A vertical-torsional nonlinear vibration damper

Abstract

The present invention discloses a vertical-torsional non-linear vibration damper, which comprises a motion mechanism, a fixing mechanism, a spring and steel balls; the motion mechanism is sleeved outside the fixing mechanism, one end of the spring is connected with the motion mechanism, and the other end is connected with the fixing mechanism; the steel balls are located in the grooves of the motion mechanism and the fixing mechanism. When the motion mechanism has a displacement, the spring generates a non-linear stiffness, and at the same time, the steel balls roll in the spiral grooves of the fixing mechanism. This vibration damper converts the displacement in the vertical direction into the displacement in the torsional direction to achieve the elimination of vibration in the vertical direction. The present invention can effectively absorb the vibration energy of the oscillator, can be widely used in various vibration environments, has a small mass, a small installation space and high reliability; and is convenient for installation and maintenance, and is durable.

Description

Technical Field

[0001] The present invention relates to the field of mechanical vibration damping, and particularly to a vertical-torsional nonlinear vibration damper. Background Art

[0002] Vibration control is of great significance in engineering fields such as military, infrastructure, aerospace, precision measurement and control, etc. Linear vibration absorbers are the earliest and most common vibration suppression devices in the field of passive control. However, they are very sensitive to the working frequency, and the efficiency outside the working frequency band will drop rapidly. Particularly importantly, they will affect the free vibration characteristics of the original system and change the original design performance. As an improvement, nonlinearity will be used in this vibration damper. Since the nonlinear vibration damper has no linear resonance frequency, it can achieve broadband vibration control and has no influence on the free vibration characteristics of the original system. Different from the structures of previous nonlinear vibration dampers, the vibration damper designed this time introduces a torsional structure, which has more possibilities and feasibility in terms of vibration elimination and vibration damping efficiency. Summary of the Invention

[0003] Aiming at the defects existing in the prior art, the present invention proposes a vertical-torsional nonlinear vibration damper, which converts vertical displacement into torsional displacement, changing the energy transfer mode of the existing vibration damper; through a special structure, it changes the direction of motion, reduces the motion range of the oscillator, reduces the required occupied volume space to a certain extent, improves the installation convenience, improves the vibration control efficiency, and is applicable to vibration damping in various vibration environments.

[0004] The concept for solving the technical problem of the present invention is as follows:

[0005] First, a structure similar to a thread is provided on the device that needs vibration damping. When it vibrates and generates displacement, the motion mechanism of the nonlinear vibration damper will also generate displacement accordingly. Through the meshing action of the thread structures on the device that needs vibration damping and the motion mechanism of the vibration damper, the motion mechanism of the vibration damper will generate a torsional motion while moving. Since the motion mechanism of the vibration damper is connected to the fixed mechanism through a spring and steel balls, when moving and twisting occur, the spring will produce a certain deformation. This deformation makes the vibration damping system generate a nonlinear torque, and at the same time, it will also bring an additional nonlinear constraint torque to the device that needs vibration damping. The regulation of this constraint torque can be achieved by designing spring parameters, thread parameters and other measures, thereby expanding the vibration damping frequency band to improve the vibration damping efficiency.

[0006] According to the above concept, the present invention adopts the following technical solutions:

[0007] A vertical-torsional non-linear vibration damper, comprising a moving mechanism, a fixed mechanism, a spring, and steel balls; the moving mechanism is sleeved outside the fixed mechanism, one end of the spring is connected to the moving mechanism, and the other end is connected to the fixed mechanism. The steel balls are located in the grooves of the moving mechanism and the fixed mechanism. When the moving mechanism undergoes displacement, the spring generates non-linear stiffness, and at the same time, the steel balls roll in the spiral grooves of the fixed mechanism.

[0008] The moving mechanism is of a cylindrical structure, and its upper end face has a spiral protrusion.

[0009] The fixed mechanism is of a cylindrical structure, with a spiral upward groove and a tapered hole groove engraved on its outer surface for placing the steel balls and the spring respectively.

[0010] The steel balls are evenly distributed around the center of the fixed mechanism, ensuring the stability of the entire damper during movement.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The present invention uses a non-linear cylindrical oscillator, which does not change the natural frequency of the original structure and has a wide-frequency vibration absorption effect. The moving mechanism and the fixed mechanism of the present invention are in a nested form, reducing the size and mass of the oscillator, improving the vibration control efficiency, and being applicable to various vibration environments, including micro-vibration environments. The present invention is installed at the structural support, which is convenient for maintenance; using a passive control strategy, the structure is reliable, low-cost and high-efficiency, and durable. Description of the Drawings

[0013] Figure 1 is the external schematic diagram of the present invention.

[0014] Figure 2 is the top view of the present invention.

[0015] Figure 3 is Figure 2 the sectional view taken along line B-B in

[0016] In the figure: 1, moving mechanism; 2, fixed mechanism; 3, spring; 4, steel ball. Detailed Embodiment

[0017] The following further describes the present invention with reference to the drawings.

[0018] As Figures 1 to 3As shown in the figure, a vertical-torsional nonlinear vibration damper includes a moving mechanism 1, a fixed mechanism 2, a spring 3, and steel balls 4. The moving mechanism 1 is sleeved outside the fixed mechanism 2. One end of the spring 3 is connected to the moving mechanism 1, and the other end is connected to the fixed mechanism 2. The steel balls 4 are located in the grooves of the moving mechanism 1 and the fixed mechanism 2. When the moving mechanism 1 undergoes displacement, the spring 3 generates a nonlinear stiffness, and at the same time, the steel balls 4 roll in the spiral grooves of the fixed mechanism 2.

[0019] The moving mechanism 1 is of a cylindrical structure, and its upper end surface has a spiral protrusion.

[0020] The fixed mechanism 2 is of a cylindrical structure, with a spiral upward groove and a conical hole groove engraved on its outer surface for placing the steel balls 4 and the spring 3 respectively.

[0021] The steel balls 4 are evenly distributed around the center of the fixed mechanism 2, ensuring the stability of the entire damper during movement.

[0022] Since the main movement forms of the moving mechanism 1, the spring 3, and the steel balls 4 of the damper are all spiral upward rotations, the space occupied by the damper is basically determined: the outer contour size is its movement space. Therefore, there is no need to specifically design and reserve a movement space for the damper, which reduces the design work and also improves the utilization efficiency of the carrier space.

[0023] The above-described vertical-torsional nonlinear vibration damper of the embodiment includes a moving mechanism, a fixed mechanism, a spring, and steel balls. The moving mechanism is sleeved outside the fixed mechanism. One end of the spring is connected to the moving mechanism, and the other end is connected to the fixed mechanism. The steel balls are located in the grooves of the moving mechanism and the fixed mechanism. When the moving mechanism undergoes displacement, the spring generates a nonlinear stiffness, and at the same time, the steel balls roll in the spiral grooves of the fixed mechanism. This damper converts the displacement in the vertical direction into the displacement in the torsional direction to achieve the elimination of vibration in the vertical direction. The above embodiments of the present invention can effectively absorb the vibration energy of the oscillator, can be widely used in various vibration environments, have a small mass, a small installation space, and high reliability; and are convenient for installation and maintenance and durable.

[0024] The above has described the embodiments of the present invention in conjunction with the drawings, but the present invention is not limited to the above embodiments, and various changes can also be made according to the purpose of the invention of the present invention. Any changes, modifications, substitutions, combinations, or simplifications made based on the spirit and principle of the technical solution of the present invention shall be equivalent replacement methods, as long as they meet the invention purpose of the present invention and do not deviate from the technical principle and inventive concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A vertical-torsional nonlinear vibration damper, characterized in that It includes a motion mechanism (1), a fixing mechanism (2), a spring (3), and a steel ball (4); the motion mechanism (1) is sleeved outside the fixing mechanism (2), one end of the spring (3) is connected to the motion mechanism (1), and the other end is connected to the fixing mechanism (2). The steel ball (4) is located in the grooves of the motion mechanism (1) and the fixing mechanism (2). When the motion mechanism (1) undergoes displacement, the spring (3) generates non-linear stiffness, and at the same time, the steel ball (4) rolls in the spiral groove of the fixing mechanism (2), and the spiral groove is a spiral upward groove.

2. The vertical-torsional nonlinear vibration damper according to claim 1, wherein The motion mechanism (1) is of a cylindrical structure, and its upper end surface has a spiral protrusion.

3. The vertical-torsional nonlinear vibration damper according to claim 1, wherein The fixing mechanism (2) is of a cylindrical structure, with a spiral upward groove and a conical hole groove engraved on its outer surface for placing the steel ball (4) and the spring (3) respectively.

4. The vertical-torsional nonlinear vibration damper according to claim 1, wherein The steel balls (4) are evenly distributed at equal intervals around the center of the fixing mechanism (2), ensuring the stability of the entire damper during the movement process.

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