4,493,213

43.40.Yq RANDOM VIBRATIONS TESTING DEVICE

Yah S. Uretsky et al., assignors to Nauchno-Issledovatelsky Institut Introskopii; Kazansky Aviatsionny Institut Imeni A. N. Tupoleva, U.S.S.R.

15 January 1985 {Class 73/664}; filed 5 November 1982

This device is one for generating an electrical signal with a shaped spectrum. Adjustable narrow-band filters, coupled to phase inverters, are used to obtain the desired sharp spikes and deep notches in the spectrum.-- EEU

4,494,409

43.40.Yq ENGINE VIBRATION SENSOR

Haruyoshi Kondo et al., assignors to Kabushiki Kaisha Toyota 22 January 1985 {Class 73/651); filed in Japan 29 May 1981

This resonant sensor for engine knock detection consists of a cantilever made of piezoelectric material.--EEU

4,491,759

43.40.Yq PIEZOELECTRIC VIBRATION EXCITER, ESPECIALLY FOR DESTRUCTIVE MATERIAL TESTING

Werner Kunz and Walter Voigt, assignors to MTU Motoren-und Tur- binen-Union Muenchen GmbH

1 January 1985 (Class 310/328); filed in Federal Republic of Germany 14 March 1983

This vibration exciter, intended for subjecting small samples to vibra- tions at 20-100 kHz, is made up of equal sized stacks of piezoceramic disks. These stacks are assembled axially in a frame, so that one stack contracts as the other one expands, thereby moving an armature that is mounted between them.--EEU

4,492,285

43.40.Yq MOBILE HIGH FREQUENCY VIBRATOR SYSTEM

Delbert W. Fair and Paul L. Buller, assignors to Conoco, Incorporated 8 January 1985 (Class 181/114); filed 13 August 1979

This patent pertains to a truck-mounted system for generating vibra- tions in the ground. It consists of vertically acting electrohydraulic vibra- tors that can be pressed down uniformly and actuated or lifted up for travel, all by means of hydraulic and electronic controls.--EEU

4,371,054

43.50.Gf FLOW DUCT SOUND ATTENUATOR

Leslie S. Wirt, assignor to the Lockheed Corporation 1 February 1983 (Class 181/252); filed 21 December 1979

This patent describes a silencer for a gas turbine engine and is com- posed of three parts. The first is an absorptive surface to absorb low-fre- quency sound. The second is an acoustically lined duct to absorb high- frequency sound. These two parts form acoustically parallel paths for the sound. The third part is a horn-shaped plenum or conical diffuser to guide the flow to the other two parts.--JBG

4,384,020

43.50.Gf HONEYCOMB NOISE ATTENUATING STRUCTURES

Stanley L. Beggs, Frank J. Riel, and D. W. R. Lawson, assignors to Rohr Industries, Incorporated

17 May 1983 (Class 428/138); filed 11 January 1982

This patent describes the construction of honeycomb noise attenuation panels, for use within an aircraft jet engine inlet and nacelle structure where the panel is exposed to the engine noise. The panels have a cellular core bonded between two facing sheets. One sheet is perforated to which a thin sheet of porous felt is bonded. The other facing sheet is solid. The material has a predetermined flow-through resistance.--JBG

4,493,215

43.40.Yq VIBRATOR DAMPING FLOW METER

Theodor Gast, Kurt Binder, and Giinter Htnig, assignors to Robert Bosch GmbH

15 January 1985 (Class 73/861.18); filed in Federal Republic of Ger- many 23 June 1981

An electromagnetically excited cross-shaped vibrator, immersed in the pipe flow to be measured, is kept vibrating at its fundamental flexural reso- nance frequency. The amount of damping that the fluid provides to the vibrator provides a measure of the fluid flow rate.--EEU

4,494,410

43.40.Yq CONVERTOR APPARATUS FOR ACCURATE AND CONSISTENT NONDESTRUCTIVE TESTING OF OBJECTS

Gijsbertus F. J. Van Bochove and Petrus A. A.M. Somers, assignors to Fokker B. V.

22 January 1985 (Class 73/644); filed in the Netherlands 16 February 1982

This patent pertains to a means for measuring and controlling the pressure with which a piezoelectric vibrator is pushed against a test object. This result is obtained by use of a pneumatic or hydraulic system that acts on the support/housing of the piezoelectric element.--EEU

4,407,638

43.50.Gf SWASH PLATE TYPE COMPRESSOR WITH SILENCER STRUCTURE

Kazushi Sasaya et al., assignors to Hitachi, Ltd. 4 October 1983 (Class 417/269); filed in Japan 28 January 1980

This patent describes a swash plate type of compressor with a partition plate to divide an interior section into two parts. One part is a high-pressure chamber and the other part is the silencing chamber. The refrigerant is introduced into the high-pressure chamber and is discharged through the partition plate into the silencing chamber where the pressure pulsations are attenuated. Increased effects can be achieved by controlling the direction of flow through the silencer chamber.--JBG

4,433,751

43.50.Gf SOUND SUPPRESSOR LINER

Hilaire Bonneau, assignor to Pratt & Whitney Aircraft of Canada Limited

28 February 1984 (Class 181/213); filed 9 December 1981

This patent describes a sound suppressor for aircraft exhaust passages, which is based on the Helmholtz resonator principle, and is said to reduce the suppressor thickness while improving the attenuation. The device con- sists of a pair of curved walls with one wall being concave and the other wall being convex, and with the space between the walls gradually diminishing, thus forming an acoustic horn in reverse.--JBG

1643 J. Acoust. Soc. Am. 79(5), May 1986; 0001-4966/86/051643-01500.80; ¸ 1986 Acoust. Soc. Am.; Patent Reviews 1643

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