CN111023958B - Method for measuring displacement response of explosion test structure - Google Patents

Method for measuring displacement response of explosion test structure Download PDF

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Publication number
CN111023958B
CN111023958B CN201911343149.9A CN201911343149A CN111023958B CN 111023958 B CN111023958 B CN 111023958B CN 201911343149 A CN201911343149 A CN 201911343149A CN 111023958 B CN111023958 B CN 111023958B
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displacement
contact pin
data
time point
acquisition instrument
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CN111023958A (en
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钱海敏
宗周红
李明鸿
甘露
林津
潘亚豪
杜孟林
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Southeast University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
    • G01N3/313—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by explosives
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0212—Theories, calculations
    • G01N2203/0218—Calculations based on experimental data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a method for measuring structural displacement response of an explosion test, which comprises the following steps: (1) manufacturing a contact pin; (2) mounting a contact pin; (3) when each contact pin is contacted with the structure, point acquisition and data transmission are carried out; (4) the structure displacement is displayed and stored. The invention can save cost and ensure the accurate measurement of the displacement data of the explosion test.

Description

Method for measuring displacement response of explosion test structure
Technical Field
The invention relates to the technical field of displacement response measurement, in particular to a method for measuring the displacement response of an explosion test structure.
Background
In structural antiknock testing, displacement data of a structure is the data of most concern to researchers. The traditional explosion test structure displacement measurement mainly adopts a mechanical or laser displacement sensor, is connected with a collecting instrument, and converts the current and voltage changes of the displacement sensor to obtain a displacement value, so that certain errors exist in the displacement value. In addition, when the explosive explodes, an electromagnetic field with certain intensity can be generated in a certain range of an explosion point, and the current or voltage value of the displacement measurement system can be influenced, so that the converted displacement value contains more unreal components, and the displacement measurement error is further increased. Therefore, it is desired to solve the above problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for measuring the displacement response of an explosion test structure, which can save cost and ensure the accurate measurement of the displacement data of the explosion test.
In order to solve the technical problem, the invention provides a method for measuring the displacement response of an explosion test structure, which comprises the following steps:
(1) manufacturing a contact pin; designing the length of the contact pins according to the measuring point positions of the structure to be measured, and manufacturing n contact pins;
(2) mounting a contact pin; the contact pins are connected with a lead at the tail end, n contact pins are inserted into the base to form a circular array, and each contact pin has different distances from the structure and represents different displacement values x of the structureiWherein i is 1, 2, 3 … … n; connecting n leads connected with the contact pins into each channel of the acquisition instrument, spraying conductive paint on the surface of a structural measuring point, and leading out leads to be connected into the acquisition instrument; connecting the explosion initiator to an acquisition instrument; connecting the portable computer with the acquisition instrument through an optical fiber or a USB connecting wire;
(3) when each contact pin is contacted with the structure, point acquisition and data transmission are carried out; the point of pressing the initiator is the zero time point of data acquisition, when the structure generates displacement and touches a certain contact pin, the acquisition instrument records the time point t of the access and the corresponding channel number because the access can generate an electric signal; the acquisition instrument acquires n groups of data, namely the access time points t of different channelsiWherein i is 1, 2, 3 … …; programming by LabVIEW, converting the single-time point data into displacement-time point data according to the corresponding spectrum of the channel number and the displacement value, and transmitting the displacement-time point data to the portable computer through an optical fiber or a USB connecting line;
(4) displaying and storing the structural displacement; drawing a displacement response graph for the displacement-time point data transmitted to the computer through matlab programming; and automatically storing the graph and the data into a hard disk of the computer.
Preferably, the cross section of the contact pin is circular, the diameter of the contact pin is not more than 2.5mm, and the material of the contact pin is good conductive material such as steel or copper.
Preferably, the base is a basin containing dry sand or other base that allows vertical movement of the stylus.
Preferably, in step (2), n contact pins are inserted into the base to form a circular array, each contact pin having a different distance from the structure and representing a different displacement value x of the structureiValue of displacement xiShould cover the interval [ A, B]In accordance with the measurementThe gradient difference between the contact pin and the structural distance is set according to the requirement of test precision, A is taken according to the minimum displacement value which is expected to be measured in the test, and B is taken according to the following formula for a component mid-span measuring point, wherein the unit is m:
B＝160×Mu×l2/(307×0.85×E×Ic)+0.01
Muis the ultimate bending moment of the component, l is the span of the component, E is the modulus of elasticity of the material, IcIs the effective section moment of inertia of the component;
ultimate bending moment M for reinforced concrete membersuCalculated according to the following formula:
Mu＝Ac×fy×(ho-as)+(At-Ac)×fy×(ho-a/2)
a＝[(At-Ac)×fy]/(0.85×fc×b)
Acarea of the compressed reinforcement, AtIs the area of the tensioned reinforcement, hoIs the effective height of the cross section, asDistance of center of tension bar from edge of concrete, fyIs the yield strength of the steel bar, fcThe compressive strength of the concrete, and b the width of the cross section;
ultimate bending moment M for pure steel componentsuCalculated according to the following formula:
Mu＝W×fy
w is the cross-sectional moment of resistance, fyThe yield strength of steel.
The invention has the beneficial effects that: by utilizing the clear physical significance and the circuit on-off principle, the measuring method for the displacement response of the explosion test structure is designed, so that the cost is saved, and the accurate measurement of the displacement data of the explosion test can be ensured.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Figure 2 is a schematic view of the stylus construction of the present invention.
Fig. 3 is a schematic three-dimensional structure diagram of the contact pin array and the base of the present invention.
FIG. 4 is a schematic diagram of a three-dimensional structure for testing according to the present invention.
FIG. 5 is a schematic wiring diagram of the present invention.
Wherein, 1, a contact pin; 2. a wire; 3. a base; 4. fine sand; 5. a metallic paint; 6. an acquisition instrument; 7. a portable computer; 8. an initiator; 9. an explosive; 10. and (4) testing the component.
Detailed Description
As shown in fig. 1, a method for measuring a displacement response of an explosion test structure comprises the following steps:
first step, manufacturing a contact pin:
designing the length of the contact pins according to the measuring point positions of the structure to be measured, and manufacturing n contact pins;
second, installation and wiring of contact pins:
the contact pins are connected with a lead at the tail end, n contact pins are inserted into the base to form a circular array, and each contact pin has different distances from the structure and represents different displacement values x of the structurei(i ═ 1, 2, 3 … … n); connecting n leads connected with the contact pins into each channel of the acquisition instrument, spraying conductive paint on the surface of a structural measuring point, and leading out leads to be connected into the acquisition instrument; connecting the explosion initiator to an acquisition instrument; the portable computer is connected with the acquisition instrument through an optical fiber or a USB connecting wire.
And thirdly, acquiring contact time points of each contact pin and the structure and transmitting data:
the point of pressing the initiator is the zero time point of data acquisition, when the structure generates displacement and touches a certain contact pin, the acquisition instrument records the time point t of the access and the corresponding channel number because the access can generate an electric signal; the acquisition instrument acquires n groups of data, namely the access time points t of different channelsi(i ═ 1, 2, 3 … …); and programming by LabVIEW, converting the single-time point data into displacement-time point data according to the corresponding spectrum of the channel number and the displacement value, and transmitting the displacement-time point data to the portable computer through an optical fiber or a USB connecting line.
Fourthly, displaying and storing the structural displacement:
drawing a displacement response graph for the displacement-time point data transmitted to the computer through matlab programming; and automatically storing the graph and the data into a hard disk of the computer.
In this embodiment, the method of the present invention is described in detail by taking the displacement measurement of a mid-span measuring point of a reinforced concrete beam under the action of an explosive load as an example:
and calculating to obtain a B value according to the details of the reinforcing bars and the section size of the reinforced concrete beam and the following formula:
B＝160×Mu×l2/(307×0.85×E×Ic)+0.01
Muis the ultimate bending moment of the component, l is the span of the component, E is the modulus of elasticity of the material, IcIs the effective cross-sectional moment of inertia of the component.
Ultimate bending moment M for reinforced concrete membersuCalculated according to the following formula:
Mu＝Ac×fy×(ho-as)+(At-Ac)×fy×(ho-a/2)
a＝[(At-Ac)×fy]/(0.85×fc×b)
Acarea of the compressed reinforcement, AtIs the area of the tensioned reinforcement, hoIs the effective height of the cross section, asDistance of center of tension bar from edge of concrete, fyIs the yield strength of the steel bar, fcB is the width of the cross section, which is the compressive strength of the concrete.
Ultimate bending moment M for pure steel componentsuCalculated according to the following formula:
Mu＝W×fy
w is the cross-sectional moment of resistance, fyThe yield strength of steel.
The minimum displacement value required to be measured is determined to be 10mm, namely A is 10mm, the displacement test precision is determined to be 1mm, namely the displacement gradient is decreased by 1mm, and n contact pins with the diameter of 1.5mm are manufactured.
Connecting a wire at the end of each contact pin, and inserting n contact pins into the base to form a circular array, wherein each contact pin has different distances from the structure and represents different displacement values xi (i is 1, 2, 3 … … n) of the structure; connecting n leads connected with the contact pins into each channel of the acquisition instrument, spraying conductive paint on the surface of a structural measuring point, and leading out leads to be connected into the acquisition instrument; connecting the explosion initiator to an acquisition instrument; the portable computer is connected with the acquisition instrument through an optical fiber or a USB connecting wire.
The point of pressing the initiator is the zero time point of data acquisition, when the structure generates displacement and touches a certain contact pin, the acquisition instrument records the time point t of the access and the corresponding channel number because the access can generate an electric signal; the acquisition instrument acquires n groups of data, namely the access time points t of different channelsi(i ═ 1, 2, 3 … …); and programming by LabVIEW, converting the single-time point data into displacement-time point data according to the corresponding spectrum of the channel number and the displacement value, and transmitting the displacement-time point data to the portable computer through an optical fiber or a USB connecting line.
Drawing a displacement response graph for the displacement-time point data transmitted to the computer through matlab programming; and automatically storing the graph and the data into a hard disk of the computer.

Claims (3)

1. A method for measuring the displacement response of an explosion test structure is characterized by comprising the following steps:
(1) manufacturing a contact pin; designing the length of the contact pins according to the measuring point positions of the structure to be measured, and manufacturing n contact pins;
(2) mounting a contact pin; the contact pins are connected with a lead at the tail end, n contact pins are inserted into the base to form a circular array, and each contact pin has different distances from the structure and represents different displacement values x of the structureiWherein i is 1, 2, 3 … … n; connecting n leads connected with the contact pins into each channel of the acquisition instrument, spraying conductive paint on the surface of a structural measuring point, and leading out leads to be connected into the acquisition instrument; connecting the explosion initiator to an acquisition instrument; connecting the portable computer with the acquisition instrument through an optical fiber or a USB connecting wire;
n contact pins are inserted into the base to form a circular array, each contact pin has a different distance from the structure and represents a different displacement value x of the structureiValue of displacement xiShould cover the interval [ A, B]Setting gradient difference between the contact pin and the structure distance according to the requirement of test precision, taking value according to the minimum displacement value expected by test, and regarding the component cross-center measuring point, B according to the following formulaValues, in units of m:
B＝160×Mu×l2/(307×0.85×E×Ic)+0.01
Muis the ultimate bending moment of the component, l is the span of the component, E is the modulus of elasticity of the material, IcIs the effective section moment of inertia of the component;
ultimate bending moment M for reinforced concrete membersuCalculated according to the following formula:
Mu＝Ac×fy×(ho-as)+(At-Ac)×fy×(ho-a/2)
a＝[(At-Ac)×fy]/(0.85×fc×b)
Acarea of the compressed reinforcement, AtIs the area of the tensioned reinforcement, hoIs the effective height of the cross section, asDistance of center of tension bar from edge of concrete, fyIs the yield strength of the steel bar, fcThe compressive strength of the concrete, and b the width of the cross section;
ultimate bending moment M for pure steel componentsuCalculated according to the following formula:
Mu＝W×fy
w is the cross-sectional moment of resistance, fyThe yield strength of the steel material;
(3) when each contact pin is contacted with the structure, point acquisition and data transmission are carried out; the point of pressing the initiator is the zero time point of data acquisition, when the structure generates displacement and touches a certain contact pin, the acquisition instrument records the time point t of the access and the corresponding channel number because the access can generate an electric signal; the acquisition instrument acquires n groups of data, namely the access time points t of different channelsiWherein i is 1, 2, 3 … …; converting the single-time point data into displacement-time point data according to the corresponding spectrum of the channel number and the displacement value, and transmitting the displacement-time point data to the portable computer through an optical fiber or a USB connecting line;
(4) displaying and storing the structural displacement; drawing a displacement response graph for the displacement-time point data transmitted to the computer; and automatically storing the graph and the data into a hard disk of the computer.
2. A method of measuring the displacement response of an explosion-tested structure according to claim 1, wherein the stylus has a circular cross-section with a diameter of no more than 2.5mm and is of a material which is a good conducting material.
3. A method of measuring the displacement response of an explosion-tested structure according to claim 1, wherein the base is a basin containing dry sand or other base which allows vertical movement of the stylus.
CN201911343149.9A 2019-12-24 2019-12-24 Method for measuring displacement response of explosion test structure Active CN111023958B (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852411A (en) * 1981-09-21 1983-03-28 Nippon Steel Corp Measuring method for distribution of charging materials in blast furnace
CN102519352A (en) * 2011-12-15 2012-06-27 西北核技术研究所 Method for measuring deformation of metal cylinders under internal explosion effect and device
CN102967189A (en) * 2012-11-22 2013-03-13 中北大学 Explosive blast overpressure space-time field reconstruction method
CN205027387U (en) * 2015-10-13 2016-02-10 沈阳汇恒科技发展有限公司 Comprehensive testing system in ink jet numbering machine ink cylinder
CN105547377A (en) * 2016-03-10 2016-05-04 西安天力金属复合材料有限公司 Testing method of sheet metal explosive welding dynamic parameters
CN205861715U (en) * 2016-07-31 2017-01-04 安徽理工大学 A kind of instrument measuring explosion velocity of explosive
CN107797151A (en) * 2017-12-20 2018-03-13 福建省麦雅数控科技有限公司 A kind of reverse buckling type metal detection probe
JP2019002806A (en) * 2017-06-15 2019-01-10 三菱日立パワーシステムズ株式会社 Scale thickness measurement device and scale thickness measurement method
CN109299540A (en) * 2018-09-25 2019-02-01 重庆大学 Plane frame structure Static Non-linear Analyisis based on rigid body criterion

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5852411A (en) * 1981-09-21 1983-03-28 Nippon Steel Corp Measuring method for distribution of charging materials in blast furnace
CN102519352A (en) * 2011-12-15 2012-06-27 西北核技术研究所 Method for measuring deformation of metal cylinders under internal explosion effect and device
CN102967189A (en) * 2012-11-22 2013-03-13 中北大学 Explosive blast overpressure space-time field reconstruction method
CN205027387U (en) * 2015-10-13 2016-02-10 沈阳汇恒科技发展有限公司 Comprehensive testing system in ink jet numbering machine ink cylinder
CN105547377A (en) * 2016-03-10 2016-05-04 西安天力金属复合材料有限公司 Testing method of sheet metal explosive welding dynamic parameters
CN205861715U (en) * 2016-07-31 2017-01-04 安徽理工大学 A kind of instrument measuring explosion velocity of explosive
JP2019002806A (en) * 2017-06-15 2019-01-10 三菱日立パワーシステムズ株式会社 Scale thickness measurement device and scale thickness measurement method
CN107797151A (en) * 2017-12-20 2018-03-13 福建省麦雅数控科技有限公司 A kind of reverse buckling type metal detection probe
CN109299540A (en) * 2018-09-25 2019-02-01 重庆大学 Plane frame structure Static Non-linear Analyisis based on rigid body criterion

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