Journal articles: 'Compressors – Vibration'

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Zhang, Li, Shuo Zhang, Yuan Yuan Zhang, and Yan Miao Ma. "A Harmonic Response Analysis of Food Refrigeration Compressor Based on Abaqus." Applied Mechanics and Materials 215-216 (November 2012): 950–54. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.950.

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A harmonic response analysis was conducted on semi-hermetic refrigeration compressor by Abaqus software. The vibration displacement and acceleration response spectrums of the compressor’s key points were obtained. The vibration characteristics of the compressor show that the harmonic response analysis result is consistent with the experimental one. The vibration of the compressor at 50Hz is the most dramatic. The first trough in each direction is found around 70Hz, and after that each direction’s acceleration goes up significantly. At the same time, the conclusion verifies the vibration of compressor’s bottom corners by LMS Test. Lab Signature Testing. The paper provides a scientific reference for the further study on vibration and noise reduction in food refrigeration compressors.

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Widodo, Achmad, Satrio Budi Prasojo, and Ismoyo Haryanto. "THE USE OF TWO-DIMENSIONAL AUTOCORRELATION OF VIBRATION SIGNAL FOR FAULT DETECTION OF RECIPROCATING COMPRESSORS." ROTASI 18, no. 1 (January 1, 2016): 18. http://dx.doi.org/10.14710/rotasi.18.1.18-22.

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Reciprocating compressors are the oldest kind of compressors designed for mass production. These compressors still become- the best choice for several industrial application due to their advantages that give high compression ratio and low mass flow. There are many cases of reciprocating compressors faults, such as fault in valve, wrist-pin, and crankpin bore on connecting rod. In this paper, fault detection of such compressors due to exhaust valve and pin bore faults will be presented based on the vibration signal. At first, time domain and frequency domain will be the basic method for analysis and then it will be completed by spectrogram and two-dimensional autocorrelation. The patterns of vibration signals were analyzed and compared through their vibration signatures. Vibration signatures could give informations related to impending faults in the compressors. Therefore, the fault diagnostics of compressor could be realized

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Motriuk, R. W., and D. P. Harvey. "Centrifugal Compressor Modifications and Their Effect on High-Frequency Pipe Wall Vibration." Journal of Pressure Vessel Technology 120, no. 3 (August 1, 1998): 276–82. http://dx.doi.org/10.1115/1.2842058.

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High-frequency pulsation generated by centrifugal compressors, with pressure wavelengths much smaller than the attached pipe diameter, can cause fatigue failures of the compressor internals, impair compressor performance, and damage the attached compressor piping. There are numerous sources producing pulsation in centrifugal compressors. Some of them are discussed in literature at large (Japikse, 1995; Niese, 1976). NGTL has experienced extreme high-frequency discharge pulsation and pipe wall vibration on many of its radial inlet high-flow centrifugal gas compressor facilities. These pulsations led to several piping attachment failures and compressor internal component failures while the compressor operated within the design envelope. This paper considers severe pulsation conditions at an NGTL compression facility which resulted in unacceptable piping vibration. Significant vibration attenuation was achieved by modifying the compressor (pulsation source) through removal of the diffuser vanes and partial removal of the inlet guide vanes (IGV). Direct comparison of the changes in vibration, pulsation, and performance are made for each of the modifications. The vibration problem, probable causes, options available to address the problem, and the results of implementation are reviewed. The effects of diffuser vane removal on discharge pipe wall vibration as well as changes in compressor performance are described.

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KIM, Minkyu, Byoungha Ahn, and Simwon Chin. "Parameter study of Variation noise in outdoor of air conditioner." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 2822–29. http://dx.doi.org/10.3397/in-2021-2238.

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In the outdoor unit of a room air conditioner, the main factors that made it possible to vary the ability of cooling and heating are the development of BLDC motors, advances in inverter technology, and the development of refrigerant volume control technology. The main reason for this change in cooling and heating capacity is that it is possible to change the RPS of compressors. As the range of the compressor's RPS expands, so does the range of response to load variations. This is mainly based on the capacity of the high-pressure refrigerant produced by the compressor. When the compressor rotates at high speed or low speed, the difference in noise occurs depending on the difference in rotational speed. Of course, fans and motors also contribute to noise fluctuations, but the overall governing factor is the greater contribution of refrigerant from compressors and compressors. The refrigerant flows into the cycle configured in the outdoor unit and varies in speed and flow rate depending on the amount of refrigerant. This results in vibration and noise appearing in the form of radiations, resonances, solid sounds, resonances, and so on. There are several factors that can cause vibration or noise changes depending on the flow velocity and flow rate. In this paper, we selected reactance of compressor motors, mufflers directly connected to compressor discharge ports and accumulator at compressor inlet where fluid vibrations occur the most. First of all, reactance of motor responds quickly to load fluctuations and has a large instantaneous torque to instantaneous load fluctuations. The muffler, which is directly connected to the compressor discharge port, is the first Cavity where high-pressure gas meets, and can evaluate the concentration of kinetic energy that generates noise and improve the collection center to reduce fluctuating noise. The Accumulator is the part with the lowest temperature of refrigerant gas entering the compressor, and the rapid change in the flow path causes the most fluid to generate vibration and radiation of the structure. For this reason, we select three elements first. In this paper, we specifically describe the background of selecting three elements of an air conditioning outdoor unit for the variability of noise over RPS changes. We demonstrate that these factors can review the feasibility of the experiment, explain the results of the analysis, and possibility of reduce the variation noise.

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Peng, Sun, Wang Yanrong, and Zhang Xiaobo. "Effects of Airflow Deflection Angle in Diffuser on Forced Response Caused by Impeller-diffuser Interaction in Centrifugal Compressors." MATEC Web of Conferences 179 (2018): 01009. http://dx.doi.org/10.1051/matecconf/201817901009.

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Aeroelasticity has always been a significant issue of compressors. Impeller-diffuser interaction (IDI) produces periodic aerodynamic excitation which forces the blades to vibrate in centrifugal compressors, and eventually causes the damage of blades. Therefore, it is of great importance to investigate the IDI in centrifugal compressors and the effects on the vibration of blades. In this paper, it is discussed in detail that the deflection angle of the airflow in diffuser affects the IDI of the centrifugal compressor and the vibration of blades. The results show that if deflection angle is positive, the interaction of the diffuser on impeller and the vibration of main blades are decreased. However, on condition that the deflection angle is excessive, the interaction of the diffuser on the flow field of impeller will be intensified, and the vibration of the main blades will be stronger. Therefore, it is necessary to reasonably control the range of the deflection angle so that centrifugal compressors are able to work in a safer environment.

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Sha, Yun Dong, Feng Tong Zhao, and Jia Han. "Investigation into Noise Frequency Spectrum Characteristics Corresponding to Blade Nonsynchronous Vibration in Multi-Stage Axial Compressor." Advanced Engineering Forum 2-3 (December 2011): 870–75. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.870.

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Unsteady flow phenomenon occurs in a multi-stage axial compressor. The unsteady flow not only has significant influence on the performance of compressor and the stability of flow, but also can be an excitation source inducing Nonsynchronous vibration (NSV) of rotor blade. NSV is an aeroelastic phenomenon where the rotor blades vibrate at nonintegral multiples of the shaft rotational frequencies in operating regimes where classical ﬂutter is not known to occur. Recently, more and more scholars pay attention to Rotating instabilities (RIs) as one of the unsteady flow phenomenon. RIs have been observed in axial ﬂow fans and centrifugal compressors as well as in low-speed and high-speed axial compressors. They are responsible for the excitation of high amplitude rotor blade vibrations and noise generation. This research aims at revealing the relationships among the unsteady flow behaviors, characteristics of inner sound field and propagation, the vibration of rotor blade in multi-stage axial compressor. The noise in compressor and the vibration of rotor blade have been measured on a high pressure compressor rig testing. The transducer system is connected to the interior casing wall through the acoustic waveguide pipes. The noise is measured by 1/4 inch condenser microphones in different operating of the compressor. The time-domain wave of noise acquired at different work status of the compressor is transformed into frequency spectrum by Fast Fourier Transform (FFT) to investigate characteristics of sound field in multi-stage axial compressor. And the emphasis is focused on the frequency characteristics of the noise corresponding to blade nonsynchronous vibration. It is found that the vibration amplitude of the rotor blade suddenly increases in a pre-arranged structure adjustment and specific rotating speed, and noise signal with special frequency structures appears simultaneously. High amplitude levels of blade vibration have occurred on the first rotor of a multi-stage high pressure compressor. The frequencies are not in resonance with harmonics of the rotor speed. The frequency analysis show that the noise has a special frequency structures with combination of the appeared characteristic frequency and the blade pass frequency of rotor blade (BPF). Because the similarities between the frequency combination and the specific frequency structure of the fluctuating pressure when the rotating instability (RI) appears in the axial compressor have been identified, the acting mechanism of rotating instability may exist in this compressor, i.e. the vibrational excitation to the rotor blade may be aerodynamically caused and associated with a rotating flow instability in the compressor.

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7

Liu, H. I., X. P. Li, and Y. N. Rui. "Monitor On-Line and Fault Diagnosis to High Speed Centrifugal Hydrogen Compressors Based on the Theories of EMD and Correlation Dimension." Applied Mechanics and Materials 33 (October 2010): 523–27. http://dx.doi.org/10.4028/www.scientific.net/amm.33.523.

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High Speed Centrifugal Hydrogen Compressors are big and critical equipments which are widely used in chemical enterprises. It is very important to monitor their condition on-line and diagnose their failure. Based on the research of EMD (empirical mode decomposition) and correlation dimension and experimental simulation, the vibration signals of a High Speed Centrifugal Hydrogen Compressor’s main spindle are collected when working. Then the signals are decomposed by EMD, their correlation dimensions are calculated and taken as fault feature. Finally, using BP algorithm of a neural network in which there are 3 lays, a satisfied effect of fault diagnosis of a High Speed Centrifugal Hydrogen Compressor has been got. The experiment has confirmed that the method is advanced, reliable and practical. A new method is provided for High Speed Centrifugal Hydrogen Compressors’ fault diagnosis.

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Kluczyk, Marcin. "Vibration Characteristics of Reciprocating Air Compressors Used For Hyperbaric Purposes." Polish Hyperbaric Research 52, no. 3 (September 1, 2015): 17–25. http://dx.doi.org/10.1515/phr-2015-0013.

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Abstract The article presents problems related to the diagnostics of vibrations in reciprocating compressors driven by motors of less than 100 kW. None of the currently applicable norms concerning the issues of vibration diagnostics broach this subject, and therefore diagnosticians have no reference levels for measured vibration parameters. The present paper focuses on two types of compressors intended for diving purposes and hyperbaric techniques. The paper contains a suggested course of actions at the time of taking measurements. Further suggestions for developing coherent procedures as regards the diagnostics of reciprocating compressors of less than 100 kW have been indicated.

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Wang, Wei Min, and Wei Zheng An. "Investigation on the Subsynchronous Vibration Fault Diagnosis and Control for Centrifugal Compressor." Applied Mechanics and Materials 34-35 (October 2010): 1488–92. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1488.

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Centrifugal compressors are widely used to compressor gas in many different processes within the petroleum and chemical industry. Two vibration types of concern in industrial compressors are synchronous and subsynchronous vibration. The latter, more troubling type of vibration, occurs when non-conservative whirling forces(Cross-coupling) act to excite a lateral natural frequency, which lies below the running speed(subsynchronous vibration). In this paper, more attention is paid to impellers from a rotordynamic standpoint and a synthesis gas compress in ammonia plant is analyzed in order to diagnosis the root cause of vibration fault using the best available resources for seals and bearing. Logarithmic decrement predictions for the full rotor model consisting of all the stages and seals are conducted under different bearing structure. On this basis, a resolvent to improve the rotordynamic stability is presented. The field application result indicates that this method is effective.

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Zhou, Ying Ming, Zhi Min Song, Hai Feng Zhao, and Shu Yun Mi. "Vibration Fault Analysis in Screw Compressor and Foundation." Applied Mechanics and Materials 166-169 (May 2012): 1072–75. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1072.

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With the characteristics of low noise, low vibration, high reliability and long life, Screw Compressor is the indispensable main equipment which widely used in petrochemical field. The abnormal vibration of Compressor will affect normal operation of the host, lead to damage of some main parts such as Compressor and motor and at the same time it’s an unneglectable hidden trouble for equipment’s safe operation. This article takes the data acquisition of vibration and the analyses of shake for two Ammonia Refrigeration Piston Compressors, and study at the reason about shock then take the effective shockproof treatment plan. All these ensure the stable running of the facility.

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Baba, Toshiaki, Koumei Fujioka, Hirotoshi Arihara, Yoshitaka Baba, and Takuya Iwata. "EXPERIMENTAL EVALUATION OF PERFORMANCE AND MECHANICAL RELIABILITY FOR HIGH PRESSURE CO2 INTEGRALLY GEARED COMPRESSOR." Journal of the Global Power and Propulsion Society 4 (August 20, 2020): 128–44. http://dx.doi.org/10.33737/jgpps/124724.

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Energy saving has become a trend as well as a countermeasure for global environmental issues. It can be one of the efficient solutions for reducing energy consumptions by adopting integrally geared compressors instead of inline compressors for industrial plants. The development of key technologies for the design centrifugal compressor such as CFD, FEM, Rotor dynamic Analysis has enabled integrally geared centrifugal compressors for higher pressure applications than ever. A commercial size, 5 stages integrally geared CO2 centrifugal compressor of 20MPaG discharge pressure level was designed, manufactured and evaluated the fluid dynamic performances and rotor stability. It was installed in OEM’s factory and the full load and full pressure test was carried out using real CO2 gas. The actual compressor fluid dynamic performance has shown superior results even at high pressure supercritical gas conditions at the high pressure stages of the compressor. The mechanical performances such as rotor vibration and bearing temperature were also measured and observed that the vibration was substantially low and within safe limits even at high pressure operating conditions above 20MPaG. Also the authors established a novel on Direct Rotor Excitation Method to experimentally investigate the rotor stability even at a high operating pressure level of 20MPaG. With this technique the measurements of the actual rotor natural frequencies and the damping ratios (log decrement) during high pressure operating conditions provided more precise results rather than conventional casing excitation method. The open impeller blade vibration was measured during running condition by using a non-contact blade vibration measurement technique. This measurement results revealed that impeller blades stress against the centrifugal force and the external excitation force was very low compared to the allowable stress value of the impeller material. The fluid dynamic characteristics and mechanical reliability are assessed as acceptable including super critical gas condition of CO2 gas.

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Li, Caoyang, David Herrin, John Baker, and Asad M. Sardar. "Simulation of rubber grommets and correlation with test at low frequencies." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5740–47. http://dx.doi.org/10.3397/in-2021-3246.

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Residential air conditioning units include several sources which can lead to vibrational and noise issues. The most important structure-borne source is the compressor which controls the noise and vibration in certain frequency ranges. Compressors are mounted on four relatively stiff rubber grommets which partially isolate the basepan from the compressor motion while also ensuring that the compressor does not move too much. In this work, the grommets are simulated using the finite element method and results are correlated with measurement results with good agreement. It is demonstrated that the hyperelastic properties of the grommets should be increased due to the Payne effect to improve correlation.

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13

Kacani, V. "Vibration analysis in reciprocating compressors." IOP Conference Series: Materials Science and Engineering 232 (August 2017): 012016. http://dx.doi.org/10.1088/1757-899x/232/1/012016.

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Shi, Hui, Wenku Shi, Liang Sun, and Zhiyong Chen. "Improving Camper Comfort by Optimizing the Vibration Isolation of Air-Conditioning Compressor." Mathematical Problems in Engineering 2020 (December 23, 2020): 1–14. http://dx.doi.org/10.1155/2020/2958604.

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Compressors are the main excitation source of vibration and noise in camper air-conditioning systems, which directly affects the NVH characteristics in campers. The vibration and noise reduction for camper comfort improvement can be implemented by the optimization method. This paper presents vibration and noise improvement in camper by systematically optimizing the vibration isolation performance of air-conditioning compressor. To analyze the compressor vibration characteristics, operational vibration tests under different conditions and modal identification are implemented. Based on the analysis results, a genetic algorithm is used to optimize the stiffness of the compressor vibration isolation element by the energy decoupling method (EDM). The stiffness, natural frequencies, and energy decoupling rate (EDR) of the compressor vibration isolation system (CVIS) are compared between preoptimization and postoptimization. The stiffness and strength characteristics of the optimized isolation system are verified by the finite element method. Operational vibration and noise tests of a camper are performed to validate the optimization effect. The improvement of camper comfort demonstrates that the proposed optimization procedure of CVIS is effective.

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Li, Shuangshuang, Liwen Zhang, and Chunyan Kong. "Vibration Failure Analysis and Countermeasures of the Inlet Pipelines at a Gas Compressor Station." Shock and Vibration 2019 (November 6, 2019): 1–8. http://dx.doi.org/10.1155/2019/6032962.

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A gas compressor station only had its about 35% design processing capacity as a result of the abnormal piping vibrations on the inlet pipelines. Characterization, diagnostics, analysis, and elimination of piping vibration were performed. The root causes and sources of the abnormal vibration were investigated by on-site measurements and analysis of vibration and pulsation under various load conditions of compressors. The results revealed that it was not mechanical resonance, but the high pressure pulsation and acoustic resonance occurred on the inlet pipelines, which resulted in the severe vibration. Three different modification models against vibration were proposed by shortening the length of the pipe to avoid acoustic resonance, enlarging the volume of the gathering manifold to buffer pressure pulsation, and adding supports to increase the stiffness. A better modification model was applied by performing modal analysis and fluid-structure interaction (FSI) vibration analysis using the finite element method. The effect of countermeasures was evaluated by vibration and pulsation measurements during operation after modifications, which results showed the level of piping vibration and pressure pulsation was within the allowable limits. The processing capacity of the gas station has reached its design requirement as a result of the desired reduction in vibrations.

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Li, Chang Zheng, and Yong Lei. "Compressor Surge Detection Based on Support Vector Data Description." Applied Mechanics and Materials 152-154 (January 2012): 1545–49. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1545.

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Axial flow compressors work as an indispensable device in industry fields. Surge is a phenomenon of aerodynamic instability, which characterized by disruption of flow. When a compressor works in surge state, the vibration is so intense that it may causes accidents. Detecting surge timely and accurately not only insure safety of compressors but also is a key of active control of aerodynamic instability. Support vector data description (SVDD) is a one-class classification method developed based on the theory of support vector machine (SVM). In this paper, we introduce SVDD into the field of compressor surge detection. It demonstrates that SVDD method can give a warning far ahead of surge.

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Sheng, Xiao Ming, Xue Wu Hu, and Yang Yang. "Piston Air Compressor Based on Symmetrical Double-Crank Link Mechanism." Applied Mechanics and Materials 433-435 (October 2013): 2184–87. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.2184.

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Machine vibration, noise and cylinder barrel wearing are produced when ordinary piston air compressor driven by crank link mechanism is working. Piston air compressor driven by double-crank link mechanism is proposed in this paper to eliminate these problems. Secondary pressurized double-acting air compressor and two-stage double-acting air compressor based on symmetrical double-crank link mechanism are designed in this paper to increase air compressors output pressure and flow rate and to achieve output control of low pressure high flow and high pressure low flow. It can remove effects generated by lateral force, reduce the vibration and noise and the wearing of cylinder barrel, and improve the steadiness and the service life of the air compressor.

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Zhou, Xin Xiang, Cheng Liu, and Gang Yu Hu. "Achieve the WWD-0.8/10 Air Compressor's Motion Simulation." Applied Mechanics and Materials 494-495 (February 2014): 124–27. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.124.

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When observing the WWD-0.8/10 air compressor that was noiseless and oilless, its vibration and noise were large. These phenomena were related to air compressors reciprocating inertial force and overturning moment which were separately depended on pistons acceleration and forces of connecting rod. Movement mechanisms three-dimensional solid model establishment, virtual assembly and motion simulation were accomplished by Pro/E. The main procedures were introduced in the paper. Many important metrical data obtained about pistons acceleration and forces of connecting rod by motion simulation could supply necessary references for air compressors dynamic optimizations.

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Liu, Jing Hua, and Gui Chuan Hu. "The Study of Vibration for Motor-Compressors." Applied Mechanics and Materials 467 (December 2013): 479–82. http://dx.doi.org/10.4028/www.scientific.net/amm.467.479.

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According to the motor-compressors vibration problems occur in the process of operation, research the working principle of the unit, the incentive vibration element, establishes the physical model of the vibration excitation source. it is a guiding significance for the dynamic design, reform system, monitoring and operation management of the motor-compressors.

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Liu, Jing Hua, and Gui Chuan Hu. "The Study on Vibration for Integral Reciprocating Compressors." Advanced Materials Research 871 (December 2013): 115–18. http://dx.doi.org/10.4028/www.scientific.net/amr.871.115.

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According to the integrate reciprocating compressors vibration problems occur in the process of operation, research the working principle of the unit, the incentive vibration element, establishes the physical model of the vibration excitation source. it is a guiding significance for the dynamic design, reform system, monitoring and operation management of the integrate reciprocating compressors.

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Wang, Jiang Ping, and Teng Fei Duan. "Fault Diagnosis with Mult-Signal Test for Reciprocating Compressor." Applied Mechanics and Materials 741 (March 2015): 294–97. http://dx.doi.org/10.4028/www.scientific.net/amm.741.294.

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High frequency vibration signal, cylinder-inside pressure and ultrasonic wave are monitored under working condition of a reciprocating compressor. High frequency vibration signal and ultrasonic wave are processed using high frequency band-pass filtering, and then enveloped. The pressure signal is filtered with a low-pass digital filter. The fault causes of the machine can be determined by the enveloped waveform of vibration signal and ultrasonic wave, as well as the pressure curve comprehensively. We can confirm the truth that this fault diagnosis method is accurate and reliable for reciprocating compressors through a number of the results of fault diagnosis.

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Veprik, A. M., V. I. Babitsky, N. Pundak, and S. V. Riabzev. "Vibration Control of Linear Split Stirling Cryogenic Cooler for Airborne Infrared Application." Shock and Vibration 7, no. 6 (2000): 363–79. http://dx.doi.org/10.1155/2000/962193.

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Modern infrared imagers often rely on the split Stirling cryogenic coolers the linear compressors of which are the well-known sources of harmonic disturbance. The traditional method of their passive isolation fails to meet the restraints on the static and dynamic deflections which are originated by the combined action of the airborne g-loading and harsh random vibration.The vibration protection system, which combines a stiff and heavily damped vibration isolator with tuned dynamic absorber, is studied and optimised for use in the design of an airborne infrared device.Such a design is aimed, primarily, at essential dynamic suppression of the harmonic force which is produced by the linear compressor and, secondarily, at minimisation of environmental vibration loads transmitted through the infrared device to the linear compressor. Experimental testing backed up the theoretical results.

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Matsushita, Osami, Youichi Kanemitsu, Takao Azuma, and Yasuo Fukushima. "Vibration Criteria Considered from Case Studies of Active Magnetic Bearing Equipped Rotating Machines." International Journal of Rotating Machinery 6, no. 1 (2000): 67–78. http://dx.doi.org/10.1155/s1023621x00000075.

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The main part of turbo machinery is conventionally supported by oil film lubricated bearings. The rotor vibrations can be suppressed within low levels as to satisfy vibration criteria, e.g., ISO standards for general rotors and API 617 for process compressors. Recently, the sophisticated advantages of the active magnetic bearing (AMB) have been increasing the number of applications to industrial rotors. The AMB vibration control design requires the weak support which induces inevitably large vibration amplitude, though it is normal for AMB itself. Vibration criteria indicated by present standards are thus too strict for AMB equipped rotors. The difference of the bearing dynamic characteristics between the oil film lubricated bearing and the AMB compels us to prepare a new ISO standard which recommends the acceptance of higher vibration levels for AMB operation.In this paper, a case study was executed concerning AMB equipped LP and HP compressors experiencing long-term operation with no major trouble since December, 1992. The rotating rated speed, 10900 rpm, is beyond the first bending critical speed with 5300 kW of power. The average value of the rotor vibration was about 50 μmpp in the site operation. By reviewing the rotor design concept and field data of these AMB equipped machines, new vibration criteria are considered for a proposal of ISO standardization.

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Zhong, Mei Peng, Ju Long Yuan, Wei Feng Yao, and Xiang Chi. "Researcher on Manufacturing Surface of Air Compressor Cylinder by Vibration and Mechanism of Lubrication." Advanced Materials Research 842 (November 2013): 643–46. http://dx.doi.org/10.4028/www.scientific.net/amr.842.643.

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The method of the impacting to manufacture micro-pits is put forward in order to reduce friction between Piston ring and Cylinder liner, and improve the effective of air compressor. Method and principium of the impacting to manufacture micro-pits is recounted. The cylinder liner is set on principal axis of the rotating lathe. The tool can feed toward axis or radial direction. The micro-pits deepness is controlled by axis feeding, and distance between two micro-pits is controlled by radial feeding. The motor drives eccentricity wheel, so that the tool engender the low frequency vibration. The micro-pits are manufactured by the tools on low-frequency vibration. The effective of micro-pits processing is improved because the matrix tools were designed and manufactured. The depth of micro-pits can be controlled, so that it is even. The dynamic lubrication is built up between the cylinder and the piston, because the distributing regulation and the structural parameter can be controlled, and the micro-pits distribute evenly and independently. A theoretic model was presented to study the lubrication performance, The theory of dynamic lubrication of the honeycomb micro-pits was researched. The air compressor cylinder liners were manufactured. The tests of air compressors which cylinder liners have no micro-pits and air compressors which cylinder liners have micro-pits were done. The test result proves that friction between Piston ring and Cylinder liner is reduced, and the effective of air compressor is improved because of micro-pits.

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Li, Chuan Wu, and Xian Yan Wang. "Analysis of the Electrically Driven Compressor for New Energy Vehicles." Advanced Materials Research 1049-1050 (October 2014): 553–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.553.

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The new energy electric bus has already been used for many years; however, it is also not strange that there are problems in the actual operation process. Base on the running status of new energy vehicles during the early stage, this article provides some opinions on problems of using electrically driven compressor, which is mainly stated oil carryover and vibration noise of several kinds of electrically driven compressor and enumerated the partial performance of the compressors. After all, the behavior of compressor will not only directly affect the braking safety performance, but also had a greater influence on the Sequential maintenance costs.

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Degtyareva, T. S., and G. S. Surkov. "The Implementation and Comparison of Calculation Methods of Natural Torsional Vibrations for Reciprocating Compressors." Proceedings of Higher Educational Institutions. Маchine Building, no. 11 (716) (November 2019): 19–25. http://dx.doi.org/10.18698/0536-1044-2019-11-19-25.

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The problem of torsional vibrations is relevant for reciprocating compressors due to the occurrence of alternating torques that create additional torsional stresses during operation. Such vibrations are particularly dangerous in resonance frequencies when the first natural vibration frequency coincides with the harmonic component of the lower order of forced vibrations. This article analyzes the methods described in the literature for calculating natural torsional frequencies of crankshafts of multirow reciprocating compressors. Recommendations are given on selecting an appropriate calculation method at various design stages. The analytical dependencies that describe three various methods are presented: the iterative method based on moments equation, the method of continued fractions (Tersky’s method) and the matrix method. The stages of calculation are described analytically, and the calculation results are compared. The developed computational software is presented.

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ISHI, Noriaki, Hiroshi MATSUNAGA, Michio YAMAMURA, Shigeru MURAMATSU, and Masafumi FUKUSHIMA. "Flow-Induced Vibration of Reed Valve in Refrigerant Compressors. Vibration Criterion." Transactions of the Japan Society of Mechanical Engineers Series C 57, no. 538 (1991): 1828–33. http://dx.doi.org/10.1299/kikaic.57.1828.

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Liu, Yang, Lixiang Duan, Zhuang Yuan, Ning Wang, and Jianping Zhao. "An Intelligent Fault Diagnosis Method for Reciprocating Compressors Based on LMD and SDAE." Sensors 19, no. 5 (February 28, 2019): 1041. http://dx.doi.org/10.3390/s19051041.

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The effective fault diagnosis in the prognostic and health management of reciprocating compressors has been a research hotspot for a long time. The vibration signal of reciprocating compressors is nonlinear and non-stationary. However, the traditional methods applied to processing such signals have three issues, including separating the useful frequency bands from overlapped signals, extracting fault features with strong subjectivity, and processing the massive data with limited learning abilities. To address the above issues, this paper, which is based on the idea of deep learning, proposed an intelligent fault diagnosis method combining Local Mean Decomposition (LMD) and the Stack Denoising Autoencoder (SDAE). The vibration signal is firstly decomposed by LMD and reconstructed based on the cross-correlation criterion. The virtual noise channel is constructed to reduce the noise of the vibration signal. Then, the de-noised signal is input into the trained SDAE model to learn the fault features adaptively. Finally, the conditions of the reciprocating compressor valve are classified by the proposed method. The results show that classification accuracy is 92.72% under the condition of a low signal-noise ratio, which is 5 percentage points higher than that of the traditional methods. This shows the effectiveness and robustness of the proposed method.

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Long, Jiang Qi, Si Jia Zhou, and Ping Yu. "Experimental Investigation of Vibration and Noise Control of Reciprocating Compressors." Advanced Materials Research 443-444 (January 2012): 837–42. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.837.

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The reciprocating compressor contains crank-rod mechanism whose unbalanced inertia force mainly accounts for mechanical noise and vibration during the working process. Through the analysis of fit between the diameter of the compressor piston and the crank eccentricity, influence of imbalance force on the compressor vibration and noise is obtained under no change in other parts. The tests of vibration and noise are followed for the purpose of verification. The results show that the vibration and noise control will be better if a small piston diameter and a big crank eccentricity are utilized.

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J. m. Tahir, Shivan, and Erhan AKIN. "Predictive Maintenance of Compressor Using ThingSpeak IoT Platform." International Journal of Scientific Research and Management 9, no. 06 (June 28, 2021): 604–10. http://dx.doi.org/10.18535/ijsrm/v9i06.ec01.

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Any instrument or machine that needs to be monitored and inspected on a regular basis to ensure its long life and proper maintenance. Machine condition monitoring in the time and frequency domain is unquestionably required to ensure reliability. Condition monitoring is a method of observing a machine's condition parameter (vibration, temperature and etc.), with the explicit objective of detecting a substantial change that could indicate the onset of a malfunction It's an important part of compressor predictive maintenance and lowering compressor downtime. In today's world, the Internet of Things (IoT) is the most effective approach and technology for continuously monitoring the state of any machine. We've employed MEMS sensors to detect misalignment, non-linearity, and other anomalies., Through the Wi-Fi module ESP8266, vibrations and temperature in compressors, as well as changes in signals, will be communicated to the cloud. These signals are in order in the temporal domain. The Fast Fourier transform is used to examine and convert the time domain sequence into the frequency domain.

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Lee, S., C. Bai, and J. Shim. "Performance analysis and experiment of new 3D rotary compressor." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 1 (September 27, 2011): 133–44. http://dx.doi.org/10.1177/0954406211413519.

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R410A is one of the HFC refrigerants, which are preferred globally to promote the most environmentally friendly option on the basis of an objective reference system taking into account the alternative selection of HCFC refrigerants for the air-conditioning system by the Kyoto protocol. This article presents a three-dimensional (3D) rotary compressor that is within the family of rotary compressors. First, the geometry of the compressor is explained and equations relating the volume of the compression and suction chambers to the rotational angle of the shaft are derived. These equations are used within a model that predicts the mass flow rate, power consumption, and cooling capacity of the compressor. The model includes energy and mass balances within the compression chambers, as well as the estimation of leakage, frictional, and electrical losses. The primary sources of energy and flow losses are identified for this type of compressor. The results presented were generated using refrigerant R410A as the working fluid based on the properties of the ‘Ref-prop 7.0’ program provided by NIST. Due to the two compression chambers vertically separated in one cylinder, this 3D rotary compressor has the best vibration characteristic and the smallest torque variation among the conventional-type compressors.

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Rens, J., R. E. Clark, and D. Howe. "Vibration analysis and control of reciprocating air-compressors." International Journal of Applied Electromagnetics and Mechanics 15, no. 1-4 (December 21, 2002): 155–62. http://dx.doi.org/10.3233/jae-2002-448.

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MIZOBE, Yu, Yoshifumi MORI, Katsuhide FUJITA, and Takashi SAITO. "Study of accelerated vibration model of reciprocating compressors." Proceedings of the Symposium on Evaluation and Diagnosis 2016.15 (2016): 103. http://dx.doi.org/10.1299/jsmesed.2016.15.103.

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Shaykhatarov, Insaf Faisovich, and Rinat Ravilevich Zalyaev. "MONITORING AND RATIONING VIBRATION OF DYNAMIC EQUIPMENT AT A CHEMICAL PLANT." EurasianUnionScientists 2, no. 6(75) (July 21, 2020): 49–52. http://dx.doi.org/10.31618/esu.2413-9335.2020.2.75.828.

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The article is devoted to the questions of normalization of vibration parameters at vibration diagnostics of dynamic equipment (compressors, pumps) by the example of large chemical enterprise. The analysis of normative and technical documentation is carried out, vibration assessment criteria are considered.

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Wang, Yuefang, Sujing Wang, and Lihua Huang. "Random Vibration Analysis for Impellers of Centrifugal Compressors Through the Pseudo-Excitation Method." International Journal of Computational Methods 12, no. 04 (August 2015): 1540002. http://dx.doi.org/10.1142/s0219876215400022.

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Impellers of centrifugal compressors are generally loaded by fluctuating aerodynamic pressure in operations. Excessive vibration of the impellers can be induced by unsteady airflows and lead to severe fatigue failures. Traditional transient stress analyses implemented in time domain generally require multiple load-step, very time-consuming computations using input of temporal pneumatic force previously obtained from Computational fluid dynamics (CFD) analyses. For quick evaluation of structural integrity of impellers, it is necessary to develop random vibration models and solution approaches defined in frequency domain. In this paper, the Pseudo-Excitation Method (PEM) is used to obtain power spectral density of three-dimensional, dynamic displacement and stress of impellers. A finite element model of an unshrouded impeller of a centrifugal compressor is generated based on the result of unsteady CFD analysis. Compared with the direct transient stress analyses in time domain, the pseudo-excitation method provides accurate and fast estimation of dynamic response of the impeller, making it an applicable and efficient method for analyzing random vibration of impellers.

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Gelin, A., J. M. Pugnet, D. Bolusset, and P. Friez. "Experience in Full-Load Testing of Natural Gas Centrifugal Compressors for Rotordynamics Improvements." Journal of Engineering for Gas Turbines and Power 119, no. 4 (October 1, 1997): 934–41. http://dx.doi.org/10.1115/1.2817077.

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During full-load shop tests under natural gas, two multistage centrifugal compressors exhibited subsynchronous vibrations. Both of them are low-flow, high-pressure, high rotational speed compressors, and are fitted with tilting pad bearings and dry gas seals. A rotating stall problem was first eliminated by a modification of the diffuser geometry. Then, aerodynamic excitations caused the rotors to operate at their stability limit, and high vibration levels were observed at the first natural frequency. A complete rotordynamics analysis was performed in order to model precisely all the fluid–structure interactions. Modifications of the rotor designs were implemented, consisting in optimizing conveniently the bearing pads, replacing the toothed labyrinth seals of the balance pistons by damping honeycomb seals, fitting them with improved shunt hole systems. In addition, the dry gas seals were found to have been damaged, due to thermal effects, and further modifications were implemented to eliminate this problem. Final full load tests demonstrated a satisfactory behavior of both centrifugal compressors.

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Dhurvey, Akanksha. "Transmissibility Analysis of a Regenerated Rotor System." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 1102–7. http://dx.doi.org/10.22214/ijraset.2021.37542.

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Abstract: The aim of this paper is to represents a dynamic behavior of rotor bearing system wirth simply supported beam for three different position disc. rotating machinery such as compressors, turbines, pumps, jet engines, turtobo chargers, etc. are subject to vibrations. rotating machines are operated in very high speed and they are subjected to some unbalance force due to vibration from that machine pass to the foundation of machine.so the analysis of the dynamics parameter of rotor it is important to determine force transmissibility, natural frequency, critical speed and amplitudes of rotor system. Keywords: force transmissibility, vibration, critical speed, rotor bearing system etc.

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Choy, F. K., J. Padovan, and Y. F. Ruan. "Coupling of Rotor-Gear-Casing Vibrations During Extreme Operating Events." Journal of Pressure Vessel Technology 114, no. 4 (November 1, 1992): 464–71. http://dx.doi.org/10.1115/1.2929256.

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During extreme operating environments (i.e., seismic events, base motion-induced vibrations, etc.), the coupled vibrations developed between the rotors, bearings, gears and enclosing structure of gear-driven rotating equipment can be quite substantial. Generally, such large vibrational amplitudes may lead to failures in both the rotor-gearing system and/or the casing structure. This paper simulates the dynamic behavior of rotor-bearing-gear system resulting from motion of the enclosed structure. The modal synthesis approach is used in this study to synthesize the dynamics of the rotor systems with the vibrations of their casing structure in modal coordinates. Modal characteristics of the rotor-bearing-gear systems are evaluated using the matrix transfer technique, while the modal parameters for the casing structure are developed through a finite element model using NASTRAN. The modal accelerations calculated are integrated through a numerical algorithm to generate modal transient vibration analysis. Vibration results are examined in both time and frequency domains to develop representations for the coupled dynamics generated during extreme operating conditions. Typical three-rotor bull gear-driven power plant equipment (compressors, pumps, etc.) is used as an example to demonstrate the procedure developed.

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Brandstetter, Christoph, and Sina Stapelfeldt. "Analysis of a Linear Model for Non-Synchronous Vibrations Near Stall." International Journal of Turbomachinery, Propulsion and Power 6, no. 3 (July 9, 2021): 26. http://dx.doi.org/10.3390/ijtpp6030026.

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Non-synchronous vibrations arising near the stall boundary of compressors are a recurring and potentially safety-critical problem in modern aero-engines. Recent numerical and experimental investigations have shown that these vibrations are caused by the lock-in of circumferentially convected aerodynamic disturbances and structural vibration modes, and that it is possible to predict unstable vibration modes using coupled linear models. This paper aims to further investigate non-synchronous vibrations by casting a reduced model for NSV in the frequency domain and analysing stability for a range of parameters. It is shown how, and why, under certain conditions linear models are able to capture a phenomenon, which has traditionally been associated with aerodynamic non-linearities. The formulation clearly highlights the differences between convective non-synchronous vibrations and flutter and identifies the modifications necessary to make quantitative predictions.

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Vahdati, Mehdi, Fanzhou Zhao, and Prathiban Sureshkumar. "AN OVERVIEW OF TIME-DOMAIN COMPUTATIONAL METHODS FOR AEROELASTIC INSTABILITIES OF MULTI-STAGE COMPRESSOR." Journal of the Global Power and Propulsion Society 4 (July 30, 2020): 114–27. http://dx.doi.org/10.33737/jgpps/123916.

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Modern gas turbine design continues to move towards improved performance, reduced weight and reduced cost. As turbomachinery blade aerofoils are thinned to improve performance and reduce weight, aeroelastic issues such as flutter, forced response and stall driven vibrations become more predominant. Moreover, as the use of blisks (blade-integrated-disks) with very low mechanical damping becomes more common in modern compressor designs, accurate prediction of compressor aeroelastic stability in a multi-row environment becomes vital. This paper presents a review of aeroelasticity research carried out at Rolls-Royce Vibration University Technology Centre (VUTC) at Imperial College over the past 20 years. The aim is to summarise the unusual aeroelastic issues observed in multi-stage compressors into one document so that it can be used by other researchers in the field. Blade passing forced response is not addressed here as their existence can be detected by a Campbell diagram. The results presented here are based on numerical methods but where possible data from experiments are used to verify the numerical findings.

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Cui, Michael M. "Comparative Study of Unsteady Flows in a Transonic Centrifugal Compressor with Vaneless and Vaned Diffusers." International Journal of Rotating Machinery 2005, no. 1 (2005): 90–103. http://dx.doi.org/10.1155/ijrm.2005.90.

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To reduce vibration and noise level, the impeller and diffuser blade numbers inside an industrial compressor are typically chosen without common divisors. The shapes of volutes or collectors in these compressors are also not axis-symmetric. When impeller blades pass these asymmetric structures, the flow field in the compressor is time-dependent and three-dimensional. To obtain a fundamental physical understanding of these three-dimensional unsteady flow fields and assess their impact on the compressor performance, the flow field inside the compressors needs to be studied as a whole to include asymmetric and unsteady interaction between the compressor components. In the current study, a unified three-dimensional numerical model was built for a transonic centrifugal compressor including impeller, diffusers, and volute. HFC 134a was used as the working fluid. The thermodynamic and transport properties of the refrigerant gas were modeled by the Martin-Hou equation of state and power laws, respectively. The three-dimensional unsteady flow field was simulated with a Navier-Stokes solver using thek−εturbulent model. The overall performance parameters are obtained by integrating the field quantities. Both the unsteady flow field and the overall performance are analyzed comparatively for each component. The compressor was tested in a water chiller system instrumented to obtain both the overall performance data and local flow-field quantities. The experimental and numerical results agree well. The correlation between the overall compressor performance and local flow-field quantities is defined. The methodology developed and data obtained in these studies can be applied to the centrifugal compressor design and optimization.

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Kolodziej, Jason R., and John N. Trout. "An image-based pattern recognition approach to condition monitoring of reciprocating compressor valves." Journal of Vibration and Control 24, no. 19 (September 7, 2017): 4433–48. http://dx.doi.org/10.1177/1077546317726453.

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This work presents the development of a vibration-based condition monitoring method for early detection and classification of valve wear within industrial reciprocating compressors through the combined use of time-frequency analysis with image-based pattern recognition techniques. Two common valve related fault conditions are spring fatigue and valve seat wear and are seeded on the crank-side discharge valves of a Dresser-Rand ESH-1 industrial compressor. Operational data including vibration, cylinder pressure, and crank shaft position are collected and processed using a transformed time-frequency domain approach. The results are processed as images with features extracted using 1st and 2nd order image texture statistics and binary shape properties. Feature reduction is accomplished by principal component analysis and a Bayesian classification strategy is employed with accuracy rates greater than 90%.

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Spakovszky, Z. S., J. D. Paduano, R. Larsonneur, A. Traxler, and M. M. Bright. "Tip Clearance Actuation With Magnetic Bearings for High-Speed Compressor Stall Control." Journal of Turbomachinery 123, no. 3 (February 1, 2000): 464–72. http://dx.doi.org/10.1115/1.1370163.

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Magnetic bearings are widely used as active suspension devices in rotating machinery, mainly for active vibration control purposes. The concept of active tip-clearance control suggests a new application of magnetic bearings as servo-actuators to stabilize rotating stall in axial compressors. This paper presents a first-of-a-kind feasibility study of an active stall control experiment with a magnetic bearing servo-actuator in the NASA Glenn high-speed single-stage compressor test facility. Together with CFD and experimental data a two-dimensional, incompressible compressor stability model was used in a stochastic estimation and control analysis to determine the required magnetic bearing performance for compressor stall control. The resulting requirements introduced new challenges to the magnetic bearing actuator design. A magnetic bearing servo-actuator was designed that fulfilled the performance specifications. Control laws were then developed to stabilize the compressor shaft. In a second control loop, a constant gain controller was implemented to stabilize rotating stall. A detailed closed loop simulation at 100 percent corrected design speed resulted in a 2.3 percent reduction of stalling mass flow, which is comparable to results obtained in the same compressor by Weigl et al. (1998. ASME J. Turbomach. 120, 625–636) using unsteady air injection. The design and simulation results presented here establish the viability of magnetic bearings for stall control in aero-engine high-speed compressors. Furthermore, the paper outlines a general design procedure to develop magnetic bearing servo-actuators for high-speed turbomachinery.

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Зіньковський, Анатолій Павлович, Вячеслав Михайлович Меркулов, Олег Леонідович Деркач, Іван Гордійович Токар, and Кирило Валентинович Савченко. "Дослідження напруженого стану міжпазових виступів диска робочого колеса компресора з урахуванням впливу відцентрових сил та розладу частот коливань лопаток." Aerospace technic and technology, no. 4sup1 (August 27, 2021): 47–54. http://dx.doi.org/10.32620/aktt.2021.4sup1.07.

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The authors present the results of the numerical experiments on the determination of the effect of compressor blade mistuning on the stress state of a blade-disk joint under the action of the centrifugal forces and their comparison with results of full-scale experiments. The analysis of the results of the previously performed experimental and numerical experiments on the determination of the possible sources of blade-disk joints failure shows their stress state strongly depends on the disk rim thickness and the blade vibration mode and their mistuning. It indicates the need for further studies to determine the causes of cracks and possible fracture of blade-disk joints in the compressor of a gas-turbine engine. The task is solved in the variation of the dovetail-rim region thickness of the disk of the 1st stage of the low-pressure compressor of the gas-turbine engine D-36, which has blades without shrouds. The finite element models of the blade assembly, are used to perform the investigation. Obtained results of the vibration stress analysis of blade-disk joints in the compressor both modifications under the action of the centrifugal forces have good agreement with the data of full-scale experiments and numerical data using rod models. The presented results of the numerical experiments indicate the possibility of reducing vibration stresses by analyzing and choosing parameters that affect the rigidity of the coupling of the blades, which is of practical importance for increasing the vibration reliability of the compressors of gas-turbine engines.

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MORI, Yoshifumi, Takenori NAKAMURA, Katsuhide FUJITA, and Takashi SAITO. "Verification of the reciprocating compressors monitoring using vibration models." Proceedings of the Dynamics & Design Conference 2016 (2016): 344. http://dx.doi.org/10.1299/jsmedmc.2016.344.

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Huang, Z., W. Jiang, H. Zhang, C. Liu, H. Jin, Y. Zhou, and J. He. "An effective experimental method for identifying radiated noise of different angular ranges for the rolling-piston compressor." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 12 (December 1, 2008): 2409–17. http://dx.doi.org/10.1243/09544062jmes1077.

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In the traditional analysis method of noise signals, it is very difficult to relate the overall noise from compressors to the angular position. The experimental method of separating the overall noise of different angular ranges is carried out at the real conditions. The starting position of the rotary piston is labelled with vane displacement and the test signals are synchronously sampled. Experimental results are analysed through fast Fourier transform method based on different angular ranges, which displays the following useful conclusions. The experiment technology could effectively identify the angular ranges for the frequency bands with prominent noise level; for the experimental rolling-piston compressor, the vibration, and sound pressure level of the discharge process (210–360 angular degrees) are the largest above the frequency 500 Hz. The discharge process is divided into three parts, where the final part contributes a little to the overall noise level when compared with the other two stages. Pressure pulsation is an important source of vibration and noise and its suppression of peak frequencies is the key of low-noise design of the compressor.

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El-Kafrawy, A. E., A. Kandil, and A. Omar. "Vibration isolation of a symmetric and asymmetric rigid bar using struts subject to axial static and dynamic excitation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 2 (June 23, 2010): 334–46. http://dx.doi.org/10.1243/09544062jmes2125.

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Many developed modern machineries such as compressors, engines, and presses represent a serious source of undesirable, uncomfortable, and uncontrollable vibrations leading to harmful failure and loss of machine availability. Therefore, research of mechanical engineers in maintenance sections in the industry has been devoted to the control, isolation, and minimi-zation of harmful effects of such vibrations. The objective of the present paper is to study the influence of using a specific type of vibration isolator based on using post-buckled elastic clamped—clamped struts as an effective solution tool to relieve vibrating machines from these harmful effects. A model that consists of post-buckled struts acting as vibration isolators used to support symmetric and asymmetric rigid bars is introduced. The proposed clamped—clamped struts are subject to axial harmonic excitation at the base. The isolated bar is allowed to displace laterally. Displacement transmissibility is selected as the governing optimization variable of the isolator's effectiveness with the main objective to minimize vibrations transmitted from the base to the rigid bar. The transmissibility is calculated over a wide range of frequencies and plotted in the form of design charts to determine its effect on the vibration behaviour of struts. The lateral motion of the bar is considered. These plots are used to recognize the range of frequencies, for which full isolation is maintained. The frequencies at which resonance occurs in the system can then be depicted from the design graphs. The study reveals that at resonance frequencies, the most effective transmissibility is well below unity. Vibration characteristics are determined at specific frequencies, such that the physical performance of the vibrating system can be studied. All variables used in the analysis are normalized, such that the results are not dependent on any geometric of material property, such as the modulus of elasticity of the material, the section modulus of the profile used, or the length of the strut. In this way, the obtained results can be applied over a wide range of elastic materials, regardless of the type of material or section properties.

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Zhang, Mingming, Shurong Hao, and Anping Hou. "Study on the Intelligent Modeling of the Blade Aerodynamic Force in Compressors Based on Machine Learning." Mathematics 9, no. 5 (February 25, 2021): 476. http://dx.doi.org/10.3390/math9050476.

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In order to obtain the aerodynamic loads of the vibrating blades efficiently, the eXterme Gradient Boosting (XGBoost) algorithm in machine learning was adopted to establish a three-dimensional unsteady aerodynamic force reduction model. First, the database for the unsteady aerodynamic response during the blade vibration was acquired through the numerical simulation of flow field. Then the obtained data set was trained by the XGBoost algorithm to set up the intelligent model of unsteady aerodynamic force for the three-dimensional blade. Afterwards, the aerodynamic load could be gained at any spatial location during blade vibration. To evaluate and verify the reliability of the intelligent model for the blade aerodynamic load, the prediction results of the machine learning model were compared with the results of Computation Fluid Dynamics (CFD). The determination coefficient R2 and the Root Mean Square Error (RMSE) were introduced as the model evaluation indicators. The results show that the prediction results based on the machine learning model are in good agreement with the CFD results, and the calculation efficiency is significantly improved. The results also indicate that the aerodynamic intelligent model based on the machine learning method is worthy of further study in evaluating the blade vibration stability.

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Potočnik, Primož, and Edvard Govekar. "Semi-supervised vibration-based classification and condition monitoring of compressors." Mechanical Systems and Signal Processing 93 (September 2017): 51–65. http://dx.doi.org/10.1016/j.ymssp.2017.01.048.

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Wu, Y., T. Mulder, C. H. Vermeer, H. J. Holland, B. Benthem, and H. J. M. ter Brake. "Vibration-free Cooler for the METIS Instrument Using Sorption Compressors." Physics Procedia 67 (2015): 411–16. http://dx.doi.org/10.1016/j.phpro.2015.06.050.

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Journal articles on the topic 'Compressors – Vibration'

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