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| Number | Title | Issue Date |
| 8061210 | Robust low profile shaker An electrodynamic shaker apparatus is disclosed for providing shaking and/or vibrational motion. The shaker includes armature and stator assemblies as well as a distributed spring assembly. The shaker apparatus of the present invention is robust, supports increased ... | 11/22/2011 |
| 7938011 | High shock test apparatus A testing apparatus and method comprising providing a platform for a unit under test, charging a capacitor bank with a charging system, with a switching and power control system generating multiple pulses per cycle from energy from the capacitor bank, and with an el... | 05/10/2011 |
| 7387027 | Characterization of materials with optically shaped acoustic waveforms A method for characterizing one or more properties of a sample using acoustic waveforms is disclosed, and comprises directing a sequence of at least three optical pulses to the sample to generate an acoustic response in the sample at a frequency corresponding to the... | 06/17/2008 |
| 7383734 | Simulation of magnetic field induced vibrations in implantable medical devices A mechanical response of an implantable medical device (IMD) to a first static magnetic field and a first gradient magnetic field slew rate is simulated by exposing the IMD to a second static magnetic field having a magnitude greater than the first static magnetic f... | 06/10/2008 |
| 7347086 | System and method for burner-based accelerated aging of emissions control device, with engine cycle having cold start and warm up modes A method for accelerated aging of an automotive catalytic converter under conditions incorporating cold start simulations. ... | 03/25/2008 |
| 7332849 | Method and transducers for dynamic testing of structures and materials A transducer for dynamic testing of specimen is disclosed. The transducer comprises at least two equally-spaced actuators, and a supporting block for supporting the at least two equally-spaced actuators and for mounting the transducer to the specimen. Each of the at... | 02/19/2008 |
| 7245049 | Vibrator and method for manufacturing the same A vibrator of the present invention comprises a coreless coil (2), a driver (4) including a magnet (4a) inserted in the coreless coil (2), a yoke (4b) for pinching the coreless coil (2) and facing the magnet ( | 07/17/2007 |
| 7201546 | Machine tool and method for computing attachment position of balancer in machine tool When a rotary table rotates, a main control section of a multi-tasking machine detects vibration of the rotary table on which a workpiece is mounted based on fluctuation of a position droop computed by a servo system. The main control section computes the arrangemen... | 04/10/2007 |
| 7141029 | Vibratory apparatus of exercise A vibratory exercise apparatus capable of providing sufficient vertical movement force is provided that adopts a structure of a bobbin coil connected with a vibration plate employed in a magnetic gap of a magnetic circuit using a permanent magnet that can generate a... | 11/28/2006 |
| 7117754 | Torque ripple sensor and mitigation mechanism A torque ripple sensor and method for torque ripple sensing and/or mitigation. A piezoelectric sensor is positioned relative to a motor so that torque fluctuations due to torque ripple of the motor are transmitted to the sensor, resulting in strain of a piezoelectri... | 10/10/2006 |
| 7069787 | Robust low profile shaker An electrodynamic shaker apparatus is disclosed for providing shaking and/or vibrational motion. The shaker includes armature and stator assemblies as well as a distributed spring assembly. The shaker apparatus of the present invention is robust, supports increased ... | 07/04/2006 |
| 7051593 | Vibration testing apparatus and a method of vibration testing In order to provide a vibration testing apparatus which can have a large diameter without introducing undesirable rigid vibration modes, the vibration testing apparatus 1 comprises a support 2, at least one electromagnetic vibration generator 12... | 05/30/2006 |
| 7013731 | Data storage testing apparatus for delivering linear or rotational acceleration A testing apparatus for use with a data storage component that includes a base platform and a retaining element coupled to the base platform. The retaining element is sized and configured to retain the data storage component. The retaining element is linearly movabl... | 03/21/2006 |
| 6995496 | Electrical power extraction from mechanical disturbances A method of extracting power includes coupling a transducer that converts mechanical power to electrical power to a disturbance; coupling an electrical circuit to the transducer such that a peak voltage experienced by the transducer is greater than two times higher ... | 02/07/2006 |
| 6543289 | Rotational vibration testing apparatus A small-sized rotational vibration testing apparatus having a wide band of measuring frequencies and capable of directly driving a rotary table (1) to oscillate or vibrate in a rotational direction under the action of torque generated by a vibration apply... | 04/08/2003 |
| 6435031 | Position detecting device for hydraulic cylinder, and industrial vehicle equipped with the position detecting device An anti-vibration member is provided on an inner wall of a cylinder tube of a lift cylinder. The anti-vibration member is formed into a cylindrical form, and an outer circumferential surface thereof is formed along an inner circumferential surface of the ... | 08/20/2002 |
| 6330828 | Method and apparatus for subjecting a device to rotational vibration An apparatus for subjecting a disc drive to rotational vibration test profiles includes a mounting base, a disc drive mounting plate, and a rotary vibration motor assembly mounted between the mounting plate and the base in which the disc drive mounting pl... | 12/18/2001 |
| 6298729 | Catalytic converter testing A method and apparatus for testing the durability of a catalytic converter incorporating a catalyst support honeycomb supported by a resilient mounting material within an exterior converter enclosure, the method comprising vibrating the exterior of the co... | 10/09/2001 |
| 6257067 | Vertical direction spacecraft vibration test system with pseudo-free boundary conditions A method, apparatus, for subjecting a test object to vibrational energy testing is disclosed. The apparatus comprises a rotatable joint such as a hydrostatic ball joint for transmitting energy from a force generator to the test object, and a support struc... | 07/10/2001 |
| 6178822 | Method and device for multiplexed spectro-rheological measurements Three or more frequency components are used as deformation waveforms to perturb a sample during spectroscopic measurement. Simultaneously measuring more than one frequency allows for multiplexing. Further, many frequencies insure that the optimal perturba... | 01/30/2001 |
| 6170336 | Electromagnetic acoustic transducer and methods of determining physical properties of cylindrical bodies using an electromagnetic acoustic transducer An electromagnetic acoustic transducer for inducing and sensing vibrations in a cylindrical object and methods of using an electromagnetic acoustic transducer to determine resonant frequencies and physical properties of cylindrical objects. The electromag... | 01/09/2001 |
| 6119522 | Electromagnetic acoustic transducer and methods of determining physical properties of cylindrical bodies using an electromagnetic acoustic transducer An electromagnetic acoustic transducer for inducing and sensing vibrations n a cylindrical object and methods of using an electromagnetic acoustic transducer to determine resonant frequencies and physical properties of cylindrical objects. The electromagne... | 09/19/2000 |
| 6032533 | Absolute amplitude sensor device An absolute amplitude sensor device for measuring absolute vibrations comprising a non-contact displacement sensor, in particular, an eddy-current sensor and a vibrator. Said vibrator is comprised of a number of inertial mass pieces, springs, a damper and... | 03/07/2000 |
| 5895856 | Electromagnetic acoustic transducer and methods of determining physical properties of cylindrical bodies using an electromagnetic acoustic transducer An electromagnetic acoustic transducer for inducing and sensing vibrations in a cylindrical object and methods of using an electromagnetic acoustic transducer to determine resonant frequencies and physical properties of cylindrical objects. The electromag... | 04/20/1999 |
| 5777232 | Control system for vibratory apparatus In a vibratory apparatus including vibratory speed detector for detecting a vibratory speed of a vibratory machine, a self-excited oscillation controller for amplifying the output of the vibratory speed detector at a feed-back gain K, receiving the output... | 07/07/1998 |
| 5656779 | Apparatus and method for producing structural and acoustic vibrations A self-exciting vibratory device for producing vibration signals in a housing includes actuator means (12) attached to housing (16), sensor means (14) attached to housing (16) and electronics module (18) connecting actuator means (12) and sensor means (14... | 08/12/1997 |
| 5641910 | Electrodynamic transducer shaker and method for its manufacture A vibrator or shaker comprises an audio speaker and a mounting for attaching a payload to be vibrated. One end of the mounting is adhesively bonded to the outside of the speaker cone. The other end of the mounting has a threaded spindle for attaching the ... | 06/24/1997 |
| 5543956 | Torsional vibrators and light deflectors using the torsional vibrator A second torsional vibrator having an outer frame and a second torsional spring is formed on the outer side of a first torsional vibrator having a pair of torsional springs and a plate member (reflection mirror), with a second torsional vibrator being fix... | 08/06/1996 |
| 5493511 | High speed thin plate fatigue crack monitor A device and method are provided which non-destructively detect crack length and crack geometry in thin metallic plates. A non-contacting vibration apparatus produces resonant vibrations without introducing extraneous noise. Resulting resonant vibration s... | 02/20/1996 |
| 5488203 | Force compensator for inertial mass measurement instrument In an inertial mass measurement instrument, an active force compensator compensates for inertial forces transmitted by an oscillating elastic element to a primary support of the instrument. The compensator applies equal and opposite compensating forces to... | 01/30/1996 |
| 5414397 | Clamping device for magnetostrictive bodies The invention relates to an elastic clamping device for at least one body with magnetostrictive properties, wherein a pressure force presses the clamping device against the inner magnetostrictive body with a predetermined force. The pressure force extends... | 05/09/1995 |
| 5386728 | Vibrator for subjecting an object to vibration Apparatus is disclosed for subjecting a test object to a vibration test. A preferred embodiment of the apparatus uses a flat coil assembly with an arrangement of permanent magnets. The vibrator is small and light weight. Hinge structures are disclosed whi... | 02/07/1995 |
| 5343752 | High frequency vibration test fixture with hydraulic servo valve and piston actuator A vibration test fixture includes a reciprocating slip plate carrying an article subjected to vibration and shock testing. A pair of opposed, spaced apart low oil pressure hydrostatic linear bearings support the slip plate during reciprocating single-axis... | 09/06/1994 |
| 5156370 | Method and apparatus for minimizing multiple degree of freedom vibration transmission between two regions of a structure Arrays of actuators are affixed to structural elements to impede the transmission of vibrational energy. A single pair is used to provide control of bending and extensional waves and two pairs are used to control torsional motion in addition to these two ... | 10/20/1992 |
| 5144176 | Three-mass electromagnetic vibrating system An electromagnetic vibrating motor requires certain criteria to perform its functions. Such criteria include: achieving high amplitudes from the driven motor when compared with the relatively restricted active gap of a simple electromagnet, the amplitude ... | 09/01/1992 |
| 5111697 | Large-amplitude low-frequency vibrator A vibrator acting in a low frequency vibration domain, for fixing to and applying low frequency vibrations on a frame in a first predetermined direction along an axis X'X. The vibrator comprises: a first structure having cylindrical pole pieces cylindrica... | 05/12/1992 |
| 5047992 | Electromagnetically induced acoustic well logging An electromagnetic source or sources in a sonde in a well bore is caused to emit electromagnetic forces into the well casing. The electromagnetic forces cause displacement of the casing, inducing acoustic waves. The acoustic waves may be either P-waves or... | 09/10/1991 |
| 4947067 | Vibrator/dampener having magnetic suspension and servo-control along three axes A combination vibration generator and dampener having magnetic suspension and servo-control along three axes includes a hollow outer body fixed to a structure whose vibration is to be controlled, and an inner body which is essentially spherical in shape a... | 08/07/1990 |
| 4929874 | Vibration control system A vibration control system for damping vibration of an body to be isolated against vibration. The body is supported on a movable base through the medium of vibration-damping supporting structure. The control system comprises a vibration sensor for detecti... | 05/29/1990 |
| 4901579 | Stray magnetic field control system for vibration testing apparatus A stray magnetic field control system compensates for the generation of stray magnetic flux by the magnetic structure (body) of a load support shaker apparatus. The circuit includes a Hall effect magnetic field sensor for measuring the stray magnetic fiel... | 02/20/1990 |
