Application of Damping Vibration Damping on Boat Air Compressor 1. Naval Station in Shenyang, Ship Supporting Military Defence Room, Shenyang Shenyang 01422 Shenyang Blower Group Co., Ltd., Shenyang 1124, Liaoning, for parameter optimization and structural optimization The largest noise reduction effect is achieved on the marine air compressor.
The noise vibration of an electric high-pressure air compressor for a certain type of boat is too large to meet the requirements of the new boat. For this reason, it is necessary to reduce vibration and noise. By applying the reciprocating inertial force balance mechanism, the helical gear oil pump is used to reduce the vibration noise by measures such as impedance reduction and high precision.
After the improvement, the vibration of the shrinking machine and the squeaking index have been greatly reduced, reaching the requirements of the new boat. However, the total acceleration of the compressor's foot acceleration is small, failing to meet the requirements of the new boat. For the vibration reduction of the air compressor, the ratio of the dynamic stiffness to the two can be used. At this time, the dynamic stiffness is not a simple constant value, but a complex value. Therefore, the superscript is added to the star to distinguish it, and it is recorded as =1. In order to determine the energy of the above-mentioned structure under the action of dynamic force, the work of the structure can be calculated and the elastic deformation of the structure can be the noise reduction of the seed. The law has been tried to reduce the radical measures. It has basically tried all over and failed to achieve the expected results. Therefore, we can only start from the passive noise reduction, that is, reduce the response of the stimulated system, and solve the total acceleration of the foot. Wen Muwen tries to dampen the structure on the public squat of the jade shrinking machine, and adopts both the free damping structure and the constrained damping structure. Measures to reduce the air. The machine's foot acceleration level has achieved good efficiency.
2 Model establishment and analysis 2.1 Damping energy analysis and mathematical description For any engineering structure, after the dynamic force plant 6, it will generate dynamic displacement. If the engineering structure is purely elastic, but after considering the damping, dynamic The force and dynamic displacement response can no longer maintain the same phase, but the dynamic displacement lags behind the excitation force. If the lag angle is set, the application of the mathematical formula is as follows. In order to make the job and the evaluation have the same dimension, the energy consumed is measured in units of radians, and the physical essence of the damping energy can be obtained in engineering. The ratio of the energy lost in the structural system to its elastic deformation energy, and is defined as the damping loss factor. For a mechanical system consisting of one component, the vibration energy consumption of a single vibrating component can be determined according to formula 7. In a mechanical system, if a component consumes energy in vibration, the total structural loss factor of the entire mechanical system! 1 is Equation 9 is the relationship between the damping and energy consumption of any complex structure, that is, the structural loss factor is used as the structural feature of the damping seat. It can be determined that the loss of the constrained damping structure is determined by the free damping structure. The structural characteristics of the common base of the press are adopted as a mounting structure with a freely damped outer portion as a constrained damping. The free damping material is made of self-adhesive damping material and the exterior is made of rubber. According to the structural characteristics of the common base, it can be converted into a beam structure. Therefore, it can be determined that the relationship between the loss factor of the free damping structure 1 and other parameters is thickness, and the ratio e=Ej damping layer Young's modulus and basic elastic layer Yang The modulus of the private ratio P damping layer material loss factor type 1 and the basic elastic layer constraint layer and the damping layer material 7 degree parameter. It is called the time parameter as reference. 2 Y is related to the Young's modulus thickness of each layer of material in the constrained damping structure. It is called the stiffness parameter. Refer to the 20 damper coffin, the loss flop. 1. Basic elastic layer 2. Damping layer 3. Constraining layer and the material thickness of the basic elastic layer and the constraining layer and the material of the damping layer material are all determined, so 7 is a function of the thickness of the damping layer, so it is also possible to determine the optimum Damping layer thickness.
Equation 10 The loss factor of the free damping structure is both a function of the damping layer thickness ratio and a function of the damping layer modulus ratio 6, and is linear with the damping factor of the damping layer itself.
It said to call the mouth. When the hunger is big. The value can increase with the increase of people until it has practical significance. Therefore, the damping material chosen should have a large Young's modulus. When the value is 6, the ice value rises monotonically with the value and has a limit value to determine the optimum damping layer thickness.
2.3 Constrained Damping Structure Analysis After the layer 2 is attached to the plexus layer, the layer of elastic layer is firmly adhered to the upper part of the damping layer, which is called the constraining layer. When the basic elastic layer generates bending vibration, the upper and lower sides of the damping layer respectively generate different deformations of compression and stretching, so that the damping layer is subjected to the shearing and strain, thereby dissipating the vibration energy of the structure. The constrained damping structure can consume more energy than the free damping structure and has better damping effect. ,1! . According to the public bottom 3 test verification, the best self-mountain damping layer and the thickness of the constrained damping layer are confirmed according to the above analysis, and the modified common base is tested.
The test results show that the acceleration value of the foot of the public base seven vibration maximum point after the change is reduced by 41. The total vibration level of the machine foot is reduced by 2. The internal vibration and noise indicators of the air compressor meet the requirements of the new boat. The application of damping damping has achieved good results. 4 Conclusions Under the circumstance that the active airborne denoising of boats is becoming more and more difficult.
The use of damped passive noise reduction is a relatively simple and economical approach.
By establishing a physical mathematical model between damping and various related factors, and aiming at the indicators closely related to engineering applications, parameter optimization and structural optimization can achieve good results in noise control of marine air compressors. of.
Discussion on the use of maintenance on the buffer volume value of reciprocating compressors Wenzhou Qiangsheng Petrochemical Machinery Co., Ltd., 3250 lines in Wenzhou, Zhejiang, strives to achieve the ultimate goal of satisfactory compressor performance and longevity.
As is known, as a reciprocating compressor, the process of suction and exhaust is discontinuous. Therefore, there is a fixed pulsation value. This pulsation affects the normal operation and life of the compressor valve and the vibration of the unit. Usually, an air suction damper is provided to solve the harmful factors caused by the pulsation.
From the existing standard specifications, there are no less than 45 methods to determine the size of its buffer volume. Common sense tells us that the larger the volume, the better the effect of reducing the flow pulsation, but the maximum should have a reasonable limit, which should take into account the factors such as the cost of manufacturing space.
In the 1618 standard and the human 1 specification, although the same from the hands of a society, but because different units skid mounted or not give different 2006 touch gas design standards, there are 7.213 buffer tanks should be set before the compressor, natural gas in The buffer tank stay time should not be less than 108. However, in the 850156 2002 automotive refueling station design and construction standards, only in the annual edition.
The specification of the buffer tank should be set before the compressor, and the volume value is not clear. In the 91 Ting 3413 2004 Petrochemical Reciprocating Compressor Engineering Technical Regulations 〉 standard, the design, manufacture and inspection of the buffer tank, in addition to the provisions of 618, also stipulate that the volume of the buffer tank should be at least for all connected cylinders. 12 times the displacement of the piston. In 08 Ding 203222006, the reciprocating compressor for the oil and natural gas industry passed the 130 standard conversion, and the standard came to I1 Dai Depei. Damping vibration reduction and noise reduction technology. Xi'an Xi'an Jiaotong University Press, in 1986, there is a method for determining the volume value of the suction and exhaust damper for the reciprocating compressor for the oil and gas industry. Although it is the initial selection, it may still have to be calculated separately after the unit system calculation. The improvement can be finally determined. Only the flow value of 3 and the piston displacement of 12 times are used to determine the volume of the buffer tank. At best, it can only be estimated that the foreign matter settlement has an effect.
The piston displacement and discharge volume are not defined as terms in the above standards, and it is inconvenient to understand. Only the terminology standard is defined. As for the terminology of the terminology, in the design stage of the piping system of the reciprocating compressor unit, the calculation of the non-resonant tube length and the cylinder joint flange and the buffer line side force and the rated power of the cylinder are different. The calculation method, sometimes taking into account the forced mechanical response of the compressor, after trial and error and optimization calculations, to achieve satisfactory results. However, in order to ensure that the final analysis works properly and on a cost-effective basis, it is practically impossible to reach the ideal design, 1618 terminology.
The location and configuration of the bumper is also very high. If it is stated, it is not enough to have a large volume of buffer tank before the inlet of the card reducer.
If the length of the connecting tube between them is in the vicinity of the length of the connecting tube that causes resonance, it will inevitably have unintended consequences.
2 Dai Pei Pei. Engineering of Damping Technology 4. Beiji Zhanhua Daling Publishing, 3rd, Hiroshi Hiroshi. Anti-vibration 5 and its application
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