JPH0743243A - Exciter - Google Patents

Abstract

PURPOSE:To provide an exciter which does not distort the waveform of driving signals impressed upon an exciting mechanism. CONSTITUTION:In an exciter which gives prescribed vibrations to an automobile 8 by driving an exciting mechanism 6 by means of a power amplifier 5 based on a waveform signal outputted from a function generator 2 in accordance with the results of performance tests, etc., and performs analysis, etc., on the behavior of the automobile 8 by detecting the behavior by means of a sensor, the phase control against one or multiple periods of the waveform signal is performed by means of a sensor amplifier 9, switch 10, input gain controller 11, phase measuring circuit 12 and phase controller 3 based on the output signal of a sensor so as to prevent the distortion of the waveform of the signals impressed upon the power amplifier 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating device for applying various mechanical vibrations to a test piece such as an automobile to perform a durability test and a performance test of each part of the test piece.

[0002]

2. Description of the Related Art In order to carry out a durability test of automobiles, buildings, structures, etc., various mechanical vibrations are applied to a predetermined portion, and various analyzes are carried out from the vibration state and the like. When performing such a test, there are various types of vibrations to be given, roughly classified into sine vibration, random vibration, and transient vibration.For vibrations other than transient vibration, a vibration device (or vibration vibration) is used. A device called a shaker is used.

There are various types of vibrating devices depending on the driving means, such as hydraulic type, mechanical type, electrodynamic type and piezoelectric type.
The frequency characteristics and maximum vibration force that can be excited differ depending on the method described above, and the electrokinetic type and the hydraulic type have the advantage that the frequency band and the excitation force can be relatively large. Moreover, the piezoelectric type cannot be applied to a large target.

By the way, when the object is an automobile, there are four vibration positions (four axle parts), and vibration is applied to these, and abnormal noise generated from the suspension at that time is analyzed or transmitted vibration. We are analyzing and evaluating the riding comfort. A durability test is also being conducted. Conventionally, a hydraulic multi-axis vibration device has been used for this type of application. Regarding this type of technology, for example, Japanese Patent Publication No.
18873, Japanese Patent Publication No. 57-16685 and the like.

[0005]

However, in the above-mentioned prior art, since the vibration type is used in the vibration device, there is a problem that waveform distortion is likely to occur.
Since the hydraulic type has hysteresis and therefore contains harmonic components, it cannot be used for analysis processing for performance testing of parts and the like, and is currently used exclusively for durability testing.

For example, the conventional electrohydraulic type has a harmonic component of about 30%, and the electrodynamic type has a harmonic component of about 10%. Practically, it is necessary to suppress the harmonic component to about several percent.

An object of the present invention is to provide a vibrating device which does not cause waveform distortion.

[0008]

In order to achieve the above object, the present invention drives a vibrating mechanism based on a waveform signal according to the contents of a performance test or the like to impart a predetermined vibration to a test piece. Then, in the vibration device for detecting the behavior at that time by the sensor and performing the analysis, the phase control means for performing the phase control for one or a plurality of cycles of the waveform signal based on the output signal of the sensor is provided. I have to.

When the object to be vibrated is a car, a plurality of vibrating mechanisms for independently vibrating each shaft of the car,
Signal generating means for generating a waveform signal according to the contents of a performance test and the like, a plurality of driving means for electrically driving the vibrating mechanism of the same system based on the signal from the signal generating means, and each of the vibrating means. A plurality of sensors for detecting the physical reaction of each part generated in response to the vibration by the mechanism, a plurality of gain control means for controlling the output level by the sensor based on the detection results of these sensors, and of this control means A multi-axis compatible configuration is suitable which includes a plurality of phase control means for applying a signal obtained by performing phase control of a signal generated by the signal generating means to the drive means of the same system based on the result of phase measurement for the output. ing.

[0010]

According to the above means, when the vibration is carried out based on the electric signal of the predetermined waveform, the physical reaction (behavior) accompanying the vibration is detected by the sensor as an electric signal, and based on this detection signal. Phase control is performed in one cycle or a plurality of cycles of the electric signal so that the waveform is not distorted. As a result, the analysis processing corresponding to the performance test of the specimen becomes possible.

Further, when the object to be excited is an automobile, when a plurality of electric type excitation mechanisms are used to excite each axle, the phase control means, the drive means, and the excitation means for one signal generating means. The gain control means controls the output level of the sensor based on the detection result of the sensor, and the output of the signal generation means is controlled by the gain control means. The phase control means controls the phase of the output signal. Power amplification is performed by this phase-controlled signal and the vibration mechanism is driven. This makes it possible to analyze abnormal noise generated from the suspension system of an automobile, analyze and evaluate the riding comfort due to transmitted vibration.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a vibrating device according to the present invention. In the following, an automobile is taken as an example of the vibration target.

The host computer 1 is used to download various patterns created by a high-performance man-machine interface using an RDBMS (relational database management system) and fetch measurement data. A function generator 2 as signal generating means is connected to the host computer 1 via an interface, and a phase controller 3 and an AGC (automatic gain control) circuit 4 are sequentially connected to the function generator 2. The function generator 2 outputs various waveforms such as a sine wave, a triangular wave, and a rectangular wave, and the AGC circuit 4 includes a filter at the output stage.

A power amplifier 5 as a driving means is connected to the AGC circuit 4 to excite an electrodynamic or electrohydraulic vibrating mechanism 6 in accordance with a waveform pattern output from the function generator 2. The vibration mechanism 6 is a pedestal 7
And one of the four tires of the automobile 8 is placed on this upper surface. Although only one vibration mechanism 6 is shown in FIG. 1 for convenience of description, a number corresponding to the number of tires is actually provided.

Each of the pedestal 7 and the vibrating mechanism 6 has various sensors (not shown) that handle only acceleration and displacement, but in reality, in addition to these, speed, load, stress, etc. Is provided, and the output signal thereof is captured by the sensor amplifier 9. As for the output signal of the sensor amplifier 9, the acceleration and the displacement are individually taken out, and one of them is selected by the switch 10. An input gain controller 11 is connected to the switch 10. This input gain controller 1
Reference numeral 1 is for adjusting the gain in accordance with the output of the sensor amplifier 9, and includes an attenuator and a filter.

A phase measuring circuit 12 is connected between the input gain controller 11 and the phase controller 3. The blocks and members extending from the phase controller 3 to the phase measuring circuit 12 are provided for each tire (4 axes), but here, only one axis is shown. The configuration including the phase controller 3, the AGC circuit 4, the input gain controller 11, and the phase measuring circuit 12 forms the control means.

In the above configuration, the command for vibration control is sent from the host computer 1 as a function command.
The waveform is supplied to the generator 2 and a waveform adapted to a desired performance test is output. This waveform signal passes through the phase controller 3 and the AGC circuit 4, is power-amplified by the power amplifier 5, and is then applied to the electric system of the vibration mechanism 6.

The vibrating mechanism 6 imparts vibrations according to the waveform of the applied power to the automobile 8, and the acceleration and displacement obtained by the vibration are detected by the acceleration / displacement sensor for each axis and amplified by the sensor amplifier 9. After that, it is taken into the input gain controller 11 via the switch 10, and the input gain controller 11 performs level adjustment and removal of noise components and the like.

With respect to the output signal of the input gain controller 11, the phase measuring circuit 12 measures the time base data of phase and gain, and based on this result, the phase controller 3 controls the phase of the output waveform of the function generator 2. By doing so, a waveform that has been corrected (total harmonic distortion: THD) so as not to cause distortion in the waveform for one period is generated. The output signal of the phase controller 3 is applied to the power amplifier 5 after the gain is adjusted by the AGC circuit 4, and the vibration mechanism 6 is driven.

As described above, the power waveform applied to the vibration mechanism 6 is always corrected by the loop that uses the acceleration and the displacement as parameters and performs the phase control and the gain control based on the parameters. Also, by performing gain control,
The control in the closed state becomes possible.

When performing phase control and gain control, there are sine waves and sweep sine waves (waveforms whose frequency changes with time) as the types of output waveforms of the function generator 2.

FIG. 2 is a block diagram showing another embodiment of the vibration device according to the present invention. It should be noted that this embodiment is an example of a vibrating device by transfer function correction control. In addition, in FIG. 2, the same reference numerals are used for the same elements as those in FIG. 1, and thus duplicated description will be omitted below.

An A / D (analog / digital) converter 1 is provided between the input gain controller 11 and the power amplifier 5.
3, measurement / spectrum calculation unit 14, transfer function calculation unit 1
5, spectrum operation unit 16, inverse FFT (fast Fourier transform) unit 17, D / A (digital / analog) converter 1
8 and the filter 19 are sequentially inserted in series.

The output signal of the input gain controller 11 is converted from an analog output signal into a digital signal by the A / D converter 13, a spectrum calculation is performed on the measurement result by the measurement / spectrum calculation section 14, and a transfer function calculation section is further performed. The transfer function is determined by 15. The spectrum calculation unit 16 performs spectrum calculation on the drive output based on the transfer function and the spectrum data (data corresponding to a desired spectrum wave).

Then, the inverse FFT unit 17 performs an inverse fast Fourier transform process, and the result is the D / A converter 18.
Converted into an analog signal by the filter 19
Is output to the power amplifier 5 through. The power amplifier 5 drives the vibrating mechanism 6 to vibrate the automobile 8 (in this embodiment, the ground plane). In this embodiment, the correction of the transfer function is specified by the time axis data.

According to the embodiment of FIG. 2, a spectrum wave, a shock wave, a superposed wave (a waveform in which a high frequency sine wave is superimposed on the contour of a sine wave), a rectangular wave, which cannot be used in the above embodiments, A triangular wave, for example, a time-series wave such as actual traveling data can be used, and for example, a situation in which a pebbles on a road is climbed can be reproduced.

In the above description, the phase control and the gain control are performed in one cycle, but it may be two cycles or more.

Further, in the description of the above-mentioned embodiment, the specimen is an automobile, but the invention is not limited to this.
The present invention can be applied to durability tests and performance tests of structures and buildings.

[0030]

Since the present invention is configured as described above, it has the following effects.

In the vibrating device according to the first aspect, the vibrating mechanism is driven based on the waveform signal according to the contents of the performance test or the like to impart a predetermined vibration to the sample, and the behavior at that time is detected by the sensor. In the vibration device for detecting and analyzing with
Since the phase control means for performing the phase control for one or a plurality of cycles of the waveform signal based on the output signal of the sensor is provided, the analysis processing corresponding to the performance test of the sample can be performed.

In the vibrating device according to the second aspect, a plurality of vibrating mechanisms for independently imparting vibration to each shaft portion of the automobile, and signal generating means for generating a waveform signal according to the contents of the performance test or the like. And a plurality of drive means for electrically driving the vibrating mechanism of the same system based on the signal from the signal generating means, and a physical reaction of each part generated according to the vibrating by each vibrating mechanism. A plurality of sensors for detecting, a plurality of gain control means for controlling the output level by the sensor based on the detection results of these sensors, and a signal generated by the signal generating means based on the phase measurement result for the output of the control means. Since a plurality of phase control means for applying a phase-controlled signal to the drive means of the same system are provided, it is generated from the suspension system of the automobile, which was difficult in the past. Analysis of sound, ride comfort analysis by transmission vibration, it is possible to test the performance of the evaluation, and the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a vibrating device according to the present invention.

FIG. 2 is a block diagram showing another embodiment of the vibration device according to the present invention.

[Explanation of symbols]

 1 Host Computer 2 Function Generator 3 Phase Controller 4 AGC Circuit 5 Power Amplifier 6 Excitation Mechanism 7 Pedestal 8 Car 9 Sensor Amplifier 10 Switch 11 Input Gain Controller 12 Phase Measurement Circuit 13 A / D Converter 14 Measurement / Spectrum Calculation Unit 15 Transfer function calculation unit 16 Spectrum calculation unit 17 Inverse FFT unit 18 D / A converter 19 Filter

Claims (2)

[Claims] 1. A drive mechanism is driven based on a waveform signal according to the contents of a performance test or the like to apply a predetermined vibration to a test piece, and a sensor detects the behavior at that time to perform analysis or the like. 2. The vibrating device according to claim 1, further comprising phase control means for performing phase control for one or a plurality of cycles of the waveform signal based on an output signal of the sensor. 2. A plurality of vibrating mechanisms for independently vibrating each shaft of a vehicle, signal generating means for generating a waveform signal according to performance test and other contents, and a signal generated by the signal generating means. A plurality of driving means for electrically driving the vibration mechanism of the same system based on the above, and a plurality of sensors for detecting a physical reaction of each part generated in response to vibration by the vibration mechanism, A plurality of gain control means for controlling the output level by the sensor based on the detection result of the sensor, and a signal obtained by performing phase control on the signal generated by the signal generating means based on the phase measurement result for the output of the control means. And a plurality of phase control means for applying the same to the driving means of the same system.