Content area
Full Text
Journal of Mechanical Science and Technology 26 (12) (2012) 3903~3909
www.springerlink.com/content/1738'494x
DOI 10.1007/s12206'012'0891'8
Vibration analysis of compressor piping system with fluid pulsation
Seong'Hyeon Lee, Sang'Mo Ryu and Weui'Bong Jeong*
School of Mechanical Engineering, Pusan National University, 30 Jangeon dong, Geumjeong gu, Seoul, 609 735, Korea (Manuscript Received December 10, 2011; Revised July 31, 2012; Accepted August 14, 2012)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Abstract
A piping system connected to a rotary compressor is an essential component for refrigerant transport in air'conditioning systems. The vibration of the pipes has been thought to be generated only by the mechanical forces due to the compressor operation. In this study, the fluid pulsation in the pipe is considered to be a source of the vibration, as well as the mechanical forces by the compressor operation. The mechanical force was first identified experimentally using measured acceleration signals over the shell. The calculation of the fluid force resulting from the pulsating fluid in the pipe was then derived theoretically. The estimation used the pressure pulsation signal in the pipe measured by a pressure transducer. Both sources of the vibration were finally applied to the finite element model of the piping system. Conclusively, the prediction of the vibration response to both sources showed better agreement with the experimental results than predic' tion considering only the mechanical force. Therefore the theoretical process deriving the fluid force was valid.
Keywords: Fluid pulsation; Force identification; Piping system; Rotary compressor; Vibration
1. Introduction
The compressor is an important part of an air'conditioning system. A piping system is attached to the compressor to carry the refrigerant. The design of the shape of the pipes is a diffi' cult problem for the designer because pipe vibrations of the pipe are not easy to predict at the design stage. When severe vibrations occur in prototype pipe models, damping materials are often used instead of changing the shape of the pipe. A study to predict the vibrations of the pipes attached to a com' pressor is therefore necessary at the design stage.
Yanagisawa et al. [1] studied the vibrations of a rolling' piston'type rotary compressor for air'conditioners and sug' gested a simple method for predicting the vibration under different operating conditions. Etemad and Nieter [2] dis' cussed the basic theory of the scroll'compressor concept...