KR101571032B1 - Apparatus and Method for Measuring Wing Load using FRS and Elastic Body - Google Patents

Apparatus and Method for Measuring Wing Load using FRS and Elastic Body Download PDF

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Publication number
KR101571032B1
KR101571032B1 KR1020150095710A KR20150095710A KR101571032B1 KR 101571032 B1 KR101571032 B1 KR 101571032B1 KR 1020150095710 A KR1020150095710 A KR 1020150095710A KR 20150095710 A KR20150095710 A KR 20150095710A KR 101571032 B1 KR101571032 B1 KR 101571032B1
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KR
South Korea
Prior art keywords
contact
wind load
contact sensor
sensor
force
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KR1020150095710A
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Korean (ko)
Inventor
김태헌
서동우
박기태
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한국건설기술연구원
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0028—Force sensors associated with force applying means
    • G01L5/0038—Force sensors associated with force applying means applying a pushing force

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)

Abstract

The present invention relates to an apparatus and a method for measuring a wind load using an FRS sensor and a hemispherical loading device. The apparatus can measure a wind load with high precision and accuracy by maximally utilizing high measurement accuracy of the FSR sensor, by using the FSR sensor measuring a pressurization force as electrical resistance is changed in accordance with a contact area, and enabling the contact are of the FRS sensor to be changed proportional to a side of a wind load by a loading device having a hemispherical contact pressurization member.

Description

Technical Field [0001] The present invention relates to a wind load measuring device using a contact sensor and a hemispherical force measuring device, and a wind load measuring method using the same,

The present invention relates to a device capable of accurately measuring a wind load acting on a structure by being easily installed on a structure such as a bridge, and a method of measuring a wind load using the device. More specifically, The contact area of the contact sensor is changed in proportion to the size of the wind load by the force applying device including the hemispherical contact pressing member, The present invention relates to a wind load measuring device using a contact sensor and a hemispherical pulling device, and a wind load measuring method using the same, which is configured to measure a wind load with high accuracy and accuracy by making maximum use of the measurement accuracy of the contact sensor.

As a conventional technique for measuring the wind pressure acting on a structure such as a bridge or a building, that is, a wind load, there is proposed a method using a reduced scale model or a method using a wind direction anemometer, as disclosed in Korean Patent No. 10-0724752. However, in the case of this conventional technique, the wind speed is used as a basic physical quantity of wind load measurement. Since there are many factors that affect the wind speed, such as a change in density of air and a change in wind direction, It is difficult to measure reliably.

Especially, since it is advantageous to have many measurement points to measure the wind load acting on the structure, it is preferable that the wind load measuring device has a structure that can be easily installed on the structure at low cost. However, the wind load measuring apparatus proposed in the prior art has not been satisfactorily satisfied because of the complicated configuration and the high manufacturing cost.

Korean Patent Registration No. 10-0724752 (2007. 06. 07. Announcement).

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus and a method for reliably measuring a wind load directly received by a structure at low cost.

Specifically, the structure is simple and easy to manufacture, and the manufacturing cost is low. Therefore, it can be easily installed on the structure because of its light weight, and furthermore, the wind load capable of measuring the wind load acting on the structure with high reliability and accuracy, It is an object of the present invention to provide a measuring apparatus and a measuring method.

According to an aspect of the present invention, there is provided a touch sensor comprising: a touch sensor mounted on a front surface of a structure to detect a contact area and generate a measurement signal proportional to a contact area; A force device which changes the contact area of the contact sensor in proportion to the size of the wind load while contacting the contact sensor by moving in the force direction when a wind load acts on the front of the structure; And a guide member for guiding the force application device so that the force application device can move in the force direction. The device for measuring the wind load of a structure is provided.

Further, in the present invention, a contact sensor for sensing a contact area and generating a measurement signal proportional to the size of the contact area is attached and attached to the front surface of the structure in a close contact state. A guide member is provided on the front surface of the structure; When a wind load acts on the front surface of the structure, a force device for moving the contact sensor in contact with the contact sensor and changing the contact area of the contact sensor in proportion to the size of the wind load is provided, And the area is measured to calculate the wind load.

In the above-described wind load measuring apparatus and wind load measuring method of the present invention, the pressing apparatus comprises a pressure plate composed of a plate-shaped member to which wind is directly fitted, and a pressure plate having a hemispherical shape, And an urging member which is integrally provided with the pressing member; The contact pressure member is made of a material having elasticity so that when the contact pressure member is pressed and deformed when the pressure plate is moved in the direction of the contact sensor by the wind force against the wind, When the wind does not act or is weak, the contact and pressing member may have a configuration in which it is restored to the original hemispherical shape by elasticity.

In the wind load measuring device and the wind load measuring method of the present invention, the guide member may be provided with a stopper member for limiting a range in which the pressing device can move in a direction away from the contact sensor. In this case, And a channel having a ditch shape extending in a longitudinal direction in a pulling direction is formed; A clamping member is provided at an edge of the pressure plate, and the clamping member is movably coupled to the channel of the guide member; The stopper member may have a configuration in which it is fitted in the channel to block the channel.

Particularly, in the wind load measuring method of the present invention, it is possible to prevent the pressing device from moving away from the contact sensor in a state in which the contact pressure sensor of the pressure device is in contact with the contact sensor, After considering the adjustment state, a wind load may be applied to the pressure plate to measure the wind load.

According to the present invention, since the contact sensor changes the area in which the contact pressure member contacts the contact sensor by the wind load, and the contact sensor accurately measures the change in the contact area, the wind load directly received by the structure is calculated. And can be reliably measured at low cost.

Particularly, in the present invention, since the contact sensor can quickly and precisely measure changes in the contact area, the wind load measuring device of the present invention responds to wind loads very sensitively. Therefore, the wind load acting on the structure with high reliability and accuracy It becomes possible to measure.

Further, the wind load measuring apparatus of the present invention is simple in structure and easy to manufacture, and is low in manufacturing cost and light in weight so that it can be easily installed in a structure, and therefore, it is easy to install in various positions of a structure, .

1 and 2 are schematic exploded perspective views showing different directions in which a wind load measuring apparatus according to the present invention is installed on a front surface of a structure.
3 and 4 are schematic assembled perspective views showing different directions in which the wind load measuring apparatus according to the present invention is installed on the front surface of the structure.
Figure 5 is a schematic enlarged view of the circle B portion of Figure 3;
FIG. 6 is a schematic cross-sectional view in cross-section taken along the line AA in FIG. 3, showing a state in which the zero point adjusting operation is performed in the present invention.
7 is a front view of a schematic contact sensor showing the area in which the contact and pressing member is in contact with the contact sensor in the state shown in Fig.
8 is a schematic lateral cross sectional view corresponding to FIG. 6 showing a state in which a wind load is applied following the zero point adjustment state in the present invention and the pressing device moves in the direction of the contact sensor;
Fig. 9 is a front view of a schematic contact sensor corresponding to Fig. 7 showing the area in which the contact pressure member is in contact with the contact sensor in the state shown in Fig.
Fig. 10 is a schematic cross-sectional side view corresponding to Fig. 8 showing a state in which a wind load is further exerted in the present invention such that the pressurizing device moves more toward the contact sensor.
Fig. 11 is a front view of a schematic contact sensor corresponding to Fig. 9 showing the area in which the contact pressure member is in contact with the contact sensor in the state shown in Fig. 10

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

1 and 2 are schematic exploded perspective views showing different directions in which the wind load measuring apparatus 100 according to the present invention is installed on the front surface of the structure 200. As shown in FIG. FIGS. 3 and 4 are schematic perspective views of assemblies of the wind load measuring apparatus 100 according to the present invention, which are installed on a front surface of the structure 200, in different directions. In this specification, a surface facing the direction in which the wind load acts in the structure 200 is referred to as "front surface ", and a direction perpendicular to the front surface of such a structure 200, that is, , And the direction orthogonal to the pulling direction is referred to as "shear direction ".

The wind load measuring apparatus 100 according to the present invention is installed in a state of being closely attached to the front surface of the structure 200 and senses an area (contact area) in which an object is in contact and generates a measurement signal proportional to the size of the contact area (2) for changing the contact area of the contact sensor (1) in proportion to the size of the wind load in contact with the contact sensor (1) by moving in the force direction when a wind load acts, And a guide member (3) for guiding the force applying device (2) so that the device (2) can move in the force direction.

Specifically, the contact sensor 1 operates in response to the contact of an object. The contact sensor 1 senses the area that the object touches, that is, the contact area, and outputs a sensor signal that is proportional to the sensed contact area. to be. As the contact sensor 1, an FSR sensor (pressure sensitive resistance sensor) is known, and a FSR sensor is called a force sensitive resistor or a force sensing resistor. When a force is applied and a front surface is pressed, electrical resistance is changed, It has a working principle in which the signal varies. The contact sensor 1 is installed in a state in which the structure 200 is completely in close contact with the front surface for measuring the wind load.

The force applying device 2 is a member which moves in the direction of the force by the wind and changes the contact area, i.e., the contact area, of the contact sensor 1 in proportion to the intensity of the wind, that is, the wind load. Specifically, the engaging device 2 includes a hydraulic pressure plate 21 made of a plate-like member to which the wind is directly fitted, a hemispherical shape (not shown) integrally formed to protrude from the back surface of the hydraulic pressure plate 21 in the direction of the contact sensor 1, And an urging member (22). The contact pressure member 22 is made of a material having elasticity such as rubber or synthetic resin. When the pressure plate 21 winds and moves toward the contact sensor 1 in the force direction, The contact pressure member 22 is pressed and deformed while being brought into contact with the contact sensor 1 so that the area in which the contact pressure sensor 22 contacts the contact sensor 1 becomes larger. On the contrary, when the wind does not act or weakens, the contact and pressing member 22 is restored to its original hemispherical shape by elasticity.

When such a force device 2 is moved in the force direction toward the contact sensor 1 by wind or when the force device 2 moves away from the contact sensor 1 again due to a windless or small wind, Is guided in the direction perpendicular to the front face, that is, in the pulling direction.

The guide member 3 is constituted by a member elongated in the direction of the force in the front direction of the structure 200. The pressure plate 21 is coupled with the guide member 3 to be movable in the longitudinal direction of the guide member 3, To move along the guide member 3. In the embodiment shown in the drawings, the guide member 3 is formed of a beam member elongated in the pulling direction, and a channel-shaped channel 31 is formed in the beam member so as to extend in the direction of the pulling have. The clamping member 210 is provided at the edge of the pressure plate 31 so that the clamping member 210 is movably coupled to the channel 31 of the guide member 3. In this configuration, as the fastener-moving member 210 is coupled to the channel 31 of the guide member 3 and moves along the channel 31, the pressure plate 21 moves in the force direction. In particular, in the embodiment shown in the drawings, the guide members 3 are provided in pairs.

The pressing device 2 including the pressure plate 21 must be freely moved in the pressing direction to the contact sensor 1 but the pressing device 2 is excessively moved away from the contact sensor 1, It is necessary to prevent the contact sensor 1 from being brought into a state in which it does not come into contact with the contact sensor 1 at all. To this end, the guide member 3 is provided with a stopper member 32 for restricting movement of the fastening and moving member 210 in a direction away from the contact sensor 1. [ 5 shows a schematic enlarged view of the circle B portion of FIG. 3, in which a channel 31 is formed in the form of a ditch and the clamping member 210 is coupled to the channel 31 The stopper member 32 may be provided in such a manner that the stopper member 32 is inserted into the channel 31 to block the channel 31. [ When the stopper member 32 is engaged with the stopper member 32 as described above, the movable range of the clamping member 210 within the channel 31 is restricted, and the force applying device 2 is moved out of the position where the stopper member 32 is installed, The state in which the contact pressing member 22 is not in contact with the contact sensor 1 at all is prevented in principle. The engagement position of the stopper member 32 can be arbitrarily determined by the experimenter.

In the present invention, the construction in which the pressure plate 21 is moved in the force direction along the guide member 3 is not limited to the combined structure of the channel 31 and the fastening moving member 210, . ≪ / RTI >

The wind load acting on the structure 200 is measured by the following method steps using the wind load measuring apparatus 100 of the present invention having the above configuration.

First, perform a calibration operation. FIG. 6 is a schematic cross-sectional view taken along arrow AA in FIG. 3, taken in a cross-sectional side view, in a state of performing a zero adjustment operation, and FIG. 7 is a cross- There is shown a schematic front view of the touch sensor showing the area in which the member 22 is in contact with the touch sensor 1. [

6 and 7, in order to measure the wind load acting on the structure 200 using the wind load measuring apparatus 100 of the present invention, The stopper member 32 is moved to the guide member 3 so that the pressing device 2 is no longer moved away from the contact sensor 1 while the pressing member 22 is in contact with the contact sensor 1 at a predetermined area Install it. The zero point adjustment state is regarded as a state in which the wind load does not act at all. For convenience, the area in which the contact and urging member 22 is in contact with the contact sensor 1 in the zero adjustment state is denoted by S1.

Figs. 8 and 9 correspond to Figs. 6 and 7, respectively. Fig. 8 shows a state in which the wind load acts after the zero-point adjustment state and the pressing device 2 moves in the force direction toward the contact sensor 1 And Fig. 9 is a front view of a schematic contact sensor showing the area in which the contact pressing member 22 is in contact with the contact sensor 1 in the state shown in Fig. The dotted line in Fig. 8 shows the state of Fig.

When the wind load is applied to the structure 200 in the state where the zero point adjustment is completed, the pressing device 2 is guided by the guide member 3 as shown in FIG. 8 due to the force direction component force W of the wind load The contact sensor 1 is approached in the pulling direction and accordingly the area in which the contact pressing member 22 is in contact with the contact sensor 1 becomes S2 in Fig. 9 and becomes larger than S1 in Fig.

When the area of the area in which the contact pressing member 22 is in contact with the contact sensor 1 increases, the contact sensor 1 emits a measurement signal proportional to the change in the sensed contact area size. It is possible to calculate the wind pressure applied to the pressure plate 21 of the pressurizing device 2 by calculating using the measurement signal from the contact sensor 1, The wind load applied to the structure 200 can be measured.

Fig. 10 and Fig. 11 also correspond to Figs. 6 and 7, respectively. Fig. 10 shows a state in which, after the state of Fig. 8, the wind load acts more strongly and the pressing device 2 moves more in the direction of the contact sensor 1 And FIG. 11 is a front view of a schematic contact sensor showing the area in which the contact and pressing member 22 is in contact with the contact sensor 1 in the state shown in FIG. 10. The dotted line in Fig. 10 shows the state of Fig.

The pressure application device 2 is brought closer to the contact sensor 1 in the direction of the force as shown in Fig. 10 so that the contact pressure member 22 is brought into contact with the contact sensor 1, The area in contact with the sensor 1 is in the form of S3 in Fig. 11 having an area larger than S2 in Fig.

In measuring the wind load acting on the structure 200, it is very important to accurately measure the wind load acting in the force direction, not the wind load acting in the shear direction at the front face of the structure 200. In the present invention, the guide member (3) extends in the force direction, and the pressurizing device (2) is guided by the guide member (3) so as to move only in the force direction. Therefore, the pressurizing device 2 is moved only by the force in the force direction in the wind load, and the contact sensor 1 is affected only by the force direction component in the wind load. That is, in the present invention, it is possible to accurately measure only the force direction component of wind load.

In calculating the wind load from the measurement signal acquired by the contact sensor 1, a preliminary experiment in the laboratory can be used in advance. 6 and 7, a known vertical load is applied to the pressurizing device 2 to make a zero adjustment state, the measurement signal from the contact sensor 1 at that time is grasped, The change in the measurement signal of the touch sensor 1 at that time is recognized and the specifications and characteristics of the wind load measuring apparatus 100 to be used in the actual field measurement are recognized in advance. The wind load measuring device 100 having the specifications and characteristics is installed in the structure 200 in the field through the preliminary experiment and the signals measured by the wind load measuring device 100 during the wind load operation The wind load can be calculated by comparison.

According to the wind load measuring apparatus 100 of the present invention having the above configuration and the wind load measuring method of the present invention using the wind load measuring apparatus 100 according to the present invention, the area of the contact pressing member 22 contacting the contact sensor 1 is changed by the wind load, Since the contact sensor 1 accurately measures the change of the contact area, the wind load directly received by the structure is calculated based on the contact area. Therefore, the wind load can be reliably measured at a low cost.

Particularly, since the contact sensor 1 can quickly and precisely measure a change in the contact area, the wind load measuring apparatus 100 of the present invention is very sensitive to wind load, and therefore, acts on the structure with high reliability and accuracy It is possible to measure the wind load.

Further, the wind load measuring apparatus 100 of the present invention is advantageous in that it is simple in structure, easy to manufacture, low in manufacturing cost, and light in weight so that it can be easily installed in a structure.

1: Contact sensor
2:
3: Guide member
21: Hydraulic plate
22:
31: Channel
32: Stopper member

Claims (6)

A touch sensor 1 attached to the front surface of the structure 200 to detect a contact area and generate a measurement signal proportional to the size of the contact area;
A force device (2) which moves in the direction of force when a wind load acts and changes the contact area in proportion to the size of the wind load in contact with the contact sensor (1); And
And a guide member (3) for guiding the force applying device (2) so that the force applying device (2) can move in the force applying direction;
The pressing device 2 includes a pressure plate 21 made of a plate member to which the wind is directly fitted and a pressure plate 21 having a hemispherical shape and integrally formed to protrude from the back surface of the pressure plate 21 toward the contact sensor 1 And an urging member (22);
The urging member 22 is made of a material having elasticity so that when the urging member 22 is pressed and deformed when the pressure plate 21 is moved in the direction of the force sensor 1 in the direction of force application, When the outer surface of the member 22 is in contact with the contact sensor 1, the contact pressure member 22 is restored to the original hemispherical shape due to elasticity, Lt; / RTI >
The guide member 3 is formed of a beam member elongated in the pulling direction and is formed with a ditch-shaped channel 31 elongated in the pulling direction;
The clamping member 210 is provided at the edge of the pressure plate 21 so that the clamping member 210 is movably coupled to the channel 31 of the guide member 3;
A stopper member 32 (not shown) for limiting the range in which the urging member 22 can move in the direction away from the contact sensor 1 is provided to prevent the urging member 22 from coming into contact with the contact sensor 1 at all Is fitted in the channel (31) of the guide member (3) to intercept the channel (31);
The pressurizing device 2 is made not to move away from the contact sensor 1 in a state where the contact pressing member 22 of the pressurizing device 2 is in contact with the contact sensor 1, And the wind load is applied to the pressure plate (21) to measure the wind load.
delete delete delete A contact pressure member 22 having a hemispherical shape and integrally formed so as to protrude from the back surface of the pressure plate 21 in the direction of the contact sensor 1 is provided with a pressure plate 21 made of a plate- And the contact pressure member 22 is made of a material having elasticity so that when the pressure plate 21 is swung in the direction of the contact sensor 1 in the force direction by the wind, The contact pressure member 22 is brought into the original hemispherical shape by elasticity when the outer surface of the contact pressure member 22 is in contact with the contact sensor 1 and the wind does not act or weaken The guide member 3 is formed of a beam member extending in the direction of the force, and is formed with a channel-shaped channel 31 extending in the direction of the force, and the pressure plate 21, On the edge of the The clamping member 210 is movably coupled to the channel 31 of the guide member 3 and is inserted into the channel 31 of the guide member 3 by the user to move the channel The stopper member 32 is provided so as to limit the range in which the tight contact pressing member 22 can move in the direction away from the contact sensor 1, Is prevented from being in contact with the contact sensor (1) at all.
A contact sensor 1 for sensing a contact area and generating a measurement signal proportional to the size of the contact area is attached and attached to the front surface of the structure 200 in a close contact state;
A guide member 3 is installed on the front surface of the structure 200;
The pressure plate 21 and the contact pressure member 22 are moved in the direction of force along the guide member 3 when the wind load is applied to contact the contact sensor 1 and the contact area A force applying device 2 for changing a position
The contact area where the pressing device 2 contacts the contact sensor 1 is measured to calculate the wind load;
The pressurizing device 2 is made not to move away from the contact sensor 1 in a state where the contact pressing member 22 of the pressurizing device 2 is in contact with the contact sensor 1, And the wind load is applied to the pressure plate (21) to measure the wind load. delete
KR1020150095710A 2015-07-06 2015-07-06 Apparatus and Method for Measuring Wing Load using FRS and Elastic Body KR101571032B1 (en)

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KR1020150095710A KR101571032B1 (en) 2015-07-06 2015-07-06 Apparatus and Method for Measuring Wing Load using FRS and Elastic Body

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106197775A (en) * 2016-08-31 2016-12-07 新港海岸(北京)科技有限公司 A kind of pressure transducer
WO2021157797A1 (en) * 2020-02-06 2021-08-12 서울대학교 산학협력단 Wind-power integration wind-tunnel test apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003083819A (en) * 2001-09-10 2003-03-19 Wacoh Corp Force detection device using variable resistance element

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003083819A (en) * 2001-09-10 2003-03-19 Wacoh Corp Force detection device using variable resistance element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106197775A (en) * 2016-08-31 2016-12-07 新港海岸(北京)科技有限公司 A kind of pressure transducer
WO2021157797A1 (en) * 2020-02-06 2021-08-12 서울대학교 산학협력단 Wind-power integration wind-tunnel test apparatus
US11754464B2 (en) 2020-02-06 2023-09-12 Seoul National University R&Db Foundation Wind tunnel test equipment using wind force integration

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