The non-lubricated four-stage compressor which can compress up to 24.52 1\.fPa has been developed This newly developed compressor has high durability and efficiency in comparison with conventional non-lubricated compressors. For the purpose of improving durability, new technologies are adopted in this development. The plunger piston without piston rings is applied at the high pressure stages wh...

The oscillation of a rotary compressor was measured and analyzed in the frequency time domains. harmonic wavelet transform used to dissolve signal into series single-frequency components. A power spectrum analysis components shows that there are many vibration whose frequencies one, double, triple, quadruple, even tens times rotating frequency. An envelope some originate from friction-excited c...

Smooth plant production is utmost expected by owners since any unplanned shutdown very much undesirable as it may incur loss of company’s profits and other repercussions. Critical operational assets such rotating machineries their components, e.g., motor, pump, compressor, turbines are crucial to be monitored in ensuring continuous operation the plant. Therefore, vibration being one elements pr...

High-purity germanium (HPGe) is a vibration-sensitive, high-resolution detector. It has been found that microphonic noise induced by vibration and electromagnetic interference from EMC causes energy resolution degradation in HPGe detectors. In this paper, to enhance the of pulse tube-cooled high purity detector, passive isolation system for portable tube cooler (PTC) was employed investigated. ...

Vibration monitoring is an important practice throughout regular operation of gas turbine power systems and, even more so, during characterization tests. Vibration monitoring relies on accurate and reliable sensor readings. To obtain accurate readings, sensors are placed such that the signal is maximized. In the case of characterization tests, strain gauges are placed at the location of vibrati...

In the present paper a study of the time dependent transonic flow field around a single compressor blade in a Laval nozzle is presented. For the investigation the PIV method has been employed because of its ability to deliver instantaneous flow field information across an illuminated plane with high spatial and temporal resolution. From these instantaneous PIV measurements the mean velocity fie...

Connecting rod is a crucial part of the reciprocating compressor and the crankpin bearing fault of connecting rod is always the obstacle in fault diagnosis. Normally the condition monitoring of connecting rod and dynamic analysis are based on cylinder dynamic pressure monitoring which is also an important method for fault diagnosis. However, it is hard to diagnose crankpin bearing fault in real...

The efficiency of the valved linear compressor is very important to space J-T throttling refrigerator. To compare single-piston (SVLC) and symmetrical dual-piston (SDVLC), this paper explores factors that affect efficiency. Firstly, analyzes mechanical vibration system compressor, result shows highest when external force (current) in phase with speed. Then numerical solutions current velocity a...

The development and application of a software package for the design of twin screw compressors is presented in this paper. The package can be used to calculate the rotor profile, geometrical characteristics, thermodynamic performance, forces on rotor, rotor deflection and cutter shape. A user-friendly interface and some powerful post-processing programs are also included in the package. The app...