KR20160001824A - High temperature modal test apparatus - Google Patents

High temperature modal test apparatus Download PDF

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Publication number
KR20160001824A
KR20160001824A KR1020140079268A KR20140079268A KR20160001824A KR 20160001824 A KR20160001824 A KR 20160001824A KR 1020140079268 A KR1020140079268 A KR 1020140079268A KR 20140079268 A KR20140079268 A KR 20140079268A KR 20160001824 A KR20160001824 A KR 20160001824A
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South Korea
Prior art keywords
specimen
rti
support member
supporting
temperature
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KR1020140079268A
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Korean (ko)
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고용서
심재호
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수원대학교산학협력단
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Priority to KR1020140079268A priority Critical patent/KR20160001824A/en
Publication of KR20160001824A publication Critical patent/KR20160001824A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/08—Shock-testing
    • 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
    • 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
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075—Strain-stress relations or elastic constants
    • 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
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means

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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)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention relates to a high temperature modal test device. The high temperature modal test device comprises: a specimen support unit supporting a specimen formed of a material to be measured; a specimen heating unit heating the specimen supported by the specimen support unit; a punching unit punching the specimen supported by the specimen support unit to generate vibration on the specimen; a microphone changing a sound generated due to the vibration of the specimen punched by the punching unit to an electrical signal; and a control unit receiving the electrical signal transmitted by the microphone, and storing the electrical signal as data to calculate the number of vibrations of the specimen. According to the present invention, the high temperature modal test device enables a modal test to be performed at high temperatures, and minimizes time and effort required for the test; thereby improving efficiency of the test. Moreover, the high temperature modal test device obtains an accurate dynamic elastic coefficient on the specimen formed of the material to be measured, and accurately estimates a movement in the high temperature of the material to be measured.

Description

{High temperature modal test apparatus}

The present invention relates to a high-temperature modal testing apparatus, and more particularly, to a high-temperature modal testing apparatus that can be applied to modal testing in a high-temperature environment.

In general, components such as automobiles, airplanes, and power plants as well as engine components operate in a high temperature environment. In addition, ultra-high cycle fatigue test of about 100 million cycles is required as composite materials are used due to lighter parts.

The ultra-high cycle fatigue test operates at a high frequency of about 20kHz using resonance. To generate resonance for the specimen of the object to be measured, the dynamic modulus of the specimen should be known. In a high temperature environment of 70% or more of the melting point temperature, the elastic modulus and tensile strength of the component are remarkably reduced. Accurate measurement of dynamic elastic modulus values for each temperature is necessary to accurately measure the performance degradation of such high temperature composite parts.

That is, when the dynamic elastic modulus value of the material to be measured is obtained through a modal test, the high-temperature behavior of the material to be measured can be accurately predicted.

As a device used for the conventional modal test, a "modal test test jig" of Korean Utility Model Application No. 20-1999-0029351 has been proposed. The device is provided with a roller inside the side wall in a rectangular shape, A plurality of compression springs disposed on the bottom plate; A movable frame having a bottom plate mounted on the compression spring, a side wall mounted on the roller so as to be guided by the roller, and having a plurality of bolt holes on the side wall; And a support rod screwed to the bolt hole formed in the side wall of the movable frame and adjusted in length so that the test object can be stably mounted on the upper end portion.

However, this conventional technique has a problem that it is not applicable to the modal test in a high temperature environment, and it is difficult to accurately perform the modal test on the material to be measured.

In order to solve the problems of the prior art as described above, the present invention can be applied to a modal test in a high-temperature environment, such a test can be easily performed, and accurate dynamic elasticity So that the high temperature behavior of the material to be measured can be accurately predicted.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to an aspect of the present invention, there is provided a specimen holder for supporting a specimen made of a material to be measured. A specimen heating unit for supplying heat to the specimen supported by the specimen support; A striking portion for striking the specimen supported by the specimen supporting portion to generate vibration in the specimen; A microphone for converting a sound generated by vibration of the specimen struck by the hitting unit into an electrical signal; And a controller receiving the electrical signal transmitted from the microphone and calculating the frequency of the specimen or storing the data as data for calculating the frequency of the specimen.

The specimen supporting portion includes a stand mounted on the ground; And wires extending from the stand to a plurality of downward directions and connected to the specimens, respectively.

The specimen supporting portion includes: a supporting plate provided on the ground; And a support member which is provided to extend from the support plate in a plurality of directions upward and which supports the specimen and is made of a deformable material.

Wherein the specimen heating section includes: an induction coil wound around the specimen with a gap therebetween; And an induction heater for applying heat to the induction coil to cause heat to be released from the induction coil by electromagnetic induction.

The striking portion may include: a rotation supporting member provided on the specimen supporting portion; And a hammer rotatably installed on the rotation support member and hitting the end of the specimen in the longitudinal direction by rotation.

Wherein the striking portion comprises: a clamp fixed to the specimen supporting portion so as to be vertically adjustable; A fixing block fixed to the clamp; A rack is vertically provided, the rotation support member is slidably coupled to the rack up and down, and the lower end of the rotation support member is provided with a latching portion for supporting the rotation support member A guide member; And a pinion fixed to an outer circumferential surface of a rotary shaft installed to fix the hammer to the rotary support member and gear-coupled to the rack, wherein when the rotary support member is lowered due to its weight together with the hammer, The pinion may be lowered and rotated along the rack so that the hammer may perform a swing motion for striking.

The control unit may receive the sensing signal output from the temperature sensor for measuring the temperature of the specimen, and may control the specimen heating unit such that the specimen corresponds to a predetermined temperature or temperature range.

According to the high-temperature modal testing apparatus according to the present invention, it is possible to perform the modal testing in a high-temperature environment, to minimize the time and effort required for the test, to increase the efficiency of the test, The elastic modulus can be obtained so that the high-temperature behavior of the material to be measured can be accurately predicted.

1 is a perspective view showing a high-temperature modality testing apparatus according to a first embodiment of the present invention.
2 is a front perspective view showing a striking portion of the high-temperature modal testing apparatus according to the first embodiment of the present invention.
3 is a rear perspective view showing a striking portion of the high-temperature modal testing apparatus according to the first embodiment of the present invention.
4 is a perspective view showing a high-temperature modal testing apparatus according to a second embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in detail in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

1 is a perspective view showing a high-temperature modality testing apparatus according to a first embodiment of the present invention.

1, a high-temperature modality testing apparatus 100 according to a first embodiment of the present invention includes a specimen supporting unit 110, a specimen heating unit 120, a striking unit 130, a microphone 140, and a controller 150 ).

The specimen supporting part 110 supports the specimen 1 made of the material to be measured. Here, the specimen 1 is applied to any part of a component for calculating an elastic modulus and a tensile strength which are reduced by operating in a high-temperature environment, such as an engine part of an automobile operating in a high temperature environment, . In addition, the specimen 1 may have a bar shape having a predetermined length as in the present embodiment, but the present invention is not limited thereto.

The test piece supporting portion 110 may include a stand 111 installed on the ground and a wire 112 connected to the test piece 1 so as to extend downward from the stand 111 a plurality of times. Here, for example, the stand 111 may be provided with a post 111b in the form of a letter "A" on a support plate 111a provided on the ground. The wire 112 may be made of various materials including metal, synthetic resin, etc., and may be connected to the outer circumferential surface of the test piece 1 or the test piece 1, for example.

The specimen heating section 120 provides heat to the specimen 1 supported on the specimen support section 110 to provide the same or similar environment as the high temperature environment. Various heating devices including an electric heating line, a halogen lamp, However, an electromagnetic induction heating apparatus can be used as in this embodiment.

The specimen heating section 120 includes an induction coil 121 wound around the specimen 1 with a gap around the induction coil 121 and an electromagnetic induction coil (Not shown). Here, the induction coil 121 can be wound around the specimen 1 and supported by a support, etc., while maintaining the gap between the specimen 1 and the specimen 1 so that the specimen 1 can flow by impact.

The striking portion 130 strikes the specimen 1 supported by the specimen supporting portion 110 to cause the specimen 1 to generate vibration. The striking portion 130 includes a rotation support member 131 installed on the post 111b of the specimen support portion 110 and a rotation support member 131 rotatably installed on the rotation support member 131, And a hammer 132 for striking in the longitudinal direction. The rotation support member 131 may be installed directly on the post 111b, for example, or may be installed on the post 111b via separate members as in the present embodiment as another example.

The hammer 132 may have a size and a weight so as to apply or analyze high frequency vibrations. On the other hand, the hammer 132 performs a swing motion for hitting the end of the specimen 1 by manual operation of the operator or rotation of the rotation support member 131 by the driving force of an actuator such as a motor or a cylinder. It is possible to perform a swing operation for hitting the end of the specimen 1 by manual operation of a simple operator.

2 and 3, the striking part 130 includes a clamp 133 fixed to the specimen supporting part 110 so as to be adjustable in height up and down as in the present embodiment, a fixing block 140 fixed to the clamp 133, A rack 135c is vertically provided and the rotation support member 131 is vertically moved toward the rack 135c so as to be able to adjust a tilting angle from the fixed block 134, A guide member 135 which is slidably coupled and has a hook 135d for supporting the rotation support member 131 so as not to be detached at the lower end thereof and a guide member 135b for fixing the hammer 132 to the rotation support member 131 And a pinion 136 fixed to the outer circumferential surface of the rotating shaft 131b to be installed and gear-coupled to the rack 135c.

The clamp 133 is provided with a divided portion 133a capable of being split at both ends thereof at one end in order to fit into the post 111b and the fastening member 133b is fastened to the divided portion 133a, And can be detachably fixed.

The fixing block 134 can be fixed to the clamp 133 by the first and second fixing bolts 134a and 134b fastened to the nut and the first fixing bolt 134a is fixed to the guide member 135 by the nut, The guide member 135 can be installed to be rotatable around the first fixing bolt 134a.

The guide member 135 may be provided with a curvature fixing portion 135a having a curved slit 135b to be fastened with a nut to the second fixing bolt 134b so that the tilting angle can be adjusted from the fixing block 134 . The curvature fixing portion 135a is formed so that the second fixing bolt 134b is positioned at a constant turning radius even if the guide member 135 rotates about the first fixing bolt 134a by forming the curved slit 135b So that it can be fixed to the fixed block 134.

The striking portion 130 is configured such that the operator rotatably supports the rotary support member 131 by lifting the rotary support member 131 manually or by a driving force of an actuator such as a motor or a cylinder to a predetermined height, The pinion 136 descends along the rack 135c while the rotation support member 131 is lowered together with the hammer 132 due to its weight so that the hammer 132 performs a swing motion for hitting . The tip of the specimen 1 is positioned at the hitting position of the hammer 132 or the position of the clamp 133 and the fixing block 134 and the tilting angle of the guide member 135 are adjusted, Can be adjusted to strike the end of the test piece 1.

1, the microphone 140 converts sound generated by the vibration of the specimen 1 struck by the striking part 130 into an electrical signal. The sound generated by the vibration of the specimen 1 It can be mounted using a support stand or the like at a position for sensing.

The control unit 150 receives the electrical signal transmitted from the microphone 140 and analyzes the sound wave according to a predetermined process to calculate the frequency of the test piece 1 or to store the frequency as the data for calculating the frequency of the test piece 1 have. The control unit 150 receives the sensing signal output from the temperature sensor 160 for measuring the temperature of the test piece 1 and controls the test piece heating unit 120 so that the test piece 1 corresponds to a predetermined temperature or temperature range . Here, the temperature sensor 160 can be installed by a bracket or a support at a position where the temperature of the specimen 1 can be accurately measured, and a sensor for temperature sensing in various manners including, for example, an infrared temperature sensor can be used.

4 is a perspective view showing a high-temperature modal testing apparatus according to a second embodiment of the present invention.

Referring to FIG. 4, the high-temperature modality testing apparatus 200 according to the second embodiment of the present invention includes a specimen supporting unit 210, a specimen heating apparatus 200, And may further include a temperature sensor 260 which may include other components other than the specimen support 210. For example, the temperature sensor 260 may include a heater 220, a striker 230, a microphone 240, and a controller 250, Temperature modal testing apparatus 200 according to the first embodiment of the present invention, the description thereof will be omitted.

In this embodiment, the specimen supporting part 210 may include a support plate 210 installed on the ground and a support 220 supporting the specimen 1, the support plate 220 being provided so as to extend upward from the support plate 210 .

The support member 220 may be made of a synthetic resin material or metal that can be deformed so that the specimen 1 can be vibrated by the impact portion 230 when the specimen 1 is hit by the impact portion 230. The specimen 1 may be formed by a method such as bolting, .

Hereinafter, the operation of the high-temperature modal testing apparatus according to the present invention will be described, but the high-temperature modal testing apparatus 100 according to the first embodiment of the present invention will be described.

First, the control unit 150 drives the test piece heating unit 120 to heat the test piece 1 to a temperature suitable for the high temperature modal test. The heating of the test piece 1 is performed by the control unit 150 receiving the temperature sensing signal of the temperature sensor 160 by controlling the test piece heating unit 120. This causes the test piece 1 to have a predetermined temperature .

Then, when the hammer 132 hits the end of the specimen 1 in the longitudinal direction by the operation of the hitting portion 130, a vibration sound is received by the microphone 140 due to the vibration of the specimen 1, 140 converts the received vibration sound into an electrical signal and outputs the electrical signal to the controller 150. The control unit 150 acquires or stores data on the vibration of the test piece 1 from the electrical signal of the microphone 140.

The control unit 150 can calculate the dynamic elastic modulus of the test piece 1 by the frequency, for example, the resonance frequency calculated from the data of the vibration of the test piece 1. In this case, the following equation 1 can be used .

[Equation 1]

Figure pat00001

Where E D is the dynamic modulus of elasticity (Mpa = N / mm 2 ), C 1 is 400 × 10 -5 (length / cross section), W is the mass of the specimen (kg), f 1 is the resonance Frequency (Hz).

As described above, according to the present invention, it is possible to perform the modal test in a high-temperature environment, to minimize the time and effort required for the test, to increase the efficiency of the test, and to obtain a correct dynamic elasticity coefficient So that the high-temperature behavior of the material to be measured can be accurately predicted.

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1: Specimen 110, 210: Specimen support
111: stand 111a: support plate
111b: post 112: wire
120, 220: specimen heating section 121: induction coil
122: Induction heating 130, 230:
131: rotation support member 131a:
131b: rotating shaft 132: hammer
133: Clamp 133a:
133b: fastening member 134: fixed block
134a: first fixing bolt 134b: second fixing bolt
135: guide member 135a: curvature fixing unit
135b: Slit 135c: Rack
135d: Retaining portion 136: Pinion
140, 240: microphone 150, 250:
160, 260: Temperature sensor 211:
212: Support

Claims (7)

A specimen support for supporting a specimen made of a material to be measured;
A specimen heating unit for supplying heat to the specimen supported by the specimen support;
A striking portion for striking the specimen supported by the specimen supporting portion to generate vibration in the specimen;
A microphone for converting a sound generated by vibration of the specimen struck by the hitting unit into an electrical signal; And
A control unit receiving the electrical signal transmitted from the microphone and calculating the frequency of the test piece or storing the data as data for calculating the frequency of the test piece;
Lt; RTI ID = 0.0 > modally < / RTI > The method according to claim 1,
The sample supporting portion
Stand mounted on the ground; And
Wires extending from the stand downwardly in a plurality of directions and connected to the specimens, respectively;
Lt; RTI ID = 0.0 > modally < / RTI > The method according to claim 1,
The sample supporting portion
A floor plate installed on the ground; And
A supporting table provided to extend from the receiving plate upward in a plurality of directions and supporting the specimen and made of a deformable material;
Lt; RTI ID = 0.0 > modally < / RTI > The method according to claim 1,
The specimen heating section,
An induction coil wound around the specimen with a gap therebetween;
Induction heating for applying heat to the induction coil to cause heat to be released from the induction coil by electromagnetic induction;
Lt; RTI ID = 0.0 > modally < / RTI > The method according to claim 1,
The hitting portion
A rotating support member installed on the specimen supporting portion; And
A hammer rotatably installed on the rotation support member and hitting the end of the specimen in the longitudinal direction by rotation;
Lt; RTI ID = 0.0 > modally < / RTI > The method of claim 5,
The hitting portion
A clamp fixed to the specimen supporting part so as to be adjustable up and down;
A fixing block fixed to the clamp;
A rack is vertically provided, the rotation support member is slidably coupled to the rack up and down, and the lower end of the rotation support member is provided with a latching portion for supporting the rotation support member A guide member; And
And a pinion fixed to an outer circumferential surface of a rotary shaft installed to fix the hammer to the rotary support member and gear-coupled to the rack,
Wherein when the rotation support member is lowered due to its weight together with the hammer, the pinion is rotated downward along the rack to cause the hammer to perform a swing operation for striking. The method according to claim 1,
Wherein,
And receives the sensing signal output from the temperature sensor for measuring the temperature of the specimen, and controls the specimen heating unit so that the specimen corresponds to a predetermined temperature or temperature range.
KR1020140079268A 2014-06-26 2014-06-26 High temperature modal test apparatus KR20160001824A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107389285A (en) * 2017-06-16 2017-11-24 东南大学 A kind of quick test and evaluation method of bridge changed based on temperature
CN107515092A (en) * 2017-09-20 2017-12-26 苏州聚力电机有限公司 The anti-micro- drop test device of running helter-skelter of one kind
KR101935930B1 (en) * 2018-09-21 2019-04-03 선문대학교 산학협력단 Apparatus and method for measuring dynamic modulus and poisson's ratio of an object using impulse technique
KR101955439B1 (en) * 2018-08-30 2019-05-30 선문대학교 산학협력단 Specimen characteristics measuring device for measuring characteristics by striking specimen while controlling temperature of specimen
KR101955441B1 (en) * 2018-08-10 2019-05-30 선문대학교 산학협력단 Specimen characteristics measuring device for measuring characteristics by striking specimen
KR20190072135A (en) * 2017-12-15 2019-06-25 주식회사 포스코 Coherence testing apparatus and method
CN113351461A (en) * 2021-06-18 2021-09-07 郑州日产汽车有限公司 Excitation equipment suitable for modal and vibration transfer function test
US20220244156A1 (en) * 2019-06-20 2022-08-04 Grindosonic Bv Method and system for analysing a test piece
CN116840079A (en) * 2023-07-04 2023-10-03 哈尔滨工业大学 Test system and method for impact-high temperature coupling loading of metal component

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107389285A (en) * 2017-06-16 2017-11-24 东南大学 A kind of quick test and evaluation method of bridge changed based on temperature
CN107515092A (en) * 2017-09-20 2017-12-26 苏州聚力电机有限公司 The anti-micro- drop test device of running helter-skelter of one kind
KR20190072135A (en) * 2017-12-15 2019-06-25 주식회사 포스코 Coherence testing apparatus and method
KR101955441B1 (en) * 2018-08-10 2019-05-30 선문대학교 산학협력단 Specimen characteristics measuring device for measuring characteristics by striking specimen
KR101955439B1 (en) * 2018-08-30 2019-05-30 선문대학교 산학협력단 Specimen characteristics measuring device for measuring characteristics by striking specimen while controlling temperature of specimen
KR101935930B1 (en) * 2018-09-21 2019-04-03 선문대학교 산학협력단 Apparatus and method for measuring dynamic modulus and poisson's ratio of an object using impulse technique
US20220244156A1 (en) * 2019-06-20 2022-08-04 Grindosonic Bv Method and system for analysing a test piece
US12061177B2 (en) * 2019-06-20 2024-08-13 Grindosonic Bv Method and system for analysing a test piece
CN113351461A (en) * 2021-06-18 2021-09-07 郑州日产汽车有限公司 Excitation equipment suitable for modal and vibration transfer function test
CN116840079A (en) * 2023-07-04 2023-10-03 哈尔滨工业大学 Test system and method for impact-high temperature coupling loading of metal component
CN116840079B (en) * 2023-07-04 2023-12-29 哈尔滨工业大学 Test system and method for impact-high temperature coupling loading of metal component

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