CN109682884B - Beam fiber breaking sound measuring device and method for symmetrical displacement of longitudinal sound pickup - Google Patents
Beam fiber breaking sound measuring device and method for symmetrical displacement of longitudinal sound pickup Download PDFInfo
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- CN109682884B CN109682884B CN201811568855.9A CN201811568855A CN109682884B CN 109682884 B CN109682884 B CN 109682884B CN 201811568855 A CN201811568855 A CN 201811568855A CN 109682884 B CN109682884 B CN 109682884B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to a device and a method for measuring beam fiber breaking sound of symmetrical displacement of a longitudinal sound pickup. The device consists of m sound pickups arranged in a longitudinal linear array, an information acquisition module and an analysis system, wherein the m sound pickups are arranged in the longitudinal linear array and consist of a parabolic hemispherical cover and a micro microphone arranged on the focus of the parabola. The measurement method of the device is that when the fiber bundle is stretched and broken, the broken sound is transmitted to the nearest sound pickup with the highest sound energy and is recorded. The number of broken fibers in the area and the sound intensity of each broken fiber can be obtained according to the breaking pulse measured by the sound pick-up, the number of the highest pulse values measured by all the sound pick-up at the same time is the total number of the broken fibers and the approximate area of fiber breakage, and then the breaking degree of the single fiber is judged according to the peak value. The acoustic measurement device can be used as a functional component on a beam fiber strength tester or be used independently, and can be used for measuring the average breaking strength, the variation coefficient, the average breaking elongation and the variation coefficient of a single fiber.
Description
Technical Field
The invention relates to a device and a method for measuring beam fiber breaking sound of symmetrical displacement of a longitudinal sound pick-up, and belongs to the technical field of textile fiber testing.
Background
In the spinning process technology, the breaking strength of parallel bundle fibers is closely related to the quality of yarns, and the elongation and strength of the parallel bundle fibers are highly related to the measured single fibers. Therefore, the detection of the internal microscopic deformation, damage and fracture process of the bundle fiber becomes an urgent need for scientific research and engineering practice.
Currently, the elongation and breaking properties of fiber materials are generally measured by a high-speed photography method. The whole process of extension and breakage of the fiber after being stressed is shot by a high-speed camera, the form of the instantaneous fiber and the whole process of extension and breakage of the fiber are observed by a projector, and the tensile breaking performance of the fiber material is analyzed and researched. Although this method is intuitive, the fiber monofilaments are shielded from each other, and therefore, when the bundle fiber is imaged, the shielded portion cannot be imaged, and the breakage and position of the internal fiber cannot be observed.
Chinese patent application No. CN 88105476.3 describes a method of using mechanical vibration caused by acoustic emission of measured fiber in the process of being stressed to couple to a piezoelectric body of an acoustic emission sensor to generate resonance vibration, which is then sensed by an electrode and converted into an electric signal, which is transmitted to an acoustic emission instrument for amplification, wave diagnosis and frequency selection, and finally received by a recorder to record the acoustic emission phenomenon of the fiber in the whole side detection process. However, this method can only be measured for single or single layers with spaces between the fibers. For the measurement of bundle fibers, the mechanical vibration caused by the close connection between fibers by using acoustic emission inevitably generates mutual influence and cannot be measured. In a method for focusing array noise signals in target noise measurement, which is disclosed in chinese patent application No. CN200710176151.2, a method of multichannel delay focusing alignment is used to collect sounds, but the method cannot be applied to collection and detection of weak breaks in bundle fibers.
US 2007/0218806 Al describes a method for nondestructive testing of carbon fiber composite materials, in which the sound of fiber breakage is measured by means of an embedded sensor, and the presence or absence of breakage damage of the fiber can only be determined by the presence or absence of a signal from the sensor, and the damage degree cannot be determined. US patent No. US 5104391 discloses an apparatus and method for single fiber break acoustic measurement, but cannot be applied to measurement of ordinary bundle fiber break acoustic.
Disclosure of Invention
The invention aims to provide a measuring method and a measuring device capable of monitoring and analyzing the stretching behavior of bundle fibers, which can acquire the stress damage and fracture conditions of the bundle fibers under static and dynamic conditions.
In order to achieve the above object, the present invention provides a device for measuring a beam fiber breaking sound by a symmetrical displacement of a longitudinal microphone, comprising:
a microphone array formed by m microphones arranged in a column line array, m >3, the microphone array being arranged in and completely covered by the bundle fiber;
the collecting module is used for collecting fiber fracture sound wave signals faithfully through the sound pick-up array after the bundle fibers are stretched;
in the process of stretching the bundle fibers, a translation mechanism for driving the sound pick-up array to move is driven to ensure that the sound pick-up array is positioned at the center of mass of the stretched bundle fibers;
and the analysis system is used for carrying out data analysis and calculation on the fiber fracture sound wave signals acquired by the acquisition module.
Preferably, the pickup is composed of a half parabolic hemispherical cover and a microphone disposed at a focus of the half parabolic hemispherical cover.
Preferably, the microphone has the dimensions of 3-4 mm in length, 2-3 mm in width and 1-1.5 mm in height, and the sensitivity error of the microphone is +/-1 dB.
Preferably, the arrangement directions of the end surface parabola length and the short axis of the semi-parabolic hemispherical cover are different, and the end surface parabola length axis of the semi-parabolic hemispherical cover is perpendicular to the arrangement direction of the bundle of fibers.
Preferably, the moving speed of the translation mechanism driving the sound pick-up array to translate is 1/2 times of the drawing speed of the bundle of fibers.
The invention also provides application of the device for measuring the beam fiber breaking sound with the symmetrical displacement of the longitudinal pickup, which is characterized in that the device is used as a functional component on a beam fiber strength tester or the device is used independently for measuring the average breaking strength, the coefficient of variation and the average breaking elongation and the coefficient of variation of single fibers.
The invention also provides a method for measuring the beam fiber breaking sound of the symmetrical displacement of the longitudinal sound pick-up, which is characterized by comprising the following steps:
the tow fiber that awaits measuring is stretched, and at tensile in-process, is taken the adapter array by translation mechanism and removes to guarantee that the adapter array is in the tensile barycenter position of tow fiber, simultaneously, pass through the fiber fracture sound wave signal by collection module, after the tow fiber is tensile, analytic system obtains the wave form of the fiber fracture sound wave signal that every adapter gathered, obtains the inside atress of tow fiber in the tensile in-process, damage, the fracture condition through the analysis to the wave form characteristic.
Preferably, when a fiber break occurs, the waveform of the fiber break acoustic signal exhibits distinct peaks and valleys.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: (a) The linear array sound pick-up can effectively pick up the oscillating sound waves generated by the fracture of the multilayer superposed fiber bundles; (b) The micro sound pick-up can collect and amplify the broken sound waves and effectively detect weak signals of fiber breakage; (c) The linear array sound pick-up can overcome the inconsistent propagation of sound waves in the longitudinal direction and the transverse direction of the fiber, and improve the accuracy of the sound measuring device.
Drawings
FIG. 1 is a diagram of a device for measuring the acoustic wave of fiber breakage in a longitudinal linear array arrangement;
FIG. 2 is a schematic view of a half-parabolic micro-microphone pickup;
FIG. 3 is a waveform diagram of a fracture sound collection and analysis, in which the abscissa represents time and the ordinate represents the amplitude level of a signal;
in the figure: 1-a sound pick-up; 2-a miniature microphone; 3-half parabolic hemispherical cover; 4, an acquisition module; 5-analyzing the system machine; 6-a translation mechanism.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. The raw materials and equipment in the implementation are the funded project of the national emphasis research and development plan (2016 YFC 0802802). It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1: fibrilia bundle
The bundle fiber is clamped at two ends of the holder, and a plurality of sound pick-up devices 1 are arranged in a longitudinal linear array to form a sound pick-up device array which is arranged in the bundle fiber and is completely covered by the bundle fiber. The sound pick-up 1 is connected with an acquisition module 4 and an analysis system 5 on a computer. When the bundle fiber is stretched, the fiber is damaged, the acquisition module 4 acquires the fiber fracture sound wave signals through the sound pick-up array, and the analysis system 5 forms signal waveforms through the received fiber fracture sound wave signals and displays the signal waveforms on a computer. When the fiber breaks, the signal waveform has obvious peaks and valleys. By analyzing and calculating the characteristics of the signal waveform of the fiber fracture sound wave signal collected by each sound pickup, the internal stress, damage and fracture conditions of the bundle fiber in the stretching process can be obtained. In this embodiment, cool Edit pro2.0 software is used to collect and analyze the signal waveform.
Example 2: carbon fiber bundle
The bundle fiber is clamped at two ends of the holder, a plurality of sound pick-up devices 1 are arranged in a longitudinal linear array to form a sound pick-up device array, and the sound pick-up device array is arranged in the bundle fiber and is completely covered by the bundle fiber. The sound pick-up 1 is connected with an acquisition module 4 and an analysis system 5 on a computer. When the bundle fiber is stretched, the fiber is damaged, the acquisition module 4 acquires the fiber fracture sound wave signals through the sound pick-up array, and the analysis system 5 forms signal waveforms through the received fiber fracture sound wave signals and displays the signal waveforms on a computer. When the fiber breaks, the signal waveform has obvious peaks and valleys. By analyzing and calculating the characteristics of the signal waveform of the fiber fracture sound wave signal collected by each sound pickup, the internal stress, damage and fracture conditions of the bundle fiber in the stretching process can be obtained. In this embodiment, cool Edit pro2.0 software is used to collect and analyze signal waveforms.
Example 3: wool fiber
The bundle fiber is clamped at two ends of the holder, a plurality of sound pick-up devices 1 are arranged in a longitudinal linear array to form a sound pick-up device array, and the sound pick-up device array is arranged in the bundle fiber and is completely covered by the bundle fiber. The sound pick-up 1 is connected with an acquisition module 4 and an analysis system 5 on a computer. When the bundle fiber is stretched, the fiber is damaged, the acquisition module 4 acquires the fiber fracture sound wave signals through the sound pick-up array, and the analysis system 5 forms signal waveforms through the received fiber fracture sound wave signals and displays the signal waveforms on a computer. When the fiber breaks, the signal waveform has obvious peaks and valleys. By analyzing and calculating the characteristics of the signal waveform of the fiber fracture sound wave signal collected by each sound pickup, the internal stress, damage and fracture conditions of the bundle fiber in the stretching process can be obtained. In this embodiment, cool Edit pro2.0 software is used to collect and analyze signal waveforms.
Claims (6)
1. A device for measuring beam fiber breaking sound of symmetrical displacement of a tandem pickup is characterized by comprising: a microphone array formed by m microphones (1) arranged in a longitudinal linear array, m >3, the microphone array being arranged in and completely covered by the bundle fibers; the pickup (1) consists of a semi-parabolic hemispherical cover (3) and a microphone (2) arranged on the focus of the semi-parabolic hemispherical cover;
the collecting module (4) is used for collecting fiber fracture sound wave signals faithfully through the sound pick-up array after the bundle fibers are stretched;
in the process of stretching the bundle fiber, a translation mechanism (6) for moving the sound pick-up array is carried to ensure that the sound pick-up array is positioned at the center of mass of the stretched bundle fiber;
the analysis system (5) is used for carrying out data analysis and calculation on the fiber fracture sound wave signals acquired by the acquisition module (4), the analysis system (5) is used for obtaining the waveform of the fiber fracture sound wave signals acquired by each sound pickup (1), and the internal stress, damage and fracture conditions of the bundle fibers in the stretching process are obtained through analysis of waveform characteristics;
the translation mechanism (6) drives the sound pick-up array to translate at a speed which is 1/2 times of the drawing speed of the bundle of fibers.
2. The device for measuring the beam fiber breaking sound of the longitudinal pickup symmetric displacement according to claim 1, is characterized in that the dimension of the miniature microphone (2) is 3 to 4mm in length, 2 to 3mm in width and 1 to 1.5mm in height, and the sensitivity error of the miniature microphone is +/-1 dB.
3. The apparatus for measuring the beam fiber breaking sound of the longitudinal pickup symmetric displacement according to claim 1, wherein the end surface parabolic length and the short axis arrangement direction of the semi-parabolic hemispherical cover (3) are different, and the end surface parabolic length axis of the semi-parabolic hemispherical cover (3) is perpendicular to the beam fiber arrangement direction.
4. Use of the apparatus for beam fiber break acoustic measurement of the symmetrical displacement of a column pick-up according to claim 1, wherein the apparatus according to claim 1 is used as a functional component on a beam fiber strength tester or the apparatus according to claim 1 is used alone for measurement of the average breaking strength, coefficient of variation and average breaking elongation of a single fiber.
5. A method for beam fiber break acoustic measurement of the symmetrical displacement of a tandem microphone, characterized in that the device of claim 1 is used, comprising the steps of:
the tow fiber that awaits measuring is stretched, in tensile process, take the adapter array to remove by translation mechanism (6) to guarantee that the adapter array is in the tensile barycenter position of tow fiber, simultaneously, pass through the fiber fracture sound wave signal by collection module (4), after the tow fiber is tensile, analysis system (5) obtain the wave form of the fiber fracture sound wave signal that every adapter (1) gathered, through the inside atress, damage, the fracture condition of the tow fiber in the analysis to the wave form characteristic.
6. The method for measuring the beam fiber break sound of the symmetrical displacement of the tandem microphone as claimed in claim 5, wherein the waveform of the fiber break sound wave signal shows distinct peaks and valleys when the fiber break occurs.
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| CN102507744A (en) * | 2011-10-16 | 2012-06-20 | 浙江大学 | Acoustic emission device and method for detecting destructive failure of carbon fiber composite material |
| CN102507739A (en) * | 2011-11-15 | 2012-06-20 | 北京理工大学 | Ultrasonic guided wave defect imaging method for impact damages of carbon fiber composite material |
| JP6346214B2 (en) * | 2016-03-24 | 2018-06-20 | 株式会社Ｓｕｂａｒｕ | Composite material forming jig, composite material forming method, ultrasonic inspection system, ultrasonic inspection method, and aircraft structure |
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