Accession Number : AD0287846

Title :   VIBRATION AND SHOCK EXCITER USING ELECTRIC-FIELD MODULATION OF HYDRAULIC POWER

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : EIGE,JOHN J. ; FRASER,EDWARD C.

Report Date : AUG 1962

Pagination or Media Count : 1

Abstract : The design is discussed of a novel form of shock and vibration exciter. This shock-shaker is driven by hydraulic power, controlled by valves with no moving prts. These modulators consist of concentric cylinders, insulated from each other, and separated by narrow gaps through which a special dielectric fluid is pumped. Voltages applied between the cylinders control the fluid flow by their direct action upon the fluid, in what was called the Winslow effect. New information about the behavior of this electric fluid was developed in order that a mathematical model of a shock-shaker system could be formulated. The resulting equations allow scaling the system to fit specified output goals, given various fluid paameters. The electrical circuits developed during this project provide for acceleration feedback, to reduce distortion and to regulate acceleration level, and for position feedback to keep the output piston centered. Brief tests showed that this shock-shaker was capable of vibrating a 10-pound mass at 17 g peak. Maximum response was at about 150 cps, falling off at higher or lower frequencies, with usable response between about 20 cps and 3000 cps. (Author)

Descriptors :   *ACCELERATION, *DIELECTRIC PROPERTIES, *HYDRAULIC FLUIDS, *HYDRAULIC EQUIPMENT, *IMPACT SHOCK, *TEST FACILITIES, *VIBRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE