Open Engineering最新文献_第9页

Design optimization of a 4-bar exoskeleton with natural trajectories using unique gait-based synthesis approach 采用独特的基于步态的合成方法对具有自然轨迹的四杆外骨骼进行设计优化

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0405

A. I. Alateyah, Mohammed Nejlaoui, M. Albadrani, Abdulrahman Alrumayh, H. A. El-Hafez, Hisham A. Alrumayh, Sufyan A. Alomari, Abdulaziz H. Alomayrini, Hamad H. Albazie, W. El-Garaihy

{"title":"Design optimization of a 4-bar exoskeleton with natural trajectories using unique gait-based synthesis approach","authors":"A. I. Alateyah, Mohammed Nejlaoui, M. Albadrani, Abdulrahman Alrumayh, H. A. El-Hafez, Hisham A. Alrumayh, Sufyan A. Alomari, Abdulaziz H. Alomayrini, Hamad H. Albazie, W. El-Garaihy","doi":"10.1515/eng-2022-0405","DOIUrl":"https://doi.org/10.1515/eng-2022-0405","url":null,"abstract":"Abstract Strolling is a complex activity that requires the synchronization of the brain, anxiety, and muscles, as well as rhythmic movement of the lower limbs. Gait may be abnormal if coordination is disrupted. As a result, exoskeletons should be used to treat it effectively. The connection and other systems contained in the exoskeletons could be used to mimic the behavior of the human lower leg. These mechanisms are created utilizing complex traditional methods. This study proposes a new gait-inspired method based on a genetic algorithm (GA) for synthesizing a four-bar mechanism for exoskeletons. For each phase of the gait, the trajectory is calculated and merged using optimization algorithms. Each phase of the trajectory passes through 10 precision points, for an entirety of 20 precision points in 1 gait cycle. For the problem under consideration, it is discovered that the GA outperforms other literature techniques. Finally, the proposed design for a lower limb exoskeleton is depicted as a solid model. Furthermore, the generated link-age accurately tracks all the transition points, and the simulation of the planned linkage for one gait cycle has been illustrated using a stick diagram.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44628707","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

Design and characteristics of two-dimensional piezoelectric nanogenerators 二维压电纳米发电机的设计与特性

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0409

Z. Radeef

引用次数: 0

LLDPE matrix with LDPE and UV stabilizer additive to evaluate the interface adhesion impact on the thermal and mechanical degradation 用LDPE和UV稳定剂添加剂对LLDPE基体的界面粘附性能进行热降解和机械降解的影响评价

IF 1.7

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0429

F. Al-Attar, M. Al-Samhan, Mustafa Al-Shamali

{"title":"LLDPE matrix with LDPE and UV stabilizer additive to evaluate the interface adhesion impact on the thermal and mechanical degradation","authors":"F. Al-Attar, M. Al-Samhan, Mustafa Al-Shamali","doi":"10.1515/eng-2022-0429","DOIUrl":"https://doi.org/10.1515/eng-2022-0429","url":null,"abstract":"Abstract Linear low-density polyethylene (LLDPE) is a commodity material that has been increasingly used in various open environments owing to its versatile properties. The mechanical and thermal degradation and processability properties can be enhanced by blending with other polymers or using different types of fillers to adjust such properties to fit the required applications. The objective of this work is to investigate the polymer–polymer interface and compare it with the polymer–additive (microparticles) interface in terms of structural changes and the impact on the polymer environmental properties. The novelty of this work is how to control the adhesion at the interface to enhance selected properties of the polymer without compromising other properties. LLDPE dried resins were compounded with UV additive and different wt% content of LDPE resin separately in a twin-screw extruder at 180–200°C and 150 rpm rotating speed with a die head to produce 1 mm thickness sheets. Then the prepared specimens were cooled to ambient temperature for testing. The nuclear magnetic resonance results showed that LLDPE with microparticles has good phase adhesion compared to the blended samples with LDPE. Moreover, thermal gravimetric analysis showed that the blends decompose in two steps at high LDPE content. The morphological images revealed cavities in the microstructure of low weight percent blends inductive of the relatively weak interaction between the components. The present study conclusively demonstrates that the polymer matrix is more stable with microparticle fillers (UV stabilizer) additive than with LDPE, which impacts the environment durability for outdoor application.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46394096","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

Rehabilitation of reinforced concrete deep beams by near-surface-mounted steel reinforcement 近表面钢筋加固修复钢筋混凝土深梁

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0473

Muhammad Abed Attiya, Faris Abaas Uraiyer, Ahmed Yousif Abbas Zainul-Abideen

引用次数: 0

Extracting oil from oil shale using internal distillation (in situ retorting) 用内部蒸馏法(就地蒸馏)从油页岩中提取油

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0460

Sarah Saad Mohammed Jawad, Zainab Abdulmaged Khalaf, Safa Waleed Shakir

引用次数: 0

Influence of recycling waste hardened mortar and ceramic rubbish on the properties of flowable fill material 回收废硬化砂浆和陶瓷垃圾对流动填料性能的影响

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0470

Shatha Sadiq Hasan

{"title":"Influence of recycling waste hardened mortar and ceramic rubbish on the properties of flowable fill material","authors":"Shatha Sadiq Hasan","doi":"10.1515/eng-2022-0470","DOIUrl":"https://doi.org/10.1515/eng-2022-0470","url":null,"abstract":"Abstract Fly ash (FA) cement and water make up flowable fill material, which is also generally produced from waste and utilized in place of compacted granular fill as a cost-effective fill or backfill material. The capability to produce mixtures from various inexpensive, locally available by-products is one of the main benefits of flowable fill material. To considerably reduce costs, this study designed flowable fill mixtures utilizing cement, recycled fine aggregate (RFA; recycling waste hardened mortar and ceramic rubbish), FA, superplasticizers (SPs), and water for various uses. Initially, FA, Portland cement, fine natural aggregate, and water were combined to create a control mixture. Recycled aggregate (recycling waste hardened mortar and ceramic rubbish) was used instead of normal aggregate in various mix proportions in weights of 10, 20, 30, 40, and 50%. They performed well and conformed to the requirements of flowable fill material concerning flow consistency, unit weight, compressive strength, direct tensile strength, and thermal conductivity. Finally, when compared to ordinary concrete, flowable fill material can be produced with minimal mechanical criteria, such as a compressive strength of fewer than 5.71 MPa after 60 days and a unit weight between 1,993 and 1,961 kg/m 3 . Additionally, it was discovered that using more RFA to replace normal fine aggregate in flowable fill materials could result in a relative decrease in thermal conductivity.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135101733","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

Investigation of effect lengths and angles of the control devices below the hydraulic structure 水工构筑物下方控制装置作用长度和角度的研究

Open Engineering Pub Date : 2023-01-01 DOI: 10.1515/eng-2022-0426

Alaa Mohsin Dawood, Fadhel Abdulabbas Hassan, Hiba Ali Abbas

引用次数: 0

Spatial mixture modeling for analyzing a rainfall pattern: A case study in Ireland 用于分析降雨模式的空间混合建模：以爱尔兰为例

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0024

A. Hussein, Safaa. K. Kadhem

引用次数: 1

Producing low-cost self-consolidation concrete using sustainable material 使用可持续材料生产低成本自密实混凝土

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0368

Z. K. Abbas, Ahlam A. Abbood, Raghad S. Mahmood

{"title":"Producing low-cost self-consolidation concrete using sustainable material","authors":"Z. K. Abbas, Ahlam A. Abbood, Raghad S. Mahmood","doi":"10.1515/eng-2022-0368","DOIUrl":"https://doi.org/10.1515/eng-2022-0368","url":null,"abstract":"Abstract The disposal of the waste material is the main goal of this investigation by transformation to high-fineness powder and producing self-consolidation concrete (SCC) with less cost and more eco-friendly by reducing the cement weight, taking into consideration the fresh and strength properties. The reference mix design was prepared by adopting the European guide. Five waste materials (clay brick, ceramic, granite tiles, marble tiles, and thermostone blocks) were converted to high-fine particle size distribution and then used as 5, 10, and 15% weight replacements of cement. The improvement in strength properties is more significant when using clay bricks compared to other activated waste ceramics and granite tiles. The percentage increases to 11.59% at 28 days for compressive strength when using 10% replacement of cement weight. The ability to produce eco-SCC with less cement content and lower cost consumption is encouraged, although the enhancement in strength is not high since the waste can be disposable. While the percentage reduction in the strength of SCC mixes containing marble tile or thermostone block powder increases with the replacement of cement weight with a greater need for superplasticizer justification, we recommend using 5% as a replacement by weight of cement with an insignificant retardation of strength. Finally, there is a good relationship between compressive strength and ultrasonic pulse velocity and between tensile and flexural strength with a high R 2.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"850 - 858"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43638515","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: 5

Boundary element analysis of rotating functionally graded anisotropic fiber-reinforced magneto-thermoelastic composites 旋转功能梯度各向异性纤维增强磁热弹性复合材料的边界元分析

IF 1.7

Open Engineering Pub Date : 2022-01-01 DOI: 10.1515/eng-2022-0036

M. Fahmy, MohammedA. Almehmadi

{"title":"Boundary element analysis of rotating functionally graded anisotropic fiber-reinforced magneto-thermoelastic composites","authors":"M. Fahmy, MohammedA. Almehmadi","doi":"10.1515/eng-2022-0036","DOIUrl":"https://doi.org/10.1515/eng-2022-0036","url":null,"abstract":"Abstract The primary goal of this article is to implement a dual reciprocity boundary element method (DRBEM) to analyze problems of rotating functionally graded anisotropic fiber-reinforced magneto-thermoelastic composites. To solve the governing equations in the half-space deformation model, an implicit–implicit scheme was utilized in conjunction with the DRBEM because of its advantages, such as dealing with more complex shapes of fiber-reinforced composites and not requiring the discretization of the internal domain. So, DRBEM has low RAM and CPU usage. As a result, it is adaptable and effective for dealing with complex fiber-reinforced composite problems. For various generalized magneto-thermoelasticity theories, transient temperature, displacements, and thermal stresses have been computed numerically. The numerical results are represented graphically to demonstrate the effects of functionally graded parameters and rotation on magnetic thermal stresses in the fiber direction. To validate the proposed method, the obtained results were compared to those obtained using the normal mode method, the finite difference method, and the finite element method. The outcomes of these three methods are extremely consistent.","PeriodicalId":19512,"journal":{"name":"Open Engineering","volume":"12 1","pages":"313 - 322"},"PeriodicalIF":1.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47373827","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: 8