4,782,452

43.40.Yq ACOUSTIC DETECTION OF MILLING TOOL TOUCH TO A WORKPIECE

Charles E. Thomas, assignor to General Electric Company 1 November 1988 {Class 364/$$0); filed 25 August 1986

Contact of a milling too1 with a workpiece at the beginning of a cut is determined by logical processing of an accelerometer signal. The detection algorithm differentiates between the contact signal and "spiky" noise, which generally occurs in milling machines.--EEU

4,792,676

43.40.Yq GYRO APPARATUS WITH A VIBRATION PORTION

Takeshi Hojo and Takafumi Nakaishi, assignors to Kabushiki Taisha and Tokyo Keiki

20 December 1988 {Class 250/231 GY); filed in Japan 22 October 1985

This patent pertains to an inertial rotation sensor in which the sensing element consists of a vibrating reed with a circular cross section. The reed's plane of vibration remains fixed in space as the reed and its housing are rotated about its axis--i.e., the reed behaves much like a Foucault pendu- lum. Thus the housing's rotation in inertial space may be measured in terms of the change of the reed's plane of vibration relative to the housing.--EEU

4,788,968

43.40.Yq ELECTROMAGNETIC VIBRATOR

German E. Rudashevsky, Alexandr G. Krichevsky, Olga G. Blokhina, and Alexandr S. Mirkin, assignors to Institute Mashinovedeniya imeni Blagnonravova, A.A. AN USSR

6 December 1988 {Class 128/41); filed in USSR 24 July 1985

This vibrator is intended for the stimulation of mechanoreceptors on the human body at frequencies up to 250 Hz with an amplitude of 1 min. It consists of a housing with an annular electromagnet, in the center of which is mounted a contactor that contains a permanent magnet and that is free to oscillate along the electromagnetic coil's axis.--EEU

4,803,883

43.40.Yq ACCELEROMETER

Sidney G. Shutt, assignor to Rockwell International Corporation 14 February 1989 (Class 73/517 B); filed 9 November 1987

This patent pertains to a servo accclerometer in which a proof mass is supported on a leaf that protrudes from a hinge that prevents the mass' motion out of the sensing plane. A rotational actuator is situated on the other side of the hinge, which is driven by a servo signal and serves to maintain the mass' position relative to the housing.--EEU

4,790,189

43.40.Yq METHOD FOR ELIMINATING SENSOR DRIFT IN A VIBRATION MONITORING SYSTEM

Michael Twerdochlib, assignor to Westinghouse Electric Corporation 13 December 1988 {Class 73/660); filed 2 March 1987

In this method for correcting position-time data for blades in turboma- chines, the blade position of a rotating blade is monitored as a function of rotational position. By means of sensors located on the stator around the rotor periphery, the actual passage time of a blade from one sensor location to another is compared to the average passage time. Measured displace- ments between blade position and sensor position at the average passage time may be used to derive a time signal indicative of blade vibration.-- EEU

4,733,750

43.50.Gf ACOUSTIC ENCLOSURE FOR MARINE ENGINE GENERATOR SET

Randall J. Poirier, Scott J. Haugstad, and Martin W. Heinrich, as- signors to Kohler Company

29 March 1988 {Class 181/202); filed 11 February 1987

An acoustically lined enclosure for a marine engine-generator set in- cludes a squirrel-cage fan driven by the engine to draw air through the enclosure and across the generator and 'around the water-cooled engine. Entrance and exit ducts are partially baffled, but they seem to be the weak elements in the design.--CHA

4,749,150

43.50.Gf TURBOFAN DUCT WITH NOISE SUPPRESSION AND BOUNDARY LAYER CONTROL

4,796,026

43.40.Yq NOISE TOOL AND METHOD

John A. Hammond, assignor to Western Atlas International, Incorpo- rated

3 January 1989 {Class 340/857); filed 20 July 1987

This patent describes an acoustical well logging too1 that is lowered into a borehole in order to determine the local soil conditions. The too1

consists of a stack of piezoelectric sensors and a signal processing system which converts the sensors' outputs to forms that are favorable for wire transmission in the presence of noise. Two conversions are available: in one, the signal is converted to a series ofdc pulses, with the pulse rate representa- tive of the signal amplitude; in the other, a frequency-modulated signal is generated, with the frequency corresponding to the sensor signals' ampli- tude.--EEU

Philip M. Rose and Alojzy A. Mikolajczak, assignors to Rohr Indus- tries, Incorporated

7 June 1988 (Class 244/53 B); filed 24 December 1985

A boundary layer control device is installed in the acoustically treated inlet duct of a turbofan engine. The device sucks off the turbulent boundary layer of air flowing over the inner or "air wetted" surface of the inlet during aircraft takeoff, cruise, and approach. The lip of the inlet can thus be made thinner to reduce drag during cruise without degradation of fan perfor-

•122 124 •

mance during takeoff. The acoustical liner of the inlet comprises a micro- porous honeycomb sandwich structure through which air may be sucked at various locations through headers and conduits connected to an onboard pump.--CHA

857 J. Acaust. Sac. Am. 86(2), Aug. 1989; 0001-4966/89/080857-01500.80; @1989 Acaust. Sac. Am.; Patent Reviews 857

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 69.166.47.144 On: Mon, 24 Nov 2014 00:22:52