Pakistan and Bangladesh have suffered a long way under the military rule where two military dictators—Zia ul Haq and Zia ur Rehman correspondingly, made the extensive use of Islam in the domain of politic, resulting into the Islamic extremism in these two countries. Bangladesh managed to overcome the issue of military involvement in politics and the corresponding Islamic extremism, Pakistan has become even more vulnerable to such undemocratic and extremist forces. This paper first briefly explores the regional and trans-regional factors involved in Islamization of these two countries. The resultant Islamic extremism in these two countries is then analyzed with the help of three major indicators: Islamization of Laws; growth of Madrassas and official patronage of the religious political parties by the two military dictators. Thus, this research is unique from the previous studies on two grounds: first it explores the interrelationship of geopolitics, military rule and Islamic extremism; second it analyzes variation in impacts of the Islamization policies in these two countries in the context of their distinct geographical settings and their corresponding importance for the big powers in diverse situations.
{"title":"GEO-POLITICS, MILITARY RULE AND ISLAMIC EXTREMISM: A COMPARATIVE STUDY OF ZIA UL HAQ AND ZIA UR REHMAN REGIMES","authors":"Habib Ullah, S. Jaleel, Taseer Ullah","doi":"10.51380/gujr-38-01-10","DOIUrl":"https://doi.org/10.51380/gujr-38-01-10","url":null,"abstract":"Pakistan and Bangladesh have suffered a long way under the military rule where two military dictators—Zia ul Haq and Zia ur Rehman correspondingly, made the extensive use of Islam in the domain of politic, resulting into the Islamic extremism in these two countries. Bangladesh managed to overcome the issue of military involvement in politics and the corresponding Islamic extremism, Pakistan has become even more vulnerable to such undemocratic and extremist forces. This paper first briefly explores the regional and trans-regional factors involved in Islamization of these two countries. The resultant Islamic extremism in these two countries is then analyzed with the help of three major indicators: Islamization of Laws; growth of Madrassas and official patronage of the religious political parties by the two military dictators. Thus, this research is unique from the previous studies on two grounds: first it explores the interrelationship of geopolitics, military rule and Islamic extremism; second it analyzes variation in impacts of the Islamization policies in these two countries in the context of their distinct geographical settings and their corresponding importance for the big powers in diverse \u0000situations.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"485 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77145137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/IJAV.2019.24.11274
Y. S. A. Rjoub, Azhar G. Hamad
In this paper, an analytical method is developed to study the free vibration of multi-cracked, axially loaded beams with differing boundary conditions, namely, hinged-hinged, clamped-clamped, clamped-hinged, and clamped-free. The cracked beam system is modelled as a number of beam segments connected by massless rotational springs with sectional flexibility. Each segment is assumed to obey the Euler-Bernoulli beam theory. The characteristic equation of the cracked beam with differing boundary conditions, which is a function of the natural frequency, sizes and location of the cracks, and the physical parameters of the beam, as well as the corresponding mode shapes, is derived using a simple transfer matrix method. In this paper, a detailed parametric study is conducted to show the effects of cracks and axial load on vibrational properties of the cracked beam. The results obtained in this study agree well with analytical results available in the literature.
{"title":"Free Vibration of Axially Loaded Multi-Cracked Beams Using the Transfer Matrix Method","authors":"Y. S. A. Rjoub, Azhar G. Hamad","doi":"10.20855/IJAV.2019.24.11274","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.11274","url":null,"abstract":"In this paper, an analytical method is developed to study the free vibration of multi-cracked, axially loaded beams\u0000with differing boundary conditions, namely, hinged-hinged, clamped-clamped, clamped-hinged, and clamped-free.\u0000The cracked beam system is modelled as a number of beam segments connected by massless rotational springs with\u0000sectional flexibility. Each segment is assumed to obey the Euler-Bernoulli beam theory. The characteristic equation\u0000of the cracked beam with differing boundary conditions, which is a function of the natural frequency, sizes and\u0000location of the cracks, and the physical parameters of the beam, as well as the corresponding mode shapes, is\u0000derived using a simple transfer matrix method. In this paper, a detailed parametric study is conducted to show the\u0000effects of cracks and axial load on vibrational properties of the cracked beam. The results obtained in this study\u0000agree well with analytical results available in the literature.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76609231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/ijav.2019.24.11255
Kundan Kumar, P. Biswas, N. Dhang
In this paper, we propose a damage detection and localization algorithm for steel truss bridges using a data-driven approach under varying environmental and loading conditions. A typical steel truss bridge is simulated in ANSYS for data generation. Damage is introduced by reducing the stiffness of one or more members of the truss bridge. The simulated acceleration time-history signals are used for the purpose of damage diagnosis purpose. Vibration data collected from healthy bridges are processed through principal component analysis (PCA) to find the reduced size weighted feature vectors in model space. Unknown test vibration data (healthy or damaged) finds the closest match of its reduced size model from the training database containing only healthy vibration data. The residual error between the spread of closest healthy vibration data and unknown test vibration data is processed to determine damage location and severity of the damage to the structure. A comparative study between a proper orthogonal decomposition (POD) based damage detection algorithm and proposed algorithm is presented. The results show that the proposed algorithm is efficient to identify the damage location and assess the severity of damage, called as the Damage Index (DI), under varying environmental and moving load conditions.
{"title":"Damage Diagnosis of Steel Truss Bridges under Varying Environmental And Loading Conditions","authors":"Kundan Kumar, P. Biswas, N. Dhang","doi":"10.20855/ijav.2019.24.11255","DOIUrl":"https://doi.org/10.20855/ijav.2019.24.11255","url":null,"abstract":"In this paper, we propose a damage detection and localization algorithm for steel truss bridges using a data-driven\u0000approach under varying environmental and loading conditions. A typical steel truss bridge is simulated in ANSYS\u0000for data generation. Damage is introduced by reducing the stiffness of one or more members of the truss bridge.\u0000The simulated acceleration time-history signals are used for the purpose of damage diagnosis purpose. Vibration\u0000data collected from healthy bridges are processed through principal component analysis (PCA) to find the reduced\u0000size weighted feature vectors in model space. Unknown test vibration data (healthy or damaged) finds the closest\u0000match of its reduced size model from the training database containing only healthy vibration data. The residual\u0000error between the spread of closest healthy vibration data and unknown test vibration data is processed to determine\u0000damage location and severity of the damage to the structure. A comparative study between a proper orthogonal\u0000decomposition (POD) based damage detection algorithm and proposed algorithm is presented. The results show\u0000that the proposed algorithm is efficient to identify the damage location and assess the severity of damage, called as\u0000the Damage Index (DI), under varying environmental and moving load conditions.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78644803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/ijav.2019.24.11121
S. Gawande, R. R. More
Beams are very important as per engineering applications is concern and it undergoes different type of loading. Because of different type of loadings there may be chance of failure of structures due to generation of notch.Therefore notch depth and its location are the main parameters for the vibration analysis of beams.The notch depth and its position may affect the natural frequency. Hence, it is essential to study the effect of notch depth and its position on modal natural frequency of the beam for the good performance and its safety. This paper work focus on the examination of these changes, which are useful for identification of notch place.The material of the beam is seleced as mild steel. In this work the comprehensive analysis of cantilever beam with and without notch has been done using analytical analysis and finite element method (FEM) with the help of ANSYS and experimentally using modern National Instruments (NI) Lab-view technique. An experimental set up was developed in which a cantilever beam was excited by a hammer and the response was obtained using an accelerometer.This method describes the relation between the various dynamics characteristics as modal natural frequency and notch depth, modal natural frequency with notch location. This paper focus on the study of dynamic properties of cantilever beams subjected to free vibration under the influence of notch at different points along the length.
{"title":"Some Investigations on Effect of Notch on Dynamics Characteristics of Cantilever Beams","authors":"S. Gawande, R. R. More","doi":"10.20855/ijav.2019.24.11121","DOIUrl":"https://doi.org/10.20855/ijav.2019.24.11121","url":null,"abstract":"Beams are very important as per engineering applications is concern and it undergoes different type of loading. Because of different type of loadings there may be chance of failure of structures due to generation of notch.Therefore\u0000notch depth and its location are the main parameters for the vibration analysis of beams.The notch depth and its\u0000position may affect the natural frequency. Hence, it is essential to study the effect of notch depth and its position\u0000on modal natural frequency of the beam for the good performance and its safety. This paper work focus on the\u0000examination of these changes, which are useful for identification of notch place.The material of the beam is seleced\u0000as mild steel. In this work the comprehensive analysis of cantilever beam with and without notch has been done\u0000using analytical analysis and finite element method (FEM) with the help of ANSYS and experimentally using modern National Instruments (NI) Lab-view technique. An experimental set up was developed in which a cantilever\u0000beam was excited by a hammer and the response was obtained using an accelerometer.This method describes the\u0000relation between the various dynamics characteristics as modal natural frequency and notch depth, modal natural\u0000frequency with notch location. This paper focus on the study of dynamic properties of cantilever beams subjected\u0000to free vibration under the influence of notch at different points along the length.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85902643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/IJAV.2019.24.11485
Yogesh S. Andhale, F. Masurkar, Nitesh P. Yelve
The Lamb wave-based localization of damage is presented here separately for the plain and riveted aluminium (Al) specimens. The first part of this paper deals with the experimental damage localization of the plain Al specimen using Lamb waves and four piezoelectric wafer (PW) transducers. The PW transducers mounted onto the specimen in a collocated way are used to actuate and sense Lamb waves. The responses are obtained for both the pristine and damaged states of the Al specimen. The signal processing is carried out on the residual response using the continuous wavelet transform (CWT), and time of arrival (TOA) data is obtained for each collocated actuator-sensor pair. The TOA data of the wave reflected from the damage is used in the two arrival time difference and astroid algorithms to locate the damage in an enclosed area. The genetic optimization (GO) method is used to further refine the location of damage within the enclosed area obtained using astroid algorithm. The second part of the paper deals with the localization of a faulty rivet in a riveted specimen. The responses are obtained in the cases of both healthy and faulty riveted specimens. The presence of a faulty rivet is indicated by the inflation in amplitude of the second harmonic. A new algorithm is therefore proposed by the authors to localize the faulty rivet, using the spectral content information. The results obtained through both the studies manifest the ability of the proposed methods for locating different types of defects and faulty rivets using an array of PW transducers.
{"title":"Localization of Damages in Plain And Riveted Aluminium Specimens using Lamb Waves","authors":"Yogesh S. Andhale, F. Masurkar, Nitesh P. Yelve","doi":"10.20855/IJAV.2019.24.11485","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.11485","url":null,"abstract":"The Lamb wave-based localization of damage is presented here separately for the plain and riveted aluminium (Al) specimens. The first part of this paper deals with the experimental damage localization of the plain Al specimen using Lamb waves and four piezoelectric wafer (PW) transducers. The PW transducers mounted onto the specimen in a collocated way are used to actuate and sense Lamb waves. The responses are obtained for both the pristine and damaged states of the Al specimen. The signal processing is carried out on the residual response using the continuous wavelet transform (CWT), and time of arrival (TOA) data is obtained for each collocated actuator-sensor pair. The TOA data of the wave reflected from the damage is used in the two arrival time difference and astroid algorithms to locate the damage in an enclosed area. The genetic optimization (GO) method is used to further refine the location of damage within the enclosed area obtained using astroid algorithm. The second part of the paper deals with the localization of a faulty rivet in a riveted specimen. The responses are obtained in the cases of both healthy and faulty riveted specimens. The presence of a faulty rivet is indicated by the inflation in amplitude of the second harmonic. A new algorithm is therefore proposed by the authors to localize the faulty rivet, using the spectral content information. The results obtained through both the studies manifest the ability of the proposed methods for locating different types of defects and faulty rivets using an array of PW transducers.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89632632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/ijav.2019.24.11161
Juan R. Juan R. Aguilar, Luz M. Tilano
Given the importance of classroom acoustics in the academic performance of school grade students, this research aims to assess the acoustical performance of a number of primary and secondary grade classrooms in public schools in Medellin, Colombia. Standardized measurements of classroom noise and reverberation time were taken in 26 classrooms located in seven public schools. The results revealed excessive noise and reverberation problems in all the classrooms assessed. The cause of this poor acoustical performance seems to be an inappropriate architectural design that prioritizes natural ventilation over classroom sound insulation and the lack of sound absorption materials to control classroom reverberation.
{"title":"Measurement of Classroom Acoustic Parameters in the Public Schools of Medellin","authors":"Juan R. Juan R. Aguilar, Luz M. Tilano","doi":"10.20855/ijav.2019.24.11161","DOIUrl":"https://doi.org/10.20855/ijav.2019.24.11161","url":null,"abstract":"Given the importance of classroom acoustics in the academic performance of school grade students, this research\u0000aims to assess the acoustical performance of a number of primary and secondary grade classrooms in public schools\u0000in Medellin, Colombia. Standardized measurements of classroom noise and reverberation time were taken in 26\u0000classrooms located in seven public schools. The results revealed excessive noise and reverberation problems in\u0000all the classrooms assessed. The cause of this poor acoustical performance seems to be an inappropriate architectural design that prioritizes natural ventilation over classroom sound insulation and the lack of sound absorption\u0000materials to control classroom reverberation.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87515379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/IJAV.2019.24.11114
S. Anand, G. Venkatachalam, Tushar D. Nikam, Omkar Jog, R. Suryawanshi
In the last few years, green composites are becoming more suitable for applications over synthetic composite. There has been a growing interest in recent years in the utilisation of natural fibres in making low-cost building material. However, these natural fibre-based composites are not fully environmentally friendly because the matrix resins are non-biodegradable. In this paper, an attempt is made to fabricate green composites with coir, banana, and aloe vera fibres as reinforcement and hybrid polymer as matrix. The hybrid polymer is prepared from natural and synthetic resins. This work intends to find the vibrational characteristics of these composites. The influence of three parameters, i.e. CNSL in hybrid polymer, fibre volume, and fibre discontinuities on vibrational characteristics are considered. This work is carried out using FEA and the FEA results are validated by experimental results.
{"title":"Determination of Vibrational Characteristics of Coir, Banana and Aloe Vera Fibres Reinforced Hybrid Polymer Matrix Composites","authors":"S. Anand, G. Venkatachalam, Tushar D. Nikam, Omkar Jog, R. Suryawanshi","doi":"10.20855/IJAV.2019.24.11114","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.11114","url":null,"abstract":"In the last few years, green composites are becoming more suitable for applications over synthetic composite.\u0000There has been a growing interest in recent years in the utilisation of natural fibres in making low-cost building\u0000material. However, these natural fibre-based composites are not fully environmentally friendly because the matrix\u0000resins are non-biodegradable. In this paper, an attempt is made to fabricate green composites with coir, banana,\u0000and aloe vera fibres as reinforcement and hybrid polymer as matrix. The hybrid polymer is prepared from natural\u0000and synthetic resins. This work intends to find the vibrational characteristics of these composites. The influence of\u0000three parameters, i.e. CNSL in hybrid polymer, fibre volume, and fibre discontinuities on vibrational characteristics\u0000are considered. This work is carried out using FEA and the FEA results are validated by experimental results.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90538440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/ijav.2019.24.11270
A. Kandil, M. Kamel
Position and velocity feedback controllers are applied in this work to reduce the oscillations of a rotating blade dynamical system running at an unsteady rotating speed. Both the primary resonance and the principal parametric resonance are controlled as they are the worst cases that were verified numerically. The two modes of vibrations are found to be powerfully linearly coupled, so we have applied the controller to only one mode and the other, coupled mode follows it. The overall nonlinear behaviour of the system with and without control is investigated through the multiple time scales method. Time history and different response curves of the controlled system are included to show the controller effect.
{"title":"Vibration Control of a Compressor Blade Using Position and Velocity Feedback","authors":"A. Kandil, M. Kamel","doi":"10.20855/ijav.2019.24.11270","DOIUrl":"https://doi.org/10.20855/ijav.2019.24.11270","url":null,"abstract":"Position and velocity feedback controllers are applied in this work to reduce the oscillations of a rotating blade dynamical system running at an unsteady rotating speed. Both the primary resonance and the principal parametric resonance are controlled as they are the worst cases that were verified numerically. The two modes of vibrations are found to be powerfully linearly coupled, so we have applied the controller to only one mode and the other, coupled mode follows it. The overall nonlinear behaviour of the system with and without control is investigated through the multiple time scales method. Time history and different response curves of the controlled system are included to show the controller effect.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73102268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/IJAV.2019.24.11382
A. J. Hull, Daniel Pérez, D. Cox
This paper derives a comprehensive analytical dynamic model of a T-shaped beam that includes in-plane and outof-plane vibrations for mid-frequency range analysis, defined here as approximately 1 kHz to 10 kHz. The web, right part of the flange, and left part of the flange of the T-beam are modelled independently with two-dimensional elasticity equations for the in-plane motion and the classical flexural plate equation for the out-of-plane motion. The differential equations are solved with unknown wave propagation coefficients multiplied by circular spatial domain functions, which are inserted into equilibrium and continuity equations at the intersection of the web and flange and into boundary conditions at the edges of the system resulting in 24 algebraic equations. These equations are solved to yield the wave propagation coefficients and this produces a solution to the displacement field in all three dimensions. An example problem is formulated and compared to solutions from Bickford beam theory and finite element analysis. Higher order branch waves are discussed and a simplified symmetric model is presented.
{"title":"A Comprehensive Analytical Dynamic Model of a T-Beam","authors":"A. J. Hull, Daniel Pérez, D. Cox","doi":"10.20855/IJAV.2019.24.11382","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.11382","url":null,"abstract":"This paper derives a comprehensive analytical dynamic model of a T-shaped beam that includes in-plane and outof-plane vibrations for mid-frequency range analysis, defined here as approximately 1 kHz to 10 kHz. The web,\u0000right part of the flange, and left part of the flange of the T-beam are modelled independently with two-dimensional\u0000elasticity equations for the in-plane motion and the classical flexural plate equation for the out-of-plane motion.\u0000The differential equations are solved with unknown wave propagation coefficients multiplied by circular spatial\u0000domain functions, which are inserted into equilibrium and continuity equations at the intersection of the web and\u0000flange and into boundary conditions at the edges of the system resulting in 24 algebraic equations. These equations\u0000are solved to yield the wave propagation coefficients and this produces a solution to the displacement field in all\u0000three dimensions. An example problem is formulated and compared to solutions from Bickford beam theory and\u0000finite element analysis. Higher order branch waves are discussed and a simplified symmetric model is presented.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89432632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-03-01DOI: 10.20855/IJAV.2019.24.11258
P. Kane, A. Andhare
Gear fault diagnosis is important not only during the routine maintenance of machinery, but also during the inspection of newly manufactured gearboxes at the end of the assembly line. This paper discusses the application of an artificial neural network (ANN) and a support vector machine (SVM) for identifying faults in the gearbox, using the psychoacoustic and conventional statistical features extracted from acoustics and vibration signals. It is observed that at the end of the assembly line, the gearbox is tested by mounting it on a test bench and driving it by an electric motor. Based on the sound emitted while running on the test bench, the operator decides on the acceptance of the gearbox for further assembly on a vehicle or machine. This method of acceptance or rejection of the gearbox involves subjectivity and it is not reliable. Hence, it is important to have a reliable and objective fault detection and diagnosis method. To eliminate subjectivity, psychoacoustic features, which are derived from the science of listening in human beings, are proposed to be used as features, along with ANN and SVMs as classifiers. To ascertain the ability of the psychoacoustic features to classify faults, laboratory experiments are carried on a test setup by simulating faults like a gear shaft misalignment, a profile error of a gear tooth, a crack at the root of the tooth, and a broken tooth. ANN and SVM are trained with the psychoacoustic features extracted from the acoustic signal and other statistical features from the acoustics and vibration signals. The trained SVM and ANN are tested for fault classification for these features and their accuracy is compared. Fault classification accuracy is found to be 95.65% for ANN and 93.44% for SVM with psychoacoustic features and is found to be better than pure statistical features obtained from the vibration and acoustic signals. With the optimised ANN and SVM architecture, SVM is found to be performing better than ANN. It is concluded that the psychoacoustic features, along with the ANN and SVM method, could be adopted at the end of assembly line inspection to make the inspection process more objective.
{"title":"End of the Assembly Line Gearbox Fault Inspection Using Artificial Neural Network and Support Vector Machines","authors":"P. Kane, A. Andhare","doi":"10.20855/IJAV.2019.24.11258","DOIUrl":"https://doi.org/10.20855/IJAV.2019.24.11258","url":null,"abstract":"Gear fault diagnosis is important not only during the routine maintenance of machinery, but also during the inspection of newly manufactured gearboxes at the end of the assembly line. This paper discusses the application\u0000of an artificial neural network (ANN) and a support vector machine (SVM) for identifying faults in the gearbox,\u0000using the psychoacoustic and conventional statistical features extracted from acoustics and vibration signals. It\u0000is observed that at the end of the assembly line, the gearbox is tested by mounting it on a test bench and driving\u0000it by an electric motor. Based on the sound emitted while running on the test bench, the operator decides on the\u0000acceptance of the gearbox for further assembly on a vehicle or machine. This method of acceptance or rejection of\u0000the gearbox involves subjectivity and it is not reliable. Hence, it is important to have a reliable and objective fault\u0000detection and diagnosis method. To eliminate subjectivity, psychoacoustic features, which are derived from the science of listening in human beings, are proposed to be used as features, along with ANN and SVMs as classifiers.\u0000To ascertain the ability of the psychoacoustic features to classify faults, laboratory experiments are carried on a test\u0000setup by simulating faults like a gear shaft misalignment, a profile error of a gear tooth, a crack at the root of the\u0000tooth, and a broken tooth. ANN and SVM are trained with the psychoacoustic features extracted from the acoustic\u0000signal and other statistical features from the acoustics and vibration signals. The trained SVM and ANN are tested\u0000for fault classification for these features and their accuracy is compared. Fault classification accuracy is found to be\u000095.65% for ANN and 93.44% for SVM with psychoacoustic features and is found to be better than pure statistical\u0000features obtained from the vibration and acoustic signals. With the optimised ANN and SVM architecture, SVM\u0000is found to be performing better than ANN. It is concluded that the psychoacoustic features, along with the ANN\u0000and SVM method, could be adopted at the end of assembly line inspection to make the inspection process more\u0000objective.","PeriodicalId":18217,"journal":{"name":"March 16","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77123168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：