检索结果-南通市图书馆

Special Issue on Electromechanical Coupling Design for Electronic Equipment

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第3期30卷 495-496页

作者： Bao Yan DUAN jian rong tan Key Laboratory of Electronic Equipment Structure Design of Ministry of Education Xidian University State Key Lab of CAD&CG Zhejiang University

With the development of electronic equipment to high accuracy, high density, high frequency, and atrocious ser- vice environment, the functional surface in this type of equipment has increasingly serious problems,

关键词： In Special Issue on Electromechanical Coupling Design for Electronic Equipment Design

Predictive defect detection for prototype additive manufacturing based on multi-layer susceptibility discrimination

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2023年第3期11卷 407-427页

作者： Jing-Hua Xu Lin-Xuan Wang Shu-You Zhang jian-rong tan State Key Lab of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058People's Republic of China Zhejiang Key Lab of Advanced Manufacturing Technology Zhejiang UniversityHangzhou 310058People's Republic of China Engineering Research Centre for Design Engineering and Digital Twin of Zhejiang Province Hangzhou 310058People's Republic of China Zhejiang-Singapore Innovation and AI Joint Research Lab Hangzhou 310027People's Republic of China

This paper presents a predictive defect detection method for prototype additive manufacturing(AM)based on multilayer susceptibility discrimination(MSD).Most current methods are significantly limited by merely captured images,disregarding the differences between layer-by-layer manufacturing approaches,without combining transcendental *** visible parts,originating from the prototype of conceptual design,are determined based on spherical flipping and convex hull theory,on the basis of which theoretical template image(TTI)is rendered according to photorealistic *** addition,to jointly consider the differences in AM processes,the finite element method(FEM)of transient thermal-structure coupled analysis was conducted to probe susceptible regions where defects appeared with a higher *** by prior knowledge acquired from the FEM analysis,the MSD with an adaptive threshold,which discriminated the sensitivity and susceptibility of each layer,was implemented to determine *** anomalous regions were detected and refined by superimposing multiple-layer anomalous regions and comparing the structural features extracted using the Chan-Vese(CV)model.A physical experiment was performed via digital light processing(DLP)with photosensitive resin of a non-faceted scaled V-shaped engine block prototype with cylindrical holes using a non-contact *** MSD method is practical for detecting defects and is valuable for a deeper exploration of barely visible impact damage(BVID),thereby reducing the defect of prototypical mechanical parts in engineering machinery or process equipment via intellectualized machinevision.

关键词： Predictive defects detection Additive manufacturing(AM) Convex hull theory Finite element method(FEM) Multi-layer susceptibility discrimination(MSD)

Collisionless tool orientation smoothing above blade stream surface using NURBS envelope

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第3期14卷 187-197页

作者： Jing-hua XU Shu-you ZHANG jian-rong tan Ri-na SA State Key Laboratory of Fluid Power Transmission and Control Zhejiang University

In five-axis machining,tool orientation above a blade stream surface may lead to tool collision and a decrease in workpiece ***,collisionless tool orientation smoothing(TOS)becomes an important *** the basis of a constant scallop height tool path,the triangular facets in the faces,vertices format are constructed from cutter contact(CC)using the Voronoi incremental *** cutter location(CL)points candidate set is represented by an oblique elliptic cone whose vertex lies at CC using NURBS *** the CL point is above its CC is judged by the dot product between the normal vector and the point on triangulation nearest to the CL *** curvatures at CC are obtained by fitting a moving least square(MLS) quadratic patch to the local neighborhood of a vertex and calculating eigenvectors and eigenvalues of the Hessian *** surface elastic energy is employed as the weight in selection from the NURBS *** collision is judged by NURBS surface *** can then be expressed by selecting a CL point for each CC point and converted into a numerical control(NC)code automatically according to the postprocessor type of the machine *** proposed method is verified by finishing of a cryogenic turboexpander impeller of air separation equipment.

关键词： Tool orientation smoothing(TOS) Blade stream surface Triangular facet NURBS envelope Surface elastic energy

Light-Weight Design Method for Force-Performance-Structure of Complex Structural Part Based Co-operative Optimization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2018年第2期31卷 115-123页

作者： Ya-Li Ma jian-rong tan De-Lun Wang Zi-Zhe Liu School of Mechanical Engineering Dalian University of Technology School of Mechanical Engineering Zhejiang University

A light?weight design method of integrated structural topology and size co?optimization for the force?performance?structure of complex structural parts is presented in this paper. Firstly, the supporting function of a complex structural part is built to map the force transmission, where the force exerted areas and constraints are considered as connecting structure and the structural configuration, to determine the part performance as well as the force routines. Then the connecting structure design model, aiming to optimize the static and dynamic performances on connection configuration, is developed, and the optimum design of the characteristic parameters is carried out by means of the collaborative optimization method, namely, the integrated structural topology optimization and size optimization. In this design model, the objective is to maximize the connecting stiffness. Based on the relationship between the force and the structural configuration of a part, the optimal force transmission routine that can meet the performance requirements is obtained using the structural topology optimization technology. Accordingly, the light?weight design of conceptual configuration for complex parts under multi?objective and multi?condition can be realized. Finally, based on the proposed collaborative optimization design method, the optimal performance and optimal structure of the complex parts with light weight are realized, and the reasonable structural unit configuration and size charac?teristic parameters are obtained. A bed structure of gantry?type machining center is designed by using the proposed light?weight structure design method in this paper, as an illustrative example. The bed after the design optimization is lighter 8% than original one, and the rail deformation is reduced by 5%. Moreover, the lightweight design of the bed is achieved with enhanced performance to show the effectiveness of the proposed method.

关键词： Light?weight design Part structure Topology optimization Size optimization Force Performance

Optimization of Uncertain Structures with Interval Parameters Considering Objective and Feasibility Robustness

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2018年第2期31卷 124-136页

作者： Jin Cheng Zhen-Yu Liu jian-rong tan Yang-Yan Zhang Ming-Yang tang Gui-Fang Duan State Key Laboratory of Fluid Power&Mechatronic Systems Zhejiang University State Key Laboratory of CAD&CG Zhejiang University Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education Harbin Institute of Technology

For the purpose of improving the mechanical performance indices of uncertain structures with interval parameters and ensure their robustness when fluctuating under interval parameters, a constrained interval robust optimization model is constructed with both the center and halfwidth of the most important mechanical performance index described as objective functions and the other requirements on the mechanical performance indices described as constraint functions. To locate the optimal solution of objective and feasibility robustness, a new concept of interval violation vector and its calculation formulae corresponding to different constraint functions are proposed. The math?ematical formulae for calculating the feasibility and objective robustness indices and the robustness?based preferential guidelines are proposed for directly ranking various design vectors, which is realized by an algorithm integrating Kriging and nested genetic algorithm. The validity of the proposed method and its superiority to present interval optimization approaches are demonstrated by a numerical example. The robust optimization of the upper beam in a high?speed press with interval material properties demonstrated the applicability and effectiveness of the proposed method in engineering.

关键词： Robust optimization Uncertain structure Interval violation vector Feasibility robustness Objective robustness Nested genetic algorithm

A knowledge push technology based on applicable probability matching and multidimensional context driving

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2018年第2期19卷 235-245页

作者： Shu-you ZHANG Ye GU Xiao-jian LIU jian-rong tan State Key Laboratory of Fluid Power & Mechatronic Systems Zhejiang University

Actively pushing design knowledge to designers in the design process, what we call ‘knowledge push＇, can help improve the efficiency and quality of intelligent product design. A knowledge push technology usually includes matching of related knowledge and proper pushing of matching results. Existing approaches on knowledge matching commonly have a lack of intelligence. Also, the pushing of matching results is less personalized. In this paper, we propose a knowledge push technology based on applicable probability matching and multidimensional context driving. By building a training sample set, including knowledge description vectors, case feature vectors, and the mapping Boolean matrix, two probability values, application and non-application, were calculated via a Bayesian theorem to describe the matching degree between knowledge and content. The push results were defined by the comparison between two probability values. The hierarchical design content models were built to filter the knowledge in push results. The rules of personalized knowledge push were sorted by multidimensional contexts, which include design knowledge, design context, design content, and the designer. A knowledge push system based on intellectualized design of CNC machine tools was used to confirm the feasibility of the proposed technology in engineering applications.

关键词： Product design Knowledge push Applicable probability matching Multidimensional context Personalization

在线全文

学校读者我要写书评

暂无评论

复杂机械产品多准则预防性维护设计(英文)

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第11期15卷 862-872页

作者： Yi-cong GAO Yi-xiong FENG jian-rong tan State Key Lab of Fluid Power Transmission and Control Zhejiang University

研究目的:为复杂机械产品提供满足整机可靠性指标和维护成本指标的预防性维护方案多准则规划方法。创新要点:1.分析了检查、维修、更换等对复杂机械产品零部件工作寿命变化的作用机理;2.提出了复杂机械产品预防性维护多准则规划方法。... 详细信息

研究目的:为复杂机械产品提供满足整机可靠性指标和维护成本指标的预防性维护方案多准则规划方法。创新要点:1.分析了检查、维修、更换等对复杂机械产品零部件工作寿命变化的作用机理;2.提出了复杂机械产品预防性维护多准则规划方法。研究方法:1.基于非完美维修理论,建立不同模式下零件间工作寿命模型,定义维修效能因子,表征检查、维修、更换对零件寿命的影响;2.通过求解获得复杂机械产品指定时间区间的预防性维护方案,根据零部件工作寿命,采取维修和更换等预防性维护措施,减少零部件故障的发生。重要结论:零部件的预防性维护次数与其故障因子相关;机械产品尤其是复杂机械产品实施定期预防性维护能够减少或消除故障的发生。

关键词：预防性维护多准则优化工作寿命

考虑结构柔性的多激励机构关联性能强化设计方法（英文）

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第11期16卷 864-873页

作者： Jing-hua XU Shu-you ZHANG jian-rong tan Zhen ZHAO The State Key Laboratory of Fluid Power Transmission and Control Zhejiang University

目的:揭示多场耦合环境下的多自由度系统中柔性结构对机构性能的影响规律,以低压断路器多激励操动机构为例,研究机-电-热-磁耦合的多模态分断性能强化设计方法,提高短路、过载、欠压、缺相和漏电时的瞬时、短延时和长延时分断性能。创新... 详细信息

目的:揭示多场耦合环境下的多自由度系统中柔性结构对机构性能的影响规律,以低压断路器多激励操动机构为例,研究机-电-热-磁耦合的多模态分断性能强化设计方法,提高短路、过载、欠压、缺相和漏电时的瞬时、短延时和长延时分断性能。创新点:1.将多自由度刚柔耦合系统的物理坐标转换为模态坐标,实现模型降阶和关联性能解耦;2.运用类比法获得零部件对关联性能的影响度,通过实验设计将难测属性转化为关联易测量,实现机构的关联性能强化。方法:1.将多自由度的含柔体动力学系统转化为自由度乘模态阶的方阵,通过Craig-Bampton逐层降阶模态矩阵,并由迭代步反馈激活柔体的高阶模态;2.通过类比求解霍尔姆力、洛伦兹力、电动斥力、电磁力和悬臂双金属片激励力,获得多激励系统机构关节的性能关联程度;3.通过低压断路器电气实验和温升实验,验证零件结构柔性对机构的性能影响规律,实现多激励机构多模态分断性能强化设计。结论:1.提出的考虑结构柔性的多激励机构关联性能强化设计方法有助于提高多自由度动力学系统的瞬态性能;2.结构柔性降低分断性能,使高频分断中的峰值段性能退化;3.基于实验设计的电气实验和温升实验,验证了多激励机构关联性能强化方法的有效性。

关键词：多激励机构机-电-热-磁耦合多体刚柔耦合动力学系统低压断路器关联性能强化

含区间参数的不确定性结构直接可靠性设计优化（英文）

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2016年第11期17卷 841-854页

作者： Jin CHENG Ming-yang tanG Zhen-yu LIU jian-rong tan State Key Laboratory of Fluid Power & Mechatronic Systems Zhejiang University

目的:为提高含区间参数不确定性结构的可靠性,提供一种基于区间模型的不确定性结构的高效可靠性设计优化方法。创新点:1.提出结构性能指标区间可靠度的统一计算公式;2.提出区间可靠度违反度的概念和基于区间可靠度违反度的优于关系准则... 详细信息

目的:为提高含区间参数不确定性结构的可靠性,提供一种基于区间模型的不确定性结构的高效可靠性设计优化方法。创新点:1.提出结构性能指标区间可靠度的统一计算公式;2.提出区间可靠度违反度的概念和基于区间可靠度违反度的优于关系准则;3.提出并实现区间可靠性优化模型的高效直接智能求解算法。方法:1.借鉴图表法并克服其局限,给出计算区间可靠度的统一公式(公式2);2.利用Kriging近似模型和内层遗传算法计算结构性能指标在不确定性参数影响下的变化区间,从而计算出区间可靠性优化模型中各结构性能指标的区间可靠度及其违反度;3.基于区间可靠度违反度的优于关系准则,通过外层遗传算法实现各结构设计矢量的直接优劣排序和区间可靠性优化模型的直接智能求解;4.通过典型算例(图3和4、表2)和工程应用实例(图8和9、表7)验证所提方法的有效性和相比间接求解方法的优越性。结论:1.考虑结构性能指标可靠性要求的不确定性结构区间可靠性设计优化模型能够有效反映实际工程中提高不确定结构可靠性的需求;2.引入区间可靠度违反度的概念和基于可靠度违反度的优于关系准则,利用嵌套遗传算法和Kriging近似模型可实现不确定性结构区间可靠性优化模型的直接高效智能求解;3.提出的区间可靠性优化模型直接求解方法能比间接方法获得更优的解。

关键词：可靠性设计优化不确定性结构区间可靠性违反度优于关系准则直接区间优化嵌套遗传算法