this paper presents a new arc starter circuit that is usable in manual metal arc welding (mma) power supplies. the proposed circuit uses an auxiliary circuit and a series coupling transformer for adding high frequency spikes to output dc voltage during arc striking. the proposed circuit is usable in inverter based arc welding supplies and it could result in a decrease of weigh, volume and expen...

In this paper, the novel approach for the rotating machine as diagnosis method in detecting the faults during its operation was proposed based upon the infrared thermograph technique. As experimental works, by performing the test of operation at several lubrication conditions for the ball bearing applied in the rotating machine which there has been used broadly, diagnosis evaluation and fault a...

In the present investigation we have studied the peristaltic flow of a couple stress fluid in a non-uniform rectangular duct. The flow is investigated in a wave frame of reference moving with the velocity c away from the fixed frame. The peristaltic waves propagating on the horizontal side walls of a non-uniform rectangular duct is studied under lubrication approach. The exact solutions of velo...

Technical Sessions (8 am Noon) 5A Aerospace – Coronado A 5BWear III – Coronado B 5C Condition Monitoring III – Mini Course and Papers: XRF for Lubrication Analysis – Coronado C 5D Seals I – Coronado D 5E Tribotesting – Coronado E 5F Lubrication Fundamentals V – Coronado F/G 5GMetalworking III – Fiesta 3/4 5H Commercial Marketing Forum V – Fiesta 5 5I Rolling Element Bearings I – Yucatan 1 5J No...

The solubility of fluorinated refrigerants in lubrication oil affects not only the stability performance of vapor compression refrigeration system, but also the safety control of start~up. It can cause oil foaming and reduction of viscosity, resulting in liquid slugging and improper lubrication. To void the deleterious effects, an oil heater is often used. But improper heater power can cause oi...

A mixed lubrication model is developed to investigate the lubrication of coupled journalthrust-bearing systems. The governing equations are mapped into a computational domain with a conformal mapping technique developed in a previous study by Wang et al. (2002). In order to study the influence of the boundary conditions on the performance of the bearing system, either the Reynolds boundary cond...

in order to reduce wear in gudgeon pin, bush and piston boss lubrication is done. oil used in national engine species was 10w40 with dynamic viscosity 5.5 mpa.s at 140 °c (the working temperature). in order to complete investigation the oil film hydrodynamics analysis in small end of connecting rod, a real full model engine with four cylinders has been simulated by avl excite5.1 software. in th...

Abstract Under severe conditions, solid contacts take place even when parts are lubricated. Precise mathematical conditions needed to describe the interior interface between fluid lubrication and solid-contact zones. In order distinguish for this from conventional boundary they named lubrication–contact (LCICs). work, LCICs derived with local flow continuity continuum mechanics point of view pr...