JP3350830B2 - Earthquake identification method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earthquake discrimination method and apparatus for discriminating whether vibration data detected by a vibration sensor is an earthquake or a disturbance.

[0002]

2. Description of the Related Art The period of vibration due to an earthquake is approximately 0.1%.
It is said to be 1s from s. Therefore, it can be easily imagined that the period of the vibration data may be used to determine whether the vibration is an earthquake.

In the conventional earthquake discrimination method and apparatus, for example, the cycle of the sign inversion (zero cross) of the vibration data is obtained, and the discrimination between the earthquake and the disturbance is performed by using the cycle as it is.

[0004]

However, in the above-mentioned conventional earthquake discrimination method and apparatus, if there is noise intruding into the earthquake discrimination device from outside or noise transmitting inside the earthquake discrimination device, the period of the zero crossing is reduced. Are not measured correctly, and the earthquake determination is not performed correctly, and when an impact such as a ball hitting the vibration sensor is applied, it is erroneously determined to be an earthquake.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an earthquake discrimination method and apparatus which do not malfunction even with disturbance vibration such as impact or noise. Is to provide.

[0006]

In order to achieve the above-mentioned object, an earthquake discrimination method according to the present invention converts sign data inversion after converting vibration data below a predetermined threshold value to zero, Inversion time from one sign inversion to the next
Vibration data is zero during each reversal time
Only the inversion time for which the time is less than 1/2
Inversion time selected, characterized in that so as to determine the seismic when continued 3 more times upper communication.

[0007] In order to achieve the above object, seismic determination method according to the present invention, after converting the following vibration data a predetermined threshold to zero, performs detection of sign inversion, 1
Of the inversion time from one sign inversion to the next sign inversion,
The time during which the vibration data is zero during each inversion time
Only the inversion time that is less than 1/2 is primarily selected.
In the reversal time, it exceeds 0.1 second and less than 1 second.
Rolling time only selected secondary, the secondary selected inversion time, characterized in that so as to determine the seismic when continuous three times or more.

Further, in order to achieve the above object, an earthquake discriminating apparatus according to the present invention comprises a vibration detecting means for detecting vibration.
Out of the vibration data detected by the vibration detecting means.
After converting vibration data below a certain threshold to zero,
Sign inversion is detected, and one sign is inverted to the next.
Vibration data during each reversal time
Only the inversion time when the time when it is zero is less than 1/2
Select the inversion inversion time selected by the time selection means, determines that an earthquake when continuous three times or more discriminating hand
And a step .

In order to achieve the above object, an earthquake discriminating apparatus according to the present invention comprises: a vibration detecting means for detecting a vibration; After converting the vibration data to zero,
Detects sign inversion, and changes sign inversion from one sign inversion to the next
Vibration data during each reversal time
Is the inversion time when the time when is zero is less than 1/2
Primary selection, and then exceed 0.1 seconds in each inversion time
And only the reversal time that is less than 1 second is selected secondarily.
When the next selected reversal time is repeated three or more times , a discriminating means for discriminating an earthquake is provided.

[0010]

[0011]

According to the present invention, zero crossing due to noise can be eliminated, and malfunction due to disturbance vibration such as impact or noise can be prevented.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an earthquake discriminating apparatus according to the present invention, FIG. 2 is an explanatory diagram of a procedure of earthquake discrimination, and FIG. 3 is a flowchart thereof.

An earthquake discriminating apparatus according to the present invention includes a vibration sensor 1 as vibration detecting means for detecting vibration, and a microcomputer 2 as processing means for processing vibration data to determine whether the vibration is an earthquake or a disturbance vibration. And an alarm output device 3 that issues an alarm when the vibration is determined to be an earthquake.

Next, the processing procedure will be described with reference to the flowcharts of FIGS. Here, a case will be described in which earthquake determination is performed using the waveform of (1) in FIG. 2 as vibration data.

First, the vibration sensor 1 detects a vibration and inputs the vibration data to the microcomputer 2 (step n1). It is determined whether or not the vibration data input to the microcomputer 2 is equal to or smaller than the threshold value 3gal (step n2). When it is determined that the vibration data is equal to or less than the threshold value 3gal, the vibration data having the threshold value of 3gal or less is converted to 0 (step n).
3). The converted vibration data is shown in FIG. By setting the data of 3 gal or less to 0 in this manner, noise can be removed, and zero crossing due to noise can be removed. Even if the threshold value is not 3 gal, the threshold value may be a value that can remove noise in an environment in which vibration is observed.

It is determined whether the zero cross of the vibration data obtained in FIG. 2B is determined (step n).
4). In step n2, the vibration data is set to the threshold value 3g
When it is determined that it is not less than or equal to al, the process proceeds to step n4. The period of the vibration data for which the zero-cross point has been determined in step n4 is calculated (step n5), and the process proceeds to step n6.

FIG. 2 shows the vibration data for which the zero-cross point has been determined.
(3) is shown. The determination of the zero cross is made at the time when the sign is inverted except for 0. This can also remove noise. As shown in (3) of FIG. 2, seven zero crossings are observed, and the inversion time t until each zero cross is obtained.
1 to t7 are determined.

Next, in step n6, the inversion time t
Vibration data becomes zero during each inversion time from 1 to t7
At the time of inversion where the total time of
When only the interval is selected, t1 and t1 as shown in (4) of FIG.
3, t5, t6, and t7 remain. Further, when the period T is 0.1
When only zero-cross points that satisfy the range of s <T <1s are selected (step 7), t1, t5, t6, and t7 remain.

Finally, zero crossings are counted four times (A, B, C, D in FIG. 2) (step n8) as shown in FIG. 2 (5) (step n8). Since there are no zero crossings, the number of zero crossings is reset. Therefore, once at zero cross B, twice at zero cross C, and three times at zero cross D (step n9), at the time of zero cross D, this vibration is determined to be an earthquake. As a result, a signal indicating an earthquake is sent from the microcomputer 2 to the alarm output device 3, and the alarm output device 3 issues an alarm (step n10). The alarm may be a voice instruction or the like in addition to the buzzer and the siren.

Next, the effect of the present invention will be described with reference to FIG. FIG. 4A is an example of a waveform due to an impact such as when a ball hits. When the value below the threshold value of this waveform is converted to zero and the zero cross point is obtained, (2) in FIG.
As described above, there are three points where t1, t2, and t3 are the inversion times. If such an impact is repeated at a cycle of, for example, 0.1 s to 1 s, it will be determined that an earthquake has occurred in the conventional cycle-based determination.

However, according to the present invention , the oscillation is performed during each inversion time.
Time of the total is less than half the dynamic data is zero
T1 and t are selected by selecting only the inversion time
It is only 3 and does not satisfy the condition of three or more consecutive zero crossings, so it is determined to be a disturbance.

FIG. 5 (1) shows an example of an earthquake waveform. Since the waveform includes noise, if a zero-cross is detected and a cycle is obtained as it is in the conventional art, a correct cycle cannot be obtained. Is not determined. Thus, by converting the value below the threshold value to zero, the correct period of the waveform is obtained as shown in (2) of FIG.

[0023]

As described above, according to the present invention, seismic discrimination method and apparatus according to the present invention, after converting the following vibration data a predetermined threshold to zero, performs detection of sign change, vibration de
By the this to determine that an earthquake when over data time has become zero are consecutive predetermined number of sign inversion is more than 3 times smaller than the predetermined percentage, the more erroneous operation due to disturbance vibration and noise, such as precisely impact Can be prevented.

[0025]

[0026]

[Brief description of the drawings]

FIG. 1 is an overall block diagram of an earthquake discriminating apparatus according to the present invention.

FIG. 2A is a waveform diagram of vibration data. (2) is a waveform diagram of vibration data obtained by converting vibration data equal to or less than a threshold value to zero. (3) is a waveform diagram of vibration data for which a zero-cross point has been determined in the vibration data obtained in (2). (4) is a waveform diagram of vibration data in which only the data whose zero data is less than 1/2 of the inversion time until each zero cross is selected. (5) is a waveform diagram of vibration data when the sign inversion within a predetermined range of inversion time is repeated three or more predetermined times.

FIG. 3 is a flowchart of a procedure for earthquake determination according to the present invention.

FIG. 4A is a waveform diagram due to an impact such as when a ball hits. (2) is a waveform diagram of vibration data obtained by converting vibration data equal to or less than a threshold value to zero.

FIG. 5A is an earthquake waveform chart. (2) is an earthquake waveform diagram of vibration data obtained by converting vibration data equal to or less than a threshold value to zero.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration sensor (vibration detection means) 2 Microcomputer (discrimination means) 3 Alarm output device

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeaki Hiramatsu 10 Okado Dodocho, Ukyo-ku, Kyoto, Kyoto Prefecture (56) References JP-A-5-52642 (JP, A) JP-A-5-526 72003 (JP, A) Japanese Utility Model Hei 5 5-71655 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01V 1/36 G01H 1/00

Claims (4)

(57) [Claims] After converting vibration data equal to or less than a predetermined threshold value to zero, sign inversion is detected, and one sign inversion is performed.
Of the inversion time from one to the next sign inversion,
The time when the vibration data is zero is less than 1/2
Seismic determination method select only inversion time, the selected inversion time, characterized in that so as to determine the seismic when continuous three times or more. 2. After converting vibration data equal to or less than a predetermined threshold value to zero, sign inversion is detected, and one sign inversion is performed.
Of the inversion time from one to the next sign inversion,
The time when the vibration data is zero is less than 1/2
Primary selection only for a certain inversion time, and then within each inversion time
Only the reversal time that exceeds 0.1 seconds and becomes less than 1 second
2 selected order, the secondary selected inversion time is, seismic determination method is characterized in that so as to determine the seismic when continued communication over 3 times. 3. A vibration detection unit detecting vibration, of the vibration data to which the vibration detection unit detects a predetermined
After converting the vibration data below the threshold to zero,
From the sign inversion to the next sign inversion.
Vibration data is zero during each reversal time
Select only the reversal time when the
If the selected inversion time continues three times or more,
Seismic discriminating apparatus characterized by comprising: a discriminating means for discriminating the earthquake, the. 4. A vibration detection unit detecting vibration, of the vibration data to which the vibration detection unit detects, after converting the following vibration data a predetermined threshold to zero, performs detection of sign inversion, 1 From one sign inversion to the next
Of the inversion time at
Only the reversal time when the time during which
Primary selection, then over 0.1 seconds in each inversion time
Secondly, only the reversal time that is less than 1 second is selected.
-Option has been reversed time, earthquake discrimination device characterized by comprising: a discriminating means for discriminating the earthquake, the when to continue communicating over 3 times.