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Hydraulic Poppet Valve Stability
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English
Abstract
This paper presents the describing equations of a pressurecompensated poppet valve; the magnitude and phase relationships of the open-loop system are examined, and stability predictions made, using Nyquist techniques. Effects of chang ing the valve mass, valve-cavity volumes, and the lengths of supply and discharge lines are discussed.
Experimental data are presented on the observed system instability for various line lengths, valve-cavity volumes, and valve masses. The results of these studies are compared to the computer predictions, and other experimental observations are discussed.
The usefulness of Nyquist's criteria in analyzing the stability of the hydraulic poppet valve is discussed with respect to the problem of determining the location of poles of the open loop.
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Authors
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Citation
Wandling, D. and Johnson, B., "Hydraulic Poppet Valve Stability," SAE Technical Paper 720792, 1972, https://doi.org/10.4271/720792.Also In
References
- Stone J. A. “Discharge Coefficients and Steady-State Flow Forces for Hydraulic Poppet Valves.” Jrl. Basic Engineering, ASME Transactions Series D 82 1960 144 154
- Wylie E. B. “Resonance in Pressurized Piping Systems.” ASME Paper 65 1965
- Johnson B. L. Wandling D. E. “Transfer Functions and Input Impedances of Pressurized Piping Systems.” ASME Paper 66 1966
- Funk J. E. “Poppet Valve Stability.” ASME Paper 62 1960
- Stewart E. E. Johnson B. L. “Transfer Functions for Helical Compression Springs.” General Motors Engineering Publication A2235 General Motors Technical Center Warren, Mich. Jan. 18 1968