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| Number | Title | Issue Date |
| 7861594 | Apparatus and method for vibratory testing A method of operating a vibratory testing apparatus is disclosed including providing a table frame with at least one vibrator attached thereto and attaching the at least one vibrator to a solenoid valve, wherein an input of the solenoid valve is connected to a pneum... | 01/04/2011 |
| 7752914 | Monitoring of independent vibrators In a first embodiment of the present invention a method of monitoring individual vibrators in a pneumatic vibration testing system is disclosed. The method includes providing a pneumatic vibration testing system including at least one vibrator, where each vibrator i... | 07/13/2010 |
| 7363818 | Programmable vibrator A pneumatic vibrator for generating a series of force impulses whose frequency, duration, magnitude and shape can be statically and dynamically programmed by varying mechanical, pneumatic, or hydraulic parameters or a combination thereof. ... | 04/29/2008 |
| 7357085 | Machine guideway employing electromagnetic suspension A machine guideway for used in machine processing includes a base (10, 40), a slide block (20, 50) slideably received in a sliding groove of the base, and an electromagnetic suspension system. The electromagnetic suspension system provides a repulsion ... | 04/15/2008 |
| 7311435 | Shaking incubator The invention relates to a shaking incubator with at least one specimen storage device comprising several superposed specimen storage spaces. A shaking unit comprising a specimen storage position, a shaking platform and a base unit is arranged in at least one specim... | 12/25/2007 |
| 7302853 | Sliding vibration-resisting building model A sliding vibration-resisting building model includes a vibration machine having a vibration table provided thereon with a model base. Two vibration-resisting devices are fixed on the model base, and a model chassis is secured on the two vibration-resisting devices ... | 12/04/2007 |
| 7299698 | Vibration test module having controllable vibration attributes The present vibration test module enables a test engineer in the field of vibration test systems to precisely implement a vibration environment that is applicable to a wide range of applications and performance characteristics. The vibration test module comprises ad... | 11/27/2007 |
| 7267010 | Inertial mass guided single axis vibration test machine A single axis vibration test system includes a vibration force generator or “shaker” which can be used with a head expander, and separate pairs of hydrostatic self-aligning sliding bearings connecting two large reaction masses to the head expander. Preload force... | 09/11/2007 |
| 7063748 | Methods for coating particles and particles produced thereby Methods of coating core materials by providing target materials and core materials; ablating the target materials to form ablated particulate target materials; and coating the core materials with said ablated particulate target materials; wherein the method is perfo... | 06/20/2006 |
| 7052174 | Device for determining changes in dimension due to temperature fluctuation An apparatus for non-destructively testing the response of a specimen to temperature change. An embodiment temperature cycles a specimen, such as a wet mortar beam, dynamically measuring change in dimension and the temperature of the specimen during the cycle. Among... | 05/30/2006 |
| 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 |
| 7032452 | Earthquake simulating vibration table An earthquake simulating vibration table includes a vibration machine having a vibration table provided on the topside. Paper models are assembled on a model fundamental base that is fixed on the vibration table. The vibration machine is controlled by a computer to ... | 04/25/2006 |
| 7024918 | Apparatus and methods for dynamically pressure testing an article The dynamic pressure tester includes a first cylinder and a first piston movable relative to the cylinder. The piston may have one or more weights applied thereto. The cylinder is vibrated by a shaker table and pressure pulses in the fluid are transmitted to a stati... | 04/11/2006 |
| 7024323 | Control system for a failure mode testing system A control system for a failure mode testing system is described. The control system employs at least one control algorithm that enables the testing system to be operated at optimal pressure and frequency levels in order to generate a desired system response, such as... | 04/04/2006 |
| 6925416 | Simulation method for estimating performance of product made of viscoelastic material A simulation method of estimating performance of a product made of a viscoelastic material, comprising the steps of measuring a value of a strain, a strain speed, and a stress generated in viscoelastic material momently in a measuring condition equivalent to a state... | 08/02/2005 |
| 6917840 | Method of ascertaining control parameters for a control system A method of ascertaining control parameters for a control system having a controller and a plant includes establishing a model of the plant and a model of the controller and calculating a performance index for a closed-loop system as a function of controller paramet... | 07/12/2005 |
| 6904807 | Shakers and methods of testing Shakers and methods of testing suitable for various applications, including those presenting adverse test environments. The shakers have a permanent magnet assembly mounted in a sealed housing for vibration along a shaker axis. The permanent magnet assembly is doubl... | 06/14/2005 |
| 6860152 | High frequency multiple degree of freedom vibration test machine A vibration test machine comprises a stationary outer frame, a shake table in the form of a mass to which vibration energy is transmitted inside the outer frame, a driven preload piston supported by the outer frame and coupled to one side of the shake table, a passi... | 03/01/2005 |
| 6578659 | Ultrasonic horn assembly An ultrasonic sonication device includes a velocity transformer or probe which, when coupled to a vibrating transducer of the piezoelectric or magnetostrictive type, resonates in sympathy with the transducer and either increases or decreases the magnitude... | 06/17/2003 |
| 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 |
| 6044709 | Vibrator A vibrator has (a) a housing including a wall forming a cavity, (b) a sleeve in the cavity, and (c) a piston received in the sleeve for reciprocating movement therein. In the improvement, the cavity has a boundary surface inside the housing and the vibrat... | 04/04/2000 |
| 5996417 | Preload piston actuator A hydraulic actuator for vibration testing equipment includes a double-acting piston having a coaxial floating piston assembly coupled to one end of the piston rod. The floating piston assembly has a preload piston pressurized to allow the overall length ... | 12/07/1999 |
| 5836202 | Exciter mounting for random vibration generating table A shaker table (10) for testing and quality control of devices attached to the table is shown. The mounting table has pneumatic exciters attached (50) thereto. The exciters (50) are attached to the mounting table (20) with a mounting bolt (128) and spacer... | 11/17/1998 |
| 5744724 | Random vibration generating table A shaker table (10) for testing and quality control of devices attached to the table is shown. The mounting table has pneumatic exciters attached (50) thereto. The exciters (50) are attached to the mounting table (20) with a mounting bolt (128) and spacer... | 04/28/1998 |
| 5665919 | 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... | 09/09/1997 |
| 5594177 | Shaker table A shaker table comprises upper and lower plates spaced apart by a plurality of spacers that fit between the plates. Each spacer has an upper shaft, which threads into a vibrator opening in the upper plate, and a lower coaxial shaft, which slides into a vi... | 01/14/1997 |
| 5544528 | 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... | 08/13/1996 |
| 5365788 | Random vibration generating apparatus A shaker table (10) for testing and quality control of devices attached to the table is shown. The mounting table has pneumatic exciters (50) attached thereto. The mounting table (20) provides uniform distribution of forces applied by the pneumatic excite... | 11/22/1994 |
| 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 |
| 5154567 | Low frequency vibration assembly A vibration assembly comprising a housing (12) having a central cavity (20) and a pair of side cavities (22, 24) of radially smaller dimension than that of the central cavity, all of which extends axially about an axis (26) from opposed ends of the centra... | 10/13/1992 |
| 5138884 | Vibroacoustically coupled testing system A vibroacoustically coupled test system is provided utilizing acoustic technology combined with fluid dynamics to create a multipurpose dynamic environmental simulation system for use in geological, commercial, medical, military and marine testing and eva... | 08/18/1992 |
| 5024096 | Composite slip table of dissimilar materials for damping longitudinal modes A vibration slip table for use in a vibration testing apparatus. The table s comprised of at least three composite layers of material; a first metal layer, a second damping layer, and a third layer having a high acoustic velocity relative to the first laye... | 06/18/1991 |
| 4996881 | Vibration test fixture A vibration test fixture includes a reciprocating slip table carrying an article subjected to vibration and shock testing. The fixture includes low oil pressure hydrostatic linear bearings supporting the slip plate during single-axis linear travel on the ... | 03/05/1991 |
| 4852745 | Apparatus for automatically eliminating a group of articles to be treated of which at least one is missing or defective The present invention concerns an apparatus for automatically eliminating a group of articles to be treated of which at least one is missing or defective in this group, this apparatus comprising essentially a detecting cell located above the articles or c... | 08/01/1989 |
| 4783999 | Vibration test apparatus and bearing therefor Hydrostatic bearing vibration test apparatus in which the pillow block housing is opertively coupled to the workpiece by an oil film while the carriage blocks are fixed to the workpiece and the bearing shaft, the housing being supported on flexible bolts ... | 11/15/1988 |
| 4735089 | Shaker table A shaker table (10) includes a table base (12) mounted upon isolating supports (32) and vibrated by vibrators (34, 36). The vibration is conveyed through and damped in a flexure member (16) comprising pairs (26, 28) of honeycomb layers (18, 20, 22, 24) jo... | 04/05/1988 |
| 4679591 | Servovalve drive electronics improvements The present invention provides a circuit for obtaining higher accuracy and total system response for complex mechanical impedance loads, such as earthquake simulators, and in particular to compensate for limitations in controlling the actual valve spool d... | 07/14/1987 |
| 4602555 | Preloaded table coupling Table couplings for coupling hydraulic actuators to large shaking tables, such as earthquake simulator tables are preloaded under gaseous pressure to permit the couplings to be nontension carrying couplings, which in turn permits use of hydrostatic slip b... | 07/29/1986 |
| 4537077 | Load dynamics compensation circuit for servohydraulic control systems A load dynamic compensation circuit for a servohydraulic control system for fixtures and specimens being tested operating in various degrees of freedom, for example in an environment to simulate earthquakes to test building specimens, or to provide road p... | 08/27/1985 |
| 4506758 | High frequency reaction mass and hydraulic cylinder assembly A reaction mass and hydraulic cylinder assembly for a seismic transducer. A hydraulic biasing cylinder (76) is formed between a lower piston rod (32) and a reaction mass (44) and is located below a hydraulic drive cylinder (46). The lower piston rod (32) ... | 03/26/1985 |
