# Download Fluid Power Systems: Theory, worked examples and problems by A.B. Goodwin PDF

By A.B. Goodwin

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Additional info for Fluid Power Systems: Theory, worked examples and problems

Example text

3) If the gears have a mechanical efficiency of nG then Je = J/N 2 nG' WORKED EXAMPLES 1. Fig. 19 shows a hydraulic circuit where the actuator speed is controlled by a meter-in system employing a series pressure compensated valve. Determine the power input to the pump for the conditions indicated (steady state). If the series compensation is replaced by parallel compensation, and the load and speed of the actuator remains unchanged determine the change of overall efficiency of the complete circuit.

Under these conditi ons show that the maximum efficie ncy of the loaded circuit may be express ed as 2 TRANSMISSION SYSTEMS INTRODUCTION Power is transmitted from a prime mover or an electric motor by use of the hydraulic system. The pump (i) circulates the hydraulic fluid at a rate dependent on the pump capacity and speed of revolution and (ii) provides the necessary pressure to overcome the total load reflected on to it by the loaded system. The pump is driven by the prime mover or electric motor.

The hydraulic motor has a capacity of 140 ml/rev, a volumetric efficiency of 90% and a mechanical efficiency of 85%. 5 N m, 49% (b) 221 (c) 11~ 3. The following data apply to the circuit shown in fig. 25. Pump _ Shaft speed = 1000 rev/min, volumetric efficiency = 951 Variable~area orifice Flow equation Qc = 100 a/~p where Qc = ml/min, a = flow area mm2, ~p = valve pressure drop, bar. 25 Determine (a) The pump capacity (b) the system pressure at relief valve (c) the valve of K for the relief valve.