frequently attacked by snow disasters and earthquakes, and various dynamic damages have caused increasing losses to power grid engineering structures. The development of transmission tower vibration control and damping technologies is gradually being popularized and applied. [0003] At present, the fluid damping technology is an excellent vibration reduction control method. It is based on the principle of pore flow. By adjusting the size of the variable cross-section pores, the value range of the damping coefficient is adjusted, and it has a good effect of vibration reduction and energy consumption. In recent years, The emergence of intelligent materials represented by magnetorheological fluids has injected new vitality into the development of damping technol...

AI Technical Summary

Problems solved by technology

However, most of the magnetorheological damping devices currently on the market require power control, and often require a stable low-voltage DC power supply, which is often difficult to guarantee under catastrophic damage

On the other hand, since catastrophic damages such as earthquakes and hurricanes are often difficult to predict in advance, and the effective performance of the damper depends to a large extent on the decision-making and driving of the external control system, so the control law and the sensor system are relatively important. Due to the high requirements, the improper selection of the control law and the error of the sensing system will have a greater impact on the performance and quality of the damper

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