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Study of axial vibration of a Motor-Compressor System Using Operational Modal Analysis

Sound & vibration 2023年第1期57卷 119-131页

作者： M.Farid Yahya Reduan Mat Dan M.Fadzlee Samsubaha Zaini Rashid Azma Putra Engineering Department Malaysia Refining Company(Petronas)Pesiaran PenapisanSungai UdangMelaka76300Malaysia Center for Advance Research on Energy Universiti Teknikal Malaysia MelakaHang Tuah JayaDurian TunggalMelaka76100Malaysia Fakulti Teknologi dan Kejuruteraan Mekanikal Universiti Teknikal Malaysia MelakaHang Tuah JayaDurian TunggalMelaka76100Malaysia

A case study of excessive vibration on a motor-compressor system is presented in this *** barely two months of operation,the reciprocating compressor motor’s routine monitoring revealed excessive axial vibration *** this reason,the Operational Modal Analysis(OMA)was carried out in order to identify the pri-mary *** to the investigation,one of the harmonic components which was 18 times the motor’s running speed matched with a resonance frequency of 112 *** to OMA study,the motor was vibrating in torsional motion because the compressor’s load had stimulated the entire motor-compressor unit at this reso-nance *** analysis also demonstrates the bulging effect of the motor shaft’s axial vibration on the motor’s endplate.

关键词： axial vibration operational modal analysis rotating machinery

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Identification of axial vibration Excitation Source in Vehicle Engine Crankshafts Using an Auto-regressive and Moving Average Model

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1022-1027页

作者： LIANG Xingyu WANG Yuesen SHU Gequn WEI Haiqiao DONG Lihui MEI Yifan State Key Laboratory of Engines Tianjin University Tianjin 300072 China Oil Material Research Institute PLA Genera Logistics Department Beijing 102300 China

Violent axial vibration of a vehicle engine crankshaft might lead to multiple defects to the *** research on mechanism and control measures has been done on engines,such as using the dynamic stiffness matrix method,rayleigh differential method,and system matrix *** the source of axial vibration has not been identified clearly because there are many excitation factors for the axial vibration of a crankshaft,such as coupled torsional-axial vibration and coupled bending-axial vibration,*** order to improve the calculation reliability and identify the excitation source of axial vibration of in vehicle engine crankshafts,this paper presents a method to identify the axial vibration excitation source of crankshafts for high speed diesel engines based on an auto-regressive and moving average（ARMA） *** determining initial moving average variables and measuring axial /bending/torsional vibrations of a crankshaft at the free-end of a 4-cylinder diesel engine,autoregressive spectrum analysis is applied to the measured vibration *** results show that the axial vibration of the crankshaft is mainly excited by coupled bending vibration at high *** at low speed,the axial vibration in some frequencies is excited primarily by torsional *** investigation of axial vibration source of engine crankshafts,calculation accuracy of vibration can be improved significantly.

关键词： automotive engine crankshaft axial vibration excitation source ARMA

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The axial Nonlinear vibration Analysis of Ball-screw about Machine Tool Feeding System

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International Journal of Plant Engineering and Management 2016年第3期21卷 181-192页

作者： ZENG Hao-ran LIU Nian-cong YANG Jia-rui CHEN Jian-long GENG Wei-tao College of Nuclear Technology and Automation Engineering Chengdu University of Technology

The forced state of the ball-screw of machine tool feeding system is analyzed. The ball-screw is simplified as Timoshenko beam and the differential equation of motion for the ball-screw is built. To obtain the axial vibration equation,the differential equation of motion is simplified using the assumed mode method. axial vibration equation is in form of Duffing equation and has the characteristics of nonlinearity. The numerical simulation of Duffing equation is proceeded by MATLAB / Simulink. The effect of screw length,exciting force and damping coefficient are researched,and the axial vibration phase track diagram and Poincare section are obtained. The stability and period of the axial vibration are analyzed. The limit cycle of phase track diagram is enclosed. axial vibration has two type-center singularity distributions on both sides of the origin. The singularity attracts vibration to reach a stable state,and Poincare section shows that axial vibration appears chaotic motion and quasi periodic motion or periodic motion. Singularity position changes with the vibration system parameters,while the distribution doesn’ t change. The period of the vibration is enhanced with increasing frequency and damping coefficient. Test of the feeding system ball-screw axial vibration exists chaos movement. This paper provides a certain theoretical basis for the dynamic characteristic analysis of machine feeding system ball-screw and optimization of structural parameters.

关键词： ball screw Timoshenko beam axial vibration phase diagram Poincare section

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Research on Surface Roughness of Supersonic vibration Auxiliary Side Milling for Titanium Alloy

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 100-111页

作者： Xuetao Wei Caixu Yue Desheng Hu Xianli Liu Yunpeng Ding Steven Y.Liang Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin 150080China Department of Precision Manufacturing Engineering Suzhou Vocational Institute of Industrial TechnologySuzhou 215104China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlanta 30332USA

The processed surface contour shape is extracted with the finite element simulation *** difference value of contour shape change is used as the parameters of balancing surface roughness to construct finite element model of supersonic vibration milling in cutting stability *** surface roughness trial scheme is designed in the orthogonal test design method to analyze the surface roughness test result in the response surface *** surface roughness prediction model is established and ***,the surface roughness finite element simulation prediction model is verified by *** research results show that,compared with the experiment results,the error range of the finite element simulation model is 27.5%–30.9%,and the error range of the empirical model obtained by the response surface method is between 4.4%and 12.3%.So,the model in this paper is accurate and will provide the theoretical basis for the optimization study of the auxiliary milling process of supersonic vibration.

关键词： Side milling axial vibration Ultrasonic milling Finite element simulation Linear regression Surface roughness

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A Method of Evaluating the Effectiveness of a Hydraulic Oscillator in Horizontal Wells

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Sound & vibration 2023年第1期57卷 15-27页

作者： Zhen Zhong Yadong Li Yuxuan Zhao Pengfei Ju Research Institute of Engineering Technology PetroChina Xinjiang Oilfield CompanyKaramayChina

Bent-housing motor is the most widely used directional drilling tool,but it often encounters the problem of high friction when sliding drilling in horizontal *** this paper,a mathematical model is proposed to simulate slide drilling with a friction reduction tool of axial vibration.A term called dynamic effective tractoring force(DETF)is defined and used to evaluate friction reduction *** factors influencing the DETF are studied,and the tool placement optimization problem is *** studyfinds that the drilling rate of penetration(ROP)can lower the DETF but does not change the trend of the DETF *** effectively work,the shock tool stiffness must be greater than some critical *** the case study,the best oscillating frequency is within 15∼20 *** reflection of the vibration at the bit boundary can intensify or weaken the friction reduction effec-tiveness,depending on the distance between the hydraulic oscillator and the *** optimal placement position corresponds to the plateau stage of the DETF *** reliability of the method is verified by thefield *** proposed method can provide a design and use guide to hydraulic oscillators and improve friction reduction effectiveness in horizontal wells.

关键词： Hydraulic oscillator axial vibration friction reduction dynamic effective tractoring force placement optimization

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