Applying API and NEMA Specifications to Limit Electrical Current Pulsation and Torsional Vibration of Synchronous Motors Driving Reciprocating Compressors

Feese, Troy; Fanslow, Mark

doi:10.1109/pcic30934.2019.9074533

Cited by 2 publications

(5 citation statements)

References 3 publications

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“…In mechanical drives, there is often excessive torsional oscillation caused mainly by reciprocating machines such as combustion engines and compressors, where by constant speed of shaft the transmitted torque is periodic [15][16][17]. But even in drive systems with electric motors, excessive torsional oscillations can occur, especially during transient conditions such as start-up and braking [16,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…One of the most common and easiest ways to deal with problems associated with torsional vibration is to use a suitable flexible shaft coupling [15,21]. In addition to the transmission of the torque itself, flexible shaft couplings not only enable smaller misalignments of the connected shafts but mainly dampen torsional shocks and can reduce the amplitude of torsional oscillations [1,21].…”

Section: Introductionmentioning

confidence: 99%

“…By a suitable flexible coupling, we mean a coupling with suitable mechanical properties. From the point of view of the transmission of periodic torque, the most important mechanical property of the coupling is its torsional stiffness [15,16,22]. Torsional stiffness of coupling is a parameter that affects the value of the natural frequency of the whole mechanical system.…”

Section: Introductionmentioning

confidence: 99%

“…With such elements, over time, the mechanical system becomes "out of tune". For the sake of completeness, it is necessary to mention that tuning can be achieved not only by changing the torsional stiffness but also by changing the damping or mass moments of inertia and also by using additional devices as dampers, absorbers, and eliminators of torsional vibration [1,2,15,27]. However, all these methods achieve the tuning of the mechanical system for specific operating conditions (or range of operating conditions) by setting the mechanical parameters (stiffness, damping, mass-moment of inertia) in advance during the design process, provided that these parameters then remain unchanged.…”

Section: Introductionmentioning

confidence: 99%

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Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

Kaššay,

Grega,

Urbanský

et al. 2023

Machines

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Presently, mechanical system vibroisolation is becoming increasingly important. One of the new approaches is semi-active vibroisolation using elements capable of changing a selected mechanical property. These include, among others, pneumatic flexible shaft couplings capable of changing torsional stiffness during operation. The main goal of the article is to examine the potential advantages of a newly patented pneumatic coupling over a current type with the same pneumatic element arrangement. For comparison, parameters determinable from static load characteristics were selected. These parameters are maximum twist angle and torque, average torsional stiffness, and the percentage of torque transmitted by the bellows rubber shell. In all cases, the new coupling had better properties. Since the prototype of the new coupling has not yet been produced, its parameters were determined from its mathematical-physical model. The article contains a full procedure to obtain the static load characteristic of a new coupling type, beginning with the determination of air bellows force/height and volume/height characteristics, then optimum sizes of coupling with regards to the operating range of elements, the dependency of element height on the coupling’s twist angle, and finally the computation of the static load characteristic considering isothermal gas compression. The presented procedure can be applied to any pneumatic bellows where the force/height characteristics of different pressures are given.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

Kaššay,

Grega,

Urbanský

et al. 2023

Machines

View full text Add to dashboard Cite

show abstract

“…If unexpected resonant torsional vibrations are detected, they cannot usually be feasibly mitigated by modifying the excitation frequencies. Controlling the excitation frequencies is difficult, since they are usually inherently produced by the machine operation [4]. However, their magnitude can be reduced in some cases by introducing additional damping.…”

Section: Introductionmentioning

confidence: 99%

Method for Adjusting Torsional Natural Frequencies of Powertrains with Novel Coupling Design

et al. 2022

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Torsional vibrations are inherently present in every rotating powertrain. In resonant conditions, torsional vibrations can be significantly amplified. A typical method to reduce the torsional vibration particularly at resonance is to modify the torsional natural frequencies with the component design. Commonly, a straightforward method for the modification is the adjustment of the torsional stiffness of a coupling. This study presents a method to modify the torsional natural frequencies using a coupling design with continuously adjustable torsional stiffness. The presented coupling design is investigated with torsional analysis and experimental measurements. Torsional analysis was utilized to predict the effects of varying the coupling stiffness to the torsional natural frequencies of a powertrain. The experimental measurements were conducted by attaching the adjustable stiffness coupling to the powertrain and measuring the change in the torsional natural frequencies while the torsional stiffness of the coupling was adjusted. The torsional natural frequencies were determined from the measurements by identifying the resonance induced torsional vibrations from the vibration response of the powertrain. The torsional vibrations were excited to the system by a load motor. The measurements showed that the first torsional natural frequency of the powertrain changed from 15.6 Hz to 43.0 Hz as the torsional stiffness of the coupling was adjusted. The results of the torsional analysis and the experimental measurements were compared to determine the performance of the realized coupling. The results indicated that the torsional natural frequencies determined by torsional analysis agree well with the experimentally measured results. The prediction errors were generally below ±5%, which is typically considered as a margin for accurate torsional analysis.

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Applying API and NEMA Specifications to Limit Electrical Current Pulsation and Torsional Vibration of Synchronous Motors Driving Reciprocating Compressors

Cited by 2 publications

References 3 publications

Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

Novel Design of Variable Stiffness Pneumatic Flexible Shaft Coupling: Determining the Mathematical-Physical Model and Potential Benefits

Method for Adjusting Torsional Natural Frequencies of Powertrains with Novel Coupling Design

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