Diyala Journal of Engineering Sciences最新文献_第9页

Prosthetic Ankle Design and Performance Evaluation by Experimental Gait Comparison 基于实验步态对比的假肢踝关节设计与性能评价

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15205

Mohammed Ismael Hameed, Ahmed Abdul Hussein

{"title":"Prosthetic Ankle Design and Performance Evaluation by Experimental Gait Comparison","authors":"Mohammed Ismael Hameed, Ahmed Abdul Hussein","doi":"10.24237/djes.2022.15205","DOIUrl":"https://doi.org/10.24237/djes.2022.15205","url":null,"abstract":"There are millions of persons in this world have been suffered from land mines or other accidental events which have caused amputations. The human body feet provide stability and balance when standing and moving. Amputation of a foot highly decrease the amputee’s ability to practice common activities such as walking. The main target of a prostheses of any kind is to improve or return function to a physically disabled person. Although, the rapid developing of alternative prostheses technology, unfortunately, it is still a far from inquiring quite functional prosthetic limb replacement. The present study was focused on design and manufacturing of a two degree of freedom ankle rotation, plantar flexion- dorsiflexion in sagittal plane and inversion - eversion in frontal plain so as to mimic the normal human gait and also to reduce the pain and stress in the residual limb. Most ankle parts were formed from aluminum alloy and assembled to a carbon fiber foot laminated foot. The gait analysis was performed by the amputee user case study for both his prosthetic foot and the designed foot at the same optional ground surface conditions. The user foot angles responses were: eversion 2.60, inversion 2.60, plantar 8.70, dorsi 5.30, in contrast, the designed foot angles were: eversion 9.50, inversion 9.80, plantar 10.20, dorsi 10.40. The achieved designed maximum rolling in frontal plane was 100 inversion- eversion angle and the maximum rolling in sagittal plane were 120, 180 for plantar and dorsi flexion angle respectively.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117248979","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: 0

Structural Performance of Semi-Rigid Connection Steel Frames 半刚性连接钢框架的结构性能

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15207

Raghdah H. Al-Sherif, Murtada A. Ismael

{"title":"Structural Performance of Semi-Rigid Connection Steel Frames","authors":"Raghdah H. Al-Sherif, Murtada A. Ismael","doi":"10.24237/djes.2022.15207","DOIUrl":"https://doi.org/10.24237/djes.2022.15207","url":null,"abstract":"In most engineering designs, steel connections are usually considered as fully rigid connections or perfectly pinned connections, for simplicity of design work. In reality, this assumption is incorrect. The behaviour of the beam-column connection is in between of rigid connection and perfectly pinned connection. This type of connection is termed semi-rigid connection. This article represents a numerical analysis using finite element method of structural steel frames to investigate the effect of semi-rigid beam-column connection on the behaviour of the frame. ANSYS software was used for the finite element modelling of the frames. The beam-column connection was modelled as rotational spring with specified rotational stiffness using COMBIN14 element. The study includes investigation the effect of semi-rigid on different study cases such as: support types and number of stories. The obtained results reveal that changing the beam-column connection from rigid case to semi-rigid case with different rotational stiffness can increase the vertical and horizontal displacement of the frame with a percentage depends on the rotational stiffness of the beam-column connection. Changing the support type of the frame from fixed to pinned support or increasing the number of stories with semi-rigid connection can decrease the strength capacity of the frame. This indicates the importance of including the semi-rigid connection in the design and analysis of steel frames to obtain more realistic results.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122225367","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

Numerical Analysis of Fatigue Life and strength of AA5052 Aluminum Alloy Reinforced with ZrO2, TiO2 and Al2O3 Nanoparticles ZrO2、TiO2和Al2O3纳米颗粒增强AA5052铝合金疲劳寿命和强度的数值分析

Diyala Journal of Engineering Sciences Pub Date : 2022-06-01 DOI: 10.24237/djes.2022.15208

Baqir Ibraheem, Salem F. Salman, Abdul-jabar H. Ali

{"title":"Numerical Analysis of Fatigue Life and strength of AA5052 Aluminum Alloy Reinforced with ZrO2, TiO2 and Al2O3 Nanoparticles","authors":"Baqir Ibraheem, Salem F. Salman, Abdul-jabar H. Ali","doi":"10.24237/djes.2022.15208","DOIUrl":"https://doi.org/10.24237/djes.2022.15208","url":null,"abstract":"In this study, the finite element method using ANSYS workbench 16.1 has been successfully used to predict the fatigue life, fatigue strength, and the factors of safety for the as cast AA5052 as arrow matrix and its composites: AA5052/7 wt% ZrO2, AA5052/7 wt% TiO2 and AA5052/7 wt% Al2O3. The Finite Element Analysis (FEA) model was building according to dimensions of the experimental fatigue specimen. The total number of elements was 504 elements with a total number of nodes of 2572 nodes. The numerical fatigue test was processed under static structural analysis, and it has been analyzed using fatigue tool on ANSYS, Goodman theory was used for the prediction of life. The FEM using ANSYS.16.1 workbench simulation showed a good agreement with the experimental results for all the stress life curves and the highest difference in fatigue life was 17% and the lowest was 1.4%, for ZrO2 composite, while the maximum overall average error was 2.031% for AA5052 and the lowest was 0.378%, for Al2O3 composite. The maximum difference about 4.14 % between the experimental and numerical fatigue strength at 107 cycles for the row matrix and less than for the composites, also the minimum factor of safety for the AA5052 alloy is 0.8327 and for AA5052/7 wt% ZrO2 composite is 1.0709 while for both AA5052/7wt%TiO2 and AA5052/7 wt% Al2O3 composites are 1.0707 at specific design life.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"175 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131558548","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: 0

The Effect of the Concrete Elimination Ratio on The Structural Behavior of Bubbled Reinforced Concrete Slabs 混凝土消消比对钢筋混凝土鼓泡板结构性能的影响

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15110

Yahya Hameed

引用次数: 0

Resilient Selection as a Mechanism for Adapting Iraqi Architecture to the Trends of Modernity 弹性选择是使伊拉克建筑适应现代性趋势的机制

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15111

Hasan Hadi Sabti, A. Al-Saidi, Mohammed Gassed, Haitham Al-shamari

{"title":"Resilient Selection as a Mechanism for Adapting Iraqi Architecture to the Trends of Modernity","authors":"Hasan Hadi Sabti, A. Al-Saidi, Mohammed Gassed, Haitham Al-shamari","doi":"10.24237/djes.2022.15111","DOIUrl":"https://doi.org/10.24237/djes.2022.15111","url":null,"abstract":"The contemporary products of the Iraqi architecture were no longer keeping pace with modernity and global developments. It was mixed with many styles of architecture over periods. The entry of modern architecture into Baghdad led to an accelerated change in the general morphological shape of the city through multi-story high buildings in the middle of the horizontal fabric. The aim of this research was to bring Iraqi architecture from the narrowness to the open ends as adaptive architecture. The research assumed that any building consistent with its general contents could be modified to the resilient selection procedure. The study used a descriptive analytical method in conjunction with a critical approach. A survey of architects and planners in Iraq was also performed. The method divided into three items; harmonization obstacles, the foundations of adaptive architecture and general Iraqi cultural contents. It made an evaluation and estimation the characteristics of the modernity movement within the concept of adaptive architecture. The methodology used qualitative approach based on the survey method (questionnaire). The results extracted indicated that the positive characteristics can unify the vision of modern architecture and urban trends towards adaptive architecture. The research concludes that adaptive architecture in Iraq was a sustainable and valuable in harmony with the contents of the common local culture. So, it could be considered as an adaptive architecture.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131192375","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: 0

Segmentation of Human Brain Gliomas Tumour Images using U-Net Architecture with Transfer Learning 基于迁移学习的U-Net结构人脑胶质瘤图像分割

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15102

Assalah Zaki Alali, Khawla Hussein Ali

{"title":"Segmentation of Human Brain Gliomas Tumour Images using U-Net Architecture with Transfer Learning","authors":"Assalah Zaki Alali, Khawla Hussein Ali","doi":"10.24237/djes.2022.15102","DOIUrl":"https://doi.org/10.24237/djes.2022.15102","url":null,"abstract":"The complexity of segmenting a brain tumour is critical in medical image processing. Treatment options and patient survival rates can only be improved if brain tumours can be prevented and treated. Segmentation of the brain is the most complex and time-consuming task to diagnose cancer utilizing a manual approach for numerous magnetic resonance images (MRI). The aim of MRI brain tumour image segmentation that to build an automated magnetic resonance imaging tumour segmentation system with separate the area of tumour and provided a clear boundary of the tumour region. U-Nets with different transfer learning models as backbones are presented in this paper, there are ResNet50, DenseNet169 and EfficientNet-B7. Brain lesion segmentation is performed using the multimodal brain tumor segmentation challenge 2020 dataset (BraTS2020). Based on MRI scans of the brain, the tumor segmentation technique is assessed using F1-score, Dice loss, and intersection over union score (IoU). The U-Net encoder used with EfficientNet-B7 outperforms all other architectures in terms of performance metrics across the board. Overall, the results of this experiment are rather excellent. The Dice-loss score was 0.009435, and the score of IoU was 0.7435, F1-score was 0.9848, accuracy was 0.9924, precision was 0.9829, recall was 0.9868, and specificity was 0.9943. The U-Net with EfficientNet-B7 architecture was shown to be crucial in the treatment of brain tumors, according to the findings of the experiments","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114901977","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

Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate 改变螺距双盘管对总换热率的影响

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15104

Ali Najm, Itimad Dawood Jumaah, A. M. A. Karim

{"title":"Effect of Using A Double Coil Tube with Modified Pitch on The Overall Heat Transfer Rate","authors":"Ali Najm, Itimad Dawood Jumaah, A. M. A. Karim","doi":"10.24237/djes.2022.15104","DOIUrl":"https://doi.org/10.24237/djes.2022.15104","url":null,"abstract":"The goal of this work was to design a simple and cost-effective technique for improving the performance of heat exchangers, and the emphasis was on the experimental side while not neglecting the necessity of validating our findings with theoretical results using CFD. A new method was used to enhance the heat transfer inside the heat exchanger by using a coil with modified steps, as the published papers did not previously address this method, which proved its effectiveness. For varied coil pitches, the numerical findings were in good agreement with the experimentally obtained results, with an error rate of less than 8%. To compare results and confirm effective correlation between pitch changes, a double coil tube is manufactured with a fixed pitch and a double coil tube with modified pitches, while maintaining the basic design parameters of tube diameter ( ), shell diameter ( ), height of shell ( ), and coil height ( ) in order to try to increase the overall heat transfer coefficient and heat transfer. This new design enhanced heat transfer and total heat transfer coefficient at Reynolds number (400< <2000), with a 22% improvement in overall heat transfer coefficient. The new design of the coil (modified pitch) also gave an improvement in the flow distribution, which generated a higher secondary flow than the traditional pitch coil.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132881833","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

Prediction of Gypseous Soil Settlement Using Artificial Neural Network (ANN) 基于人工神经网络的石膏土沉降预测

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15109

Hala Habeeb Shallal, Qasim Adnan Aljanabi

引用次数: 3

Development of Steel Structure with Rigid Connection Subjected to Horizontal Cyclic Load By Using Rubber Washer 橡胶垫圈水平循环荷载作用下刚性连接钢结构的研究

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15112

Qader A. Mohammed, Amer M. Ibrahim, Teeba A. Jassim

{"title":"Development of Steel Structure with Rigid Connection Subjected to Horizontal Cyclic Load By Using Rubber Washer","authors":"Qader A. Mohammed, Amer M. Ibrahim, Teeba A. Jassim","doi":"10.24237/djes.2022.15112","DOIUrl":"https://doi.org/10.24237/djes.2022.15112","url":null,"abstract":"An earthquake is a dangerous natural phenomenon that exposes buildings to collapse and human life to danger. Due to the weakness and cost of design and implementation by seismic design requirements. Therefore, a way must be found to reduce the impact of the earthquake risk, by using the smart joints technology in steel structures. Two experimental models were analyzed theoretically, The results showed a great convergence between the experimental and theoretical programs. The case study is a numerical study containing four rigid specimens that were analyzed in the ABAQUS / CAS (2017) program with applied a horizontal quasi-static cyclic load. The difference between these samples is the difference in thickness of the rubber washer used in the specimen where it is placed under the bolt head in the beam-column connection of the rigid steel frame. Two bolts connect the column with the angle, and the beam with the angle at the top, bottom, in both sides, and two bolts that connect the beam with the shear tab (ST), and in both sides too. Thus, the total number of bolts is twenty and the total number of rubber washer are forty. The results showed that the resistant load of the model containing rubber washer with the thickness (1,2,3 mm) in the beam-column connection increased by (11.5%, 33.8%, and 47.3%), respectively, as well as a significant improvement in the cumulative energy, the ductility residual displacement, The ductility index, The drift ratio, and the equivalent viscous damping compared to the model without rubber.","PeriodicalId":294128,"journal":{"name":"Diyala Journal of Engineering Sciences","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116141041","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: 0

Determinations of Compression Buckling for Long and Intermediate Aluminum Alloy 2014-T4 Columns 长铝合金和中间铝合金2014-T4柱压缩屈曲的测定

Diyala Journal of Engineering Sciences Pub Date : 2022-03-15 DOI: 10.24237/djes.2022.15106

Saad T. Faris, Amjad M. Bader

引用次数: 0