Theoretical investigation on the infrasonic frequency response of measurement microphones in different venting states

Measurement ◽  
2020 ◽  
Vol 162 ◽  
pp. 107905
Author(s):  
Fan Zhang ◽  
Di Liu ◽  
Aibing Liu ◽  
Xianyue Gang ◽  
Lijun Li
Keyword(s):  
Frequency Response ◽  
Theoretical Investigation ◽  
Infrasonic Frequency

Asymmetrical Lap and Other Non-Linearities in Valve-Controlled Hydraulic Actuators

1968 ◽  
Vol 183 (1) ◽  
pp. 663-682 ◽  
Author(s):  
J. Montgomery ◽  
A. Lichtarowicz
Keyword(s):  
Differential Equations ◽  
Frequency Response ◽  
Theoretical Investigation ◽  
Peak Pressure ◽  
Open Loop ◽  
Hydraulic Actuators ◽  
Output Amplitude ◽  
Peak Pressures ◽  
Theoretical Analyses

The results of a theoretical investigation into the effect of asymmetrical lap on the open-loop performance of valve-controlled hydraulic actuators are presented. The governing differential equations of the system are developed in a non-dimensional form. The effects of supply lap and exhaust lap on actuator peak pressures, ram amplitude and cavitation, as well as the effect of inertia load on actuator peak pressure and output amplitude, are shown. When the open-loop frequency response of the hydraulic servomechanism is attempted experimentally the ram drifts until it hits its stops. In previous theoretical analyses this effect has not been noted. This paper demonstrates that the inclusion of a term ignored in previous work highlights this effect. This same term is shown to give a kind of feedback when the system drives a vertical inertia load.

Statistics of frequency-response estimates

1990 ◽  
Vol 137 (5) ◽  
pp. 290 ◽  
Author(s):  
J.L. Douce ◽  
L. Balmer
Keyword(s):  
Frequency Response
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