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1. 发明专利

JPH0658911A METHOD AND DEVICE FOR PREDICTING LIFE OF HIGH-TEMPERATURE EQUIPMENT BY MAGNETIC AE 失效
公开(公告)号：JPH0658911A
公开(公告)日：1994-03-04
申请号：JP20884692
申请日：1992-08-05
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： SATO KAZUYA , YONEYAMA TAKAO , SUKEGAWA MASAYUKI , FUKUI HIROSHI , YANAGIBASHI MINORU , TAN TOSHIMI , ARAYA NOBORU
IPC分类号： G01N3/32 , G01N27/72 , G01N29/14
摘要： PURPOSE:To enable a turbine structure to be exchanged before breakdown by diagnosing its remaining life accurately. CONSTITUTION:The correlation relationship between the magnetic AE characteristic value and the degree of creep damage by previously performing a creep test with a same material test piece as that of a turbine structure which is manufactured by a magnetic metal, thus obtaining the magnetic AE characteristic value of the turbine structure to be measured. The degree of creep damage is obtained from the magnetic AE characteristic value and the correlation relationship and the remaining life of the turbine structure to be measured is diagnosed from the degree of creep damage. With the correlation relationship between the magnetic AE characteristic value and the degree of creep damage. the change in the magnetic AE characteristic value increases as the degree of creep damage to be measured approaches '1' indicating rupture, thus predicting the remaining life at the latter period of the life accurately.

2. 发明专利

JPH05203544A METHOD AND APPARATUS FOR AUTOMATIC CONSTRUCTION OF ABNORMALITY DIAGNOSING ALGORITHM 失效
公开(公告)号：JPH05203544A
公开(公告)日：1993-08-10
申请号：JP1214492
申请日：1992-01-27
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： SATO YOSHIYUKI , YONEYAMA TAKAO , SATO KAZUYA , TAGUCHI YUJI
IPC分类号： G01M99/00 , G01N29/14 , G05B23/00
摘要： PURPOSE:To construct an abnormality diagnosing algorithm for performing the highly accurate diagnosis by operating the specified value for the normal average value again as the virtual measured value of each measured value of a normal product when the average value of the amounts of deviations of the normal product is lower than a reference value, and forcibly making the computed value of the amount of deviation zero when the individual measured value is smaller with respect to the average value of the normal product. CONSTITUTION:Analysis objects 10 are classfied into the objects having the normal property and the objects having the abnormal property. Values with regard to various kinds of diagnostic parameters are detected with a detector 12. The output signal of the detector 12 is sent into a computor 18 through an amplifier 14 and an A/D converter 16. In the computor 18, the values with regard to a plurality of the diagnostic parameters undergo statistic processing based on the detected signal of the detector 12, and the diagnostic level is determined based on the result of the processing. When an algorithm for discriminating the normal and abnormal products is constructed, the specified value with respect to the average value of the normal product is operated again as the virtual measured value of each measured value of the normal product, when the average value of the amounts of deviations of the products of the normal group is less than a reference value. The computed value of the amount of deviation is forcibly made to be zero when the individual value is smaller with respect to the average value of the normal product.

3. 发明专利

JPH04283645A METHOD AND APPARATUS FOR DIAGNOSING ABNORMAL SOUND OF ROTARY MACHINE AND MANUFACTURING LINE OF ROTARY MACHINE 失效
公开(公告)号：JPH04283645A
公开(公告)日：1992-10-08
申请号：JP4783591
申请日：1991-03-13
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YONEYAMA TAKAO , SATO KAZUYA , KIRIHARA MASAKATSU , FUKAURA KEIGO
IPC分类号： G01M99/00
摘要： PURPOSE:To detect the presence and kind of the abnormal sound of a rotary machine from the elastic wave emitted from the rotary machine. CONSTITUTION:The elastic wave detected from a motor 1 through a sensor 2 is analyzed in frequency by a frequency analyzing and processing part 4 and, on the basis of the rotary frequency of the motor 1 from a rotary frequency detection part 7 and the generated frequency corresponding to abnormal sound from a frequency indicated region setting part 51, a voltage ratio for judging the presence of the abnormal sound corresponding to the generated frequency is calculated from the frequency analyzing result by a frequency indicated region operational processing part 50. By the comparison of the voltage ratio with a reference value, the presence and kind of the abnormal sound can be detected and displayed.

4. 发明专利

JPH0763735A METHOD AND DEVICE FOR EVALUATING QUALITY OF SUPERCONDUCTING EQUIPMENT 失效
公开(公告)号：JPH0763735A
公开(公告)日：1995-03-10
申请号：JP21060093
申请日：1993-08-25
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YONEYAMA TAKAO , SATO KAZUYA , TOMINAKA TOSHIJI , SATO YOSHIYUKI
IPC分类号： G01N29/14 , H01L39/04
摘要： PURPOSE:To provide a method and device for evaluating the quality of superconducting equipment by detecting AE signals generated during the cooling process of the superconducting equipment and evaluating the generating state of the AE signals. CONSTITUTION:Superconducting equipment 2 is put in a cryostat 1 and cooled with liquid nitrogen 3. AE sensors 4a, 4b, 4c, and 4d detect AE signals generated during the cooling process of the equipment 2 and an AE evaluating and processing section 6 analyzes and evaluates the AE signals. An acceptance discriminating section 7 discriminates the equipment 2 as unacceptable when the AE signals are generated in excess of a reference value or the generation of the AE signals is concentrated to a specific area. The section 7 identifies the defective location and improves the quality by taking a measure to make conductor movement (wire motion) to hardly occur. When such a method is used, the quality of the equipment 2 can be inspected by cooling only. Therefore, the inspection cost can be remarkably reduced, because the inspection time can be shortened. In addition, since the quality of defective products can be improved, superconducting equipment can be manufactured efficiently.

5. 发明专利

JPH04276538A METHOD AND APPARATUS FOR DIAGNOSING RUBBING OF ROTARY MACHINE 失效
公开(公告)号：JPH04276538A
公开(公告)日：1992-10-01
申请号：JP3647191
申请日：1991-03-04
申请人： HITACHI LTD , HITACHI ENG SERVICE , TODEN SEKKEI KK
发明人： YONEYAMA TAKAO , SATO KAZUYA , YANAGIBASHI MINORU , INOUE HIDENORI , MATSUMURA YUZO , FUKAZAWA TATSUAKI , NISHIMURA TADAO , ASAMI TORU
IPC分类号： G01H17/00 , G01M13/04 , G01M99/00 , G01N29/14
摘要： PURPOSE:To detect rubbing phenomenon highly accurately and to assess the generating position highly accurately regardless of the rotating speed of a rotary body. CONSTITUTION:AE sensors 3a and 3b are mounted on bearing parts 2a and 2b which are located at both ends of the rotary shaft of a rotary body 1. The AE signal levels obtained from the AE sensors 3a and 3b are made constant in amplifiers 4a and 4b. The frequencies of the signals are analyzed in a rubbing diagnosing and processing part 7 through detectors 5a and 5b. The rotating frequency components of the rotary body 1 are extracted with filters 10a and 10b. Therefore, in the rubbing diagnosing and processing part 7, the presence or absence of the occurrence of the rubbing phenomenon can be judged based on the result of the frequency analysis and the rotating frequency component. The position where the rubbing phenomenon occurs can also be assessed.

6. 发明专利

JPH09133577A METHOD AND APPARATUS FOR DETECTING ABNORMAL CONTACT 失效
公开(公告)号：JPH09133577A
公开(公告)日：1997-05-20
申请号：JP28891495
申请日：1995-11-07
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： ISHIMATSU TSUNAO , YAMAGUCHI YOSHIFUMI , MUTA YUTAKA , YOSHIDA HIROSHI , YONEYAMA TAKAO , TSUCHIDA KENJI , SATO KAZUYA , SENOO MAKOTO
IPC分类号： G01M99/00 , G01H17/00 , G01M19/00
摘要： PROBLEM TO BE SOLVED: To detect abnormal contact of a rotary hydraulic machine comprising first and second rotors. SOLUTION: When at least one of first and second rotors has a primary frequency component of rotation (R1V) higher than a predetermined level (Vss), a decision is made that the rotors are touching each other at a section 8 (Step 13). When a frequency component (RnV), i.e., the product of the primary frequency of rotation of first or second rotor and the number of blades of rotor, is higher than a predetermined level (Vst), a decision is made that the rotor is touching the case at a section 9 (Step 14). When a decision is made that the waveform level (Vm) is abnormally higher than a the predetermined level (Vst) at a section 5 (Step 15) and the decisions made at the sections 8, 9 are normal, a decision 15 then made that the rotor is touching a sealing member at a section 10. Decision results at each section are presented at a display section 12.

7. 发明专利

JPH0743352A METHOD AND DEVICE FOR AUTOMATIC CONSTRUCTION OF LEARNING TYPE ABNORMALITY DIAGNOSIS ALGORITHM 失效
公开(公告)号：JPH0743352A
公开(公告)日：1995-02-14
申请号：JP23898892
申请日：1992-08-14
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YONEYAMA TAKAO , SATO KAZUYA , TAGUCHI YUJI
IPC分类号： G01N29/14
摘要： PURPOSE:To conduct an accurate diagnosis for each type of diagnosis target by updating the combination of parameters for diagnosis and a judgment level until the judgment correct answer rate of conforming and non-conforming articles reach a target correct answer rate. CONSTITUTION:Even if an algorithm is constructed by an algorithm construction method 50, the judgment correct answer rata of conforming and non-conforming articles may not always indicate the maximum value according to selected four effective parameters and a diagnosis level. Therefore, a correct answer rate is calculated 200 first. Then, when the correct answer rate does not reach a target correct answer rate, it is instructed so that a combination of effective parameters which are different from those selected by the method 50 can be selected and also the judgment level is automatically changed to increase the correct answer rate. It is repeated until the target correct answer rate can be obtained. Further, when the target correct answer rate cannot be obtained by the processing, the combination of parameters and the judgment level are stored constantly by a maximum correct answer rate calculation means 203, thus determining 202 the combination of each parameter indicating the maximum correct answer rate to be the abnormality diagnosis algorithm.

8. 发明专利

JPH06300619A DIAGNOSTIC METHOD AND EQUIPMENT FOR ABNORMAL NOISE OF MACHINE 失效
公开(公告)号：JPH06300619A
公开(公告)日：1994-10-28
申请号：JP8985793
申请日：1993-04-16
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YONEYAMA TAKAO , SATO KAZUYA , YAMAKI YUICHI , KIKUCHI KAZUO , SATO YOSHIYUKI
IPC分类号： G01H17/00 , G01M99/00 , G01N29/14
摘要： PURPOSE:To detect a machine generating abnormal noise thoroughly. CONSTITUTION:The abnormal noise diagnostic equipment comprises a first AE sensor 2 for detecting an AE signal generated from a clutch 1 for washing machine during operation thereof, a second AE sensor 3 having detection frequency different from that of the first AE sensor 2, a spectral component extracting section 100 for extracting the spectral components of high and low frequency AE signals detected by respective sensors and the driving frequency of the machine, and a spectral component deciding section 200 for comparing the extracted spectral component with a preset reference value and discriminating between normal and abnormal sounds of the machine.

9. 发明专利

JPH06235682A METHOD AND EQUIPMENT FOR DETECTING ABNORMALITY IN SLIDING STATE 失效
公开(公告)号：JPH06235682A
公开(公告)日：1994-08-23
申请号：JP4471993
申请日：1993-02-09
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： SATO YOSHIYUKI , YONEYAMA TAKAO , TAGUCHI YUJI , SATO KAZUYA , YAMAKI YUICHI , KIKUCHI KAZUO
IPC分类号： G01H17/00 , G01M13/04 , G01N29/14
摘要： PURPOSE:To make possible highly reliable and highly accurate diagnosis by tracking the drift of waveform detected from an object to be diagnosed, i.e., a rotating machine, and extracting features from the waveform. CONSTITUTION:A sensor 2 for detecting acoustic wave is loaded to an object to be diagnosed, i.e., a rotating machine 1, and the waveform of a detected signal is split at a signal splitting section 5 into a plurality of waveforms. Parameter values are then calculated at a parameter value calculating section 6 for the split waveforms and compared each other. Features are extracted from the waveforms at a waveform feature extracting section 7 and the features are evaluated at a decision section 8 thus deciding the conditions of the rotating machine 1. In order to analyze drift of waveform in detail, even a small singular point on the waveform is evaluated and diagnosed.

10. 发明专利

JPH05312682A 失效
公开(公告)号：JPH05312682A
公开(公告)日：1993-11-22
申请号：JP12170192
申请日：1992-05-14
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： YONEYAMA TAKAO , SATO KAZUYA , SATO MINORU , NAKAZAWA TOSHIO , SATO YOSHIYUKI
IPC分类号： G01M13/04 , G01N29/14
摘要： PURPOSE:To non-destructively and correctly diagnose damage of a slide part by placing an AE sensor and determining a defective part in the slide part when an output level of an AE signal exceeds a predetermined level. CONSTITUTION:An AE sensor 2 is attached to a scroll compressor 1, and after an AH signal is amplified by an amplifier 3, the AE signal is detected by-a wave detecting circuit 4. Then an AE signal characteristic extracting part 5 is used to analyze the AE detected signal. Further a determining part 6 compares the analyzed and processed data value with a reference value to diagnose whether it is good or defective and diagnosis results are displayed on a display part 7. In this case the AE signal characteristic extracting part 5 calculates an average value of the detected AE signal, rotation primary frequency component and an overall value. The determining part 6 compares the average AE value with a first reference value K1, and one lower than the reference value is determined to be good while the rotation primary frequency component is compared with a second reference value K2 for one exceeding the reference value. If the second reference value K2 is exceeded, the part is determined to be defective, while the overall value is compared with a third reference value K3 for one not exceeding the second reference value. If the third reference value is not exceeded, it is determined to be good, otherwise it is determined to be defective.

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