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| 1 | Pseudo-rigid-body Model for Corrugated Cantilever Beam Used in Compliant Mechanisms显示文摘Common compliant joints generally have limited range of motion,reduced fatigue life and high stress concentration.To overcome these shortcomings,periodically corrugated cantilever beam is applied to design compliant joints.Basic corrugated beam unit is modeled by using pseudo-rigid-body method.The trajectory and deformation behavior of periodically corrugated cantilever beam are estimated by the transformation of coordinate and superposition of the deformation of corrugated beam units.Finite element analysis(FEA)is carried out on corrugated cantilever beam to estimate the accuracy of the pseudo-rigid-body model.Results show that the kinetostatic behaviors obtained by this method,which has a relative error less than 6%,has good applicability and corrugated cantilever beam has the characteristics of a large range of motion and high mechanical strength.The corrugated cantilever beam is then applied to design a flexible rotational joint to obtain a larger angle output.The paper proposes a pseudo-rigid-body model for corrugated cantilever beam and designed a flexible rotational joint with large angle output. | WANG Nianfeng LIANG Xiaohe ZHANG Xianmin | 2014 | Chinese Journal of Mechanical Engineering2014，27，1： | 12 |
| 2 | Compliant mechanisms design based on pairs of curves显示文摘The success of compliant mechanism design by structural topology optimization approach depends,to a large extent,on its structural geometry representation scheme.In this work,a novel representation scheme based on pairs of curves is presented.In the representation,the structure is characterized by a set of input/output(I/O) regions.While it is still unknown how the rest of the design space will be occupied by the structure,the I/O regions must exist somewhere because any structure must have parts which interact with its surroundings by way of at least one loading region,one support region,and one output region.For a valid structural design,pairs of Bezier curves are used to connect I/O regions in order to form one single connected load-bearing structure.The boundary is explicitly described,so the need for smoothening of the blurred and jagged edges can be avoided by developing such a representation scheme to directly generate smooth boundary structures.With the scheme,shape and topology can be optimized simultaneously,and the obtained topology solutions have no check-board phenomena nor intermediate zones.A multi-objective genetic algorithm is then applied to couple with the representation scheme for defining and encoding the structural geometry in the form of graph.The solution framework is integrated with a nonlinear fixed grid finite element method(FG-FEM) code for large-displacement analyses of the compliant structures.Simulation results from a displacement inverter indicated that the proposed representation scheme is appropriate. | WANG NianFeng ZHANG XianMin | 2012 | Science China(Technological Sciences)2012，55，8： | 8 |
| 3 | Advances in dielectric elastomer actuation technology显示文摘Dielectric elastomer actuators(DEAs) have attracted much interest over the past decades due to the inherent flexibility, large strain, high efficiency, high energy density, and fast response of the material, which are known as one of the most promising candidates for artificial muscle. In this paper, we first introduce the actuation principle and electromechanical modeling approaches of dielectric elastomers(DEs). Then, the performance of different DEs material and existing compliant electrodes that are widely utilized for DEAs are presented. We also highlight the compatibility of DEs, which is suitable for a variety of actuator designs and applications. Lastly, we summarize the challenges and future development in terms of electromechanical modeling, improvement of materials including compliant electrodes and dielectric elastomer, designs and applications of novel dielectric elastomer actuators. | WANG NianFeng CUI ChaoYu GUO Hao CHEN BiCheng ZHANG XianMin | 2018 | Science China(Technological Sciences)2018，61，10： | 6 |
| 4 | Multi-objective Topology Optimization of Thermo-mechanical Compliant Mechanisms显示文摘The material characteristics of a structure will change with temperature variation,and will induce stress within the structure.Currently,the optimal design for the topology of compliant mechanisms is mainly performed in single physical field.However,when compliant mechanisms work in high temperature environments,their displacement outputs are generated not only by mechanical load,but also by the temperature variation which may become the prominent factor.Therefore,the influence of temperature must be considered in the design.In this paper,a novel optimization method for multi-objective topology of thermo-mechanical compliant mechanisms is presented.First,the thermal field is analyzed with finite-element method,where the thermal strain is taken into account in the constitutive relation,and the equivalent nodal thermal load is derived with the principle of virtual work.Then the thermal load is converted into physical loads in elastic field,and the control equation of the thermo-mechanical compliant mechanism is obtained.Second,the mathematical model of the multi-objective topology optimization is built by incorporating both the flexibility and stiffness.Meanwhile,the coupling sensitivity function and the sensitivity analysis equations of thermal steady-state response are derived.Finally,optimality criteria algorithm is employed to obtain numerical solution of the multi-objective topology optimization.Numerical examples show that the compliant mechanisms have better performance and are more applicable if the temperature effect is taken into account in the design process.The presented modeling and analysis methods provide a new idea and an effective approach to topology optimization of compliant mechanisms in electrothermic coupling field and multiphysics fields. | LI Dongmei ZHANG Xianmin GUAN Yisheng ZHANG Hong WANG Nianfeng | 2011 | Chinese Journal of Mechanical Engineering2011，24，6： | 6 |
| 5 | Stiffness Analysis of Corrugated Flexure Beam Used in Compliant Mechanisms显示文摘Conventional flexible joints generally have limited range of motion and high stress concentration. To overcome these shortcomings, corrugated flexure beam(CF beam) is designed because of its large flexibility obtained from longer overall length on the same span. The successful design of compliant mechanisms using CF beam requires manipulation of the stiffnesses as the design variables. Empirical equations of the CF beam stiffness components, except of the torsional stiffness, are obtained by curve-fitting method. The application ranges of all the parameters in each empirical equation are also discussed. The ratio of off-axis to axial stiffness is considered as a key characteristic of an effective compliant joint. And parameter study shows that the radius of semi-circular segment and the length of straight segment contribute most to the ratio. At last, CF beam is used to design translational and rotational flexible joints, which also verifies the validity of the empirical equations. CF beam with large flexibility is presented, and empirical equations of its stiffness are proposed to facilitate the design of flexible joint with large range of motion. | WANG Nianfeng LIANG Xiaohe ZHANG Xianmin | 2015 | Chinese Journal of Mechanical Engineering2015，28，4： | 6 |
| 6 | Design and Myoelectric Control of an Anthropomorphic Prosthetic Hand显示文摘这份报纸用弯曲绞链论述一只拟人的修复术的手,它被表面 electromyography (sEMG ) 控制仅仅从 2 个电极发信号。修复术的手用 5 根手指和 4 个独立致动器驾驶的自由(DoFs ) 的 4 度有紧缩的结构。当有弹性的关节和每根手指的关节被腱联合,螺旋状的弹簧被使用。能分类 8 个能抓住的手手势的 myoelectric 控制系统被造。在当最佳的特征集合和线性判别式分析(LDA ) 被利用减少尺寸,吝啬的绝对值(MAV ) ,变化(增值商) ,第四顺序的 Autoregressive (AR ) 系数和样品熵(SE ) 被选择的地方,模式识别被采用。在当前的投射特征集合和以前的集合是 “pre-smoothed” 以后,手手势的一个决定被 LDA 分类器产生,然后当当前的决定和以前的决定是 “post-smoothed” 时,最后的决定被获得从决定流动。修复术的手能为每日的生活的活动执行能抓住的姿势并且在 EMG 信号的控制下面带对象。 | Nianfeng Wang Kunyi Lao Xianmin Zhang | 2017 | Journal of Bionic Engineering2017，14，1： | 5 |
| 7 | Multichannel Surface EMG Detection and AnalysisSystem for R&D of Prostheses Controller显示文摘 | Wang Rencheng Huang Changhua Yang Nianfeng Li Bo Zhang Jichuan(Dept. of Preci. Instru., Tsinghua University, Beijing 100084,China)Li Zhengyuan(Hubei Changjiang Optoelectric Instru. Factory, Wuhan 430011, China) | 1997 | Chinese Journal of Biomedical Engineering(English Edition)1997，6，3： | 3 |
| 8 | Fabrication of ion doped WO_3 photocatalysts through bulk and surface doping显示文摘Na+doped WO3 nanowire photocatalysts were prepared by using post-treatment(surface doping) and in situ(bulk doping) doping methods. Photocatalytic degradation of Methyl Blue was tested under visible light irradiation, the results showed that 1 wt.% Na+bulk-doped WO3 performed better, with higher photoactivity than surface-doped WO3. Photoelectrochemical characterization revealed the differences in the photocatalytic process for surface doping and bulk doping. Uniform bulk doping could generate more electron–hole pairs, while minimizing the chance of electron–hole recombination. Some bulk properties such as the bandgap, Fermi level and band position could also be adjusted by bulk doping, but not by surface doping. | Xiaoying Wang Laixue Pang Xiuying Hu Nianfeng Han | 2015 | Journal of Environmental Sciences2015，27，9： | 3 |
| 9 | Application of Matter-element Model in Soil Nutrient Evaluation of Ecological Fragile Region显示文摘On the basis of the soil environment investigation in Da′an City, Jilin Province, China, 40 soil samples from main land use types were obtained and tested by standard method. Soil organic matter (SOM), total N (TN), total P (TP), total K (TK), available N (AN), available P (AP) and available K (AK) were chosen as the evaluation factors. A regional soil nutrient evaluation model was developed based on the matter-element model. The results show that the soil samples with nutrient grade Ⅱ–Ⅴ respectively account for 10%, 30%, 32.5% and 27.5%, and those with grade Ⅳ and Ⅴ account for 60% in all samples. The relationship between soil nutrients and land types indicates that the nutrients of farmland are relatively good, with 41.7% of soil samples with the nutrient grade Ⅳ and Ⅴ. The nutrients of saline-alkali land and sandy land are the worst, with 100% of soil samples with the nutrient grade Ⅳ and Ⅴ. And the ratios of soil samples grade Ⅳ and Ⅴ in grassland and wasteland are respectively 62.5 % and 54.55%. Generally speaking, the soil nutrients status in Da′an City is poor, 60% of soil samples are in poor and extremely poor conditions, indicating that the soil has been severely eroded. Being a relatively superior evaluation method with more accurate re- sults and spatial distribution consistency, matter-element analysis is more suitable for regional soil nutrient evaluation than previous models. | TANG Jie WANG Chenye LIN Nianfeng LI Zhaoyang LI Haiyi MAO Zilong | 2009 | Chinese Geographical Science2009，19，2： | 2 |
| 10 | The in vitro biological properties of Mg-Zn-Sr alloy and superiority for preparation of biodegradable intestinal anastomosis rings显示文摘 | Liu Ling Li Nianfeng Zhang Yangde | 2014 | Medical Science Monitor2014，20，： | 1 |
| 11 | Preparation of matrine ethosome,its pereutaneous permeation in vitro and anti-inflam ma tory activity in vivo in rats显示文摘 | Zhaow Z Xiaoli W Yangde Z Nianfeng L | 2009 | J Liposome Res2009，19，： | 1 |
| 12 | Relationship between saline–alkali soil formation and neotectonic movement in Songnen Plain, China显示文摘 | Jianmin Bian Jie Tang Nianfeng Lin | 2008 | Environmental Geology2008，，7： | 1 |
| 13 | Preparation, morphology, and mechanical properties of elastomers based on α,ω-dihydroxy polydimethylsiloxane/polystyrene blends 显示文摘 | Dong Jian Liu Zonglin Han Nianfeng | 2004 | J Appl Polym Sci2004，92，6： | 1 |
| 14 | Some problems of ecological environmental geology in arid and semiarid areas of China 显示文摘 | Tang Jie Lin Nianfeng | 1995 | Environmental Geology1995，26，1： | 1 |
| 15 | Poly( silyl ester) s : A new route of synthesis via condensation of di-tert-butyl ester of dicarboxylic acid with dichlorosilane 显示文摘 | Liu Zouglln Hart Nianfeng Dong Jian | 2006 | J Appl Polym Sci2006，100，2： | 1 |
| 16 | Some Problems of ecological environmental geology in arid and semiarid areas of China显示文摘 | Jie T Nianfeng L | 1995 | Environmental Geology1995，26，1： | 1 |
| 17 | Treatment of Budd-Chiari syndrome with inferior vena cava thrombosis显示文摘 | Ruihua Wang Qingyi Meng Lifeng Qu Xuejun Wu Nianfeng Sun Xing Jin | 2013 | Experimental and Therapeutic Medicine2013，，4： | 1 |
| 18 | Some Problems of ecological environmental geology in arid and semiarid areas of China显示文摘 | Tang Jie Lin Nianfeng | 1995 | Environmental Geology1995，，26： | 1 |
| 19 | Functions of Russian Melilotus officinalis on Degraded Soil Improvement显示文摘To improve the serious situation of soil degradation in China,tests were carried out to study the improvement effects of Russian Melilotus officinalis on the low base saturation acid soil,the alkaline-saline soil and the heavy metal contaminated soil. The results showed that M. officinalis could improve the low base saturation acid soil,increase the salt,alkali content,mineral nutrition and organic nutrient,which indicated that M. officinalis could be planted in the acid soil,and had a significant ecological effect on soil improvement. M. officinalis achieved a remarkable effect on improving the alkaline-saline soil( pH 8. 5-9. 5) that the soil desalted,dealkalized and had more organic nutrient. Moreover,M. officinalis could improve the heavy metal contaminated soil and had the ability to enrich and transform heavy metal elements,especially Cd and Ni,thereby presenting significant repair effects on soil improvement. Therefore,Russian M. officinalis had multiple-effects on degraded soil improvement,so it is worthy of application and popularization. | Shuo LIANG Nianfeng LIN Jie TANG Yuefen LI | 2018 | Agricultural Biotechnology2018，7，5： | 1 |
| 20 | Preparation, morphology, and mechanical properties of elastomers based on α,ω-dihydroxy polydimethylsiloxane/polystyrcne blends显示文摘 | Dong Jian Liu Zonglin Han Nianfeng | 2004 | J Appl Polym Sci2004，92，6： | 1 |
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