THE EFFECTS OF ENVIRONMENTAL NOISE ON VENTED FLUID AMPLIFIERS
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The effects of environmental noise on the static performance of vented fluid amplifiers was investigated. Two proportional amplifiers and one bistable amplifier were tested. A broad-band noise environment was used with sound pressure levels up to 163 decibels. Noise was allowed to enter the amplifier only through the vents. Proportional testing included input, gain, and output tests. Bistable testing included only switching pressure and switching flow rate tests. Results of the proportional amplifier noise tests showed that control flow and input resistance decreased, while control pressure increased. Amplifier gain decreased in the non-linear portion of the gain curve. The output pressure and flow decreased on the side of the amplifier having the lower control pressure, and increased on the opposite side. The phenomena of radiation pressure and jet spreading were related to these effects. These effects are minimized in amplifiers having high control flow rates and operating at high supply and control pressures. Results of the bistable amplifier tests indicated that less control pressure and control flow were required to switch the amplifier in the presence of noise than when noise was not present.
- Fluidics and Fluerics