Semi-driving type variable stiffness dynamic vibration absorber made from conical springs

Abstract

The invention provides a semi-driving type variable stiffness dynamic vibration absorber made from conical springs, belonging to the technical field of vibration control. The semi-driving type variable stiffness dynamic vibration absorber comprises two mass blocks, a high-stiffness plate, two small-stiffness plates, two conical springs, a threaded rod, a stepping motor and a real-time monitoring and controlling system. The weights of the two mass blocks are the same, the two mass blocks are respectively arranged at two ends of the upper surface of the high-stiffness plate with a center hole, one large-diameter ends of the conical springs are respectively fixed at the upper surface and the lower surface of the high-stiffness plate, one small-diameter ends of the conical springs are respectively fixed on the two small-stiffness plates, one small-stiffness plate is fixedly arranged in a main structure, the threaded rod penetrates through the circular hole of the high-stiffness plate, two ends of the threaded rod are respectively in threaded connection with the small-stiffness plates, the directions of screw threads are opposite to one another, the top end of the thread rod is connected with an output end of the stepping motor, and the output end of the stepping motor is electrically connected with the real-time monitoring and controlling system. According to the semi-driving type variable stiffness dynamic vibration absorber, the semi-driving type control is easy to realize, the stiffness can be continuously adjusted, the semi-driving type variable stiffness dynamic vibration absorber is good in vibration absorbing effect, large in vibration absorbing range, quick in response, high in precision, and small in energy consumption.

Description

technical field [0001] The invention relates to a variable stiffness dynamic shock absorber, in particular to a semi-active variable stiffness dynamic shock absorber made of a conical coil spring, which is mainly used in ships, automobiles, offshore working platforms, long-span bridges, etc. with multiple frequencies The vibration control of a structure belongs to the technical field of vibration control. Background technique [0002] The dynamic vibration absorber is a commonly used vibration reduction control device. Its mechanism is to apply the environmental load to the structure and the double tuning principle of the vibration reduction device placed on the structure to absorb a large amount of vibration energy to achieve the vibration reduction effect. The key to improving the damping efficiency of a dynamic vibration absorber is to determine the best natural frequency of the vibration absorber, that is, to determine the best tuning stiffness. The tuning stiffness of ...

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Problems solved by technology

The tuning stiffness of the traditional dynamic vibration absorber is fixed, and the vibration reduction bandwidth is relatively small. In the existing technology, the patent number is 200820153430.7, and the invention patent named "dynamic vibration absorber" uses a mass block and a support to connect through vulcanized rubber to form a dynamic vibration absorber. The dynamic vibration absorber is prone to misalignment when the external excitation, the main vibration mode of the structure and the inherent dynamic characteristics change

Even if dynamic vibration absorbers with multiple tuning masses are used, most of them have not reached the maximum vibration reduction state, and the vibration reduction efficiency of dynamic vibration absorbers cannot be fully achieved; Zhang Hongtian et al. "The electric dynamic vibration absorber proposed in the article, although its stiffness can be changed through active control methods, the energy consumed is too large; Williams et al. proposed in the article "Adaptive-passive absorbers using shape-memory alloys" The semi-active dynamic vibration absorber made of alloy, although it can use less energy to achieve a larger range of stiffness changes, but its frequency is discretely adjustable, discontinuous, and the temperature hysteresis is nonlinear. When the vibration absorber is working, the alloy rod Heat generated by alternating stress, thus changing the rigidity of the alloy rod, making it difficult to control the temperature

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