Pakistan Journal of Engineering Technology最新文献_第8页

A feature based design modeler and computational support to generate three-dimensional patterns 基于特征的设计建模器和计算支持生成三维图案

Pakistan Journal of Engineering Technology Pub Date : 2014-01-01 DOI: 10.4103/0976-8580.123798

V. Goel, P. Tandon, D. Khanduja, T. K. Garg

引用次数: 0

Geometrical comparison study based on numerical modeling to estimate the effective thermal conductivity of two-phase material with natural convection effect 基于数值模拟的两相材料有效导热系数估算的几何对比研究

Pakistan Journal of Engineering Technology Pub Date : 2014-01-01 DOI: 10.4103/0976-8580.115249

B. Selvakumar, V. Raja, A. P. S. Kumar, P. Karthikeyan

引用次数: 3

Cyclic behavior of exterior beam-column joints strengthened with precast slurry infiltrated fibrous concrete laminates 预制浆液浸润纤维混凝土层合板加固外梁柱节点的循环性能

Pakistan Journal of Engineering Technology Pub Date : 2014-01-01 DOI: 10.4103/0976-8580.123802

S. Balaji, G. Thirugnanam

{"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}

引用次数: 6

Adaptive nodeless variable finite element method for convectively-cooled solid 对流冷却固体的自适应无节点变量有限元法

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113040

Sutthikom Puntimakornkij, A. Malatip, P. Dechaumphai

引用次数: 0

Control chart patterns recognition using optimized adaptive neuro-fuzzy inference system and wavelet analysis 基于优化自适应神经模糊推理系统和小波分析的控制图模式识别

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113042

A. Bayat, A. Gharekhani, Masoud Azam Mohajeran, J. Addeh

引用次数: 9

An experimental investigation on the flexural behavior of geopolymer ferrocement slabs 地聚合物铁板抗弯性能试验研究

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113047

M. Rajendran, Nagan Soundarapandian

{"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}

引用次数: 28

Effect of machining parameters on dimensional deviation in wire electric discharge machining process using pure titanium 纯钛丝电火花加工工艺中加工参数对尺寸偏差的影响

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113049

Anish Kumar, Vinod Kumar, J. Kumar

引用次数: 8

Performance analysis of mobile wimax handoff using qualnet simulator 基于qualnet模拟器的移动wimax切换性能分析

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113052

Thulasimani Lakshmanan

引用次数: 1

Design of co-axial fed broadband single layer rectangular microstrip patch antenna for wireless applications 无线同轴馈电宽带单层矩形微带贴片天线的设计

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113041

M. Kartikeyan, J. Kaur, R. Khanna

{"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}

引用次数: 9

Smart material (sma)-based actively tuned dynamic vibration absorber for vibration control in real time applications 基于智能材料(sma)的主动调谐动态减振器，用于实时振动控制应用

Pakistan Journal of Engineering Technology Pub Date : 2013-07-01 DOI: 10.4103/0976-8580.113045

Yuvaraja Mani, S. Mouleeswaran

{"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}

引用次数: 1