JP2016061771A - Seismic sensing method and seismic sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic sensor and a seismic sensing method capable of detecting arrival of preliminary tremors of an earthquake to end of a surface wave which is a principal shock by one seismic sensor.SOLUTION: Provided are a seismic sensing method controlled by an acceleration sensor detecting three directions of x, y, and z and a microcomputer, determining by the microcomputer a waveform passing through a filter for determining whether a vibration is an earthquake motion or the other vibration in order to prevent malfunctioning, and outputting a result in response to an acceleration when determining an earthquake, and a seismic sensor controlled by an acceleration sensor detecting three directions of x, y, and z and a microcomputer, determining by the microcomputer a waveform passing through a filter for determining whether a vibration is an earthquake motion or the other vibration in order to prevent malfunctioning, and outputting a result in response to an acceleration to control connected equipment when determining an earthquake, and comprising a recording media recording time of output and the detected waveform.SELECTED DRAWING: Figure 1

Description

    The present invention relates to an earthquake detection method and an earthquake detector.

    Due to the occurrence of an earthquake, surface waves (S waves; long-period vibrations) are transmitted from the point of occurrence as the epicenter, which causes damage to various places, especially in high-rise buildings in remote areas, where significant rolling occurs on the upper floor. It is a problem to occur. On the other hand, a direct type earthquake is called a P wave that occurs directly under a damaged area, and damage to a building or the like immediately above is enormous.

  In addition, it has been pointed out that earthquakes that occur do not necessarily end once, but must be assumed to occur repeatedly in succession.

    Conventional earthquake detectors are not automatically restarted, and after an earthquake, inspection is complicated to restart elevators, combustion equipment, and the like connected thereto.

    The applicant of the present application has previously proposed a portable small-sized vibration measuring instrument as shown in Prior Art Document 1 below, and here provides a new method and apparatus particularly as an earthquake countermeasure.

  Registered Utility Model Gazette; Utility Model Registration No. 3159705

    The present invention uses a seismic sensor that can detect from the initial tremor (P wave) of an earthquake to the end of the surface wave (S wave), which is the main motion, with a single seismic sensor. The purpose is to provide an earthquake detection method.

    Controlled by an acceleration sensor that detects three directions of x, y, and z and a microcomputer (CPU), the CPU determines the waveform that has passed through the filter to determine the seismic motion and other vibrations to prevent malfunction, An earthquake detection method characterized by performing output according to acceleration (setting threshold) when it is determined as an earthquake, controlled by an acceleration sensor that detects three directions of x, y, and z, and a CPU to prevent malfunction. Therefore, the CPU determines the waveform that has passed through the filter to determine the seismic motion and other vibrations, and if it is determined to be an earthquake, it controls the control and control of the connected equipment by outputting according to the acceleration (set threshold). A seismic detector characterized by comprising a recording medium (SD card) for recording the time and detection waveform when the output is made and recording.

    The present invention is controlled by an acceleration sensor that detects three directions of x, y, and z and a CPU, and controls equipment connected thereto, such as elevators and combustion equipment, at the time of an earthquake. For this reason, the CPU determines the waveform that has passed through the filter for the determination of the seismic motion and other vibrations, and when it determines that the earthquake is an earthquake, the waveform is output according to the acceleration (set threshold). An SD card for recording the time when this output is made and the detected waveform is provided, and the time and scale of the occurrence of the earthquake can be verified later. It records, for example, a total of 60 seconds for 3 seconds before activation. Further, according to the present invention, an earthquake detector can be obtained in which the restart of the attached device is performed by self-recovery. This seismic detector is installed at the bottom of an elevator hoistway in a building of 60 m or less (equivalent to the 20th floor) or in a machine room of a plant, and is useful for recording earthquakes, controlling connected devices, and controlling.

  It is a block diagram of the earthquake detector of this invention.   The figure explaining the judgment (P wave) state at the time of vibration generation.   The figure explaining the judgment (P wave; initial fine movement) state at the time of earthquake occurrence.   The figure explaining the judgment (S wave; up-and-down movement) state at the time of the end of an earthquake.

  FIG. 1 is a block diagram of an earthquake detector A according to the present invention, which is housed in an appropriate case B and detects an acceleration sensor 3a [electronic type: MEMS / static] that detects three directions of x, y, and z. The electric capacity type] is connected to a CPU (earthquake determination processor) 6a to make an earthquake determination. That is, the regulator 2a is arranged in the case B from the power source outside the case B, and is connected to the CPU 6a through the acceleration sensor 3a, the amplifier circuit 4a, the filter 5a, and the like. In the figure, 7a is a relay output, 8a is a contact output, 10a is a power supply (LED), 11a is an operation display (LED), 12a is a reset input, C is an SD card, etc. Indicates a child or action. As a reset method, self-recovery continues to operate while detecting horizontal movement by earthquake determination, and turns off after falling below a threshold value after the end of vibration. Next, referring to FIG. 2, after counting the peaks 1, 2, and 3 exceeding the earthquake judgment level within a specified period (P wave; 1 to 10 Hz), the acceleration exceeding the threshold is monitored for several seconds, for example, 3 seconds. To do. Here, the output is in an OFF state as indicated by an operation state line j shown below. The earthquake judgment level is, for example, P wave 2.5Gal to prevent malfunction of impact.

  Explaining in FIG. 3, since an actual earthquake waveform (P wave; initial tremor) was detected, an earthquake was judged (dotted arrow d in the figure, after the earthquake was judged, when the output was ON), and the earthquake judgment level was exceeded here. This is an example in which a signal (relay) is activated. The period is a high period peculiar to the P wave, and the earthquake is determined within, for example, 0.5 seconds after the vibration is detected, and the operation is started. The initial tremor of the earthquake has a high period of about 7 Hz, and it can be seen that the earthquake judgment is performed at high speed.

  Referring to FIG. 4, the dotted line arrow e in the figure is below the threshold value and is at the time of final threshold detection at the time of earthquake convergence, and the dotted line arrow f in the figure is turned off when the earthquake convergence detection output is OFF, that is, after a predetermined time. It shows that. The period at the end of the earthquake is as low as about 2 Hz, and since it does not converge uniformly, the signal (relay) is turned off after a certain period of time to prevent the output from being reactivated (chattering). .

  The earthquake detection method and the earthquake detector A of the present invention are controlled by an acceleration sensor 3a that detects three directions of x, y, and z and a CPU 6a, and are connected to the earthquake detector A, such as an elevator and a combustion device. In order to prevent accidental operation, the waveform that passed through the filter 5a is monitored and determined by the CPU 6a, and the acceleration (set threshold) is determined when it is determined as an earthquake. In response, contact output is performed. An SD card for recording the time when the contact is output and the detected waveform is provided and recorded.

Industrial application fields

    The present invention is controlled by an acceleration sensor that detects three directions of x, y, and z, and a CPU, and can control equipment connected to the CPU, such as an elevator and combustion equipment, at the time of an earthquake and prevent malfunction. For this reason, the CPU determines the waveform that has passed through the filter for the determination of the seismic motion and other vibrations, and when it determines that it is an earthquake, it outputs according to the acceleration (set threshold). An SD card for recording the time when this output is made and the detected waveform is provided, and the time and scale of the occurrence of the earthquake can be verified later. The present invention provides an earthquake detector in which the restart of the attached device is performed by self-recovery, and is very convenient when using the restart. In particular, the seismic detector of the present invention is installed at the bottom of an elevator hoistway in a relatively high-rise building, a machine room of a plant, and the like, and is useful for earthquake recording, control of connected devices, control and the like.

A seismic detector B case 2a regulator 3a acceleration sensor 4a amplifier circuit 5a filter 6a CPU
7a Relay output 8a Contact output 10a LED power supply 11a LED operation display 12a Reset input C SD card

Claims (2)

    Controlled by an accelerometer that detects three directions of x, y, and z and a microcomputer to determine the seismic motion and other vibrations to prevent malfunction, the waveform that has passed through the filter is determined by the microcomputer, and the earthquake An earthquake detection method characterized in that, when it is determined, output is performed according to acceleration.     It is controlled by an acceleration sensor that detects three directions of x, y, and z and a microcomputer, and in order to prevent malfunction, the microcomputer determines the waveform that has passed through the filter to determine the seismic motion and other vibrations. A seismic detector characterized by comprising a recording medium that records the time and detection waveform when the output is controlled according to the acceleration, and controls the connected device.

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