JPH0810184B2 - Waveform generator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a waveform generator that generates various test waveforms required for static tests and fatigue tests in the field of material testing.

[Prior Art] A conventional generator for a test waveform or the like stores pattern data of a predetermined test waveform in a storage unit in advance,
The necessary pattern data was read to generate the waveform signal.

[Problems to be Solved by the Invention] Since conventional generators for test waveforms and the like have fixedly stored the necessary waveform data in advance as described above, arbitrary waveforms other than the waveforms stored during the test are stored. However, there is a problem that a pseudo test of a material and a simulation test of an actual environment cannot be performed.

[Means for Solving Problems] The present invention adopts the following configuration in order to solve the above problems.

That is, the waveform generator according to the present invention divides an output waveform set arbitrarily with a basic waveform storage unit that stores waveform pattern data for each half cycle of a basic repetitive waveform, and divides the divided output waveform at the change point. The amplitude value, which is the oscillation condition for each divided waveform of the output waveform, based on the waveform data indicating the start and end points for each waveform and the time, etc.
Calculation means for calculating the average value, frequency division ratio, etc., storage means for sequentially storing the oscillation conditions calculated by the calculation means as a waveform data table, and basic waveforms for each half cycle stored in the basic waveform storage means. Waveform output means for sequentially setting data for each half-waveform according to the waveform data table stored in the storage means and outputting as a set waveform signal, and a circuit for holding the half-waveform output sequentially output from the waveform output means And a continuous waveform output means for outputting the half waveform output as a continuous waveform.

[Operation] The output waveform that is set arbitrarily is once divided for each change point, and the oscillation conditions such as the amplitude value, average value, and division ratio for each divided waveform are obtained, and stored in advance according to this oscillation condition. Select a waveform for each half cycle of the basic repetitive waveform, and set the selected basic waveform of the half cycle one after another so that the waveform pattern is divided, and connect the waveforms that are set and output sequentially. However, since it is output as a continuous waveform that has been smoothed so as not to cause a transient change, it is possible to obtain an output waveform according to an arbitrarily set waveform.

[Embodiment] FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. In the device of the embodiment, the pattern data of the basic waveform is stored in the waveform pattern memories 12 and 13, and the basic waveform pattern is set according to the oscillation condition and sequentially connected and output as a continuous waveform as will be described later. It is configured to generate a waveform.

The setting condition of the basic waveform is obtained by arithmetically processing the data of the arbitrary waveform input from the input display unit 1 by the computer unit 2. For example, when generating an arbitrary waveform as shown in FIG. 2 (a), data such as the start point, end point, and divided time interval of the divided waveform divided at each change point (P _{o to} P ₁₀ ) of the waveform are input. It In the figure, 10 channels divided into 10 channels are input. If the illustrated one channel, the start point P _o, by entering the time t ₁ from the final arrival point P _1, P _o to P _1, the waveform amplitude = P ₁ -P _o, mean = (P ₁ -P _o ) / 2, division ratio = n / (CL
OCK × t ₁ ) (n: the number of divisions of the wave pattern) is calculated in the computer unit 2, and the oscillation condition of the waveform is obtained. Further, the basic waveform is selected according to the pattern change of the divided waveform. Waveform pattern memories 12 and 13 have C
Half-wave pattern data of OS0 ° -180 ° and COS180 ° -360 ° is stored as complementary offset binary data whose time axis is the address of the memory, and the one that corresponds to the waveform pattern of each channel To be selected. In this way, the data for the required channels are sequentially input, the end code is added to the last channel, and the waveform data table shown in Table 1 is created based on the above-described arithmetic processing and stored in the computer unit 2. To be done.

The computer section 2 gives a setting command to each section according to the waveform data table. The frequency division ratio data is set in the register 11 by the computer unit 2, and the frequency divider 7 and the counter 8 are set. Waveform pattern memory 12,1
3 is also selected for each channel by the register 11 by the selection code of the data table. The waveform data read from the selected memory is converted to analog waveform data by the D / A converter 15. The amplitude of this waveform data is set in the register 11 and output via the D / A converter 16. The determined amplitude value is determined. Also, the D / A converter 15
An average value set in the register 11 and output via the D / A converter 17 is added to the analog waveform signal output from the adder 19 by the adder 19. These amplitude signal A, average signal B
The respective waveforms of are shown in FIG. 2 (b) and (c).

The waveform signal for each half waveform output from the adder 19 is input to the track and hold circuit 20 and output as a continuous waveform. That is, first, in channel 1, the track and hold circuit 20 is held, the waveform pattern memory 12 is selected, the counter 8 is cleared, and the frequency divider 7 and the D / A converter 16 are assigned to the frequency divider 7 and the D / A converter 16 according to the data table. Amplitude value, D
Set the average value to the / A converter 17 and set the track / hold circuit 20 to the track. Here, when a start command is sent to the flip-flop 6 to enter the set state, the clock signal output from the clock oscillator 4 is input from the opened gate 5 to the frequency divider 7 and stored in the memory according to the frequency division ratio.
Twelve addresses are performed and the basic waveform stored in memory 12 is read. The read data is transformed according to the amplitude value average value set as described above, and is output from the output terminal 21 as the waveform signal C.

When the pattern reading from the waveform pattern memory 12 is completed, the gate 9 detects it and interrupts the computer section 2 to reset the flip-flop 6. When reset, the gate 5 is closed and the output signal is in the hold state. The computer section 2 is a track
Holds the hold circuit 20 and holds the waveform pattern memory
Select 13. Next, set the division ratio, amplitude value, and average value according to the data of 2 channels of the waveform data table,
The track-hold circuit 20 is returned to the track, the flip-flop 6 is started to set, and the interrupt is exited. By repeating this process, up to 10 channels are processed, and the loop from channel 1 to channel 10 is repeated to continuously transmit the arbitrary waveform shown in FIG.

The timing when setting the waveform of the next channel in the above is shown in FIG. In the same figure, the P section shows the output when the track and hold circuit 20 is not provided, but by passing the analog signal after D / A conversion to the track and hold circuit 20, the waveform when the oscillation waveform condition is set again Smoothing is performed to prevent over-fatigue changes at the connection points. As described above, in the apparatus of the embodiment, the stored COS 0 ° -18
Based on the two half-waveforms of 0 ° and COS 180 ° -360 °, the division ratio, amplitude value, average value, etc. corresponding to the divided waveform divided at each change point of the waveform to be output are obtained, and the oscillation condition is obtained. Set the half waveform according to the above, connect the half waveforms that are output according to the settings, and output as a continuous waveform that has been smoothed so that no transient changes occur. Any waveform signal can be output by setting.

In the above embodiment, the stored basic waveform is a cosine wave that crosses positive and negative, but it can be used as a positive signal and a negative signal including an offset level as shown in FIGS. Good. The basic waveform is not limited to the cosine wave, and a convenient one may be arranged and set. In addition, although a track and hold circuit was provided in consideration of the over-fatigue change when switching the waveform channel, if the over-fatigue phenomenon is extremely fast, a low-pass filter may be used instead to smooth the output waveform. it can.

In the embodiment, the setting of the waveform condition is input by the keyboard, but it can also be input by a digitizer or the like via the interface section of the computer, and can be input easily. Also, since the basic waveform signal is handled as a digital signal, the operation is stable, but it has a wide range of applicability due to the configuration that applies the CPU, especially the application performance can be expanded by software, and waveforms other than the test (for example, It can also be applied to the generation of waveforms required for analytical measurement.

[Effects of the Invention] As is apparent from the above invention, according to the waveform generating apparatus of the present invention, various waveforms can be arbitrarily generated, and a material similarity test and a real environment simulation test can be easily performed. I was able to do it.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a diagram showing (a), (b) and (c) showing output waveforms and operation waveforms of each part, and FIG. 3 is a timing chart showing setting timing of each part. 4 (a) and (b) are diagrams showing modified examples of the basic waveform. 1 ... Input / display section, 2 ... Computer section 4 ... Clock pulse oscillating section 7 ... Frequency divider, 12,13 ... Memory for waveform pattern 15,16,17 ... D / A converter, 19 ...... Adder 20 …… Track and hold circuit

Claims (1)

[Claims] 1. A basic waveform storage means for storing waveform pattern data for each half cycle of a basic repetitive waveform, an arbitrarily set output waveform, divided at a change point, and a start point for each divided waveform and Calculation means for calculating an amplitude value, an average value, a division ratio, etc., which are oscillation conditions for each waveform obtained by dividing the output waveform by the waveform data indicating the end point, time, etc., and the oscillation condition calculated by the calculation means are waveform data. Storage means for sequentially storing as a table, and basic waveform data for each half cycle stored in the basic waveform storage means are sequentially set for each half waveform according to a waveform data table stored in the storage means, and the set waveform signal And a circuit for holding the half-wave output that is sequentially output from the waveform output means, and the half-wave output is a continuous waveform. Waveform generating apparatus characterized by comprising a continuous waveform output means for outputting.