A fastener testing system includes a vibration testing apparatus including a test station and a preparation station. The preparation station is configured to have a plurality of test pieces sequentially assembled therein. The test station is configured to sequentially receive and vibrate each assembled test pieces of the plurality of test pieces.

A multi-axis vibration test system uses a mounting fixture formed from a solid block of Aluminum alloy, at least 20″ per side, and machined to form bearing recesses that receive the pad bearings to overcome the problems of existing systems and deliver the required amplitude of linear displacement over the frequency test band in all three, and possibly six, axes simultaneously and uniformly over the mounting surface(s) for both commercial and the more stringent military standards.

A method for isolating vibrations for centrifuge testing devices is provided. The method comprises coupling a test payload platform to a number of piezoelectric actuators and coupling the piezoelectric actuators to a reaction mass coupled to a centrifuge arm. A layer of vibration-absorbing material is sandwiched between the reaction mass and the centrifuge arm. The centrifuge arm is rotated around an axis, and the test payload platform is vibrated with the piezoelectric actuators as the centrifuge rotates, wherein the layer of vibration-absorbing material prevents vibrations from traveling down the centrifuge arm.

The disclosure provides a vehicle excitation advice. The vehicle excitation device that excites a vehicle having a plurality of wheels includes a plurality of excitation machine bodies on which the wheels are placed, respectively. The excitation machine body includes a front shaft and a rear shaft on which the wheels are placed at intervals in the in the front-rear direction of the vehicle, and an actuator (hydraulic actuator) that excites vibration to the wheels by moving at least one of the front shaft and the rear shaft in the front-rear direction. The front shaft is inclined such that the inner end portion of the front shaft in the left-right direction of the vehicle is located closer to the front of the vehicle than the outer end portion of the front shaft in the left-right direction of the vehicle.

The disclosure provides an excitation device, in which a vibration in a front-rear direction generated by excitation actuators is input to second bars via excitation arms and excitation shafts, and four wheels are vibrated by the vibrations of the second bars, so as to rotate a vehicle on at least one of a yaw axis, a pitch axis, and a roll axis. A controller controls a phrase and an amplitude of the operation of each of four piston rods of four excitation actuators.

A multi-axis vibration test system uses a mounting fixture formed from a solid block of Aluminum alloy, at least 20″ per side, and machined to form bearing recesses that receive the pad bearings to overcome the problems of existing systems and deliver the required amplitude of linear displacement over the frequency test band in all three, and possibly six, axes simultaneously and uniformly over the mounting surface(s) for both commercial and the more stringent military standards.

A linear actuator, comprising: a base; a fixed part support mechanism attached to the base; a fixed part elastically supported by the fixed part support mechanism; and a movable part driven to reciprocate in a predetermined drive direction with respect to the fixed part, wherein the fixed part support mechanism comprises: a movable block attached to the fixed part; a linear guide that couples the movable block with the base to be slidable in the predetermined drive direction; and an elastic member that is disposed between the base and the movable block and prevents transmission of a high frequency component of vibration in the predetermined drive direction.

The present invention provides large-amplitude vertical-torsional coupled free vibration testing device for bridges in natural winds, which comprises a rigid model, light-weight high-strength thin strings, linear extension springs, a rigid framework, spring protection tubes, a turntable, a rigid column, a motor, heavy blocks, and rigid thin circular rods. Based on the device, free vibration tests of a bridge deck rigid model can be carried out in natural wind with good conditions, and hence the large-scale wind tunnel device is no longer required. The scaling ratio of the rigid model is no longer limited by the wind tunnel size as in a traditional test, and the scaling ratio can be much larger. Compared with traditional wind tunnel test, the device is more suitable for large-amplitude vibration tests since it can reduce the geometrical nonlinearities of the extension springs and the blocking ratio.

An object of the present invention is to provide a dynamic characteristic measurement device capable of accurately measuring dynamic vibration characteristics of a rubber isolator and the like in a high-frequency vibration range. A dynamic characteristic measurement device according to the present invention includes a base, a support part that is placed above the base so as to be capable of floating via an air spring, an electrodynamic vibrator that is provided on the base side of an object under test mounted between the base and the support part and vibrates the object under test, and a load washer that is provided on the support part side of the object under test and measures a dynamic load applied to the object under test. Here, a crosshead of the support part is shaped such that a resonant frequency is at least 3 kHz.

A method for testing a rotor blade component of a rotor blade for a wind power installation, comprising: dividing a rotor blade component of a rotor blade for a wind power installation into two, three or more rotor blade component segments, forming cutouts in a connection interface at a connection end of one of the rotor blade component segments. A rotor blade component segment of a rotor blade for a wind power installation, the rotor blade component segment comprising a connection end which has been formed by dividing a rotor blade component of a rotor blade for a wind power installation into two, three or more rotor blade component segments, a connection interface at the connection end of the rotor blade component segment, and cutouts which are formed in the connection interface and serve for connection of the rotor blade component segment to a test stand.