Structural and torsional vibration analysis of a dry screw compressor

Willie, James F.; Sachs, R

doi:10.1088/1757-899x/90/1/012005

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…In the work by Willie [1] it was shown that for most screw compressors there is gas that is trapped between the rotors and the discharge axial gap just before the discharge opens and this can lead to over-compression and to gas pulsations in screw compressors. In [2,3,4], other sources of noise inside screw compressors were presented and discussed. In previous work by Hi Bar Blowers the theory behind the development of the SPT technology has been explained [5,6,7,8].…”

Section: Figure 1 Schematic Showing Under and Over-compressionmentioning

confidence: 99%

Use of CFD to optimize the design of a shunt pulsation trap (SPT) used for noise and vibration mitigation in oil free screw compressors

Willie

Yonkers

Huang

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Noise and vibration are problems that are inherent in screw compressors and other Positive Displacement (PD)Machines. This problem is driven partly by the lobe passing frequencies inside these machines that are generated due to the meshing between the gate and main rotors teeth. Because these compressors are operated over a wide speed range and at various loads they usually run at off-design conditions leading to either over or under-compression. In both scenarios, the pressure within the compressor always changes rapidly to match the discharge or process pressure when the discharge opens thus leading to pulsation and noise. To ensure that the compressor is operated without over and or under compression, which also negatively affects the compressor efficiency Hi-Bar Blowers, Inc developed a Shunt Pulsation Trap (SPT) that will contain and reduce the pulsation inside the compressor cavities thus eliminating the use of a silencer at the inlet and the discharge. During the SPT development the CVS Silo King (SKL 1100) compressor was selected for benchmarking this technology. CFD was used extensively to simulate the SKL 1100 without and with the SPT integrated, which allowed the SPT design to be optimized. This paper will present the results obtained to demonstrate that this technology has the potential to eliminate over and under compression while at the same time leading to energy savings and reducing the compressor footprint and the noise and vibration that are commonplace in screw compressors.

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Section: Figure 1 Schematic Showing Under and Over-compressionmentioning

confidence: 99%

Use of CFD to optimize the design of a shunt pulsation trap (SPT) used for noise and vibration mitigation in oil free screw compressors

Willie

Yonkers

Huang

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Metode Holzer digunakan untuk secara akurat memprediksi respons puntir (frekuensi dan defleksi sudut relatif dan amplitudo torsi) [9,10]. Wang, et al [11], melakukan penelitian kebisingan dan getaran dari kompresor sekrup pada kondisi kapasitas berbeda-beda secara eksperimental.…”

Section: Pendahuluanunclassified

“…Menurut Hubel dan Zitek [9] getaran adalah fitur yang sangat khas dari semua kompresor yang menjadi perhatian besar dalam dunia industri. Alasannya adalah sesuatu kejanggalan dalam komponen yang bergerak dapat dideteksi (terutama ketika getaran terjadi pada audio frekuensi) dan masa pakai seluruh mesin.…”

Section: Pendahuluanunclassified

Analisis Getaran pada Screw Compressor Akibat Pengaruh Putaran Rotor

Sangian

Rahman

Rudiwanto

et al. 2020

JRM

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The air compressor engine is becoming a requirement for both large and small industries production machines instead of the drive system of the driven motor becomes pneumatic. In a pneumatic drive system requires certain air pressures are adjusted to the needs of the industry. Compressor engine which widely used is a screw compressor. On the screw compressor, male and female rotors in the air producer are part of the very important because as the primary producer of compressed air from the motor rotation, then the maintenance must be considered regularly, especially vibrations resulting. The study was conducted to test the amount of vibration that occurs on the screw compressor rotor from the rotor rotation variations using vibration measuring devices FFT analyzer. Measurements are made by attaching the accelerometer sensor to the x, y, and z-axis of the compressor screw rotor casing. Three variations rotors are 2557 rpm, 5042 rpm, and 7508 rpm to get a reference to the magnitude of rotation that is best used in the refrigeration machine is reviewed of the amount of vibration produced. From the results of testing and data collection, it can be concluded that vibration is measured using an FFT analyzer of vibration values the highest is at 7508 rpm which is 7.768 Hz and the lowest is at rotation 2557 rpm of 6,442 Hz. Characteristics of screw compressor vibrations in various rotation conditions can be unbalanced due to the emergence of amplitude at 1x rpm it also experiences a misalignment due to generating vibrations which are higher than usual 2x rpm.

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“…6 imposed a method to calculate the various leakage flows and described the effect of leakages on the performance of compressors. James Willie and Sachs 7 investigated the effect of higher-order torsional modes on inter-lobe clearance distribution of the rotors. Temperature distribution and thermal deformation of a twin-screw refrigeration compressor with a working fluid of R134a were simulated by Hsieh et al.…”

Section: Introductionmentioning

confidence: 99%

Minimum clearance technology to improve performance of twin-screw refrigeration compressors by spraying coating on rotors

Sun

Chen

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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During the operating of twin-screw refrigeration compressors, the leakage has a significant influence on the performance of compressors. In this paper, a novel minimum clearance technology that applies the abradable coating to the rotor surface is proposed to lessen the leakage. In order to adapt to the application of the abradable coating, the deformation of rotors during operation is analyzed and a suitable clearance is designed based on the fluid-solid coupling analysis. Then, a suitable coating pre-treated by sandblasting is obtained according to the results of friction coefficient and abradability test. Finally, a prototype is tested and the total efficiency, volumetric efficiency, refrigerating capacity, and COP of the prototype are compared before and after spraying the coating. Test results show that the volumetric efficiency and refrigerating capacity increase significantly after spraying the abradable coating, and the input power decreases slightly. As a result, the COP increases by 6.71% and 7.89% at two nominal operating conditions.

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Structural and torsional vibration analysis of a dry screw compressor

Cited by 5 publications

References 1 publication

Use of CFD to optimize the design of a shunt pulsation trap (SPT) used for noise and vibration mitigation in oil free screw compressors

Use of CFD to optimize the design of a shunt pulsation trap (SPT) used for noise and vibration mitigation in oil free screw compressors

Analisis Getaran pada Screw Compressor Akibat Pengaruh Putaran Rotor

Minimum clearance technology to improve performance of twin-screw refrigeration compressors by spraying coating on rotors

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