Abstract: A vibration control device, while applying Gaussian vibration that matches a target vibration physical quantity PSD to a test piece, makes a corresponding vibration physical quantity non-Gaussian. Using a response vibration physical quantity PSD and a target vibration physical quantity PSD, a control vibration physical quantity PSD calculation generates a control vibration physical quantity PSD for generating a drive signal. A PSD conversion converts the control vibration physical quantity PSD into a control corresponding vibration physical quantity PSD of another dimension. Using the control corresponding vibration physical quantity PSD, a control corresponding vibration physical quantity waveform calculation calculates a control corresponding vibration physical quantity waveform that is non-Gaussian.

Abstract: A vibration control system calculates a Kurtosis Response Spectrum (KRS) of a response waveform which characterizes non-Gaussianity in a random vibration test and is utilized for vibration control. The system compares a target KRS and the response KRS, and controls a characteristic of a phase used to generate a waveform for control such that the response KRS becomes equal to the target KRS. The waveform for control is generated by applying a random phase to each frequency component of an amplitude corresponding to Power Spectral Density (PSD). The system controls a characteristic of this phase (e.g., standard deviation) per frequency, controls the KRS, deforms the waveform for control on the basis of an equalization characteristic, and calculates a drive waveform. The system sequentially updates the equalization characteristic on the basis of the response waveform and the drive waveform. The calculated drive waveform is provided to a vibration generator.

Abstract: An acceleration sensor core unit 1 includes a circuit board 3 and metallic plates 4, 5. The circuit board 3 is made of an epoxy resin, and an acceleration sensor 11 for detecting vibration acceleration in an arrow 105 direction is mounted thereon. The circuit board 3 is sandwiched between the metallic plates 4, 5. Ring-shaped metallic spacers 7a to 7c and ring-shaped metallic spacers 8a to 8c are respectively interposed between the circuit board 3 and the metallic plate 4 and between the circuit board 3 and the metallic plate 5. The circuit board 3 is screwed to each of the metallic plates 4, 5 at three positions. Thus, it is possible to reliably fix the circuit board 3 to the metallic plates 4, 5 with a small attachment space. In this way, rigidity as the acceleration sensor core unit 1 can be secured.

Abstract: A vibration generator includes a region including a first base plate structural element and a second base plate structural element. A first flow-passage-forming element is provided between the first base plate structural element and the second base plate structural element. The first flow-passage-forming element includes a first vertical flow passage and a horizontal flow passage. The first vertical flow passage supplies oil to a bottom face of the first base plate structural element and a bottom face of the second base plate structural element. The horizontal flow passage supplies oil to one of the side faces of the first base plate structural element and one of the side faces of the second base plate structural element opposite this one of the side faces of the first base plate structural element.

Abstract: A diagnostic device which can measure quickly and has simple circuit is provided. A charge/discharge circuit 2 supplies charge current to a rechargeable battery 10 and discharges the rechargeable battery 10. The charge/discharge circuit 2 also breaks charge current or discharge current of the rechargeable battery 10 in charging or discharging. A voltage measurement part 6 measures terminal voltage of the rechargeable battery 10 after breaking the charge or discharge current. Diagnostic means 8 judges whether the rechargeable battery 10 is deteriorated or not based on the measured voltages. Voltage change of deteriorated rechargeable battery 10 after breaking the charge or discharge current is more rapid than that of healthy rechargeable battery 10. The diagnostic means 8 can judge whether the rechargeable battery 10 is deteriorated or not based on such voltage change.

Abstract: A diagnostic device which can measure quickly and has simple circuit is provided. A charge/discharge circuit 2 supplies charge current to a rechargeable battery 10 and discharges the rechargeable battery 10. The charge/discharge circuit 2 also breaks charge current or discharge current of the rechargeable battery 10 in charging or discharging. A voltage measurement part 6 measures terminal voltage of the rechargeable battery 10 after breaking the charge or discharge current. Diagnostic means 8 judges whether the rechargeable battery 10 is deteriorated or not based on the measured voltages. Voltage change of deteriorated rechargeable battery 10 after breaking the charge or discharge current is more rapid than that of healthy rechargeable battery 10. The diagnostic means 8 can judge whether the rechargeable battery 10 is deteriorated or not based on such voltage change.

Abstract: Focusing on the criterion of “Energy save” or “Quiet noise” or other suitable operating parameter and considering the existing limitation of the operation of the electro-dynamic shaker system, apparatus for optimizing the operating condition of the vibration test system is proposed. The apparatus 100 measures the field current and drive current under the state that the desired vibration is fed to the specimen 20, and calculates the necessary force the shaker 1 should supply. Field current is supposed to be varied, and the necessary drive current is calculated based on the necessary force data. Further, the blower rotation is supposed to be varied, and the total power consumption at the coils and the blower is calculated. Also the temperatures of the field coil 4 and of the drive coil 10 is estimated and checked whether within the limitation. Then the optimal operating condition for the focused criterion is selected.

Abstract: Focusing on the criterion of “Energy save” or “Quiet noise” or other suitable operating parameter and considering the existing limitation of the operation of the electro-dynamic shaker system, apparatus for optimizing the operating condition of the vibration test system is proposed. The apparatus 100 measures the field current and drive current under the state that the desired vibration is fed to the specimen 20, and calculates the necessary force the shaker 1 should supply. Field current is supposed to be varied, and the necessary drive current is calculated based on the necessary force data. Further, the blower rotation is supposed to be varied, and the total power consumption at the coils and the blower is calculated. Also the temperatures of the field coil 4 and of the drive coil 10 is estimated and checked whether within the limitation. Then the optimal operating condition for the focused criterion is selected.

Abstract: Disclosed is a vibration test method for evaluating the vibration resistance of a specimen, comprising a test specification setting step (S10) of determining reference vibration conditions for the specimen based on transport conditions during actual transportation; a reference value attainment step (S20) of calculating an amplitude level and a reference accumulated fatigue value of the specimen under the reference vibration conditions; a test condition determination step (S30) of determining test vibration conditions and a test time based on an allowable amplification factor of the amplitude level and a desired vibration time, so that an accumulated fatigue value which is calculated from the vibration detection value of the specimen satisfies the reference accumulated fatigue value; and a vibration-imparting step (S40) of vibrating the specimen based on the test vibration conditions and the test time.

Abstract: Horizontal vibration shakers 21a and 21b are disposed opposite to each other on both sides of a vibration table 4, and either of the horizontal vibration shakers, e.g. 21a is arranged vertically movable so as to produce a positional difference (offset) with respect to a horizontal vibration axis 63 of the other horizontal vibration shaker 21b. When it is supposed that an accelerated velocity appears upwards on the left side of the vibration table 4, while another accelerated velocity appears downwards on the right side of the vibration table 4 as a result of generation of a rotational mode M, one of the horizontal vibration shakers, e.g. 21a, is elevated to produce the positional difference (offset) with respect to the horizontal vibration axis 63 of the other opposed horizontal vibration shaker 21b.

Abstract: Horizontal vibration shakers 21a and 21b are disposed opposite to each other on both sides of a vibration table 4, and either of the horizontal vibration shakers, e.g. 21a is arranged vertically movable so as to produce a positional difference (offset) with respect to a horizontal vibration axis 63 of the other horizontal vibration shaker 21b. When it is supposed that an accelerated velocity appears upwards on the left side of the vibration table 4, while another accelerated velocity appears downwards on the right side of the vibration table 4 as a result of generation of a rotational mode M, one of the horizontal vibration shakers, e.g. 21a, is elevated to produce the positional difference (offset) with respect to the horizontal vibration axis 63 of the other opposed horizontal vibration shaker 21b.

Abstract: The supporting apparatus is disposed between a fixed portion and a moving portion facing the fixed portion at a predetermined distance, and supports the moving portion which vibrates while maintaining parallelism to the fixed portion. The moving portion and the fixed portion are respectively provided with receiving members 2F, 2M facing each other. The receiving members 2F, 2M sandwich, under pressure, a rocking member 4 which limits a movement of the moving portion in crosswise directions Y vertical to vibrating directions R of the moving portion while rocking about Its axis accompanying the vibration of the moving portion in the vibrating directions (R).

Abstract: A measuring system for measuring a transfer function matrix of a system to be controlled by applying sine-wave excitations to a test object simultaneously by multiple number of vibrators. In the measuring system, when sine-wave signals for driving multiple number of vibrators are generated, phases between the sine-wave signals are shifted randomly, first, and then multiple number of vibrators are excited simultaneously under the generated sine-wave signals. Then, an auto-spectrum and a cross-spectrum for one calculation are calculated from spectral data on a vibration frequency obtained from an analysis of excitation signals and response signals acquired during the excitations.

Abstract: A vibration testing apparatus which is minimized in size and capable of being assembled with ease includes a vibrating section (11), a vibration generator (10), and a transmitting section (21) for transmitting vibrations from the vibration generator (10) to the vibrating section. The transmitting section (21) is formed with a pair of opposed parallel pressure-receiving plates (23, 24) that are orthogonal to the direction of vibrations, with the vibrating section (11) interposed between the pressure-receiving plates. The vibrating section (11) is formed with pressure-bearing surfaces (14) in opposed parallel relation to the pair of pressure-receiving plates (23, 24). High pressure fluid is fed into clearances (16), defined between the pressure-receiving plates (23, 24) and the pressure-bearing surfaces (14), to form a static pressure bearing. The pressure-receiving plates (23, 24) are clamped by a connecting member (25) under a load whose value enables the static pressure bearing to function as a spring.

Abstract: A vibration control system for generating desired random vibration environment with a given reference Power Spectral Density (P.S.D.) using a vibration generator on which a test object is fixed is disclosed. A detected signal representing vibration of a test object is converted into a response spectrum by Fast Fourier Transform (FFT) and the response spectrum is compared with the reference spectrum to determine a drive spectrum. Random drive signal having the determined drive spectrum amplitude is then generated continuously, and the signal is applied to a vibration generator on which the test object is fixed. This signal must be random i.e. nonperiodic, and therefore consisting of continuous spectral components with sufficient statistical independence. Method and facility to generate above mentioned signal are the principal of the present invention.