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基于滑模极值搜索的无级变速器夹紧力控制策略

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机械工程学报 2017年第4期53卷 105-113页

作者：韩玲安颖 sohel anwar 赵希禄长春工业大学机电工程学院长春130012 湖南大学汽车工程学院长沙410000 美国普渡大学机械学院美国印第安纳州波利斯46202 日本琦玉工业大学日本深谷369-0293

针对无级变速器传统夹紧力控制进行优化,提出基于滑模极值搜索的控制策略。建立具有非线性、离散性的滑移率数学模型,并证明无级变速器传动效率和金属带滑移率在一定速比下存在的特殊关系,设计滑模极值搜索控制器。利用该控制器对滑移... 详细信息

针对无级变速器传统夹紧力控制进行优化,提出基于滑模极值搜索的控制策略。建立具有非线性、离散性的滑移率数学模型,并证明无级变速器传动效率和金属带滑移率在一定速比下存在的特殊关系,设计滑模极值搜索控制器。利用该控制器对滑移率最优区域进行监控搜索。通过振荡过滤干扰信号的方式,收敛获取到最优滑移率。其中,以系统失稳的临界值为约束目标,通过主动轮转矩较强的抗干扰能力,显示出该控制系统具有良好的鲁棒性。为验证夹紧力控制策略的有效性及可行性,建立仿真平台及实车试验平台。仿真及实车验证结果表明:滑模极值搜索控制与传统夹紧力控制相比较,传动效率提高7.98%~9.98%,燃油效率提高1.15%,ECE+EDUC工况下系统油耗降低约5.54%。滑模极值搜索控制算法的提出,为满足整车提高燃油经济需求的可靠性、稳定性及优化空间提出了一种新方法。

关键词：无级变速器滑模极值搜索滑移率传动效率

基于滑移率反馈控制无级变速器夹紧力优化策略

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西南交通大学学报 2016年第6期51卷 1073-1079页

作者：韩玲安颖董博田丽媛 sohel anwar 长春工业大学机电工程学院吉林长春130021 湖南大学汽车工程学院湖南长沙410000 长春工业大学电气与电子工程学院吉林长春130021 美国普渡大学机械学院印第安纳印第安纳波利斯46202

为了将汽车燃油消耗率降至最低,使发动机稳定在最佳转速区域,对无级变速器(continuously variable transmission,CVT)传统夹紧力控制策略进行了优化.在CVT内部现有传感器装置的基础上,根据滑移率反馈控制方法的总体结构,建立了具有非线... 详细信息

为了将汽车燃油消耗率降至最低,使发动机稳定在最佳转速区域,对无级变速器(continuously variable transmission,CVT)传统夹紧力控制策略进行了优化.在CVT内部现有传感器装置的基础上,根据滑移率反馈控制方法的总体结构,建立了具有非线性的滑移率动态模型方程,并在设计滑移率反馈控制器过程中,采用分级内、外双环的控制方法,解决夹紧力与速比之间的耦合问题.通过台架试验及CVT整车测试,验证了优化后的夹紧力控制策略的有效性.研究结果表明:在CVT整车百公里急加速、紧急制动以及综合工况下,滑移率反馈控制令整车动力匹配能力优于传统夹紧力控制;夹紧力在满足不发生带轮打滑及使用要求前提下,夹紧力可降低10%,燃油效率总量可提高1%.

关键词：无级变速器滑移率夹紧力速比

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无级变速器电液控制系统关键技术

吉林大学学报（工学版） 2014年第5期44卷 1247-1252页

作者：韩玲张立斌安颖李春荣 sohel anwar 吉林大学交通学院长春130022 湖南大学汽车工程学院长沙410000 吉林农业大学工程技术学院长春130000 美国普渡大学机械学院印第安纳州46202

针对无级变速器(CVT)电液控制系统软件开发过程中DNR离合器控制效果一致性的问题重点进行了分析。由于参数的多样性、不确定性和时变性导致了DNR湿式离合器开环控制存在一定难题,在分析其结合过程的基础上,针对半离合点和滑摩过程的控... 详细信息

针对无级变速器(CVT)电液控制系统软件开发过程中DNR离合器控制效果一致性的问题重点进行了分析。由于参数的多样性、不确定性和时变性导致了DNR湿式离合器开环控制存在一定难题,在分析其结合过程的基础上,针对半离合点和滑摩过程的控制提出了一种自学习方法。该方法将涡轮加速度作为目标,构建了李亚普诺夫判据的二次型性能方程,制定了学习规则,从理论上确保了自学习过程的渐进收敛性。为验证上述自学习控制算法在实际应用过程中的有效性,本文在ETAS软件中对上述控制算法进行了建模,并利用快速原型仿真工具对上述算法在实车上进行了测试,试验表明应用效果良好。

关键词：汽车工程无级变速器电液控制系统 DNR湿式离合器

Analysis of Force Transmission by a Knee Loading Device from Skin and Soft Tissue to Knee Joint Elements

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Journal of Biomedical Science and Engineering 2019年第6期12卷 333-346页

作者： Samson Rayi Hiroki Yokata sohel anwar Department of Mechanical and Energy Engineering Indiana University Purdue University Indianapolis (IUPUI) Indianapolis IN USA Department of Biomedical Engineering Indiana University Purdue University Indianapolis (IUPUI) Indianapolis IN USA

Dynamic loading to a knee joint is considered to be an effective modality for enhancing the healing of long bones and cartilage that are subject to ailments like fractures, osteoarthritis, etc. We developed a knee loading device and tested it for force application. The device applies forces on the skin, whereas force transmitted to the knee joint elements is directly responsible for promoting the healing of bone and cartilage. However, it is not well understood how loads on the skin are transmitted to the cartilage, ligaments, and bone. Based on a CAD model of a human knee joint, we conducted a finite element analysis (FEA) for force transmission from the skin and soft tissue to a knee joint. In this study, 3D models of human knee joint elements were assembled in an FEA software package (SIMSOLID). A wide range of forces was applied to the skin with different thickness in order to obtain approximate force values transmitted from the skin to the joint elements. The maximum Von Mises stress and displacement distributions were estimated for different components of the knee joint. The results demonstrate that the high load bearing areas were located on the posterior portion of the cartilage. This prediction can be used to improve the design of the knee loading device.

关键词： Knee Loading Modality Loading Force Bone Healing Knee Rehabilitation Finite Element Analysis

Development of an Artificial Finger-Like Knee Loading Device to Promote Bone Health

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Journal of Biomedical Science and Engineering 2017年第11期10卷 550-561页

作者： Sandeep Korupolu Stanley Chien Hiroki Yokota sohel anwar Department of Mechanical Engineering Indiana University Purdue University Indianapolis (IUPUI) Indianapolis IN USA Department of Electrical and Computer Engineering Indiana University Purdue University Indianapolis (IUPUI) Indianapolis IN USA Department of Biomedical Engineering Indiana University Purdue University Indianapolis (IUPUI) Indianapolis IN USA

This study presents the development of an innovative artificial finger-like device that provides position specific mechanical loads at the end of the long bone and induces mechanotransduction in bone. Bone cells such as osteoblasts are the mechanosensitive cells that regulate bone remodelling. When they receive gentle, periodic mechanical loads, new bone formation is promoted. The proposed device is an under-actuated multi-fingered artificial hand with 4 fingers, each having two phalanges. These fingers are connected by mechanical linkages and operated by a worm gearing mechanism. With the help of 3D printing technology, a prototype device was built mostly using plastic materials. The experimental validation results show that the device is capable of generating necessary forces at the desired frequencies, which are suitable for the stimulation of bone cells and the promotion of bone formation. It is recommended that the device be tested in a clinical study for confirming its safety and efficacy with patients.

关键词： Osteoblasts Mechanical Loading Artificial Hand Bone Growth

插电式混合电动汽车动力系结构的非线性约束优化(英文)

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汽车安全与节能学报 2012年第1期3卷 64-70页

作者： Emrah T.YILDIZ Quazi FAROOQI sohel anwar Yaobin CHEN Afshin IZADIAN 康明斯公司哥伦布市印地安纳州IN47201美国印第安纳大学与普度大学印第安纳波里斯联合分校IUPUI机械工程系印第安纳波里斯IN46202美国 IUPUI电子与计算机工程系 IN46202美国 IUPUI工程技术系 IN46202美国

为了优化插电式混合电动汽车(PHEV)动力系(例如发动机功率、电动机功率、相关经济效率)构件尺寸,使用了"粒子群优化"(PSO)方法。对于非线性约束优化问题,PSO方法比常规优化方法更有效、经济。用动力系反洗工具箱(PSAT)方法,构建了新的... 详细信息

为了优化插电式混合电动汽车(PHEV)动力系(例如发动机功率、电动机功率、相关经济效率)构件尺寸,使用了"粒子群优化"(PSO)方法。对于非线性约束优化问题,PSO方法比常规优化方法更有效、经济。用动力系反洗工具箱(PSAT)方法,构建了新的带有优化配置的PHEV动力系的模型系。仿真计算结果表明:运用PSO优化构件的汽车,具有同等的驾驶性能,在燃料消耗上达30%的改进。

关键词：插电式混合电动汽车(PHEV) 动力系最佳化构件尺寸 “粒子群优化”(PSO)方法动力系反洗工具箱(PSAT)

The Central Cattle Breeding and Dairy Farm, Bangladesh waste contributes in emergence and spread of aminoglycoside-resistant bacteria

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Advances in Bioscience and Biotechnology 2013年第2期4卷 278-282页

作者： sohel Ahmed M. Ibrahim Hossain Tareq Hossan K. M. Rokibul Islam orhan Uddin M. Badier Rahman M. anwar Hossain Central Cattle Breeding and Dairy Farm (CCBDF) Dhaka Bangladesh Department of Biochemistry and Molecular Biology Jahangirnagar University Dhaka Bangladesh Department of Microbiology University of Dhaka Dhaka Bangladesh

Aminoglycosides are one of the categories of antibiotics most frequently used in treating several cattle diseases at the Central Cattle Breeding and Dairy Farm (CCBDF), Savar,Dhaka,Bangladesh. Untreated veterinary clinical healthcare waste (VCHW) of diseased cattle at CCBDF which directly disposed to surrounding may contribute to the antibiotic resistant bacteria pollution (ARB) pollution. The investigation analyses the role of VCHW of CCBDF in spreading ARB. Here we studied:1) veterinary clinical data and antibiotics treatment history;2) total and resistant bacteria counts in fecal samples of healthy and diseased cattles as well as VCHW of CCBDF;and 3) finally, data analysis to estimate the burden of VCHW of CCBDF in the pollution of environment with aminoglycoside antibiotics resistant bacteria. The results conclusively demonstrate the spread of 3 different aminoglycoside antibiotics, namely genta- mycin, kanamycin and streptomycin resistant bacte- ria in the surrounding environment alarmingly with high significant value (p < 0.01 - 0.05). This study re- veals the risks to the cattle as well as public health posed by the random VCHW disposal at the CCBDF, Bangladesh.

关键词： Aminoglycosides Resistant Bacteria Cattle Diseases Veterinary Clinical Healthcare Waste