KR19990034094A - Seismic analysis system - Google Patents

Abstract

The present invention relates to an earthquake wave measurement and analyzer, comprising: an analog input unit for receiving vibrations of the ground and a structure from an accelerometer (earthquake sensor), a converter (ADC) for converting the analog acceleration values received from the input unit into digital, and a conversion unit Generates the history file and calculates the maximum and minimum values from the negative conversion, changes the frequency into the frequency domain using the time history, calculates which frequency is excellent, and calculates the response spectrum to compare with the design value. The controller calculates the accumulated absolute speed and analyzes it to determine the damage level of the structure.The controller reflects the key input value that adjusts the gain when the analog input value is input from the input part, and the various set values of the seismic wave analysis system. Key input unit to change the display, and display unit to display the status of the seismic analysis system (LCD ) Can be installed at the site where the seismic sensor is installed to evaluate the effect on the structure during the earthquake.

Description

Seismic analysis system

The present invention relates to a seismic wave analysis system, and in particular, each field with an earthquake sensor to be analyzed immediately converts the value read through the ADC into time history acceleration, Fourier spectrum, power spectrum, response spectrum, absolute cumulative velocity, A seismic wave analysis system for calculating the effect on this structure.

To date, methods for evaluating the impact of earthquakes on structures have been used to analyze the contents recorded in the mechanically operated response spectrum recorder and to analyze the Fourier Spectrum calculated by the analysis system.

However, the above-described conventional analysis methods have limitations in evaluating the effect on the structure since only the maximum value, the curve of the frequency component, and the response spectrum of the earthquake are obtained. As described above, the conventional analysis method cannot be evaluated within a predetermined time, so that there is a problem in that it is limited in the rapid earthquake preparedness.

In order to overcome the limitations of the above-described analysis equipment of the WHD, the present invention converts the value read through the seismic sensor in each site to be analyzed directly into time history, Fourier spectrum, power spectrum, response spectrum, absolute cumulative speed, etc. To provide a seismic analysis system that can compare design and calculated values in real time.

The seismic wave analysis system provided by the present invention includes an analog and digital input unit for receiving an acceleration value for three axes in a three-axis accelerometer (earthquake detection sensor), a converter (ADC) for converting an analog value received from the input unit into a digital unit, and After initializing the seismic wave analysis system, a program such as a time history or a Fourier spectrum, a power spectrum, a response spectrum, an absolute cumulative speed, a change in a set value, and a control unit for properly controlling externally inputted values, It consists of a key input unit that inputs the use of analog or digital input point or multiplier when converting analog to digital, port use, pretrigger buffer setting, etc. to the control unit, and a display unit to display the operation status of the control unit. Install and carry and carry out seismic analysis.

1 is a block diagram of a seismic wave analysis system according to an embodiment of the present invention;

2 is a block diagram of a processor architecture of the present invention;

3 is a block diagram of a memory map of the present invention;

4 is a block diagram of a system for digitally converting an analog of the present invention;

5 is a block diagram of a digital input unit configuration of the present invention;

6 is a block diagram of a digital output unit configuration of the present invention;

7 is an external view of the present invention.

* Explanation of symbols for main parts of the drawings

110: accelerometer (earthquake sensor) input unit 120: conversion unit (A / D)

130: power management unit 140: control unit (CPU)

150: input unit 160: display unit (LCD)

210: central processing unit 220: DM

310: dynamic ram 320: static ram

330: Real Time Clock 340: Rom

410: input buffer 420: filter

430: multiplexer 440: input amplifier

450: analog-to-digital converter 510: input voltage divider

520: optical coupling element 530: noise cancellation circuit

540: status display LED 610: data latch

620: optical coupling element 630: open collector circuit

640: Status Display LED

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a seismic wave analysis system according to an embodiment of the present invention, FIG. 2 is a block diagram of a processor structure used in the present invention, FIG. 3 is a block diagram of a memory map used in the present invention, 4 is a block diagram of a system for converting analog to digital used in the present invention, FIG. 5 is a block diagram of a digital input unit used in the present invention, and FIG. 6 is a block diagram of the output unit structure of the present invention. 7 is an external view of the present invention.

Referring to FIG. 1, the seismic wave analysis system provided by the present invention converts an analog and digital input unit receiving an acceleration value for three axes from a three-axis accelerometer (earthquake detection sensor) and converts the analog value received from the input unit into a digital XKF. After initializing the conversion unit (ADC) and the seismic wave analysis system, a program such as time history or Fourier spectrum, power spectrum, response spectrum, absolute cumulative speed, change of set value, and the like can be properly controlled. A control unit, a key input unit for inputting the use of an analog or digital input point of the seismic wave analysis system or a multiplication value when converting an analog to digital, a port use, a pretrigger buffer setting, and the like, and an operation state of the control unit. And a power management unit for supplying power to the field sensor and the control unit.

Referring to FIG. 2, the processor structure used in the present invention includes a central processing unit 210 that oversees the entire system, a DM controller 220 for simultaneously performing input / output operations with the central processing unit.

Referring to FIG. 3, the memory map used in the present invention is mainly used to store input data. The main data is dynamic for storing data from an analog-digital / conversion device or analyzing data from a host computer before analysis. RAM 310, a static RAM 320 that can be operated at high speed in response to the high-speed operation of the central processing unit, mainly used for analyzing data, and an ROM in which an operating program for operating the system is embedded. ), The main purpose is to store the necessary configuration data for the system. It is used to maintain the system's time. The year is displayed in two units, and the real time clock displays the month, date, hour, minute, and second. It consists of 330.

Referring to FIG. 4, the input buffer 410 of the apparatus for converting analog into digital used in the present invention serves to convert the differential input signal into a single-ended signal and to insulate the external signal from the analog digital system. In addition, the filter 420 is composed of a second-order low pass filter, performs an offset adjustment generated in the analog system, and the multiplexer 430 selects one of the 16 input channels and performs a central operation. Select the current channel to input to the analog-digital system according to the command of the device, the input amplifier 440 amplifies the output signal of the multiplexer to the analog-digital system and selects the gain appropriately according to the size of the input signal. The digital conversion system 450 finally receives the analog signal, converts it into a digital signal, and centralizes the data. And performs a function that is passed to the device.

Referring to Figure 5, the digital input unit and the input voltage divider 510 used in the present invention is a circuit for adjusting the input range so that the input voltage is used from +5 (V) to +24 (V), optical coupling device 520 is an element for separating an external signal from the system, and by using an optical coupling element, the signal level can be easily connected with other circuits and can be connected with various output circuits, and the noise canceling circuit 530 is a digital signal. It was added to prevent the malfunction due to the noise contained in, and the status display LED 540 is attached to check the current input state.

Referring to FIG. 6, the digital output unit used in the present invention includes a data latch unit 610 for storing digital data from the central processing unit, an optical coupling element 620 used to separate the system from the outside, and the final unit. As an output circuit, an open collector circuit 630, which is a part for driving an external circuit, and a status display LED 640 attached to check a current output state.

On the other hand, the external key input unit can see the current operating status, and is equipped with a display unit for checking various set values, and simply checks the function of the seismic wave analysis system even when there is no upper system, and changes necessary set values. Can be.

The external signal input method to seismic wave analysis system is similar to general data collection system. When the accelerometer is installed on the ground and the structure to measure, the change of electromotive force caused by vibration is detected.

The input acceleration time histories analyze the Fourier Spectrum of seismic waves by the formula (1), the power spectrum is analyzed by the formula (2), the response spectrum is analyzed by the formula (3), and the absolute cumulative velocity is the theoretical formula ( Analyze seismic waves by 4).

By using the present invention as described above, by calculating the comparison with the time history, Fourier spectrum, power spectrum, response spectrum, absolute cumulative speed, design value of each value read through the 3-axis accelerometer (earthquake sensor) at each site, When an earthquake occurs, you can take action after the earthquake as soon as possible.

Claims (2)

In an earthquake analysis system for measuring and analyzing seismic waves, a three-axis accelerometer (earthquake sensor) inputs an input unit for receiving three-axis acceleration values and a digital value input from a trigger, and converts an analog acceleration value input from the input unit into a digital value. After initializing the conversion unit (ADC) and the seismic wave analysis system, programs such as time history or Fourier spectrum, power spectrum, response spectrum, absolute accumulation speed, setting value change, and the like can be properly controlled. A control unit, a key input unit for inputting the analog, digital input point of the seismic wave analysis system or a variable value to be multiplied when converting the analog to digital, a port use, a pretrigger buffer setting, and the like, and an operation state of the control unit. Seismic analysis system for measuring and analyzing seismic waves at each site, including a display unit . The method according to claim 1, wherein the control unit analyzes the acceleration value received from the triaxial accelerometer using the equation (1), the Fourier spectrum of the seismic wave, the power spectrum is analyzed by the formula (2), the response spectrum is the theoretical formula (3 Seismic wave analysis system which analyzes seismic waves by the following formula (4).