A vibrator-mounted holder is attached to a casing of a vibration generator which moves a vibrator to generate a vibration when used. The vibrator-mounted holder includes a vibrator, a vibrator retention unit retaining the vibrator, a fixing unit fixed to a casing, and an arm. The vibrator includes a magnet having a plate shape parallel to a horizontal surface and a yoke arranged on the magnet. The arm connects the fixing unit to the vibrator retention unit, and supports the vibrator retention unit in a manner that the vibrator retention unit is displaceable with respect to the fixing unit. The yoke has a projecting portion which is projected downward and fixed to the vibrator retention unit. The arm is connected to a portion, at which the projecting portion is arranged, within the vibrator retention units.

A vibrator-mounted holder is attached to a casing of a vibration generator which moves a vibrator to generate a vibration when used. The vibrator-mounted holder includes a vibrator, a vibrator retention unit retaining the vibrator, a fixing unit fixed to a casing, and an arm. The vibrator includes a magnet having a plate shape parallel to a horizontal surface and a yoke arranged on the magnet. The arm connects the fixing unit to the vibrator retention unit, and supports the vibrator retention unit in a manner that the vibrator retention unit is displaceable with respect to the fixing unit. The yoke has a projecting portion which is projected downward and fixed to the vibrator retention unit. The arm is connected to a portion, at which the projecting portion is arranged, within the vibrator retention units.

The present invention belongs to the technical field of mechanical testing devices, and provides a transverse load stepless amplitude modulation device of multiple bolt loosing tester. The transverse load stepless amplitude modulation device of multiple bolt loosing tester consists of four parts: a transverse load stepless amplitude modulation part, a transverse load transmission part, a torque load transmission part and an axial load transmission part. The transverse load stepless amplitude modulation device of multiple bolt loosing tester of the present invention provides stepless amplitude modulation continuous transverse loads for a flange bolt set and guarantees the accuracy of the transverse loads through a feedback control system.

There is disclosed a test device for testing high-pressure water tightness function of profiled components, comprising a toggle mechanism comprising a drive assembly and a toggle assembly, the toggle assembly comprising a mounting seat drivingly connected to the drive assembly and several toggle levers mounted to the mounting seat; and a carrier stage configured to carry components to be tested; wherein each toggle lever is provided with a carrier stage directly below the toggle lever, the toggle lever is selectively mated to the component to be tested on the carrier stage, and the drive assembly can reciprocally transmit power along the X-axis direction, and when the toggle lever is in a mating state with the component to be tested on the carrier stage, the toggle lever reciprocated linearly along the X-axis direction under driving of the drive assembly to toggle the component to be tested on the carrier stage.

An exemplary method for determining rattle noise of a vehicle steering system includes providing an intermediate shaft assembly including a first shaft member coupled to a second shaft member by a first joining member, a third shaft member coupled to the second shaft member by a second joining member, the first shaft member coupled to a first motor and the third shaft coupled to a second motor, providing a first sensor coupled to the first joining member and a second sensor coupled to the second joining member, sensors configured to measure an acceleration of the first joining member and the second joining member, applying a first torque and a second torque to the intermediate shaft assembly, receiving first acceleration data from the first sensor and second acceleration data from the second sensor, and analyzing the first and second acceleration data to determine a rattle noise of the intermediate shaft assembly.

A system is provided for testing a component. This system includes a support structure, an excitation system and a sensor system. The support structure is configured to support the component. The excitation system includes a plurality of excitation devices arranged in an array. The plurality of excitation devices at least include a first excitation device, a second excitation device and a third excitation device. The excitation system is configured to respectively control each of the plurality of excitation devices to excite a vibratory response in the component. The sensor system is configured to output data indicative of the vibratory response.

An exemplary method for determining rattle noise of a vehicle steering system includes providing an intermediate shaft assembly including a first shaft member coupled to a second shaft member by a first joining member, a third shaft member coupled to the second shaft member by a second joining member, the first shaft member coupled to a first motor and the third shaft coupled to a second motor, providing a first sensor coupled to the first joining member and a second sensor coupled to the second joining member, sensors configured to measure an acceleration of the first joining member and the second joining member, applying a first torque and a second torque to the intermediate shaft assembly, receiving first acceleration data from the first sensor and second acceleration data from the second sensor, and analyzing the first and second acceleration data to determine a rattle noise of the intermediate shaft assembly.

A system is provided for testing a component. This system includes a support structure, an excitation system and a sensor system. The support structure is configured to support the component. The excitation system includes a plurality of permanent magnets and a plurality of electromagnets. The permanent magnets are arranged in an array and configured for rigid connection to the component. Each of the electromagnets is associated with a respective one of the permanent magnets. The excitation system is configured to respectively control interaction of the electromagnets with the permanent magnets to excite a vibratory response in the component. The sensor system is configured to output data indicative of the vibratory response.

A test stand for characterization of a tunable mass damper may include (a) a support base including a stop member, (b) a test plate coupled to the support base, with the test plate configured to move relative to the support base and to fixedly carry a tunable mass damper, (c) a spring coupled to the support base and the test plate, (d) a lever configured to be releasably coupled to the test plate and to move the test plate relative to the support base against the urging of the spring, and (e) a latch mechanism configured to release the test plate from the lever when the test plate is at a predetermined position relative to the support base. The motion of the test plate, after the test plate has been released by the latch mechanism, may be halted by the stop member of the support base.

Systems and methods for modal testing of blades. A method for modal testing of a blade comprises providing a generally spherical fixture for retaining the blade in a fixed-free configuration. The method includes using an excitation device for exciting the blade while the blade is retained within a blade retaining portion of the fixture. The method comprises using a measurement device to measure a response of the blade to the excitation. The fixture includes an attachment portion configured for the securement of the excitation device to the fixture.