Class / Patent application number | Description | Number of patent applications / Date published |
073577000 | Fatigue study | 17 |
20090100933 | Vibration Dosimeter and Method of Monitoring Vibration Dosage - A vibration dosimeter ( | 04-23-2009 |
20100263448 | DUAL- AXIS RESONANCE TESTING OF WIND TURBINE BLADES - An apparatus ( | 10-21-2010 |
20110192230 | JIG DEVICE USABLE WITH FLAT DISPLAY PANEL AND ENDURANCE TEST METHOD USING THE SAME - A jig device usable with a flat display panel which includes a frame including a base frame having an opening and a vertical frame which extends vertically along a perimeter of the base frame and a supporting frame coupled to the base frame within the frame, on which the flat display panel is disposed, wherein the supporting frame includes fixing portions provided at corners thereof to support respective corners of the flat display panel. | 08-11-2011 |
20110271761 | METHOD OF EVALUATING THE AGEING OF AN ELECTRONIC ASSEMBLY - To measure the fatigue ageing of an electronic component in an electronic assembly subjected to mechanical excitations, a dynamic correspondence is established between kinematic measurements at certain points and mechanical stresses experienced at points that are critical as regards the reliability of the electronic assembly, which critical points may different from the measurement points. This correspondence is integrated into a monitoring device as a functionality that calculates the mechanical stresses directly as the value are being delivered by the kinematic sensors. The device also performs numerical processing of the mechanical stresses, thereby providing an indicator of the cumulative fatigue damage. The invention is such that the device can be incorporated into the electronic assembly, it being possible for this device to be autonomous both as regards processing the measurements and calculating the damage. | 11-10-2011 |
20120279305 | VIBRATION TEST APPARATUS - The invention concerns a vibration test apparatus for testing various fastening elements, in particular bolt/nut connections, where a fastening element is fixed in the vibration test apparatus and subjected to lateral oscillating or vibrating actions via a carriage which is movably connected to a connecting rod, where the connecting rod is connected with a stroke regulator, where the eccentricity of the stroke regulator is adjustable during operation via a regulating mechanism. The new feature of the vibration test apparatus according to the invention is that the eccentricity of the stroke regulator via a regulating mechanism is stepless and arranged internally of a stroke regulator and at least includes a slide, where the slide is displaceable in relation to a connecting rod bearing via a control rod. | 11-08-2012 |
20130213136 | FATIGUE TESTING DEVICE FOR WIND TURBINE BLADE TESTING, A METHOD OF TESTING WIND TURBINE BLADES AND A CONTROL SYSTEM FOR A BLADE TESTING ACTUATOR - The invention provides a fatigue exciter for wind turbine blades. Wind turbine blades require excitation at or near their natural frequency to induce bending moments that simulate in service loadings and must be easily controllable and with the minimum of unnecessary added mass or force. The invention provides a device and a method by which force controlled feedback is used for finding an optimal excitation frequency. This force could be provided e.g. by a digital signal generator. | 08-22-2013 |
20130312523 | ELECTRONIC APPARATUS, A METHOD FOR ESTIMATING A BREAK, AND A METHOD FOR ESTIMATING A FATIGUE LIFE - According to one embodiment, a first joint unit and a second joint unit are disposed with space on a heat radiation substrate. A joint area of the second joint unit is larger than that of the first joint unit. An insulated substrate is disposed on the first joint unit and the second joint unit. A corner region of the insulated substrate contacts the first joint unit. A first sensor to measure an acceleration of vibration applied to the insulated substrate is disposed thereon. The first sensor is more adjacent to the first joint unit than the second joint unit. A response spectrum of the acceleration is calculated. An extension status of joint failure of the first joint unit is decided by comparing a frequency of a maximum peak of the response spectrum with a reference frequency. A break of the second joint unit is estimated based on the extension status | 11-28-2013 |
20140130598 | METHOD OF CARRYING OUT A VIBRATORY FATIGUE TEST OF A MECHANICAL PART - A method of carrying out a vibratory fatigue test of a mechanical part having a fatigue endurance limit, the part including a repair extending partly on a first zone of the part, the method including a preliminary test phase including: selecting a loading mode of the part; determining a cutting of the part defining a truncated part, the cutting of the part being defined to obtain a loading level in the repaired zone equal to the maximum value of an abatement to be validated; selecting a measuring device for the fine control of the fatigue test by the measurement of a stress applied to a point of the part; determining a resonance frequency of the truncated part according to the selected loading mode; implementing a loading according to the selected mode at a given level of the truncated part at the resonance frequency up to rupture of the part. | 05-15-2014 |
20140174184 | METHOD FOR ULTRASONIC FATIGUE TESTING AT HIGH TEMPERATURE, AND TESTING DEVICE - Disclosed are a method for ultrasonic fatigue testing at high temperature and a testing device without needing preliminary Young's modulus measurement, and a method for ultrasonic fatigue testing at high temperature and a testing device capable of securing heat insulation for protecting a vibrator without water cooling of a horn, measuring end surface displacement of a test specimen in a noncontact manner, and solving problems of a noncontact temperature measurement of a test specimen and temperature control. Young's modulus is calculated by inverse calculation, a rod and a horn having heat resistance, heat insulation, and temperature symmetry of a test specimen are used, laser light is irradiated and received from an oblique direction to measure end surface displacement, and a noncontact temperature measurement of a test specimen by a black-body coating and a two-color radiation thermometer and temperature control by a high-frequency coil having a special shape are performed. | 06-26-2014 |
20160018284 | RESONANCE GENERATING DEVICE FOR TESTING FATIGUE OF BLADE THAT MAXIMIZES MOVING MASS RATIO AND FATIGUE TESTING METHOD USING SAME - The present invention relates to a resonance generating apparatus with maximized moving mass ratio for a blade's fatigue testing, which includes a light-weighted mounting portion provided in contact with an external surface of the blade, a plurality of actuators provided on an external side of the mounting portion, and a resonance generator configured to generate bending loads in association with displacement of rods of the actuators, and to reciprocate in parallel relationship with a moving direction of the actuator rod and simultaneously to prevent the resonance generator's motions in all directions except for a direction of testing, and a fatigue testing method using the same. | 01-21-2016 |
20160033357 | FATIGUE TESTING DEVICE - A fatigue testing device | 02-04-2016 |
20160047707 | RESONANCE GENERATING APPARATUS WITH REDUCED SIDE LOADS FOR A BLADE'S FATIGUE TESTING - A resonance generating apparatus for testing blade fatigue with reduced side load includes a mounting portion comprising a saddle including a groove corresponding to an external surface of a blade, and an assembling portion positioned on an external side of the saddle and joined by tightening members so that the saddle presses against the blade, a resonance generator including an actuator to generate a linear movement, a coupler(s) to maintain phase of a blade motion the same as an actuator rod, and a linear guide to guide a direction of linear reciprocating motion of an actuator body, and weights mounted on opposite faces of the actuator body to move in association therewith, and varied in a lengthwise direction of the blade so a center of gravity of moving masses of the actuator body in linear reciprocation and the additional weights is positioned on an axis of the actuator rod. | 02-18-2016 |
20160047709 | METHOD OF TESTING - The present invention provides processes by which fatigue testing can be carried out by altering the vibrational characteristics of a component, but without physically altering the component itself. In particular the invention provides a method of performing high-cycle fatigue testing on a component, the method including the steps of: attaching one or more masses to the component to alter the stress distribution of the component under vibration; and carrying out high-cycle fatigue testing by exciting the component at a low fundamental frequency of the component. The component can then be tested at a low frequency, which is easier to excite, but fail in a position of the component characteristic of a more complex modeshape. | 02-18-2016 |
20160061688 | FATIGUE TESTING OF A TEST SPECIMEN - The invention pertains to a combination of a test rig and test specimen for performing a fatigue test, wherein the test specimen is non-axisymmetric and comprises:—a central element,—a first branch element, which has a longitudinal axis that extends at an angle to the longitudinal axis of the central element,—a joint connecting the first branch element to the central element, which has an in plane bending resonance frequency with an associated in plane bending mode shape, and an out of plane bending resonance frequency with an associated out of plane bending mode shape, wherein the in plane bending resonance frequency and the out of plane bending frequency are substantially the same, wherein the first node of the in plane bending mode shape and the first node of the out of plane bending mode shape are substantially at the same position at the first branch element and wherein the test rig comprises:—a support for supporting the test specimen,—an excitator for subjecting the test specimen to forced vibration at an excitation frequency. | 03-03-2016 |
20160109323 | METHOD FOR ANALYZING MEASURED SIGNAL IN RESONANCE FATIGUE TEST AND APPARATUS USING THE SAME - A method and apparatus for analyzing a measured signal are provided in a resonance fatigue test that causes a complicated behavior and nonsymmetrical bending of a test article such as a wind turbine blade due to a coupling effect. In the method, a processor of the apparatus receives the measured signal from each of at least two measurement sensors attached to the test article and then extracts a moment load from the received measured signal by considering all of a first measured value in a first direction due to a first direction load, a second measured value in a second direction due to the first direction load, a third measured value in the first direction due to a second direction load, and a fourth measured value in the second direction due to the second direction load. | 04-21-2016 |
20160109416 | WIRELESS DIAGNOSIS APPARATUS FOR STRUCTURE USING NONLINEAR ULTRASONIC WAVE MODULATION TECHNIQUE AND SAFETY DIAGNOSIS METHOD USING THE SAME - The present invention relates to a safety diagnosis method for a structure using a nonlinear ultrasonic wave modulation technique. The safety diagnosis method includes: making the structure vibrate by applying signals of different ultrasonic frequencies; converting the responses of the structure generated by the vibration into digital signals; extracting first modulation signals by subtracting the harmonic responses and the linear responses of the signals of different ultrasonic frequencies from the digital signals and synchronously demodulating the digital signals; constructing a first sideband spectrogram by combining the first modulation signals generated by continuously changing at least frequency among the signals of different ultrasonic frequencies; and deciding whether the structure is cracked based on the first sideband spectrogram. Even though the power of the ultrasonic wave applied to the structure is very small as compared with the related art, whether there is the damage is precisely decided, and thus power consumption may be reduced. | 04-21-2016 |
20190145855 | Method and System for Accelerated Fatigue Damage Testing of an Object | 05-16-2019 |