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The Effect of Design Features of Nozzle-Flapper Amplifiers on the Servovalve Dynamics

100%

Frąckowiak D. , Meler F.

tom Vol. 29, No. 2

45-57

This paper presents the effect of design features of nozzle-flapper amplifier used as first stage in hydraulic servovalves, with mechanical feed back on the servovalve response dynamics. The effect of the static characteristics of amplifier on the amplitudes, phase shifts and the waveform of response signal are analysed for the given sine input signal. The object of study is a servovalve with nominal flow of 40 dm3/min.

Mechanical properties modeling of neoprene in the contact zone of tool with the soil

80%

Kabała A. , Śledziński M. , Meler F.

tom Vol. 25

205--210

The investigations concern neoprene behaviour with contact of impact tools. Experimental method is used to solve nonlinear Young’s modulus of neoprene. The results of numerical simulation in FEM System ABAQUS/Explicit are compared with experimental results.

Numerical Simulation on the Ram Cooperation with the Neoprene

80%

Kabała A. , Śledziński M. , Meler F.

tom Vol. 36, No. 2

33-40

The paper presents numerical modeling and simulation of impact tool with contact of substitute soil. Neoprene plate is used as the substitute soil. The results of numerical simulation are compared with experimental results. FEM System ABAQUS/Explicit is applied to solve the numerical problem.