Pub Date : 2014-01-01DOI: 10.4103/0976-8580.123798
V. Goel, P. Tandon, D. Khanduja, T. K. Garg
{"title":"A feature based design modeler and computational support to generate three-dimensional patterns","authors":"V. Goel, P. Tandon, D. Khanduja, T. K. Garg","doi":"10.4103/0976-8580.123798","DOIUrl":"https://doi.org/10.4103/0976-8580.123798","url":null,"abstract":"","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"12 1","pages":"18"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81185535","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 : 2014-01-01DOI: 10.4103/0976-8580.115249
B. Selvakumar, V. Raja, A. P. S. Kumar, P. Karthikeyan
{"title":"Geometrical comparison study based on numerical modeling to estimate the effective thermal conductivity of two-phase material with natural convection effect","authors":"B. Selvakumar, V. Raja, A. P. S. Kumar, P. Karthikeyan","doi":"10.4103/0976-8580.115249","DOIUrl":"https://doi.org/10.4103/0976-8580.115249","url":null,"abstract":"","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"45 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89770020","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 : 2014-01-01DOI: 10.4103/0976-8580.123802
S. Balaji, G. Thirugnanam
Beam-column joint is an important component of a reinforced concrete (RC) moment resisting frame and should be designed and detailed properly, especially when the frame is subjected to seismic forces. Many of the existing structures located in the seismic prone zone were designed and built on the basics of earlier codes with inadequate ductile reinforcement detailing. At present, even though these structures are not deteriorated, they are structurally inadequate. Hence, it becomes necessary to upgrade these structures using most economical and reliable strengthening techniques. This paper presents the investigations carried out to study the cyclic behavior of exterior beam-column joints strengthened with precast slurry infiltrated fibrous concrete (SIFCON) laminates. A total of 12 specimens corresponding to four test series were cast and tested under cyclic loading to study the load-deformation behavior, ductility associated parameters, ultimate load carrying capacity and failure characteristics. 20 mm thick precast SIFCON laminates were used to strengthen the conventional RC and fiber RC beam-column joints. For laminates, the fiber volume fraction was 9%. The steel fibers used in the study were round crimpled fibers having 0.5 mm diameter with the aspect ratio 60.
{"title":"Cyclic behavior of exterior beam-column joints strengthened with precast slurry infiltrated fibrous concrete laminates","authors":"S. Balaji, G. Thirugnanam","doi":"10.4103/0976-8580.123802","DOIUrl":"https://doi.org/10.4103/0976-8580.123802","url":null,"abstract":"Beam-column joint is an important component of a reinforced concrete (RC) moment resisting frame and should be designed and detailed properly, especially when the frame is subjected to seismic forces. Many of the existing structures located in the seismic prone zone were designed and built on the basics of earlier codes with inadequate ductile reinforcement detailing. At present, even though these structures are not deteriorated, they are structurally inadequate. Hence, it becomes necessary to upgrade these structures using most economical and reliable strengthening techniques. This paper presents the investigations carried out to study the cyclic behavior of exterior beam-column joints strengthened with precast slurry infiltrated fibrous concrete (SIFCON) laminates. A total of 12 specimens corresponding to four test series were cast and tested under cyclic loading to study the load-deformation behavior, ductility associated parameters, ultimate load carrying capacity and failure characteristics. 20 mm thick precast SIFCON laminates were used to strengthen the conventional RC and fiber RC beam-column joints. For laminates, the fiber volume fraction was 9%. The steel fibers used in the study were round crimpled fibers having 0.5 mm diameter with the aspect ratio 60.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"62 1","pages":"65"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87025057","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 : 2013-07-01DOI: 10.4103/0976-8580.113040
Sutthikom Puntimakornkij, A. Malatip, P. Dechaumphai
An adaptive nodeless variable finite element method for analysis of convectively-cooled solid is presented. The method solves two-dimensional heat transfer in solid coupling with one-dimensional heat transfer of fluid flow in channel. The nodeless variable finite element concept is introduced to increase the solution accuracy without adding the actual nodes. An adaptive finite element technique is incorporated to further improve the overall analysis solution accuracy. Several examples are presented to evaluate the performance of the proposed method by comparing the predicted solution with the exact solution and/or the solution from solving the full Navier-Stokes equations.
{"title":"Adaptive nodeless variable finite element method for convectively-cooled solid","authors":"Sutthikom Puntimakornkij, A. Malatip, P. Dechaumphai","doi":"10.4103/0976-8580.113040","DOIUrl":"https://doi.org/10.4103/0976-8580.113040","url":null,"abstract":"An adaptive nodeless variable finite element method for analysis of convectively-cooled solid is presented. The method solves two-dimensional heat transfer in solid coupling with one-dimensional heat transfer of fluid flow in channel. The nodeless variable finite element concept is introduced to increase the solution accuracy without adding the actual nodes. An adaptive finite element technique is incorporated to further improve the overall analysis solution accuracy. Several examples are presented to evaluate the performance of the proposed method by comparing the predicted solution with the exact solution and/or the solution from solving the full Navier-Stokes equations.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"33 1","pages":"65"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74493317","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 : 2013-07-01DOI: 10.4103/0976-8580.113042
A. Bayat, A. Gharekhani, Masoud Azam Mohajeran, J. Addeh
Unnatural patterns in the control charts can be associated with a specific set of assignable causes for process variation. Hence, pattern recognition is very useful in identifying process problem. In this study, we have developed an expert system that we called an expert system for control chart patterns recognition for recognition of the common types of control chart patterns (CCPs). The proposed system includes three main modules: The feature extraction module, the classifier module and the optimization module. In the feature extraction module, the multi-resolution wavelets (MRW) are proposed as the effective features for representation of CCPs. In the classifier module, the adaptive neuro-fuzzy inference system (ANFIS) is investigated. In ANFIS training, the vector of radius has a very important role for its recognition accuracy. Therefore, in the optimization module, cuckoo optimization algorithm is proposed for finding optimum vector of radius. Simulation results show that the proposed system has high recognition accuracy.
{"title":"Control chart patterns recognition using optimized adaptive neuro-fuzzy inference system and wavelet analysis","authors":"A. Bayat, A. Gharekhani, Masoud Azam Mohajeran, J. Addeh","doi":"10.4103/0976-8580.113042","DOIUrl":"https://doi.org/10.4103/0976-8580.113042","url":null,"abstract":"Unnatural patterns in the control charts can be associated with a specific set of assignable causes for process variation. Hence, pattern recognition is very useful in identifying process problem. In this study, we have developed an expert system that we called an expert system for control chart patterns recognition for recognition of the common types of control chart patterns (CCPs). The proposed system includes three main modules: The feature extraction module, the classifier module and the optimization module. In the feature extraction module, the multi-resolution wavelets (MRW) are proposed as the effective features for representation of CCPs. In the classifier module, the adaptive neuro-fuzzy inference system (ANFIS) is investigated. In ANFIS training, the vector of radius has a very important role for its recognition accuracy. Therefore, in the optimization module, cuckoo optimization algorithm is proposed for finding optimum vector of radius. Simulation results show that the proposed system has high recognition accuracy.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"66 1","pages":"76"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90178674","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 : 2013-07-01DOI: 10.4103/0976-8580.113047
M. Rajendran, Nagan Soundarapandian
Efforts are needed to develop innovative and environmentally friendly material in order to reduce the greenhouse gas emissions. An experimental investigation on the flexural behavior of thin cement-less composite plates reinforced with welded rectangular wire mesh and chicken mesh with varying number of mesh layers as well as varying concentration of alkaline solution is presented. A total of 30 slabs have been tested under flexural loading. The size of the slab is 1000 mm (length) × 200 mm (width) × 25 mm (thickness) and 1000 mm (length) × 200 mm (width) × 30 mm (thickness). The parameters studied in this investigation include varying the concentration of sodium hydroxide 8 M, 10 M, 12 M, 14 M and thickness of composite panels. In this work, cement is replaced by geopolymer mix to bind the ferrocement skeletal and its' flexural behavior are studied. It is concluded that the first crack and ultimate loads increase with the increase in the thickness of the element and the concentration of alkaline solution. From the studies, it is observed that the load carrying capacities, energy absorption, deformation at ultimate load are high in the case of geopolymer ferrocement element. Further, it is observed that there is a reduction in crack width and increase in number of cracks in the case of geopolymer ferrocement indicates delay in crack growth.
{"title":"An experimental investigation on the flexural behavior of geopolymer ferrocement slabs","authors":"M. Rajendran, Nagan Soundarapandian","doi":"10.4103/0976-8580.113047","DOIUrl":"https://doi.org/10.4103/0976-8580.113047","url":null,"abstract":"Efforts are needed to develop innovative and environmentally friendly material in order to reduce the greenhouse gas emissions. An experimental investigation on the flexural behavior of thin cement-less composite plates reinforced with welded rectangular wire mesh and chicken mesh with varying number of mesh layers as well as varying concentration of alkaline solution is presented. A total of 30 slabs have been tested under flexural loading. The size of the slab is 1000 mm (length) × 200 mm (width) × 25 mm (thickness) and 1000 mm (length) × 200 mm (width) × 30 mm (thickness). The parameters studied in this investigation include varying the concentration of sodium hydroxide 8 M, 10 M, 12 M, 14 M and thickness of composite panels. In this work, cement is replaced by geopolymer mix to bind the ferrocement skeletal and its' flexural behavior are studied. It is concluded that the first crack and ultimate loads increase with the increase in the thickness of the element and the concentration of alkaline solution. From the studies, it is observed that the load carrying capacities, energy absorption, deformation at ultimate load are high in the case of geopolymer ferrocement element. Further, it is observed that there is a reduction in crack width and increase in number of cracks in the case of geopolymer ferrocement indicates delay in crack growth.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"64 1","pages":"97"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85746205","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 : 2013-07-01DOI: 10.4103/0976-8580.113049
Anish Kumar, Vinod Kumar, J. Kumar
This study presents an investigation on wire electric discharge machining (WEDM) of pure titanium (grade-2). An attempt has been made to model the response variable dimensional deviation using the response surface methodology in a WEDM process. The experimental plan is based on Box-Behnken design. Six parameters such as pulse on time, pulse off time, peak current, spark gap voltage, wire feed, and wire tension were varied to investigate the effect on output response. The response has been optimized using the multi-objective optimization through desirability approach. The analysis of variance has been applied to identify the significance of the developed model. The test results confirm the validity and adequacy of the developed response surface methodology model. Finally, the optimum parametric setting is designed for the optimization of process .
{"title":"Effect of machining parameters on dimensional deviation in wire electric discharge machining process using pure titanium","authors":"Anish Kumar, Vinod Kumar, J. Kumar","doi":"10.4103/0976-8580.113049","DOIUrl":"https://doi.org/10.4103/0976-8580.113049","url":null,"abstract":"This study presents an investigation on wire electric discharge machining (WEDM) of pure titanium (grade-2). An attempt has been made to model the response variable dimensional deviation using the response surface methodology in a WEDM process. The experimental plan is based on Box-Behnken design. Six parameters such as pulse on time, pulse off time, peak current, spark gap voltage, wire feed, and wire tension were varied to investigate the effect on output response. The response has been optimized using the multi-objective optimization through desirability approach. The analysis of variance has been applied to identify the significance of the developed model. The test results confirm the validity and adequacy of the developed response surface methodology model. Finally, the optimum parametric setting is designed for the optimization of process .","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"5 1","pages":"105"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80768444","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 : 2013-07-01DOI: 10.4103/0976-8580.113052
Thulasimani Lakshmanan
Mobile WiMAX is a wireless technology based on IEEE802.16e for broadband wireless access. Mobile WiMAX introduces the most significant new feature, mobility to support for handovers, which can be considered as a basic requirement for mobile communication system. The mandatory handoff method is hard handoff for mobile WiMAX and other two optional soft handoff methods are macro diversity handoff and fast base station switching handoff method. Hand over delay generates during data transmission but handover delay should be less than 50ms over real time applications such as Voice Over Internet Protocol (VOIP). The existing draft standard considers only the received signal strength when deciding handover. The mobility improvement handover scheme that depends upon the velocity factor has been taken into consideration in this paper. The proposed scenario has been implemented using QualNet network simulator which has led to less handover time.
移动WiMAX是一种基于IEEE802.16e的宽带无线接入技术。移动WiMAX引入了最重要的新特性，即支持切换的移动性，这可以被认为是移动通信系统的基本要求。移动WiMAX的强制切换方法是硬切换，另外两种可选的软切换方法是宏分集切换和快速基站切换切换。在数据传输过程中会产生切换延迟，但在VOIP (Voice over Internet Protocol)等实时应用中，切换延迟应小于50ms。现有的标准草案在决定切换时只考虑接收到的信号强度。本文考虑了基于速度因子的机动性改进切换方案。使用QualNet网络模拟器实现了所提出的场景，从而减少了切换时间。
{"title":"Performance analysis of mobile wimax handoff using qualnet simulator","authors":"Thulasimani Lakshmanan","doi":"10.4103/0976-8580.113052","DOIUrl":"https://doi.org/10.4103/0976-8580.113052","url":null,"abstract":"Mobile WiMAX is a wireless technology based on IEEE802.16e for broadband wireless access. Mobile WiMAX introduces the most significant new feature, mobility to support for handovers, which can be considered as a basic requirement for mobile communication system. The mandatory handoff method is hard handoff for mobile WiMAX and other two optional soft handoff methods are macro diversity handoff and fast base station switching handoff method. Hand over delay generates during data transmission but handover delay should be less than 50ms over real time applications such as Voice Over Internet Protocol (VOIP). The existing draft standard considers only the received signal strength when deciding handover. The mobility improvement handover scheme that depends upon the velocity factor has been taken into consideration in this paper. The proposed scenario has been implemented using QualNet network simulator which has led to less handover time.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"11 1","pages":"113"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76423549","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 : 2013-07-01DOI: 10.4103/0976-8580.113041
M. Kartikeyan, J. Kaur, R. Khanna
In present work, a novel co-axial fed single layer E-shaped rectangular micro strip patch antenna with broadband behavior for wireless local area network (WLAN) and world-wide interoperability for microwave access (Wi-MAX) applications is proposed. The micro strip antenna has a planar geometry that consists of a ground, a substrate, a patch, and a feed. The basic theory about the proposed structural design, impedance matching, and the radiation characteristics are studied and analyzed using method of finite difference time domain technique. Simulation was conducted using computer simulation technology microwave studio software for optimization of antenna's properties. The proposed antenna has a frequency bandwidth of about 712 MHz (5.16-5.88 GHz) at −10 dB return loss which is sufficient to make the antenna useful for 5.2/5.8 GHz WLAN and 5.5 GHz Wi-MAX application. The WLAN standard requires the antenna to cover 5.15-5.35 GHz and 5.725-5.825 GHz frequency bands and Wi-MAX requires the antenna to cover 5.25-5.85 GHz frequency band. Maximum achievable gain over the entire frequency band is 5.5 dBi. To meet the demanding bandwidth specification, a substrate of low dielectric constant is selected to obtain a compact radiating structure. Furthermore, reflection coefficient is below −10 dB over the entire frequency band at the input of the optimized E-shaped micro strip patch antenna with 50-Ω system impedance.
{"title":"Design of co-axial fed broadband single layer rectangular microstrip patch antenna for wireless applications","authors":"M. Kartikeyan, J. Kaur, R. Khanna","doi":"10.4103/0976-8580.113041","DOIUrl":"https://doi.org/10.4103/0976-8580.113041","url":null,"abstract":"In present work, a novel co-axial fed single layer E-shaped rectangular micro strip patch antenna with broadband behavior for wireless local area network (WLAN) and world-wide interoperability for microwave access (Wi-MAX) applications is proposed. The micro strip antenna has a planar geometry that consists of a ground, a substrate, a patch, and a feed. The basic theory about the proposed structural design, impedance matching, and the radiation characteristics are studied and analyzed using method of finite difference time domain technique. Simulation was conducted using computer simulation technology microwave studio software for optimization of antenna's properties. The proposed antenna has a frequency bandwidth of about 712 MHz (5.16-5.88 GHz) at −10 dB return loss which is sufficient to make the antenna useful for 5.2/5.8 GHz WLAN and 5.5 GHz Wi-MAX application. The WLAN standard requires the antenna to cover 5.15-5.35 GHz and 5.725-5.825 GHz frequency bands and Wi-MAX requires the antenna to cover 5.25-5.85 GHz frequency band. Maximum achievable gain over the entire frequency band is 5.5 dBi. To meet the demanding bandwidth specification, a substrate of low dielectric constant is selected to obtain a compact radiating structure. Furthermore, reflection coefficient is below −10 dB over the entire frequency band at the input of the optimized E-shaped micro strip patch antenna with 50-Ω system impedance.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"138 1","pages":"71"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73125654","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 : 2013-07-01DOI: 10.4103/0976-8580.113045
Yuvaraja Mani, S. Mouleeswaran
Dynamic Vibration Absorber (DVA) can be used as an effective vibration control device. A (DVA) is essentially a secondary mass, attached to an original system via spring and damper. The natural frequency of the DVA is tuned such that it coincides with the frequency of unwanted vibration in the original system. This result in absorbing the inertial energy transferred from the primary structure. This current study aims at developing an actively tuned dynamic vibration absorber with the help of shape memory alloy (SMA) springs in order to attenuate the vibration for a range of excitation frequencies. In this study, the unique property of SMAs temperature-dependent Young's modulus has been used to change the stiffness of the spring actively to control the vibration. Experiments were carried out with SMA-based dynamic vibration absorber to study the effect of reduction in amplitude of vibration of a cantilever structure. A micro controller-based proportionate control system has been developed for timely actuation of SMA and to supply optimum current to the SMA springs, which are connected in parallel. The experimental results show that the SMA-based dynamic vibration absorber is more effective in reducing the amplitude of vibration for a wider frequency range. The effectiveness of the developed SMA-based DVA was checked in real time-piping application, and the results demonstrate that the SMA springs has good potential to be used as vibration control device.
{"title":"Smart material (sma)-based actively tuned dynamic vibration absorber for vibration control in real time applications","authors":"Yuvaraja Mani, S. Mouleeswaran","doi":"10.4103/0976-8580.113045","DOIUrl":"https://doi.org/10.4103/0976-8580.113045","url":null,"abstract":"Dynamic Vibration Absorber (DVA) can be used as an effective vibration control device. A (DVA) is essentially a secondary mass, attached to an original system via spring and damper. The natural frequency of the DVA is tuned such that it coincides with the frequency of unwanted vibration in the original system. This result in absorbing the inertial energy transferred from the primary structure. This current study aims at developing an actively tuned dynamic vibration absorber with the help of shape memory alloy (SMA) springs in order to attenuate the vibration for a range of excitation frequencies. In this study, the unique property of SMAs temperature-dependent Young's modulus has been used to change the stiffness of the spring actively to control the vibration. Experiments were carried out with SMA-based dynamic vibration absorber to study the effect of reduction in amplitude of vibration of a cantilever structure. A micro controller-based proportionate control system has been developed for timely actuation of SMA and to supply optimum current to the SMA springs, which are connected in parallel. The experimental results show that the SMA-based dynamic vibration absorber is more effective in reducing the amplitude of vibration for a wider frequency range. The effectiveness of the developed SMA-based DVA was checked in real time-piping application, and the results demonstrate that the SMA springs has good potential to be used as vibration control device.","PeriodicalId":53400,"journal":{"name":"Pakistan Journal of Engineering Technology","volume":"3 1","pages":"90"},"PeriodicalIF":0.0,"publicationDate":"2013-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85352228","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}
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