JPS6035276A - Correlative inspection processing system - Google Patents

Abstract

PURPOSE:To achieve a correlative inspection processing free from the effect of noise components by inspecting the correlation with the reference pattern depending on frequency components of various electric signals or the detection signal of the shape, vibration or the like of an object to be inspected. CONSTITUTION:The vibration of a structure is detected with a sensor 1 and applied to a detection signal processing circuit 2, which transfers the detection signal for a specified period to a high-speed Fourier transform circuit 3 based on the transformation end signal from the circuit 3. The frequency component of a hazardous vibration predetermined is memorized into a memory circuit 4 as fixed pattern and the frequency component transformed with the circuit 3 and the frequency component signal from the circuit 4 are applied to a difference counting circuit 5. The counting output signal is compared with the reference value by a comparator circuit 6. When the counting output signal is smaller than the reference value, a warning signal is outputted from the comparator 6 to indicate that the structure is under the hazardous vibration or the level close thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a correlation test processing method for testing the correlation between various electrical signals or detection signals such as the shape or vibration of an object to be tested and a reference pattern.

Prior Art and Problems When inspecting the earthquake resistance of a building, it is common to install seven sensors in the building, record the detection signal waveform of the sensor, and analyze the recorded waveform. It was not possible to determine whether or not the building was in a dangerous vibration state. In general, in order to capture the characteristics of a detection signal, there are a method of determining whether there is a portion above a certain level, a method of comparing the waveform with a reference pattern, etc. The former method makes on/off decisions, and has the disadvantage that it is not possible to see the characteristics of the overall waveform. Furthermore, the latter method has the disadvantage that when noise components are mixed into the detection signal, it is difficult to verify the similarity with the reference pattern.

Purpose of the Invention The present invention tests the correlation with the base Yla pattern using the frequency components of various electrical signals or detection signals such as the shape and vibration of the test object, and performs correlation d test processing without being affected by noise components. The purpose is to make it possible to do the following.

Structure of the Invention The present invention provides a method for testing the correlation between a transmitted electrical signal or a detection signal such as the shape or vibration of an object to be tested and a reference pattern, in which the electrical signal or detection signal is Fourier-transformed into frequency components. a conversion circuit that stores the reference pattern as a frequency component; and a difference counting circuit that counts the difference between the reference pattern successively output from the memory circuit and the output signal of the conversion circuit. The present invention is characterized in that the count output signal is compared with a predetermined reference value to test the correlation with the reference pattern.Examples will be described in detail below.

Embodiment of the invention FIG. 1 is a block diagram of main parts of an embodiment of the invention.
This is for testing whether vibrations in buildings are dangerous vibrations or not. Also, Figure 2+a) and (b) are
An example of a reference spectrum and a measurement spectrum used in the example shown in the figure is shown. The vibration of the building is detected by the sensor 1, and the detection signal is applied to the signal processing circuit 2. Based on the conversion completion signal from the fast Fourier transform (FFT) circuit 3, the signal processing circuit 2 processes the detection signal for a predetermined period. The data is transferred to the fast Fourier transform circuit 3. The fast Fourier transform circuit 3 is composed of a well-known arithmetic circuit, and converts a detection signal on the time axis into a signal on the frequency axis, that is, a frequency component as shown in FIG. , the frequency components of dangerous vibrations are recorded in advance as a fixed pattern as shown in FIG. component signals are applied to the difference counting circuit 5.

The difference counting circuit 5 calculates the difference between each frequency component signal, counts the difference, and outputs the difference.The counted output signal is compared with a reference value in the comparison circuit 6. Since the small count output signal of the difference counting circuit 5 indicates that the slow motion of the building is close to dangerous vibration, the reference value of the comparison circuit 6 is set to a value that takes into account the permissible range. If the count output signal is smaller than the standard value, the comparator circuit 6 outputs an alarm signal indicating that the building is in dangerous vibration or close to it.Therefore, the dangerous state of the building can be determined in real time. It becomes possible to output an alarm. Figure 2 (b)
In the case of the measured spectrum shown in 1, the vibration of the building in the dangerous frequency band is large, so the above-mentioned count output signal becomes smaller than the reference value, indicating that the building is dangerous.

In this way, whether or not there is a large correlation with dangerous vibrations is determined by comparing frequency components, and the influence of noise is small, making it possible to easily determine the dangerous vibration state of a building during an earthquake. It is also possible to forcibly apply vibrations to a building and determine whether the vibration detection signal is similar to dangerous vibrations of, for example, an earthquake-resistant building.

The above-mentioned embodiment detects vibrations in buildings and tests whether there is a large correlation with dangerous vibrations, but it also detects vibrations in machines, etc. and identifies machine failures as inevitable vibrations. Based on the correlation of , the occurrence of a failure can be determined and the failure +17. ] It is also possible to determine where. Further, it is possible to check the correlation between the waveforms and frequencies of electrical signals between transmission lines or circuit parts by counting the difference from the reference pattern in the same way as described above to determine whether the waveforms and frequencies are the desired waveforms and frequencies.

It is also possible to test the similarity of the shapes of objects, for example, in Figure 3 (81 is the reference cross section of the object and (bl is the cross section of the object to be tested), these cross sections are optically or electrically Since it can be read by scanning, a detection signal with a waveform corresponding to the cross-sectional shape can be obtained.As mentioned above, by correlating the frequency components of this detection signal, the manufacturing accuracy of the object to be tested can be determined. For example, if the difference in high frequency components is large, there will be a difference in small shape changes, and if the difference in low frequency components is large, there will be differences in shape changes in relatively large uneven parts. In this way, by examining the difference in frequency components i and J in response to frequency, it is also possible to determine the similarity of shapes in detail <1'.

As described in detail, since the present invention performs comparison with a reference pattern based on frequency components, it is possible to perform comparisons excluding noise components outside a predetermined frequency range. Since the correlation between the shape of an object, vibration condition, etc. and the reference pattern can be easily verified, this method can be used to determine dangerous vibration conditions, similarity of objects, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of an embodiment of the present invention, and FIG. 2 (
al, (bl is a reference spectrum and measurement spectrum used in the embodiment of FIG. 1, FIG. 3+al, (bl is an explanatory diagram of another embodiment of the present invention. 2 is a sensor, 2 is a signal processing circuit, 3 is a fast Fourier transform circuit, 4 is a memory circuit, 5 is a difference counting circuit, and 6 is a comparison circuit. Patent applicant: Fujitsu Ltd. Representative Patent Attorney Akio Aitani Representative Patent Attorney Hiroshi Watanabe -

Claims (1)

[Claims] In a method of testing the correlation between a transmitted electrical signal or a detection signal such as the shape or vibration of an object to be tested and a reference pattern,
a conversion circuit that Fourier transforms the electric signal or detection signal into frequency components; a memory circuit that stores the reference pattern as a frequency component; and a difference between the reference pattern read from the memory circuit and the output signal of the conversion circuit. 1. A correlation test processing method, comprising: a difference counting circuit; the counting output signal of the difference counting circuit is compared with a predetermined reference value to test the correlation with the reference pattern.