JP2006053119A - Method and apparatus for diagnosing degradation of laminated structure having embedded magnetic object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for diagnosing the degradation of a laminated structure having an embedded magnetic object, capable of diagnosing the presence or absence of delamination and a progress state of the delamination occurring in the laminated structure having the embedded magnetic object. <P>SOLUTION: An alternate magnetic field 9 is applied to the laminated structure 1 having the embedded magnetic object from the outside, thereby exciting a tensile body 10 in the laminated structure 1 having the embedded magnetic object, and then a characteristic frequency F of sound which is generated by the above excitation at a delamination section in the laminated structure 1 having the embedded magnetic object, is detected, and length values T of continuing time when the characteristic frequency F exists, are measured, and length values L1, L2 and L3 of delamination obtained by reductions on the basis of the length values T1, T2 and T3 of continuing time are compared with judging thresholds L0-L5 being set beforehand. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a deterioration diagnosis method for a laminated structure in which a magnetic material is embedded, and a deterioration diagnosis apparatus used in the method.

  As shown in FIGS. 8 to 9, a conventional laminated structure 100 in which a magnetic material is embedded includes a surface canvas layer 101 made of a rubber material, an intermediate rubber layer 102 made of a rubber material, and a central rubber layer 103 made of a rubber material. And a linear tensile body 104 made of a magnetic material such as a plurality of steel cords is embedded between the intermediate rubber layer 102 and the central rubber layer 103. The laminated structure 100 is disposed evenly along the longitudinal direction, and the surface canvas layer 101 and the intermediate rubber layer 102 are bonded with an adhesive such as rubber so as not to generate a gap. The intermediate rubber layer 102 and the central rubber layer 103 are bonded to each other by an adhesive filling member such as rubber so that no gap is generated even if there are a plurality of tensile bodies 104. Body 104 is intermediate So that never Yoreru move between beam layer 102 and the central rubber layer 103.

  However, when the laminated structure 100 in which the conventional magnetic material is embedded is used for a long time and the deterioration of the filling member between the intermediate rubber layer 102 and the central rubber layer 103 progresses, the intermediate rubber layer 102 and the anti-magnetic structure There was a phenomenon in which one or both of the tension members 104 and between the central rubber layer 103 and the tension member 104 were peeled off. This phenomenon is hereinafter referred to as delamination.

  When deterioration of the filling member between the intermediate rubber layer 102 and the central rubber layer 103 progresses and the length of delamination (hereinafter referred to as delamination length) L increases, (a) and (b) of FIG. ), A large gap 105 is formed between the intermediate rubber layer 102 and the center rubber layer 103, and the tensile body 104 moves in the gap 105 so that the tensile body 104 approaches, so that the central rubber layer 103 bulges outward to form a bulging portion 103A, or a plurality of tensile members 104 come into contact with each other, and abnormal wear on the outer peripheral surface (back surface) of the central rubber layer 103 and The tensile body 104 was broken.

  Here, the offset means that a plurality of tensile bodies 104 move between the intermediate rubber layer 102 and the central rubber layer 103 and are partially offset.

  Therefore, conventionally, when diagnosing the wear state of the central rubber layer 103, the laminated structure 100 in which the magnetic material is embedded is removed from the guide, and the outer peripheral surface (back surface) of the central rubber layer 103 is visually confirmed. I was trying to do it. Further, when diagnosing the presence or absence of breakage of the tensile body 104, it is known that the presence or absence of breakage of the tensile body 104 is detected by detecting the leakage magnetic flux from the broken portion of the tensile body 104. (For example, refer to Patent Document 1).

Further, when diagnosing a situation in which a plurality of tensile bodies 104 move and move between the intermediate rubber layer 102 and the central rubber layer 103, a change in magnetic flux accompanying the movement of the tensile body 104 is detected. Thus, the state of the offset is determined (see, for example, Patent Document 2), and the state of the tensile body 104 in the laminated structure 100 in which the magnetic body is embedded is determined by an X-ray fluoroscopic image. What was made was known (for example, refer patent document 3).
JP-A-6-316394 (paragraph number 0005 to paragraph number 0007, FIG. 1) Japanese Patent Laid-Open No. 2002-80185 (paragraph number 0042 to paragraph number 0055, FIGS. 6 to 8) JP-A-10-10060 (paragraph numbers 0012 and 0016, FIGS. 10 to 11)

  In the damage detection apparatus described in JP-A-6-316394 described above, it is possible to diagnose the presence or absence of breakage of the tensile body in the laminated structure in which the magnetic body is embedded, but before the tensile body breaks. It was not possible to diagnose the presence or absence of delamination and the progress of delamination. Moreover, in the abnormality diagnosis apparatus described in Japanese Patent Laid-Open No. 2002-80185 and the X-ray flaw detection apparatus described in Japanese Patent Laid-Open No. 10-10060, the state of the tensile member in the laminated structure in which the magnetic material is embedded is detected. Although it was possible to diagnose, it was not possible to diagnose the presence or absence of delamination and the progress of delamination that occurred before the approaching state.

  The present invention has been made from the above-described prior art, and its purpose is to determine the presence or absence of delamination and the progress of delamination that occur between the laminate in the laminated structure in which the magnetic material is embedded. It is an object of the present invention to provide a deterioration diagnosis method for a laminated structure in which a magnetic material that can be diagnosed is embedded and a deterioration diagnosis device used in the method.

  In order to achieve the above object, the deterioration diagnosis method for a laminated structure in which a magnetic material is embedded according to the present invention applies a magnetic field from the outside of the laminated structure in which the magnetic material is embedded, thereby providing magnetic properties as a tensile body. After exciting the magnetic body in the laminated structure in which the body is embedded, the excitation detects the characteristic frequency of the sound generated at the delamination portion in the laminated structure in which the magnetic body is embedded. In the generation, delamination is detected, and deterioration in the laminated structure in which the magnetic material is embedded is determined.

  In addition, the degradation diagnosis method for a laminated structure in which a magnetic material is embedded according to the present invention applies a magnetic field from the outside of the laminated structure in which the magnetic material is embedded, so that the resistance in the laminated structure in which the magnetic material is embedded is reduced. After the tension body is excited, the characteristic frequency of the sound generated at the delamination portion in the laminated structure in which the magnetic material is embedded is detected, and the length of the generation time of the characteristic frequency is measured. At the same time, by comparing the delamination length obtained by conversion based on the length of the generation duration and a predetermined determination threshold, the deterioration progress in the laminated structure in which the magnetic body is embedded is determined. It is characterized by that.

  Further, in the deterioration diagnosis method for a laminated structure in which the magnetic body of the present invention is embedded, the delamination length obtained by conversion based on the length of the generation duration is determined as a length that does not satisfy the determination threshold. When the distance between the two delaminations is smaller than the preset limit distance or equal to the limit distance LS, the two delaminations are determined as the same delamination. .

  Further, in the degradation diagnosis method for a laminated structure in which a magnetic material is embedded according to the present invention, when a magnetic field is applied from the outside of the laminated structure in which the magnetic material is embedded, the upper surface of the laminated structure in which the magnetic material is embedded. A magnetic field is applied to the tensile body in the laminated structure in which the magnetic body is embedded as a tensile body with a gap from the magnetic field, thereby exciting the tensile body.

  In addition, the degradation diagnosis apparatus for a laminated structure in which a magnetic body is embedded according to the present invention is a magnetic body in the laminated structure in which the magnetic body is embedded by applying a magnetic field from the outside of the laminated structure in which the magnetic body is embedded. Sound generating means for generating sound by exciting the sound, and detecting means for detecting a characteristic frequency of the sound generated in the delamination portion in the laminated structure in which the magnetic material is embedded, among the sounds generated by the sound generating means, At least when the characteristic frequency is generated, the delamination is detected, and the deterioration in the laminated structure in which the magnetic material is embedded is determined.

  In addition, the degradation diagnosis apparatus for a laminated structure in which a magnetic body is embedded according to the present invention is a magnetic body in the laminated structure in which the magnetic body is embedded by applying a magnetic field from the outside of the laminated structure in which the magnetic body is embedded. Sound generating means for generating sound by exciting the sound, and detecting means for detecting a characteristic frequency of the sound generated in the delamination portion in the laminated structure in which the magnetic material is embedded, among the sounds generated by the sound generating means, A delamination length obtained by conversion based on the length of the generation duration and a predetermined determination threshold, and measuring the length of the generation duration of the characteristic frequency detected by the detection means By comparing the above, it is characterized in that the deterioration progress status in the laminated structure in which the magnetic body is embedded is determined.

  According to the present invention, a method for diagnosing deterioration of a laminated structure in which a magnetic material that can easily confirm the presence / absence of delamination and the progress of delamination is obtained. In addition, according to the present invention, a deterioration diagnosis apparatus for a laminated structure in which a magnetic body capable of diagnosing the presence / absence of delamination and the progress of delamination is obtained.

  Hereinafter, an embodiment of a degradation diagnosis method for a laminated structure in which a magnetic material is embedded in the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic structural explanatory diagram of a deterioration diagnosis device used in a deterioration diagnosis method for a laminated structure in which a magnetic material according to an embodiment of the present invention is embedded. FIG. 2 is an explanatory diagram of a degradation diagnosis method for a laminated structure in which a magnetic material according to an embodiment of the present invention is embedded. FIG. 3 is a characteristic diagram (sound pressure spectrum diagram) of acoustic sound pressure and frequency obtained by the deterioration diagnosis method for a laminated structure in which a magnetic material according to an embodiment of the present invention is embedded. FIG. 4 is a sound pressure transition characteristic diagram (sound pressure waveform diagram) for one round of the laminated structure embedded with the magnetic material obtained by the deterioration diagnosis method of the laminated structure embedded with the magnetic material according to one embodiment of the present invention. ). (A) and (b) of FIG. 5 show the delamination situation of the laminated structure in which the magnetic material according to one embodiment of the present invention is embedded, and (a) shows a state in which two delamination portions have been made. It is principal part structure explanatory drawing, (b) is principal part structure description of the state which the delamination part made in two places was connected. FIG. 6 is a diagram for explaining conditions for determining the distance between delaminations as the delamination length in the degradation diagnosis method for a laminated structure in which a magnetic material according to an embodiment of the present invention is embedded. FIG. 7 is a diagram showing the relationship between the degree of deterioration progress, the deterioration content, and the determination threshold value used in the deterioration diagnosis method for a laminated structure in which a magnetic material according to an embodiment of the present invention is embedded.

  In FIG. 1, a deterioration diagnosis device 2 used for a deterioration diagnosis method of a laminated structure 1 in which a magnetic material according to an embodiment of the present invention is embedded includes an acoustic generation means 3, a detection means 4, and these acoustic generation means. 3 and a case 5 in which the detection means 4 are housed. As shown in FIG. 1, the sound generating means 3 includes at least an iron core 6 and a coil 7 wound around the iron core 6. A 100 V AC power supply 8 is connected to the coil 7, and an AC current is supplied to the coil 7. Is applied to the plurality of tensile bodies 10 in the laminated structure 1 in which the magnetic bodies are embedded, thereby exciting the plurality of tensile bodies 10 as indicated by arrows P. And at least a function of generating sound.

  The detection means 4 shown in FIG. 1 detects the characteristic frequency F (2200 to 2800 Hz) of the sound generated at the delamination portion in the laminated structure 1 in which the magnetic material is embedded, among the sounds generated by the sound generation means 3. And at least an acoustic sensor 11 for measuring, and measuring the length T of the detected generation frequency T of the characteristic frequency F and delamination obtained by conversion based on the measured length T of the generation duration By comparing the length L with predetermined threshold values H0 to H5, which will be described later, there is a function for determining the deterioration progress state (deterioration progress degree 0 to 5 described later) in the laminated structure 1 in which the magnetic material is embedded. is doing.

  The laminated structure 1 in which a magnetic body according to an embodiment of the present invention is embedded is used as, for example, a belt that connects a motor and a pulley. In the laminated structure 1 in which the magnetic material is embedded, the surface canvas layer 1A made of a rubber material, the intermediate rubber layer 1B made of a rubber material, and the central rubber layer 1C made of a rubber material are laminated, and the intermediate rubber layer Between the 1B and the center rubber layer 1C, a plurality of tensile bodies 10 made of a steel cord, which is a magnetic body, are arranged uniformly. The plurality of tensile bodies 10 are arranged in parallel along the longitudinal direction of the laminated structure 1 in which the magnetic body is embedded. In addition, the laminated structure 1 in which the magnetic material is embedded is bonded to the surface canvas layer 1A and the intermediate rubber layer 1B with an adhesive such as rubber so that no gap is generated, Even if there are a plurality of tensile bodies 10 between the rubber layer 1C, the tensile body 10 is bonded to the intermediate rubber layer 1B by an adhesive filling member such as rubber so that no gap is generated. And the center rubber layer 1C so as not to move and come close (see FIG. 1).

  In the laminated structure 1 in which the magnetic material is embedded, the delamination diagnosis device 1 causes the tensile body 10 to be peeled off when no delamination occurs between the tensile body 10 and the intermediate rubber layer 1B or the central rubber layer 1C. However, since the tensile body 10 does not vibrate, no sound is generated due to the vibration of the tensile body 10, but an interlayer is formed between the tensile body 10 and the intermediate rubber layer 1B or the central rubber layer 1C. When peeling occurs, the tensile body 10 vibrates and the vibration part of the tensile body 10 collides (contacts) with the intermediate rubber layer 1B and the central rubber layer 1C to generate sound.

  As shown in FIG. 2, the deterioration diagnosis apparatus 2 is configured to hold a laminated structure 1 in which a magnetic material is embedded, with a gap G of about 10 mm above the upper surface of the laminated structure 1 in which the magnetic material is embedded. In a state where an alternating magnetic field 9 is applied to a plurality of tensile bodies 10 in 1, the laminated structure 1 in which the magnetic material is embedded is rotated at a constant speed in the arrow Q direction so that the magnetic material is embedded. The location where the sound is generated based on the vibration of the tensile body 10 of the laminated structure 1 and the duration of the generation of the sound are measured by the detection means 4 so that the location where the delamination occurs and the length of the delamination This is a judgment.

  That is, when the tensile body 10 in the laminated structure 1 in which the magnetic material is embedded is excited by the sound generating means 3, if there is delamination in the laminated structure 1 in which the magnetic material is embedded, the interlayer The portion of the tensile body 10 located at the peeled portion vibrates and collides (contacts) with the intermediate rubber layer 1B and the central rubber layer 1C to generate sound. Therefore, the presence or absence of the acoustic characteristic frequency F (2200 to 2800H) is confirmed by creating a characteristic diagram (sound pressure spectrum diagram) of acoustic sound pressure and frequency as shown in FIG. The presence or absence of peeling can be confirmed.

  Furthermore, the generation | occurrence | production location and length of the delamination generate | occur | produced based on the vibration of the tensile body 10 of the laminated structure 1 with which the magnetic body was embedded are the laminated structure 1 with which the magnetic body was embedded by the sound generation means 3. The sound generated at the delamination portion in the laminated structure 1 in which the magnetic material is embedded is generated while the laminated structure 1 in which the magnetic material is embedded is rotated at a constant speed while exciting the tensile body 10 in the inside. It can be confirmed by detecting with the sensor 11 and creating a sound pressure transition characteristic diagram (sound pressure waveform diagram) shown in FIG. That is, in FIG. 4, the portions X1, X2, and X3 exceeding the sound pressure threshold C represent the occurrence of delamination, and the widths of the portions X1, X2, and X3 exceeding the sound pressure threshold C are , The generation duration times T1, T2, and T3 are shown.

  By converting on the basis of the lengths T1, T2, and T3 of the generation durations, the delamination lengths L1, L2, and L3 at the respective delamination locations can be obtained. And among these delamination lengths L1, L2, and L3, the longest delamination length (maximum delamination length) is compared with the determination threshold values H0 to H5 described later, so that a laminated structure in which a magnetic material is embedded. The progress of deterioration in the body 1 can be determined.

  When determining the progress of deterioration in the laminated structure 1 in which the magnetic material is embedded, the delamination lengths T1, T2, and T3 obtained on the basis of the generation durations T1, T2, and T3 are the determination threshold values. When the distance LK between the two delaminations determined as a length less than H0 to H5 is smaller than or equal to the preset limit distance LS, the two delaminations are performed. Judgment is based on the same delamination. The reason will be described next with reference to FIGS. 5A and 5B and FIG.

  Along with the deterioration in the laminated structure 1 in which the magnetic material is embedded, as shown in FIG. 5A, the two laminated layers B1 and B2 are formed in the laminated structure 1 in which the magnetic material is embedded. As shown in (b) of FIG. 5, when the deterioration occurs in the laminated structure 1 in which the magnetic body is embedded, and then the deterioration in the laminated structure 1 in which the magnetic body is embedded further proceeds, The delamination part B1 and the delamination part B2 are connected to form an delamination part B3. Therefore, if the distance between the delamination part B1 and the delamination part B2 is close, even if the delamination lengths LM and LN of the delamination part B1 and the delamination part B2 are short, a long delamination length LG is formed in a short time. It will become the delamination part B0.

  Therefore, as shown in FIG. 6, when the distance LK between the delamination part B1 and the delamination part B2 is smaller than or equal to the preset limit distance LS, the delamination part B1 When the distance LK between the interlayer peeling part B1 and the interlayer peeling part B2 is larger than the preset limit distance LS, the interlayer peeling is considered. By providing the deterioration diagnosis device 2 with a function of determining deterioration by regarding the part B1 and the delamination part B2 as separate delaminations, it is possible to make a determination that is more suitable for the actual progress of deterioration.

  The determination of the progress of deterioration of the laminated structure 1 in which the magnetic body according to the embodiment of the present invention is embedded is performed in six stages of the degree of deterioration progress 0-5. The relationship between the deterioration contents of the deterioration progress degrees 0 to 5 and the determination threshold values H0 to H5 for determining the deterioration progress degrees 0 to 5 will be described with reference to FIG.

  When the degree of deterioration progress is 0, as shown in the column of deterioration content in FIG. 7, “no deterioration” is set, and the determination threshold for the length of delamination is set to H0. When the degree of deterioration is 1, as shown in the column of deterioration content in FIG. 7, the length of delamination is determined as “the filling member that restrains the tensile body 10 has deteriorated and cracks have occurred”. Let the threshold be H1. In the case of the degree of deterioration progress 2, as shown in the column of deterioration content in FIG. 7, “between the tensile body 10 of the laminated structure 1 in which the magnetic body is embedded and the intermediate rubber layer 1B or the central rubber layer 1C. The determination threshold value of the length of delamination is set to H2 as “the gap 1D is formed and delamination is progressing”. In the case of the degradation progress degree 3, as shown in the column of degradation content in FIG. 7, “between the tensile body 10 of the laminated structure 1 in which the magnetic body is embedded and the intermediate rubber layer 1B or the central rubber layer 1C. The generated delamination is greatly progressing in the longitudinal direction of the laminated structure 1 in which the magnetic material is embedded, and the determination threshold for the delamination length is set to H3. In the case of the degradation progress degree 4, as shown in the column of degradation content in FIG. 7, “the tensile body 10 moves in the gap 1D due to delamination formed between the intermediate rubber layer 1B and the central rubber layer 1C. The threshold value for determining the length of delamination is H4. In the case of the degree of deterioration progress 5, as shown in the column of deterioration content in FIG. 7, “a bulging portion occurs in the center rubber layer 1C, or fretting wear between a plurality of tensile bodies 10 occurs. "Determining", the determination threshold for the length of delamination is set to H5.

  Note that the delamination length determination thresholds H0 to H5, the sound pressure threshold value C, and the limit distance LS respectively corresponding to the degradation progress degrees 0 to 5 are the degradation progress experiments of the laminated structure 1 in which the magnetic material is embedded. By doing so, it is set in advance and can be taken into the deterioration diagnosis device 2.

  Next, a procedure for performing the deterioration diagnosis method of the laminated structure 1 in which the magnetic material according to the embodiment of the present invention is embedded will be described.

  First, as shown in FIG. 2, the horizontal portion of the laminated structure 1 in which the magnetic material is embedded is located on the terminal portion 12 side without removing the laminated structure 1 in which the magnetic material is embedded from the guide. Deterioration diagnosis device 2 is installed above. In that case, the degradation diagnosis device 2 has a laminated structure in which the magnetic material is embedded so that the gap G between the upper surface of the laminated structure 1 in which the magnetic material is embedded and the lower surface of the deterioration diagnosis device 2 is maintained within 10 mm. Installed on the body 1.

  Next, the magnetic material is embedded in a state where an alternating current 9 is applied to the plurality of tensile members 10 in the laminated structure 1 in which the magnetic material is embedded by flowing an alternating current through the coil 7 of the deterioration diagnosis device 2. When the laminated structure 1 is made to make a round at a constant speed, the acoustic sensor 11 generates the acoustic generation location, the size, and the sound generated based on the vibration of the tensile body 10 of the laminated structure 1 in which the magnetic material is embedded. The generation duration is measured as in the sound pressure transition characteristic diagram shown in FIG.

  Next, in FIG. 4, after obtaining the delamination lengths L1, L2, and L3 of the delamination locations X1, X2, and X3 based on the measured generation duration lengths T1, T2, and T3, Of these delamination lengths L1, L2, and L3, by comparing the longest delamination length L1 with the determination thresholds H0 to H5, the delamination length L1 exceeds any determination threshold among the determination thresholds H0 to H5. It is determined whether or not the deterioration progress in the laminated structure 1 in which the magnetic material is embedded is determined. For example, when the delamination length L1 exceeds the determination threshold value H3, as shown in FIG. 7, “the tensile body 10 and the intermediate rubber layer 1B or the central rubber layer of the laminated structure 1 in which the magnetic material is embedded” It is determined that the degree of deterioration progress is 3 because the delamination that occurs between 1C and 1C has greatly progressed in the longitudinal direction of the laminated structure 1 in which the magnetic material is embedded. Further, when the delamination length L1 is larger than the determination threshold value H2 and does not exceed the determination threshold value H3, as shown in FIG. 7, “the tensile body 10 of the laminated structure 1 in which the magnetic material is embedded”. And the intermediate rubber layer 1B or the center rubber layer 1C has a gap 1D and delamination is in progress ”, and the degree of deterioration progress is determined to be 2.

  As described above, according to the method for diagnosing degradation of the laminated structure 1 in which the magnetic body according to the embodiment is embedded, the magnetic body is embedded without removing the laminated structure 1 in which the magnetic body is embedded from the guide. The presence / absence of delamination in the laminated structure 1 and the progress of the delamination, that is, the progress of deterioration in the laminated structure 1 in which the magnetic material is embedded can be easily checked, and deterioration diagnosis work can be performed. It can be performed efficiently and in a short time.

  Furthermore, according to the deterioration diagnosis method for the laminated structure 1 in which the magnetic body according to the embodiment is embedded, the tensile body of the laminated structure 1 in which the magnetic body is embedded by performing the deterioration diagnosis work periodically. 10 can be checked before it breaks, and measures such as repair and replacement can be taken before the tensile body 10 breaks. Therefore, the tensile body 10 breaks and the tensile body 10 The occurrence of an accident such as jumping out onto the surface of the laminated structure 1 in which the magnetic material is embedded can be prevented.

  Furthermore, according to the deterioration diagnosis method of the laminated structure 1 in which the magnetic body according to the embodiment is embedded, the distance LK between the delamination part B1 and the delamination part B2 is more than a preset limit distance LS. If it is smaller or equal to the limit distance LS, the delamination part B1 and the delamination part B2 are regarded as the same delamination, and the deterioration determination is made. Therefore, a determination that is more suitable for the actual progress of deterioration can be performed. it can.

  Note that the sound pressure transition characteristic diagram (sound pressure waveform diagram) shown in FIG. 4 may be displayed on the display screen of the image display device by providing an image display device in the deterioration diagnosis device 2. The apparatus 2 may be provided with a printing apparatus, and the printing apparatus may print on paper.

It is a schematic structure explanatory drawing of the degradation diagnostic apparatus used for the degradation diagnostic method of the laminated structure with which the magnetic body concerning one Embodiment of this invention was embed | buried. It is explanatory drawing of the degradation diagnostic method of the laminated structure with which the magnetic body concerning one Embodiment of this invention was embed | buried. FIG. 4 is a characteristic diagram (sound pressure spectrum diagram) of sound pressure and frequency obtained by a degradation diagnosis method for a laminated structure in which a magnetic material according to an embodiment of the present invention is embedded. FIG. 6 is a sound pressure transition characteristic diagram (sound pressure waveform diagram) for one round of a laminated structure embedded with a magnetic material obtained by a deterioration diagnosis method for a laminated structure with embedded magnetic material according to an embodiment of the present invention. The interlayer peeling state of the laminated structure with which the magnetic body concerning one Embodiment of this invention was embed | buried is shown, (a) is principal part sectional drawing of the state in which two delamination parts were made, (b) It is sectional drawing of the state which the delamination part made in two places was connected. It is a figure explaining the conditions which judge the distance between delaminations as the length of delamination in the degradation diagnostic method of the laminated structure with which the magnetic body concerning one Embodiment of this invention was embed | buried. It is a figure which shows the relationship between the deterioration progress used for the deterioration diagnostic method of the laminated structure with which the magnetic body concerning one Embodiment of this invention was embedded, deterioration content, and a determination threshold value. It is a principal part perspective view of the laminated structure in which the magnetic body concerning a prior art example was embed | buried. It is a principal part expanded sectional view of the laminated structure in which the magnetic body concerning a prior art example was embed | buried. The state of delamination of a laminated structure in which a magnetic body according to a conventional example is embedded is shown, (a) is a state explanatory diagram of a portion where delamination is performed along the longitudinal direction of the laminated structure in which a magnetic body is embedded. (B) is a state explanatory drawing of the part which carried out delamination along the direction orthogonal to the longitudinal direction of the laminated structure with which the magnetic body was embed | buried.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated structure with embedded magnetic body 1A Surface canvas layer 1B Intermediate rubber layer 1C Central rubber layer 1D Air gap due to delamination 2 Deterioration diagnostic device 3 Sound generating means 4 Detection means 5 Case 6 Iron core 7 Coil 8 AC power supply 9 Alternating magnetic field DESCRIPTION OF SYMBOLS 10 Tensile body 11 Acoustic sensor 12 Terminal part G Gap F Characteristic frequency T Length of generation duration C Sound pressure threshold L Delamination length H0-H5 Determination threshold LK Distance between delamination LS Limit distance X1, X2, X3 Location of occurrence of delamination T1, T2, T3 Length of generation duration L1, L2, L3 Delamination length obtained by conversion

Claims (6)

  By applying a magnetic field from the outside of the laminated structure in which the magnetic body is embedded as a tensile body, the magnetic body in the laminated structure in which the magnetic body is embedded is excited, and then the magnetic body is embedded by this excitation. The characteristic frequency of the sound generated at the delamination part in the laminated structure is detected, the delamination is detected by the generation of the characteristic frequency, and the deterioration in the laminated structure in which the magnetic material is embedded is judged. A degradation diagnosis method for a laminated structure in which a magnetic material is embedded.   By applying a magnetic field from the outside of the laminated structure in which the magnetic material is embedded, the magnetic material in the laminated structure in which the magnetic material is embedded is excited, and then the laminated structure in which the magnetic material is embedded by this excitation. The characteristic frequency of the sound generated at the delamination part in the body is detected, the length of the generation duration of this characteristic frequency is measured, and the delamination length obtained by conversion based on the length of the generation duration and A deterioration diagnosis method for a laminated structure embedded with a magnetic material, characterized by determining a progress of deterioration in the laminated structure with a magnetic material embedded by comparing with a predetermined determination threshold value.   The distance between two delaminations determined as a length where the delamination length obtained by conversion based on the length of the generation duration is less than the determination threshold is greater than a preset limit distance 3. The method for diagnosing deterioration of a laminated structure in which a magnetic body is embedded according to claim 2, wherein when the distance is smaller or equal to the limit distance, the two delaminations are determined as the same delamination.   When applying a magnetic field from the outside of the laminated structure in which the magnetic material is embedded, a magnetic field is applied to the tensile body of the laminated structure in which the magnetic material is embedded with a gap from above the upper surface of the laminated structure in which the magnetic material is embedded. 3. A method for diagnosing deterioration of a laminated structure in which a magnetic material according to claim 1 or 2 is embedded.   A sound generating means for generating a sound by exciting a magnetic body in the laminated structure in which the magnetic body is embedded by applying a magnetic field from the outside of the laminated structure in which the magnetic body is embedded, and the sound generating means At least detecting means for detecting a characteristic frequency of sound generated at a delamination portion in the laminated structure in which the magnetic material is embedded, and detecting the delamination by the generation of the characteristic frequency, A deterioration diagnosis device for a laminated structure in which a magnetic material is embedded, characterized in that the deterioration is determined in the laminated structure in which the magnetic material is embedded.   A sound generating means for generating sound by exciting a tensile body in the laminated structure in which the magnetic material is embedded by applying a magnetic field from the outside of the laminated structure in which the magnetic material is embedded, and generated by the sound generating means At least a detection means for detecting a characteristic frequency of the sound generated at the delamination portion in the laminated structure in which the magnetic material is embedded, and the generation time of the characteristic frequency detected by the detection means is long. Degradation progress in the laminated structure in which the magnetic material is embedded by measuring the thickness and comparing the delamination length obtained by conversion based on the length of the generation duration and a predetermined threshold value A deterioration diagnosis device for a laminated structure in which a magnetic body is embedded, characterized in that the structure is determined.

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