4,352,167

43.40.Rj METHOD OF LOCATING SOUND GENERA- TION WITHIN ENCLOSURE

Yuuji Hashimoto, Izumi Kobayashi, Mitsuo Suzuki, Kimio Yamada, Shigeru Izumi, and Yoshihiro Michiguchi, assignors to The Chubu Electric Power Company, The Chugoku Electric Power Company, The Tokyo Electric Power Company, and Hitachi, Limited

28 September 1982 (Class 367/127); filed in Japan 14 September 1979

If there is a loose part inside the pressure vessel of a nuclear reactor, and that part strikes the vessel's wall, it is important to know exactly where it strikes. This patent describes a method for locating the point of impact by using a number of sound detectors, preferably accelerometers, distributed over the surface of the vessel. In such a complicated structure, the impact cannot be located simply by comparing the arrival times or the amplitudes of the sound at the different detectors, but it can be done by combining both

0 t• tz ARRIVAL TIME DIFFERENCE t

techniques. The pressure vessel must be surveyed in advance by striking it with a hammer at some 100 locations, and observing the peak amplitudes and the comparative times of arrival of the sound at the first three detectors to receive it. For each location, a plot is made of the ratios of peak ampli- tudes versus the arrival times of the first three sounds. Here Ao represents the first arrival at zero time with an amplitude ratio of unify, while Bo and Co represent the second and third arrivals at later times with lower ampli- tudes. When a loose part strikes the vessel's wall, the times of the first three sound arrivals are designated zero, t,, and t2, and the corresponding peak amplitudes are V,, V2, and ¾3. These arrivals are represented by the points A, B, and C. A data processor compares this pattern with the 100 or so reference patterns for the locations that were surveyed in advance, and finds the location which has a reference pattern coinciding "to a most satisfactory degree."--LB

4,044,627

43.40.Tm VISCOUS DAMPER FOR SMOOTHING TOR- SIONAL AND BENDING VIBRATIONS IN ROTATING SHAFTS

Robert W. Zander, assignor to General Motors Corporation 30 August 1977 (Class 74/574); filed 1 March 1976

This is a viscous vibration damper for an engine crankshaft with an annular flywheel 26 in a viscous fluid-filled chamber 24. The flywheel is free

and has sufficient radial clearance to permit substantial lateral movement within the housing, but has axially oppositely facing working surfaces 60, 62, and 64, 66 in close shear film spaced relation to confronting surfaces of the housing so as to provide viscous damping for both torsional and radial (or lateral) vibrations. Springs 68 are provided to center the flywheel in the chamber and contri6ute to the damping effect. The arrangement provides torsional damping and also damps bending vibrations of the connected shaft which result in radial oscillations of the attached housing.--GEW

4,044,628

43.40.Tm TORSIONAL DAMPER

Roy T. Jacks, assignor to U.S. Manufacturing Corporation 30 August 1977 (Class 74/574); filed 24 March 1976

A torsional damper for reducing the vibrations of an internal combus- tion engine has an integrally formed disklike mass having three concentric zones. An intermediate spring zone has narrow, elongated, spirally ar- ranged, overlapping slots extending through the disk to provide spiral por- tions which act as torsional springs.--GEW

4,050,665

43.40.Tm VIBRATION DAMPING APPARATUS

John W. Matthews, Harry Dennis Sigel, and Peter Hauk, assignors to Newport Research Corporation

27 September 1977 IClass 248/358R); filed 11 February 1976

This is an apparatus for securing vibration sensitive equipment to a rigid structure. The vibration sensitive equipment is attached to the outer surface of the apparatus. The structure is rigidly attached to the base of the apparatus. A hollow interior contains at least two dynamic damping sys- tems having different resonance characteristics.•GEW

4,093,482 43.40.Tm HEAT AND SOUND INSULATOR OF

CURVED CORRUGATED PAPERBOARD AND METH-

OD OF SHAPING SAME

Mitsutoshi Ogata and Norinao Naito, assignors to Nissan Motor Company Limited and Fukuoka Paper Company Limited

6 June 1978 (Class 156/210); filed in Japan 15 May 1975

A plane plate of corrugated paperboard, which is produced by bond- ing a corrugated medium and at least one liner board with a thermoplastic resin, is shaped into a curved plate by means of a hot-press so that the resin flows and allows the medium and each liner board to conform to a curvature

during press forming. The resin hardens upon cooling and the curved shaped of the insulator plate is retained.•GEW

4,095,485

43.40.Tm ELASTIC SHAFT COUPLING WITH AT-

TENUATION OF TORSIONAL OSCILLATIONS

Heinz Max Hiersig, assignor to Mannesmann Aktiengesellschaft 20 June 1978 {Class 74/574); filed in Germany 9 January 1975

This is a supplementary arrangement to attenuate rotational vibra- tions in which elastic parts of a resilient shaft coupling are coupled by hy- draulic shock absorbers arranged to form a regular polygon about the shaft.•GEW

1885 J. Acoust. Soc. Am. 73(5), May 1983; 0001-4966/83/051885-01500.80; ¸ 1983 Acoust. Soc. Am.; Patent Reviews 1885

Redistribution subject to ASA license or copyright; see http://acousticalsociety.org/content/terms. Download to IP: 130.63.180.147 On: Sun, 23 Nov 2014 10:04:12