Module 2, Pulsations and Other Forces in a Reciprocating Compressor
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- Опубликовано: 27 авг 2024
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Learn about pulsations (or pressure waves) and other forces, including resonance, unbalanced forces and other factors impacting reciprocating compressors; along with ways to mitigate these forces, where they can occur, frequency vs. time-domain analysis, what operating conditions need to be tested, and more. This training video runs about 14 minutes and is the third in a series from Wood's vibration, dynamics and noise team (formerly Beta Machinery Analysis).
For more videos, helpful articles and tools, visit our vibration knowledge center at vdn.woodplc.com.
I am a Engine and Compressor Analyst at ETC. I would like to thank you for the Modules!
Excellent video.
I'm a Cat 3 Vibration Analyst... I always get a little stressed up when I have to analyse a Screw and piston (reciprocating) compressors. There are too many variables. I'm writing a report on an unbalanced piston compressor, it looks bad (the compressor I mean)... And the vibrations of the compressor resonate on the piping, very dangerous, specially because the machine works with NH3
What equipment are you using, what is the cheapest equipment you can use to just check axial vibration on a valve and see its frequency.
Hello can you help me solve a question on theory?
this is gold! thank you sooo much for the video!
Thanks for the feedback, Samir. We're glad you find the video useful!
Please recommend software to analysis of reciprocating pump. Also, Instruments to check the unbalanced forces and vibration in the reciprocating application piping.
Wood has developed our own proprietary software for the analysis of pressure pulsations in reciprocating pumps. We can calculate the amplitude of the pulsation waves and determine the forces and resulting vibration in the piping system and make recommendations to reduce the effects of high vibration. (See more info here: www.betamachinery.com/about/research-and-innovation/#a_289).
Measuring vibration in piping systems can be done with a single-channel data acquisition system, although a two-channel system has advantages in comparing vibration in multiple locations with a reference point. Measuring unbalanced forces is a much more difficult task. Usually, the forces are inferred from the vibration measurement.
Feel free to contact our vibration team at www.woodplc.com/vdn if you'd like to get support for your project.
In the vibration analysis, Do you considered cross head pin force coincidence or cumulative with the unbalanced force and couples of the compressor frame?
Yes, all loads acting on the compressor crosshead, crankshaft and piston are included in the analysis.
@@VibrationDynamicsNoise thank you for the answer.
at 160 Hz the resonance can be found we can see that. but this resonance occurs due to the pulsations. so my question is the resonance occurred in this case should be considered as piping resonance. right?
The simulation results show there is a pulsation resonance at about 160 Hz. The frequency domain solver calculates the resonance at a slightly higher frequency and with much larger amplitude than the time domain solver due to simplifications inherent in the frequency domain solver. The time domain solver is the recommended approach for design pulsation controls for compressor and pump systems.
Are the time domain analysis preformed by using differential equation model of the system and then approach it from there?
Our time domain solver uses the method of characteristics to solve the partial differential equations that describe how pressure and flow disturbances travel in a fluid.