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Analysis forming the diameter reduction of the tube to the cylinder hydraulic shock absorber

Świątoniowski A., Szostak J., Gomułka K.

Journal of KONES

2014

Vol. 21, No. 1

281--286

The article presents the process of reducing the pipe and the influence of the shape of the tool on the geometric parameters of the cylinder. Charge material tube is precision welded cold drawn with an outer diameter ø 57 mm, made of stainless E355. Reduced pipe is used for cylinder hydraulic shock absorber. Formed cylinder is part of the structure MacPherson strut front suspension vehicle. Tube reduction process is carried out with cold working by using a hydraulic press. Analysed the influence of the diameter of the tool ø and profile angle 􀄮 transition into basic the geometric parameters of the deformed cylinder: inner diameter, wall thickness, pipe cylindrical deviation effect. The result of numerical simulation is a map of HMH stress. As well as the effect of the transition profile, angle the value of the tool diameter of the inner pipe, wall thickness and the value of cylindrical deviation effect. In this paper a comparative analysis of the outer diameter, inside diameter and cylindrical deviation effect for physical and numerical studies. Simulation of reduce tubes was carried out with DEFORM 3D software based on the finite element method. Numerical analysis allowed for a detailed knowledge of the specifics of the process and a comprehensive analysis of phenomena that are not possible to explore traditional methods.

Novel Energy Conservation Scheme for Three Phase Induction Motor Drives Employed in Constant Speed Applications

Winston D.P., Saravanan M.

Przegląd Elektrotechniczny

2012

R. 88, nr 11a

243-247

Due to low price, less maintenance, robustness and reliability, induction motors are used in most of the industrial applications. Nowadays, energy conservation is an important factor for the industries. This paper describes a smart Maximum Efficiency Slip Speed (MESS) energy conservation scheme for three phase squirrel cage induction motor drives, employed in constant speed varying load torque type applications. This paper discusses the advantage of proposed scheme under various set speeds, compared to existing scheme. A complete induction motor drive set up employing MESS scheme is developed and simulated for 5.4 HP, 4 Pole, 400V, 1430Rpm and 50Hz three phase squirrel cage induction motor In Matlab Simulink. The practical verifications is also done in 1 HP, 1400Rpm, 50Hz and 4 Pole three phase squirrel cage induction motor. The results for both simulation and hardware are discussed in this paper.

W artykule przedstawiono metodę sterowania trójfazową klatkową maszyną asynchroniczną w napędach o stałej prędkości i zmiennym obciążeniu, polegającą na regulacji poślizgu dla uzyskania maksymalnej sprawności energetycznej. Przedstawione w badań symulacyjnych i eksperymentalnych potwierdziły skuteczność proponowanej metody.