The impact of the power frequency on the performance of a scroll compressor was investigated. Two representative frequencies, 50 and 60 Hz, were used to quantify the effects of the power frequency on the scroll compressor performance characteristics for the same design. The major physical mechanisms responsible for the scroll compressor performance were identified. The changes induced by the po...

In the Omega EP laser, the pulse must be stretched in time, amplified, and subsequently compressed in a grating compressor in order to obtain high peak power. A model was used to characterize the temporally resolved near-field and far-field beam distributions for several different compressor configurations that included grating alignment errors and grating surface figure errors. The spatio-temp...

Field testing of compressor packages driven by gas turbines or electric motors requires the accurate determination of efficiency, flow, head, and power in sometimes less than ideal working environments. This paper discusses field performance testing of centrifugal compressors and measurement uncertainties one can expect when following appropriate test guidelines. The primary focus is on compres...

In this paper we develop linear, fixed-order (i.e., fulland reduced-order) pressure rise feedback dynamic compensators for axial flow compressors. Unlike the nonlinear static controllers proposed in the literature possessing gain at all frequencies, the proposed dynamic compensators explicitly account for compressor performance versus sensor accuracy, compressor performance versus processor thr...

The scroll compressor, using R41 OA that has higher density and works at higher pressure than R22, is required to redesign its geometry such as wrap profile. The design parameters of wrap profile such as base circle radius, wrap height, involute end angle and discharge port have to be well determined to obtain high compressor efficiency. At first, a simulation program has been developed to pred...

Cyclic vibratory torque requirement of a Reciprocating Compressor sets in torsional vibrations in compressor motor system. Explanation of development of pulsating currents, due to vibratory motion of motor rotor is given. The pulsating currents are superimposed on steady state currents. Mathematical mod~ls for analysing torsional vibrations of the system and nett motor current due to combinatio...

According IS01217 standard and metheds of performance test for general dis-placement air compressor of China, a m1crocomputor measurement and control system for performent test of compressor has been set up. All the test can be carried out without manual interference,it has been real1zed collecting and treating data automatically.Using some hardward and softward ~teps,the accurary and repetitio...

This paper presents enhancement in the speed performance of Conventional Wallace tree multiplier by reducing the partial products. Wallace tree multiplier is fabricated using 90nm CMOS technology. In this particular work, we have used 3:2 compressor, 4:2 compressor, 5:2 compressor and carry propagate adder (CPA) to reduce the partial products of conventional Wallace tree multiplier and in compr...

The Linac Coherent Light Source (LCLS) is a SASE xray Free-Electron Laser (FEL) project presently under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam has recently been completed. The second phase of construction, including second bunch...

A mathematical model of a reciprocating compressor is used in conjunction with a "Complex" method of optimisation to determine the "best" dimensions of a single-stage compressor to meet a prescribed duty. The mathematical procedures provide the basic compressor and valve dimensions by optimising an objective function based, in this instance, on criteria of thermodynamic performance. The conseqe...