4,424,962

43.40.Tm SPHERICAL SPRING MOUNTING

Malcolm Johnston, London, England 10 January 1984 (Class 267/140.2); filed in United Kingdom 24 Oc-

tober 1980

A spherical spring mounting, for use by a handicapped person in a standing frame, comprises a central hub with a partly spherical outer sur- face, around which there are truncated spherical shells with intervening elastomeric layers. The hub may be connected with a selected shell so that a given degree of resilience can be provided.•GEW

4,531,362

43.40.Tm AERODYNAMIC DAMPING OF

VIBRATIONS IN ROTOR BLADES

Brian Barry and Christopher Freeman, assignors to Rolls-Royce Li- mited

30 July 1985 (Class 60/226.1); filed in United Kingdom 29 December 1980

In order to combat flutter in fan blades of turbofan engines, Helmholtz resonators are built into the fan's duct wall near the region swept by the blade tips. These resonators consist of axial tubular cavities communicating with the duct through small openings in the duct wall.--EEU

4,352,487

43.40.Tm VISCOUS SPRING DAMPER

Emile M. $htarkman, assignor to Gould, Incorporated 5 October 1982 (Class 267/35); filed 18 November 1980

This viscous spring damper has supports 16,18 connected by an elasto- merit shear spring 20. Fluid flows between chambers 26, 34 through orifice

56 60 52

54

4; •o

12 "/•' 42

78 80

84 86

42 when the assembly is deformed. Elastomeric bladders 50, 80 have rings 70 and ribs 78 to minimize abrasion and prevent hydraulic lock.--GEW

4,531,484

43.40.Tm VIBRATION RESPONSIVE MOUNTING ARRANGEMENT FOR AUTOMOTIVE ENGINE OR THE LIKE

Akira Kimura et al., assignors to Nissan Motor Company

30 July 1985 {Class 123/192 R); filed in Japan 20 November 1981

Vibration of an automobile engine relative to its chassis 14 is detected by sensor 66 which communicates with control circuit 70. The control cir- cuit activates solenoid 48 to change the volume of fluid-filled chamber 46 by

• 42, • 44 ,',

74 ! I0 ½ 70 • 26

ß 78 ' 7-'•6 i••••,••• • COMP I

CKT I •

means of piston 44. This action changes the fluid level in chamber 28 in order to reduce the vibration. In case of failure, elastomeric body 20 will provide isolation.--GEW

4,550,812

43.40.Tm FIXED POSITION, FIXED FREQUENCY PENDULAR-TYPE VIBRATION ABSORBER WITH

FREQUENCY LINEARIZATION

Kenneth C. Mard, assignor to United Technologies Corporation 5 November 1985 (Class 188/379); filed 8 September 1980

This patent pertains to a dynamic vibration absorber consisting of two equal masses M• and M2 fastened to a base 20 via equal hinged links a. A

spring 18 is placed between the two masses. Its precompression is selected so that the natural frequency of the masses varies little with their excursion for sizable angular deflections of the links a.--EEU

4,568,243

43.40.Tm VIBRATION ISOLATING SEAL FOR MOUNTING FANS AND BLOWERS

Dale W. Schubert and Richard S. Gureghian, assignors to Barry Wright Corporation

4 February 1986 (Class 415/213 C); originally filed 8 October 1981

A vibration isolating and sealing device for mounting a fan has an outer square frame; an inner square frame; and an elastomeric "S"-shaped flex- ural membrane connecting the inner to the outer frame.--GEW

4,558,852

43.40.Tm VIBRATION DAMPER WITH LINEARLY RECIPROCATING MASS

Heinz Steiner and Fritz Knoll, assignors to SIG Schweizerische Industrie-Gesellschaft

17 December 1985 {Class 267/137); filed in Switzerland 11 March 1982

This patent pertains to a dynamic absorber for use on power hammers and the like. A typical absorber consists of a mass that is free to slide axially

997 d. Acoust. Soc. Am. 80(3), Sept. 1986; 0001-4966/86/090997-02500.80; @ 1986 Acoust. Soc. Am.; Patent Reviews 997

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 138.251.14.35 On: Sun, 21 Dec 2014 08:09:24

along a shaft, but that is connected to a housing at its two ends via springs. The springs here are elastomeric spheres which are highly nonlinear and are said to adapt the absorber frequency to the excitation frequency.mEED

4,534,222

43.40.Yq FIBER-OPTIC SEISMIC SENSOR

George W. Finch and Eric Udd, assigners to McDonnell Douglas Cor- poration

14 August 1985 (Class 73/653); filed 8 August 1983

Two coils of fiber-optic material are placed in a housing---one above, and one below a mass. Motion of the housing causes the mass to induce a differential pressure on the two coils, resulting in a change in the relative optical path lengths in the two coils. This change results in a phase differ- ence in light transmitted through these coils, which difference is a measure of the housing acceleration. A claimed advantage of this sensor is its insensi- tivity to electromagnetic interference.--EEU

4,537,076

43.40.Yq APPARATUS FOR AND METHOD OF RANDOM VIBRATION CONTROL

David R. Lax, Michael Page, and James S. Johnstone, assigners to Schlumberger Electronics {U.K.) Limited

27 August 1985 {Class 73/662); filed in the United Kingdom 26 Jan- uary 1983

This patent pertains to a control algorithm to be used for making the spectral density with which a test article is vibrated match a prescribed spectral density. The spectrum (direct Fourier transform) of the signal actuating the driver is divided by the spectrum of the test article motion, and multiplied by the spectrum of the prescribed spectral density; the inverse transform of the result is the corrected input to the driver.--EEU

4,554,836

43.40.Yq LASER VIBROMETER

Michael J. Rudd, assigner to the United States of America 26 November 1985 {Class 73/657); filed 31 August 1984

Part of a beam of light from a laser is frequency-shifted by means of an acousto-optic modulator and caused to impinge on the surface whose vibra- tions are to be measured. The light scattered from the surface is focused via a lens on an end mirror of the laser which produced the original beam and is reflected therefrom. The reflected scattered light is heterodyned with the unshifted portion of the laser beam in a photodiode, to produce a phase- modulated signal at the acoustic frequency of the acousto-optic modulator. The instantaneous phase shift is a measure of the surface's displacement; its rate of change is a measure of the surface's velocity.--EEU

4,553,436

43.40.Yq SILICON ACCELEROMETER

Jan I. Hansson, assigner to Texas Instruments, Incorporated 19 November 1985 (Class 73/517 R); filed 9 November 1982

This accclcromctcr is intended to bc mass-produciblc by standard planar microelectronics processing techniques. It employs the piczorcsis- rive effect of single-crystal silicon to measure the flexure of semiconductor beams supporting a semiconductor mass.--EEU

4,555,946

43.40.Yq ACCELERoMETER

Nicholas R. Capaldi and Brian W. Griffin, assigners to Smiths Indus- tries Public Limited Company

3 December 1985 (Class 73/517 B); filed in United Kingdom 25 Febru- ary 1983

This patent pertains to an electromagnetic servo-accelerometer. It is said to bc less bulky than earlier &signs and to bc rnorc efficient because of lesser stray magnetic fields.--EEU

4,546,425

43.40.Yq PROCEDURE AND DEVICE FOR OPTIMIZATION OF THE VIBRATION AMPLITUDE IN VIBRATORY ROLLERS

Claes Breitholtz, assigner to Dynapac Maskin AB 8 October 1985 {Class 364/153}; filed in Sweden 1 April 1982

The optimal amplitude of a vibratory compactor here is taken to be the largest amplitude that does not result in excessive jolting forces on the rollers or frame of a vibratory compactor. In the present patent, signals from suitably mounted sensors actuate a control system and adjust the ec- centric elements in the rollers when the sensed vibration exceeds a predeter- mined value.--EEU

4,551,017

43.40.Yq LASER DOPPLER VELOClMETER FOR MEASURING TORSIONAL VIBRATION

Seetha R. Mannava, John F. McDonald, and Henry A. Scarton, as- signors to General Electric Company and Rensselaer Polytechnic Institute

5 November 1985 (Class 356/28.5); •ed 29 September 1982

A diffraction grating with periodicity in one or more directions is af- fixed to the moving surface. This grating produces Bragg order diffraction reflections at specific angles relative to the surface, which reflections con- tain information (in the form of Doppler shifts) concerning the motion of the grating. The Doppler shift information can be analyzed readily by means of conventional signal processing apparatus to provide velocity and acceleration data.--EEU

4,551,018

43.40.Yq ACOUSTIC EMISSION ANALYZER

Seetha R. Mannava, John F. McDonald, and Henry A. Scarton, as- signors to General Electric Company and Rensselaer Polytechnic Institute

5 November 1985 (Class 356/28.5); filed 30 September 1982

A diffraction grating is disposed on the surface of an object from which acoustic emissions are to be detected. A plane monochromatic light beam incident on the grating forms a number of Bragg diffraction orders at prede- termined angles. A detector positioned to intercept one of these orders re- ceives light whose frequency has been Doppler shifted by the motion of the object. A reference beam also incident on the detector heterodynes with the Doppler-shifted beam, so that the Doppler component can be recovered and subjected to analysis.--EEU

4,559,828

43.40.Yq SYSTEM FOR OPERATIONAL MONITORING OF A MACHINE

Ludwik J. Liszka, S•ivar, Sweden 24 December 1985 (Class 73/658); filed in Sweden 1 July 1983

This system, intended for simplified monitoring of machines, uses sen- sors, amplifiers, digitizers, and a microcomputer in an initial processing unit located near the machine to form and store time series data. This local

system communicates with a frequency analyzer, pattern recognition sys- tem, and other computer equipment that are located remotely.--EEU

4,325,460

43.50.Gf EJECTOR MUFFLER

Bruce B. Hoppenstedt, assigner to the Donaldson Company 20 April 1982 {Class 181/259); filed 14 April 1980

This patent describes a muffler ejector for use with the internal com- bustion engines of agricultural machinery. The muffler ejector serves the dual purpose of reducing the noise output of the engine exhaust and of furnishing a source of low-pressure air to scavenge the dirt, grit, and chaff from the inlet air cleaner. This design has the advantages that it easier to assemble, is smaller, and is structurally superior.--JBG

998 d. Acoust. Soc. Am. 80(3), Sept. 1986; 0001-4966/86/090998-01500.80; © 1986 Acoust. Soc. Am.; Patent Reviews 998

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 138.251.14.35 On: Sun, 21 Dec 2014 08:09:24