KR101520231B1 - Method and Electronic device for measuring displacement amount of structure - Google Patents

Abstract

According to an embodiment of the present invention, a method for measuring displacement of a structure measuring dynamic displacement of a structure generated by an external load and analyzing behavior characteristics of the structure. The method for measuring displacement of a structure includes: a first step measuring acceleration corresponding to the dynamic displacement of the structure generated by the external load and processing the measured acceleration; a second step measuring the displacement of the structure generated by the external load and processing the measured displacement; and a third step deriving a progress of the displacement in accordance with time of the structure based on the processed acceleration and the processed displacement.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of measuring a displacement of a structure,

TECHNICAL FIELD The present invention relates to a displacement measurement method for a structure and an electronic device for measuring a displacement of a structure.

TECHNICAL FIELD The present invention relates to a technique for measuring dynamic displacement / deflection of bridges, civil engineering structures, and building structures. In the prior art, a displacement measurement technique using a reference point is utilized as a general technique.

The displacement measurement technique using the reference point was a method of directly measuring the displacement of the structure by setting the reference point on the lower ground of the bridge directly such as the LVDT and the potentiometer and measuring the change of the distance from the reference point to the measuring point. Such a method also includes a method of using a light wave to track the movement of the marker attached to the measurement position.

On the other hand, there is a method which does not use the reference point, integrating the acceleration measured by the accelerometer twice and estimating the uncertainty of the integral constant as an analysis result of the bridge structure.

The problems of dynamic displacement / deflection measurement of civil engineering and building structures can be summarized as follows.

end. How to use the absolute reference point of displacement measurement

Since the sensor for displacement measurement is a method of installing an absolute reference point on the bridge underground (surface exposed to the atmosphere without water) and mounting the sensor on the reference point, there is a problem that the absolute reference point can not be installed, Or if the height of the bridge is so high that it is difficult for the person to approach and work, or if the wind does not stabilize at the absolute reference point.

I. Acceleration integration method

The uncertainty of the integral constant is a problem in the method of finding the displacement by integrating the acceleration measured twice from the accelerometer at the point where the displacement is to be measured. In order to solve the uncertainty of the integral constant, the displacement structure is estimated by structural analysis of the bridge structure, and the displacement is estimated by minimizing the acceleration integral constant problem using the predicted displacement form. This method is not a direct measurement of displacement but it is an estimation method based on the analysis limited to the structure. Therefore, there may be a problem about its reliability and it is not applicable to all structures.

An object of the present invention is to provide a method and an electronic apparatus capable of effectively and reliably measuring a dynamic displacement when there is no ground on which a reference point for measuring dynamic displacement of a structure can be installed.

A method for measuring a displacement of a structure according to an embodiment of the present invention is a method for measuring displacement displacement of a structure for measuring dynamic displacement of a structure generated by an external load and analyzing the behavior of the structure, A first step of measuring the acceleration corresponding to the dynamic displacement of the structure and processing the measured acceleration; A second step of measuring a deformation amount of the structure generated by the external load and processing the measured deformation amount; And a third step of deriving a displacement of the structure with respect to time based on the processed acceleration and the processed deformation amount.

In the method of measuring a displacement amount of a structure according to an embodiment of the present invention, the acceleration is measured by an acceleration sensor, the deformation amount is measured by a strain gauge, and the measurement result of the acceleration by the acceleration sensor is And the measured value of the deformation amount by the strain gauge may be a numerical value of a deformation amount with time.

A method of measuring a displacement amount of a structure according to an embodiment of the present invention includes a step 1-1 of obtaining a numerical value of an acceleration along the time by the acceleration sensor, a Fourier transform A first step of obtaining an acceleration spectrum of the structure according to a frequency, and a 1-3 step of acquiring a displacement spectrum of the structure according to the frequency by integrating the acceleration spectrum.

A method for measuring a displacement of a structure according to an embodiment of the present invention includes a step 2-1 of obtaining a numerical value of deformation amount with time by the strain gauge and a Fourier transform of a value of deformation amount with time, And a second step 2-2 of obtaining a deformation spectrum of the structure according to Equation (2).

The method of measuring the displacement amount of the structure according to an embodiment of the present invention can derive a transition of the displacement amount of the structure with respect to time based on the displacement spectrum of the structure according to the frequency and the strain spectrum of the structure according to the frequency .

The method of measuring a displacement of a structure according to an embodiment of the present invention includes the steps of taking a range over a predetermined frequency in the displacement spectrum of the structure according to the frequency and determining a range of the strain spectrum of the structure below the predetermined frequency (3-1) of acquiring the graft displacement spectrum and inverse Fourier transform of the graft displacement spectrum to derive a transition of the displacement of the structure with respect to time.

The method of measuring the amount of displacement of a structure according to an embodiment of the present invention is a method of measuring the amount of displacement of a structure corresponding to the preset frequency so that the value of the strain spectrum of the structure is equal to the value of the displacement spectrum of the structure corresponding to the preset frequency And processing the deformation spectrum of the structure corresponding to a range below the frequency.

The predetermined frequency value of the displacement measurement method of the structure according to an embodiment of the present invention may be variable based on the acceleration sensor.

An electronic apparatus for measuring a displacement of a structure according to an embodiment of the present invention includes a display unit for measuring a displacement of a structure for analyzing a behavior of the structure by measuring a dynamic displacement of the structure generated by an external load; And a controller for receiving a numerical value of an acceleration in accordance with a time corresponding to a dynamic displacement of the structure generated by the external load from an acceleration sensor mounted on the structure, A communication unit for receiving a value of a deformation amount with time of the communication unit; And a numerical value of the acceleration according to the time and a value of the deformation amount according to the time received by the communication unit and displaying a transition of the displacement amount according to the time derived from the structure to the display unit based on the processed result And a control unit.

According to an embodiment of the present invention, the control unit of the electronic device obtains the numerical value of the acceleration with respect to the time by the acceleration sensor, Fourier transforms the numerical value of the acceleration with respect to the time, The acceleration spectrum of the structure according to the frequency is obtained, and the acceleration spectrum is integrated to obtain the displacement spectrum of the structure according to the frequency.

Measuring the displacement of a structure according to an embodiment of the present invention The control unit of the electronic device obtains a numerical value of deformation amount with time by the strain gauge and Fourier transforms the value of the deformation amount with time to calculate The deformation spectrum of the structure can be obtained.

The displacement of the structure according to an exemplary embodiment of the present invention may be determined based on a displacement spectrum of the structure according to the frequency and a strain spectrum of the structure according to the frequency, Can be derived.

The displacement of the structure according to an embodiment of the present invention may be determined by taking the range of the displacement spectrum of the structure according to the frequency to a predetermined frequency or more, Frequency can be obtained to acquire the graft displacement spectrum and inverse Fourier transform of the graft displacement spectrum can be performed to derive a transition of the displacement of the structure with respect to time.

The controller of the electronic device measures the displacement amount of the structure corresponding to the preset frequency by using the value of the displacement spectrum of the structure corresponding to the preset frequency A strain spectrum spectrum of the structure corresponding to a range below the preset frequency can be processed.

The displacement frequency of the structure according to an embodiment of the present invention may be variable based on the acceleration sensor.

The displacement measurement method and the electronic apparatus according to the present invention can measure the displacement or deflection of a civil engineering structure such as a bridge top plate without an absolute reference point.

In addition, since it is not necessary to set an absolute reference point on the structure, it is possible to measure the displacement of the bed or sea structure.

In addition, it is possible to automate the displacement measurement at the point where the manager can not access the structure, and can be utilized in the unmanned displacement monitoring system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a dynamic displacement of a structure due to an external load in a method of measuring a displacement of a structure according to an embodiment of the present invention; FIG.
Fig. 2 is a graph showing a time history of the external load F in Fig. 1; Fig.
3 is a block diagram illustrating a method for measuring a displacement of a structure according to an embodiment of the present invention.
4 is a block diagram for explaining a first step of a method of measuring a displacement amount of a structure according to an embodiment of the present invention.
5 is a graph illustrating a first step of a method of measuring a displacement amount of a structure according to an embodiment of the present invention.
FIG. 6 is a block diagram illustrating a second step of a displacement amount measurement method of a structure according to an embodiment of the present invention; FIG.
FIGS. 7 and 8 are graphs for explaining a second step of a displacement amount measurement method of a structure according to an embodiment of the present invention; FIG.
FIG. 9 is a block diagram illustrating a third step of a method of measuring a displacement amount of a structure according to an embodiment of the present invention; FIG.
10 is a graph for explaining a third step of a method of measuring a displacement amount of a structure according to an embodiment of the present invention.
11 is a view for explaining the comparison of the displacement determined by the finite element analysis and the displacement of the structure derived by the displacement measurement method of the structure according to the embodiment of the present invention.
12 is a block diagram illustrating an electronic device for measuring a displacement of a structure according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

1 is a view for explaining a dynamic displacement of a structure B by an external load F in a displacement amount measuring method of a structure B according to an embodiment of the present invention, FIG. 3 is a block diagram illustrating a method of measuring a displacement amount of a structure B according to an embodiment of the present invention. Referring to FIG.

1 to 3, a method of measuring a displacement amount of a structure B according to an embodiment of the present invention measures a dynamic displacement of a structure B generated by an external load F, A method for measuring a displacement of a structure (B) for analyzing a behavior characteristic of a structure (B), the method comprising: measuring an acceleration corresponding to a dynamic displacement of the structure (B) generated by the external load (F) (S200) of measuring a deformation amount of the structure (B) generated by the external load (F) and processing the measured deformation amount (S200), and a second step And a third step (S300) of deriving a transition of the amount of displacement of the structure (B) with time based on the amount of deformation.

Here, the dynamic displacement of the structure B generated by the external load F refers to displacement or deflection of a bridge generated when a vehicle or the like passes through a structure B such as a bridge, Is a concept that is used as a measure of the stability of

In analyzing the behavior characteristics of the structure (B) for accurate safety diagnosis evaluation of the structure (B), it is one of the most important items to measure and analyze the dynamic displacement of the structure (B).

The method of measuring the amount of displacement of the structure (B) of the present invention is characterized by measuring the amount of displacement of the structure (B) based on the acceleration and the deformation amount of the structure (B).

The data values of each step to be described below are values derived based on the time history of the external load F shown in FIG.

In addition, the block diagram shown in Fig. 3 is a diagram for overall contents in the displacement amount measuring method explained below, so that reference can be made even without special mention.

4 is a block diagram for explaining a first step S100 of a displacement amount measuring method of a structure B according to an embodiment of the present invention.

5 is a graph for explaining the first step S100 of the displacement amount measuring method of the structure B according to the embodiment of the present invention, It is a graph showing numerical value according to frequency.

4 and 5, the first step S100 is a step of measuring the acceleration corresponding to the dynamic displacement of the structure B generated by the external load F and processing the measured acceleration A first step S110 of obtaining a numerical value of acceleration with respect to time by the acceleration sensor 10, a Fourier transform of the numerical value of the acceleration along the time, (S120) of obtaining an acceleration spectrum and a 1-3 step (S130) of obtaining the displacement spectrum of the structure (B) according to the frequency by integrating the acceleration spectrum.

The first step S110 may be a step of measuring the acceleration of the structure B (see FIG. 1) generated by the external load F (see FIG. 1) The acceleration sensor 10 can measure the acceleration of the structure B generated by the external load F by installing the acceleration sensor 10 (see FIG. 1).

The measured value measured by the acceleration sensor 10 is a numerical value of the acceleration corresponding to the time when the structure B is changed by the external load F, that is, the external load F shown in Fig. 2 (a)).

In step S120, the value of the acceleration according to the time measured by the acceleration sensor 10 acquired in the step 1-1 (S110) is subjected to Fourier transform (Fourier transform) The acceleration spectrum of the structure B can be obtained (see Fig. 5 (b)).

The Fourier transform may be a Fast Fourier Transform.

The Fast Fourier Transform (FFT) is an algorithm for calculating an approximate value of a function. The Fast Fourier Transform is designed to reduce the number of operations when calculating a Discrete Fourier Transform based on Fourier Transform Since the Fourier transform is a well-known algorithm in the art, a detailed description will be omitted.

Then, the acceleration spectrum may be integrated to obtain a displacement spectrum of the structure (B) according to the frequency (S130) (refer to FIG. 5 (c)).

In general, it is possible to obtain the displacement by integrating the acceleration two times by the simple frequency domain analysis as follows.

를 푸리에 변환(Fourier Transform)에 의해 주파수영역으로 변환하였을 때의 정보를

라고 하였을 때, 변위

의 주파수 영역 변환인

은 [수학식 1]에 의해 결정된다.
Acceleration as a first step

Is transformed into a frequency domain by Fourier transform.

However,

Of the frequency domain transform

Is determined by Equation (1 ).

,

이다. 그리고 역푸리에 변환에 의해

를 시간영역으로 변환하면 [수학식 2]와 같이 변위의 시간영역 정보인

를 결정할 수 있다.
here,

,

to be. And by inverse Fourier transform

Is transformed into the time domain, the time domain information of the displacement as shown in [Equation 2]

Can be determined.

However, there are two problems with the information measured by the accelerometer.

The first problem is the uncertainty of numerical integral constants when performing integration and the second problem is that information in the low frequency band (eg 0 ~ 1Hz) close to the DC component among the information measured by the acceleration sensor 10 .

The importance of the present invention is to utilize strain measured at the same position to solve these two problems.

This will be described in detail in a second step (S200) to be described below.

FIG. 6 is a block diagram for explaining a second step S200 of the displacement amount measurement method of the structure B according to the embodiment of the present invention. FIGS. 7 and 8 are views showing a structure (S200) of the displacement amount measuring method of the second embodiment (B).

Here, FIG. 7 is a graph showing a deformation amount of a structure generated by the external load of FIG.

6 to 8, the second step S200 of the method of measuring the amount of displacement of the structure B according to an embodiment of the present invention is a method of measuring the amount of displacement of the structure B generated by the external load F, And processing the measured deformation amount.

The deformation amount of the structure B can be measured by the strain gauge 20 and it is a matter of course that a known technique can be applied as long as the deformation amount of the structure B can be measured.

In the second step S200, the strain gauge 20 may proceed to a second step (S210) of obtaining a numerical value of the deformation amount with time (see Fig. 7 (a)).

Then, in step 2-2 (S220) of acquiring the strain spectrum of the structure (B) according to the frequency by performing Fourier transform on the value of the deformation amount according to the time (refer to FIG. 7 (b) ).

The Fourier transform may be a Fast Fourier Transform.

Referring to FIG. 8, the behavior of the displacement and deformation amount of the structure B occurring at the same position appears in the same shape, but only in the absolute value thereof.

8 (a) shows the displacement of the structure B determined by the finite element analysis of the displacement of the structure B with respect to the external load F, and Fig. 8 (b) , See Fig. 1). Fig.

In other words, since the transition of the displacement of the structure (B) by the finite element analysis by the computer simulation and the mode of the strain measured by the strain gauge are similar to each other, data of the strain amount by the strain gauge is transmitted to the structure B) of the displacement amount.

Here, the finite element analysis (FEA) uses a numerical technique called a finite element method (FEM) as a computer simulation technique used in engineering analysis, and many commercially available software and free software are currently used. The detailed description of the finite element analysis is omitted because it is a general technical content used in this technical field.

Furthermore, the final acceleration information for finally determining the displacement can be determined by substituting the low frequency component characteristic of the deformation amount measured by the strain gauge into the acceleration information measured by the acceleration sensor of the low frequency band.

In other words, the measurement and processing of the deformation amount of the structure B generated by the external load F in the second step (S200) of the present invention is performed by integrating the acceleration spectrum in the first step (S100) (For example, 0 to 1 Hz), which is close to the DC component, from the uncertainty of the integral constant occurring when acquiring the displacement spectrum of the structure B according to the frequency and the information measured by the acceleration sensor 10 (E.g., 0 to 1 Hz) of the displacement spectrum of the structure according to the frequency acquired in the first step (S100) to the uncertain information in the second step (S200) Strain spectrum.

The combining of the displacement spectrum of the structure obtained in the first step S100 and the strain spectrum obtained in the second step S200 will be described in detail in a third step to be described below.

FIG. 9 is a block diagram illustrating a third step S300 of the displacement amount measurement method of the structure B according to the embodiment of the present invention. FIG. 10 is a block diagram of a structure B according to an embodiment of the present invention. (S300) of the displacement amount measuring method of FIG.

11 is a view for explaining a comparison of a displacement amount of the structure B derived by the displacement amount measurement method of the structure B according to an embodiment of the present invention and a displacement amount determined by the finite element analysis.

9 to 11, in the third step S300, the displacement spectrum of the structure B according to the frequency after the first step S100 and the frequency spectrum of the structure B according to the frequency after the second step S200 A transition of the amount of displacement of the structure (B) over time can be derived based on the strain spectrum of the structure (B).

In the third step S300, a range P of a predetermined frequency or more out of a displacement spectrum of the structure B according to the frequency is taken, and a range P of a deformation spectrum of the structure B, The third step (S310) of obtaining the graft displacement spectrum by taking the range (Q) equal to or less than the set frequency can be performed (see Fig. 10 (a)).

The numerical value of the preset frequency may be variable based on the acceleration sensor 10 of the first step S100.

Specifically, the acceleration sensor 10 for measuring the acceleration of the structure B may vary in the manufacturer, the measurement range, and the measurement method.

The range of the confidence value of the acceleration sensor 10 and the degree of the numerical value are elements dependent on the acceleration sensor 10 and are information on a range specified by the acceleration sensor 10 or known to a person skilled in the art.

In other words, the third step S300 is a step of comparing the value P of the displacement spectrum of the structure B that has undergone the first step S100 with a predetermined frequency or more and the structure B (Q) below the preset frequency to obtain the graft displacement spectrum.

In step S310, the value of the strain spectrum of the structure (B) corresponding to the predetermined frequency is set to be equal to the value of the displacement spectrum of the structure (B) corresponding to the preset frequency And processing the deformation spectrum of the structure (B) corresponding to the predetermined frequency range or less.

5 and 7, the Y-axis values of the displacement spectrum of the structure B in the first step S100 and the Y-axis values of the strain spectrum of the structure B in the second step S200 are different from each other In order to combine the displacement spectrum of the first step (S100) with the strain spectrum of the second step (S200) in the third step (S300), the displacement spectrum having different Y- Processing for equalizing the values of the strain spectrum is necessary.

In other words, the value of the strain spectrum corresponding to the preset frequency can be processed to be equal to the value of the displacement spectrum corresponding to the preset frequency.

The third step S300 may be a step S320 of performing the inverse Fourier transform of the graft displacement spectrum to derive a transition of the amount of displacement of the structure B with respect to time (See Fig. 10 (b)).

That is, if the frequency domain transform X (t) of the graft displacement is transformed into a time domain by inverse Fourier transform, x (t), which is the time domain information of the displacement, can be obtained have.

11, the displacement amount of the structure B according to the time derived from the third step is compared with the displacement obtained using Abaqus, which is a finite element analysis (FEA) program, It can be confirmed that they match.

12 is a block diagram illustrating an electronic apparatus for measuring a displacement of a structure according to an embodiment of the present invention.

Referring to FIG. 12, an electronic apparatus for measuring a displacement of a structure according to an embodiment of the present invention measures displacement of a structure by measuring a dynamic displacement of a structure generated by an external load, And may include a display unit 50, a communication unit 30, and a control unit 40.

The communication unit 30 receives a numerical value of an acceleration in accordance with a time corresponding to a dynamic displacement of the structure generated by the external load from an acceleration sensor mounted on the structure, A numerical value of the deformation amount of the structure caused by the load with time can be received.

A communication unit (30) for receiving information on the structure from the acceleration sensor or the strain gauge can receive wired or wirelessly, and can receive information about the structure from the transmission apparatus that transmits to the communication unit (30) A known technique may be applied to the communication unit 30 that receives the data.

Specifically, the communication unit 30 may include one or more modules that enable wireless communication between the electronic device and the wireless communication system or between the electronic device and the network in which the electronic device is located. For example, the communication unit 40 may include a broadcast receiving module, a mobile communication module, a wireless Internet module, a short distance communication module, and a location information module.

The broadcast receiving module receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel.

The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it can be received by the mobile communication module.

The broadcast-related information may exist in various forms. For example, an EPG (Electronic Program Guide) of a DMB (Digital Multimedia Broadcasting) or an ESG (Electronic Service Guide) of a DVBH (Digital Video BroadcastHandheld).

The broadcast receiving module receives a broadcast signal using various broadcasting systems. In particular, the broadcast receiving module may be a DMBT (Digital Multimedia Broadcasting Terrestrial), a DMBS (Digital Multimedia Broadcasting Satellite), a MediaFLO (Media Forward Link Only), a DVBH (Integrated Services Digital Broadcast Terrestrial) or the like. Of course, the broadcast receiving module may be configured to be suitable for not only the digital broadcasting system described above, but also other broadcasting systems that provide broadcasting signals.

The broadcast signal and / or broadcast related information received through the broadcast receiving module may be stored in the memory unit.

The mobile communication module transmits and receives radio signals to and from at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module refers to a module for wireless Internet access, and the wireless Internet module can be built in or enclosed in the electronic device 100. WLAN (WiFi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short-range communication module is a module for short-range communication. Bluetooth, RFID, IrDA, UWB, ZigBee, WiHD, WiGig, and the like can be used as the short distance communication technology.

The location information module is a module for confirming or obtaining the position of the electronic device. A typical example of the location information module is a GPS (Global Position System) module. According to the present technology, the GPS module calculates information on a distance (distance) from three or more satellites to one point (object), information on the time when the distance information is measured, and then trigonometry is performed on the calculated distance information It is possible to calculate three-dimensional position information according to latitude, longitude, and altitude of one point (object) in one hour. Further, a method of calculating position and time information using three satellites and correcting the error of the calculated position and time information using another satellite is also used. The GPS module 115 continues to calculate the current position in real time and uses it to calculate speed information.

The control unit 40 processes the numerical value of the acceleration according to the time and the value of the deformation amount according to the time received by the communication unit 30 and outputs the calculated value of the deformation amount to the display unit 50 The transition of the displacement of the structure over time can be displayed.

Specifically, the controller 40 acquires the numerical value of the acceleration according to the time by the acceleration sensor, performs a Fourier transform (Fourier transform) on the value of the acceleration according to the time, and calculates an acceleration spectrum of the structure And obtain the displacement spectrum of the structure according to the frequency by integrating the acceleration spectrum.

The controller 40 may acquire a deformation amount spectrum of the structure according to the frequency by obtaining a numerical value of deformation amount with time by a strain gauge and Fourier transforming the deformation amount with time.

Next, a transition of the displacement of the structure with respect to time can be derived based on the displacement spectrum of the structure according to the frequency and the strain spectrum of the structure according to the frequency.

Specifically, a range of the displacement spectrum of the structure according to the frequency is set to a predetermined frequency or more, a range of the deformation spectrum of the structure according to the frequency is taken to be less than the predetermined frequency to obtain a graft displacement spectrum, The inverse Fourier transform (Fourier transform) can be performed to derive the displacement of the structure with time.

The numerical value of the preset frequency may be variable based on the acceleration sensor. Specifically, the acceleration sensor for measuring the acceleration of the structure may be varied in the manufacturer, the measurement range, and the measurement method. The range of the confidence value and the numerical accuracy of each acceleration sensor are elements that are dependent on each acceleration sensor, It may be information on a range specified by a sensor or known to a person skilled in the art.

In addition, the control unit 40 may be configured to estimate a value of the deformation spectrum of the structure corresponding to the preset frequency to be equal to a value of the displacement spectrum of the structure corresponding to the predetermined frequency, The strain spectrum spectrum of the structure may be processed.

Meanwhile, the display unit 50 may display a time history of the external load, a numerical value of the acceleration measured from the acceleration sensor, and a numerical value of the strain measured from the strain gauge, The progress of the process and the resulting displacement of the structure over time may be displayed.

That is, the display unit 50 displays and outputs information processed in the electronic device. For example, when the electronic device is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with the call is displayed. When the electronic device 100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display unit 50 may be a liquid crystal display, a thin film transistor liquid crystal display, an organic light emitting diode, a flexible display, a 3D display ). ≪ / RTI >

Some of these displays may be transparent or light transmissive so that they can be seen through. This may be referred to as a transparent display. A typical example of the transparent display is a transparent LCD or the like. The rear structure of the display unit 50 may also be of a light transmission type. With this structure, the user can see an object located behind the terminal through the area occupied by the display unit 50 of the terminal.

In addition, there may be two or more display portions 50 according to the embodiment of the electronic device. For example, in the electronic apparatus, a plurality of display portions may be spaced apart from one another, or may be arranged integrally with each other, or may be disposed on different surfaces, respectively. Or the display unit 50 may be logically divided into two or more areas.

It is a matter of course that known techniques can be added to the display unit 50 in a method of displaying a series of calculation processes for the control unit 40 and a transition of a displacement amount with time of the final structure of the structure.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that changes or modifications may fall within the scope of the appended claims.

10: Accelerometer
20: Strain gauge
30:
40:
50:

Claims (15)

A method for measuring a displacement of a structure for analyzing a behavior of the structure by measuring a dynamic displacement of a structure generated by an external load,
A first step of measuring an acceleration corresponding to a dynamic displacement of the structure generated by the external load and processing the measured acceleration;
A second step of measuring a deformation amount of the structure generated by the external load and processing the measured deformation amount; And
And a third step of deriving a displacement of the structure with respect to time based on the processed acceleration and the processed deformation amount.
The method according to claim 1,
Wherein the measurement of the acceleration is implemented by an acceleration sensor, the measurement of the amount of deformation is implemented by a strain gauge,
Wherein the measurement result of the acceleration by the acceleration sensor is a numerical value of acceleration with time and the measurement result of the strain amount by the strain gage is a value of the strain amount with time.
3. The method according to claim 2,
A first step of obtaining a numerical value of the acceleration according to the time by the acceleration sensor, a first step of obtaining a numerical value of the acceleration according to the time, a Fourier transform of the numerical value of the acceleration according to the time, And a third step of integrating the acceleration spectrum and the displacement spectrum of the structure according to the frequency to obtain the displacement spectrum of the structure.
4. The method according to claim 3,
A second step of obtaining a numerical value of deformation amount with time by the strain gauge and a second step of obtaining a deformation amount spectrum of the structure according to a frequency by Fourier transforming the value of deformation amount with time, And measuring the displacement of the structure.
5. The method according to claim 4,
And deriving a transition of the displacement of the structure over time based on a displacement spectrum of the structure according to the frequency and a strain spectrum of the structure according to the frequency.
6. The method according to claim 5,
A third step of obtaining a graft displacement spectrum by taking a range over a predetermined frequency in the displacement spectrum of the structure according to the frequency and taking a range of the strain spectrum of the structure according to the frequency to be less than the preset frequency, And (3-2) deriving a transition of the displacement of the structure with time by inverse Fourier transforming the graft displacement spectrum.
7. The method of claim 6,
The deformation spectrum of the structure corresponding to the predetermined frequency or less is processed so that the numerical value of the deformation spectrum of the structure corresponding to the predetermined frequency becomes equal to the numerical value of the displacement spectrum of the structure corresponding to the preset frequency And measuring the displacement of the structure.
7. The method according to claim 6,
And a displacement amount of the structure is variable based on the acceleration sensor.
An electronic device for measuring a displacement of a structure for measuring a dynamic displacement of a structure generated by an external load and analyzing the behavior of the structure,
A display unit;
And a controller for receiving a numerical value of an acceleration in accordance with a time corresponding to a dynamic displacement of the structure generated by the external load from an acceleration sensor mounted on the structure, A communication unit for receiving a value of a deformation amount with time of the communication unit; And
A control unit for processing the numerical value of the acceleration according to the time received by the communication unit and the numerical value of the deformation amount according to the time and displaying the transition of the deformation amount according to the time derived from the structure, A displacement measuring device for measuring a displacement of the structure including the electronic device.
10. The method of claim 9,
Wherein,
Acquiring a numerical value of the acceleration according to the time by the acceleration sensor, Fourier transforming the numerical value of the acceleration according to the time to obtain an acceleration spectrum of the structure according to the frequency, integrating the acceleration spectrum, Measuring the displacement of the structure to obtain the displacement spectrum of the structure according to the frequency.
11. The method of claim 10,
Wherein,
Wherein the strain gauge acquires a numerical value of a deformation amount with time and Fourier transforms a value of the deformation amount with time to obtain a deformation spectrum of the structure according to a frequency.
12. The method of claim 11,
Wherein,
And deriving a transition of the displacement of the structure with time based on a displacement spectrum of the structure according to the frequency and a strain spectrum of the structure according to the frequency.
13. The method of claim 12,
Wherein,
Wherein the gravity displacement spectrum is obtained by taking a range of a displacement spectrum of the structure according to the frequency over a predetermined frequency and taking a range of the strain spectrum of the structure according to the frequency to be less than the predetermined frequency, A displacement measuring apparatus for measuring a displacement of a structure that derives a displacement of a structure with time by inverse Fourier transform.
14. The method of claim 13,
Wherein,
The deformation spectrum of the structure corresponding to the predetermined frequency or less is processed so that the numerical value of the deformation spectrum of the structure corresponding to the predetermined frequency becomes equal to the numerical value of the displacement spectrum of the structure corresponding to the preset frequency Displacement measuring electronic device.
14. The method of claim 13,
The numerical value of the pre-
And a displacement amount of a structure that is variable based on the acceleration sensor.

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