JPS61194512A - Vibration simulator - Google Patents

Abstract

PURPOSE:To simulate accurately the multi-dimensional vibrations of a vibrating state by producing the vibrations by the signals sent from a horizontal cross signal generator and a vertical cross signal generator to correct the vibrations in the directions opposite to each other. CONSTITUTION:When a vibrating state is vibrated only in the horizontal direction, the sine wave vibrations equal to the desired sine wave vibrations given from a horizontal command signal generator 5a and sent to a horizontal signal synthesizer 9a and a horizontal cross signal generator 8a. The generator 8a produces a signal B which has a frequency double as high as the signal A given from a vertical command signal generator 5b and drifted in the positive direction by 1/2 total amplitude. The coincidence of phase is secured between both signals A and B with the prescribed timing. As a result, these signals A and B are supplied to the synthesizer 9a and a vertical signal synthesizer 9b respectively. Then the output of the synthesizer 9a is distributed to horizontal amplifiers 10a and 11a and a horizontal driver 3a is driven by the signal A. Thus the vibrations are produced automatically by the vibrating stage. In this case, the output of the synthesizer 9b also has the same function as the synthesizer 9a for correction of vibrations. Then only the horizontal linear movement is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration simulator that simulates various vibration conditions.

[Conventional technology]

Conventionally, there have been vibration simulators of this type shown in FIGS. 3 and 4.

Figure 3 is a side view showing the configuration of a vibration simulator for horizontal and vertical two-dimensional vibration. The drive device b3b is a second drive device for vertical vibration; 4 is provided at both ends of the first and second drive devices 3a and 3b; Or 3b and the above vibration table 1. and a universal joint that connects the first or second drive device 3a or 3b and the base 2.

FIG. 4 is a block diagram showing the signal path input to the vibration simulator shown in FIG. a vertical direction command signal generator for generating vibration; 6 is a drive amplifier in each drive device; A is an output from the horizontal direction command signal generator 5&;
The horizontal drive signal B, which is distributed to and input to the drive amplifier 6, is a vertical drive signal output from the vertical command signal generator 5b, and distributed to and input to the drive amplifier 6.

Next, the operation will be explained. Now, consider the case where the vibration table 1 is vibrated only in the horizontal direction with a sine wave.

In this case, the horizontal direction command signal generator 5a outputs a sine wave signal identical to the intended sine wave vibration, which is distributed and inputted to the drive amplifier 6, and is then distributed to the first drive device 3 for the horizontal direction.
A performs expansion and contraction regulated by a sine wave. Further, a zero signal is outputted from the vertical direction command signal generator 5b, which is similarly distributed and inputted to the driving amplifier 6, and the second driving device 3b for the vertical direction is maintained at a constant length. At this time, the vibration table 1 moves in the horizontal direction with a predetermined sine wave, but since the length of the second driving device 3b for the vertical direction is finite, the vibration table 1 simultaneously moves with a minute vertical movement. Movement occurs. In the above explanation, we have described the case where the vibration table 1 is vibrated with a sine wave only in the horizontal direction, but in general, when making arbitrary vibrations in a two-dimensional horizontal and vertical space, the influence of the vibration in the horizontal direction is The effect of vertical vibration appears as horizontal vibration.

[Problem that the invention seeks to solve]

Conventional vibration simulators for two-dimensional vibrations are configured as described above, so they cannot accurately simulate two-dimensional vibrations, and they also create and store vibration waveforms to calculate vibration signals for multiple drive devices. If an attempt was made to construct a multidimensional vibration control device like this, there were problems in that the arithmetic circuits etc. would be extremely complicated, the device as a whole would be expensive, and it would be difficult to handle.

This invention was made to solve the above-mentioned problems, and allows the multidimensional vibration of the vibration table to be accurately controlled without the influence of vibration in the horizontal or vertical direction appearing as vibration in other directions. The purpose is to obtain a vibration simulator that can simulate vibrations.

[Means for solving problems]

The vibration simulator according to the present invention includes a multidimensional vibration control device including horizontal and vertical cross signal generators that generate signals with twice the frequency components from vibration waveforms in each direction, so that, for example, when a vibration waveform in the horizontal direction is generated, At the same time, vibration is applied in the vertical direction to correct the circular arc motion of the vibration table, so that it becomes linear motion only in the horizontal direction.

[For production]

The vibration simulator of this invention uses signals from the horizontal cross signal generator and the vertical cross generator to give vibrations so as to mutually correct vibrations in each direction, so that the multidimensional vibration of the vibration table can be accurately controlled. becomes.

〔Example〕

FIG. 1 is a block diagram of a control device added to a vibration simulator showing one embodiment of the present invention. In the figure, 5m and 5b are signal generators equivalent to the conventional ones described above, 8m is a horizontal cross signal generator that generates a signal with twice the frequency component based on the signal generated from the vertical direction command signal generator 5b, and 8b is a horizontal signal generator. The vertical cross signal generator b9m, which generates a signal with twice the frequency component based on the signal generated from the direction command signal generator 5a, adds and synthesizes the output signals of the horizontal direction command signal generator 5a and the horizontal cross signal generator 8a.゛Horizontal signal synthesizer 9b is a vertical signal synthesizer 10& which adds and synthesizes the output signals of the vertical direction command signal generator 5b and the vertical cross signal generator 8b.

Reference numeral 11a indicates horizontal drive amplifiers provided in the same number as the horizontal direction drive devices, and 10b and llb indicate vertical drive amplifiers provided in the same number as the vertical direction drive devices 3a.

The operation of the present invention will be explained by taking as an example a case where the vibration table 1' is vibrated in a sinusoidal wave only in the horizontal direction. In this case, a sine wave signal identical to the desired sine wave vibration is output from the horizontal direction command signal generator 5a, and this output is sent to the horizontal signal synthesizer 9a and the horizontal cross signal generator 8a. The horizontal cross signal generators 8a and 8t are as shown in FIG.
It has twice the frequency of the signal input from the vertical command signal generator 6b, and 1/! of the total amplitude! A signal B that is shifted in the positive direction by an amount of is generated. The phase relationship between the signals A and B matches at the timings 'h, T2, and Ts in the figure.

As a result, the signal HI is input to the horizontal signal synthesizer 9a, and the signal B is input to the vertical signal synthesizer 9bK. In this embodiment, in order to vibrate only in the horizontal force direction, the output of the vertical command signal generator 55b is set to zero, and only signals A and B are input to the horizontal and vertical signal combiners 9m and 9b, respectively. Thereafter, the output of the horizontal signal synthesizer 9a is transmitted to the horizontal drive amplifiers 10, . 11-, horizontal drive device 3a
is driven by the waveform of signal A to generate the desired horizontal sine wave vibration in the vibration table 1. At this time, the output of the vertical signal synthesizer 9b is simultaneously distributed to the vertical drive amplifiers 10b and llb to drive the vertical drive device 3b with the waveform of the signal B.
The vibration table 1 is driven at the timing shown in FIG. This corrects the arcuate motion that occurs due to the finite length of the vertical drive device 3b, and enables linear motion only in the horizontal direction.

That is, at the timing T1 in FIG.
When is P, the horizontal drive device 3a extends, and the vertical drive device 3b tilts in an arcuate motion. At this time, since the signal Q of the signal B is inputted to the vertical drive device 3b, the vertical drive device 3b is extended by the amount by which the vibration table 1 is lowered due to the circular motion. Conversely, also at the timing TS in FIG. 2, the vertical drive device 3b extends by the amount that the vibration table 1 is lowered by the circular arc movement.

Therefore, in the vibration simulator according to the present invention, the influence of horizontal vibration does not appear as vertical vibration.

Further, in the above embodiment, the operation was explained when vibrating with a sine wave in the horizontal direction, but the same operation can be performed when vibrating with a sine wave in the vertical direction.
The same effects as in the above embodiment are achieved.

Furthermore, in the above embodiment, the case of a two-dimensional vibration simulator was explained, but a three-dimensional vibration simulator,
The present invention may also be applied to an aircraft flight training device, and the same effects as those of the above embodiments can be achieved.

〔Effect of the invention〕

In a multidimensional vibration control device that generates horizontal direction command signal generator and vertical direction command signal generator.

Adding a multidimensional vibration control device consisting of a horizontal cross signal generator, a vertical cross signal generator, a horizontal signal combiner, a vertical signal combiner, a horizontal drive amplifier, and a vertical drive amplifier to the conventional equipment. This has the effect of accurately simulating multidimensional vibrations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a multidimensional vibration control device for a vibration simulator according to an embodiment of the present invention, FIG. 2 is a waveform diagram for explaining the waveform generated by the horizontal cross signal generator of FIG. FIG. 3 is a side view showing the configuration of a conventional vibration simulator, and FIG. 4 is a block diagram showing a multidimensional vibration control device of the conventional vibration simulator. In the figure, 1 is an excitation table, 3a and 3b are drive devices, 4 is a universal joint, 5& is a horizontal direction command signal generator, 5b is a vertical direction command signal generator, 8m is a horizontal cross signal generator, 8
b is a vertical cross signal generator. 9a is a horizontal signal synthesizer; 9b is a vertical signal synthesizer. 10m, 11& are horizontal drive amplifiers, and 10b, llb are vertical drive amplifiers. In each figure, the same reference numerals indicate the same or equivalent parts. Patent applicant: Mitsubishi Electric Corporation (2 others)
jD Figure 2 11+2 13 Figure 3 Figure 4 Procedural amendment (voluntary)

Claims (1)

[Claims] In a vibration simulator that has universal joints at both ends and generates two-dimensional or three-dimensional vibrations on the vibration table using an extensible drive device, horizontal and vertical vibrations applied to the vibration table. output signals of a horizontal command signal generator and a vertical command signal generator that generate waveforms, a vertical cross signal generator that generates a signal with twice the frequency component from the horizontal vibration waveform, and the vertical command. a vertical signal synthesizer that synthesizes the output signals of the signal generator; an output signal of a horizontal cross signal generator that generates a signal with twice the frequency component from the vertical vibration waveform; and an output of the horizontal direction command signal generator. A multidimensional vibration control device includes a horizontal signal synthesizer that synthesizes signals, and a horizontal drive amplifier and a vertical drive amplifier that simultaneously generate command signals from the vertical signal synthesizer and horizontal signal synthesizer to the drive device. A vibration simulator characterized by: