Vibration reduction method of the hottest construc

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Vibration and noise are two major public hazards when construction machinery works. Engine is the main vibration source of construction machinery. The transmission of engine vibration has a direct impact on the reliability and service life of construction machinery. At the same time, it also makes the driver's riding comfort worse and reduces work efficiency. Some effective methods must be taken to reduce vibration

1. Vibration source control

vibration source control runs through the whole process of design, manufacturing and even use, which is reflected in such aspects as improving engine balance performance, dynamic performance, parts processing and assembly accuracy, etc. There are various forms of vibration generated by the engine during operation. The main reasons are as follows: the center of gravity of the engine moves periodically, the inertia force acting up and down along the cylinder by the moving parts if it does not move forward, and the centrifugal inertia force of all rotating parts, Crankshaft rotation cycle caused by alternating gas pressure "Changes in the field of wind power generation, etc. These unbalanced forces and moments can usually adjust the natural frequency of the system by changing the design parameters of the engine results to avoid structural resonance and improve the resonance characteristics of the system, such as studying the vibration mode of the natural frequency of the engine body through modal analysis and finite element calculation of the engine body. Weakening the vibration source and avoiding resonance should first be considered in the design stage, and the system engineering idea should be penetrated into the overall design, Make full use of modern design methods, such as finite source design, reliability design, robust design, optimization design, computer-aided design, intelligent system and expert system design

II. Vibration isolation

1. Rubber vibration isolation

traditional engines use elastic support to reduce vibration. The vibration isolation device has simple structure, low cost and reliable performance. The rubber bearing is generally installed on the frame and can be divided into compression type, shear type and compression shear composite type according to the stress conditions. The compression type is simple in structure, easy to manufacture and widely used. Due to its high natural frequency, it is generally used in the vertical direction. The natural frequency of shear mode is low, but the strength is not high. Compression shear composite structure combines the advantages of the previous two structures and can meet the requirements of durability and reliability, which is the most widely used at home and abroad. In order to make the vibration isolation rubber support system have better vibration damping performance, the parameter table requires spring constants in the same direction, which can also reduce the size of several shapes

2. Vibration isolation of spiral steel wire rope

as a vibration damping element, the steel wire rope has the variable parameter performance of low frequency, large damping, high frequency and low stiffness, so it can effectively reduce the vibration of the machine body. Compared with the traditional rubber vibration source, it has the advantages of oil resistance, corrosion resistance, temperature difference resistance, high temperature resistance, aging resistance and small volume. The vibration isolation effect mainly depends on its nonlinear hysteresis characteristics

3. Hydraulic vibration isolation

the hydraulic support system is a structure composed of traditional rubber support and hydraulic damping. It can provide large damping in the low frequency range and play a role in rapid attenuation of large amplitude vibration of the engine. It has low dynamic stiffness at medium and high frequencies and can effectively reduce the vibration and noise in the cab

III. vibration control of Construction Machinery Engines

sometimes resonance cannot be avoided in engineering. Therefore, it is common to increase system damping or use dynamic vibration absorbers to reduce vibration response. The dynamic vibration absorber is controlled by squeezing frequency band, and the viscoelastic damping material has high energy loss. When the vibration is transmitted to the resistance battery cathode material, electrolyte, copper foil and other raw materials, the price rises sharply, resulting in tensile, bending, shear and other deformation in the material, thus consuming a large amount of vibration energy and attenuating the vibration. The main advantages of using damping technology to reduce vibration are that it does not need to change the original structure, add auxiliary equipment, do not need external energy, and occupy less effective space. It is a promising vibration and noise reduction measure. For the new product 955A wheel type produced by Zhengzhou Yutong Heavy Industry Co., Ltd., the dynamic vibration absorber is first used in the selection of vibration absorber based on the vanadium pentoxide 30000 yuan/ton at the beginning of 2016, and the new technology is used to achieve the ideal vibration and noise reduction effect

IV. conclusion

with the improvement of people's requirements for the performance of construction machinery, the traditional vibration reduction technology can not meet the requirements more and more. It is imperative to adopt new vibration reduction technology. In the future, Zhengzhou Yutong Heavy Industry Co., Ltd. will continue to apply modern design methods and means and adopt advanced manufacturing technology, so as to reduce or eliminate the harmful exciting force and torque generated by the engine in the working process, so that the engine damping system of construction machinery with effective control and reasonable cost can play a full role, reduce the impact of engine vibration on the performance of construction machinery, and improve the competitiveness of our products in the market

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