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Improved passive damping equipment

A technology for vibration damping equipment and equipment, applied in drilling equipment, drilling equipment and methods, impact drilling, etc., can solve the problems of reducing the amount of vibration damping, increasing rigidity, increasing cost and weight, etc.

Active Publication Date: 2020-09-04
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most active damping mechanisms add significantly to cost and weight, and can affect the overall performance of the tools that incorporate them
[0008] Unfortunately, most traditional passive damping systems (especially hand-held tools) that use traditional springs or dampers do not dampen vibrations because (1) the worker needs to press down to hold the machine securely for high operating efficiency; and (2) as a conventional spring or material is compressed more, its stiffness increases significantly, and thus the amount of vibration dampening provided decreases significantly

Method used

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example

[0250] Based on a simple optimization to minimize the weighted transmissibility in the critical range, the following damping device with initial parameter settings is proposed:

[0251] L 1 =100mm,L 2 =200mm, m 1 =10kg , M 2 =20kg, θ=π / 4 , K=100N / mm, D=0.01 and the elongated member material is structural steel.

[0252] In order to optimize the parameters of this device, the following parameters were selected:

[0253] L 1 =100mm,L 2 =200mm, m 1 =15kg , M 2 =20kg, θ=π / 6 , K=100N / mm, D=0.1 and the elongated member material is aluminum alloy.

[0254] The results are shown in Figure 5 , the figure indicates a comparison of the jerk profile between the improved or optimized design and the original design.

[0255] It can be seen that all the resonant frequencies (first frequency is 3 Hz) and peak values ​​using the optimized parameter settings are smaller than those of the original ones (first frequency is 6 Hz) and peak values.

[0256] This is especially tru...

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Abstract

In an aspect of the disclosure there is provided a vibration reducing apparatus for a percussive tool having an axis of reciprocation. The apparatus comprises, a guide frame and at least one member extending across the axis of reciprocation. An assembly extending in a direction of along the axis of reciprocation comprises at least two layers and each layer comprises four interconnected elongate members pivotally attached and rotatable with respect to each other to define a polygon; and the assembly has at least one biasing means. A handle is movably coupled to the guide frame and supported on the assembly. The apparatus provides decreasing stiffness with increasing compression of the assembly under an applied load to the handle for reducing vibration in a predetermined frequency range.

Description

technical field [0001] The present disclosure relates to an improved passive vibration damping device and system particularly suited for damping vibrations emanating from reciprocating tools. Background technique [0002] Vibration is a type of oscillation characterized by finitely small oscillations in a system in a near-equilibrium state. In most engineering aspects, mechanical vibration is considered a negative factor that needs to be controlled because it affects mechanical properties, increases fatigue and wear, and may even cause structural damage. [0003] Vibrations transmitted to construction workers from the operation of various power tools such as rammers, rock drills, picks, pavement breakers, impact drills, chisel hammers or saws are an area where vibration can have a direct and serious health impact on operators of power tools . It is known in the art that humans perceive vibration frequencies ranging from 1 to 1000 Hz, with humans being most sensitive to vib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B1/00
CPCB25D17/043B25D2217/0073B25D2250/371
Inventor 景兴建
Owner THE HONG KONG POLYTECHNIC UNIV