检索结果-南通市图书馆

The Information Integration of CAPP in CIMS

在线全文

cnki会议

学校读者我要写书评

暂无评论

厦门大学学报（自然科学版） 2002年第S1期41卷 182-183页

作者： ZHANG Yu 1, XIONG Man-chen 2 (CIMS Application and Research Center, faculty of mechanical and Electr onic engineering, kunming university of science and technology, kunming 65009 3, China)

This paper analyzes the flow of the process design an d the fountain of the technique data in a manufacturing enterprise, and discusse s the information flows between CAPP and other systems in CIMS, such as CAD syst em and Enterprise Resource Planning (ERP) system. And then, it discusses the pla ns of information integration between CAPP and CAD, as well as between CAPP and ERP. To design the processes of a product requires the manufacture information, such as blank material and machine tool, which is saved in a database in ERP. General ly, a traditional CAPP system considers the information of the manufacturing res ources, such as machine tool, as changeless. However, it is real changing, becau se the resources may be occupied or the machine tool may be under repair. Theref ore, in order to design the processes more reasonably, we must consider the real change of resources in a workshop. Creating a public resource database to suppo rt the real change of resources is put forward in this paper. With the public re source database, the resource integration between CAPP system and ERP is realize d; and by information collections in CAPP system, such as BOM, the material cons umption and man-hour consumption and their output to ERP, the information integ ration between CAPP system and ERP is realized.

关键词： CIMS CAPP ERP information integration techniq ue data

Torque model of hydro turbine with inner energy loss characteristics

在线全文

学校读者我要写书评

暂无评论

science China(Technological sciences) 2010年第10期53卷 2826-2832页

作者： ZENG Yun1,2, GUO YaKun2, ZHANG LiXiang1, XU TianMao3 & DONG HongKui4 1 Construction engineering College, kunming university of science and technology, kunming 650051, China 2 School of engineering, university of Aberdeen, Aberdeen AB24 3UE, UK 3 Computing Center, kunming university of science and technology, kunming 650051, China 4 Hydraulic Energy Department, Yunnan Electric Power Test and Research Institute, kunming 650217, China Construction engineering College Kunming University of Science and Technology School of engineering University of Aberdeen

This paper presents the result and analysis of the composition of energy loss occurring in the hydro turbine. Two new types of energy losses,namely the hydraulic loss in the flow channel and the impact loss,are defined. All losses within the hydro turbine are divided into four types and the loss coefficients are defined accordingly. Expressions or characteristic descriptions of these losses as well as the calibration method of the loss coefficients are presented. Furthermore,the torque model of the hydro turbine where the inner energy loss takes place is established. The developed model has been used to calculate the power loss due to the mechanical friction generated by the units’ rotation to solve the difficulty of measurements of the mechanical friction loss in the hydro turbine. The definition of the impact loss explains the phenomenon that the loss of no-load is greater than that of the rated operation. A set of conversion coefficients are defined using the characteristic parameters at the rated operation,which are used to transform the parameters in the torque model into those that are easily measured. Therefore,the expression of the hydro turbine power is converted into a function that has the main servomotor displacement as its single variable. This makes the proposed model be convenient to use. Finally,the proposed model and methods are calibrated and verified using the measured data of a hydropower plant. Good agreement between the modeled results and the measurements indicates that the proposed model can represent the inner energy loss characteristics of the hydro turbine.

关键词： hydraulic loss in flow channel impact loss loss coefficients conversion coefficients

Preparation of TiC/Ni_3Al Composites by Upward Melt Infiltration

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & technology 2000年第4期16卷 387-392页

作者： Yi PAN (Department of Materials science and engineering, Zhejiang university, Hangzhou 310027, China) Kewei SUN (National engineering Research Center of Solid Waste Resources Recovery, kunming university of science and technology,kunming 650093, China) Department of Materials science and engineering Zhejiang University Hangzhou 310027 China National engineering Research Center of Solid Waste Resources Recovery Kunming University of Science and Technology Kunming 650093 China

TiC/Ni_3Al composites have been prepared using upward infiltration method. The densification was performed by both Ni_3Al melt filling and TiC sintering during the infiltration. The dissolution of TiC in liquid Ni_3Al has been evidenced by finding Ni_3(Al,Ti)C after fast cooling in the TiC/Ni_3Al composites. The dissolution may be responsible for the infiltration and sintering. Compared with downward infiltration, the upward infiltration brought about higher strength and fracture toughness and shorter infiltration time. TiC/20 vol. pct Ni_3Al composite processed by upward infiltration had a flexural strength of 1476 MPa with a statistic Weibull modulus of 20.2 and a fracture toughness of 20.4 MPa . Better mechanical properties may be attributed to melt unidirectional movement in upward infiltration.

关键词： TiC Preparation of TiC/Ni3Al Composites by Upward Melt Infiltration Ni Al

The Inheritance of Minority Art Elements in Chinese Designs

在线全文

学校读者我要写书评

暂无评论

The Inheritance of Minority Art Elements in Chinese Designs

2008 IEEE 9th International Conference on Computer-Aided Industrial Design & Conceptual Design

作者： yanyan Wang~1 Weiping Hu~2 Zhihao Zou~2 1 faculty of mechanical and electrical engineering kunming university of science and technology China 2 faculty of mechanical and electrical engineering kunming university of science and technology China

Being one of Chinese traditional art,the minority art has been distinguished as its unique culture appeal and national *** the gradual evolvement of the decorative patterns,minorit

关键词：

Machine Fault Diagnosis based on Frequency-Domain Blind Deconvolution

在线全文

cnki会议

学校读者我要写书评

暂无评论

Machine Fault Diagnosis based on Frequency-Domain Blind Deco...

2011 International Conference on Modelling,Identification and Control(ICMIC 2011)

作者： Nan Pan is with the faculty of mechanical & electrical engineering,kunming university of science & technology kunming,650093,P.R.China .Xing Wu is with the faculty of mechanical & electrical engineering,kunming university of science & technology kunming,650093,P.R.China .Yilin Chi is with the faculty of mechanical & electrical engineering,kunming university of science & technology kunming,650093,P.R.China .Xiaoqin Liu is with the faculty of mechanical & electrical engineering,kunming university of science & technology kunming,650093,P.R.China .Chang Liu is with the faculty of mechanical & electrical engineering,kunming university of science & technology kunming,650093,P.R.China

On the basis of introducing the model of Frequency-Domain Blind Deconvolution (FDBD),key techniques in mechanical signal extraction were comprehensively related and analyzed in this paper,which include the methods of suppressing the difference between circular and partial convolution by coordinating the relationship between FFT size and length of each frequency bin or Modified Discrete Fourier Transform,the methods of removing the permutation indeterminacy (methods based on consistency of filter coefficients,DOA methods,Split Spectrum methods,methods based on Nonlinear Function,etc.),the applications of Complex-Domain Blind Separation Algorithms which based on explicit tensor eigenvalue decomposition and nonlinear *** at vibration and acoustic signal feature extraction in complex environment and equipment with complex mechanical structures,the application values of FDBD and its research status in machinery condition monitoring and fault diagnosis were reviewed and ***,the main problems which need to be studied further in this area were pointed out.

关键词： domain Domain Machine Fault Diagnosis based on Frequency-Domain Blind Deconvolution

External synchronization of two dynamical systems with uncertain parameters

在线全文

cnki会议

学校读者我要写书评

暂无评论

science China(Technological sciences) 2010年第3期53卷 731-740页

作者： HAN QingKai 1,SUN XiaoYu 2,yang XiaoGuang 3 &WEN BangChun 1 1 School of mechanical engineering&Automation,Northeastern university,Shenyang 110004,China 2 School of electrical engineering,Shenyang university of technology,Shenyang 110023,China 3School of mechanical engineering,The university of Birmingham,Birmingham,B15 2TT,UK School of mechanical engineering & Automation Northeastern University School of electrical engineering Shenyang University of Technology School of mechanical engineering The University of Birmingham

External synchronization is addressed as two or more dynamical systems with synchronous motions,which is also regarded as master-slave *** this paper,two dynamical systems,one employs a hysteretic term to model the friction phenomenon,the other involves a hardening stiffness component with the third order of displacement due to flexible deformation,are controlled to converge to the same *** control strategy is extended from feedback control for all parameters known to adaptive control for linear parameters unknown and all parameters *** slave system can keep synchronous motions with the movements of master via the designed control strategy even all the parameters are not *** stability of synchronization error,the transient process into synchronization and the effects of parameters on the designed controller using different control strategies are *** simulation results unfold the feasibility and effectiveness of this synchronization method.

关键词： controlled synchronization uncertain parameters hysteretic system Duffing system

LPCS Ni-Zn-Al_(2)O_(3) Intermediate Layer Enhanced SPS NiCr-Cr_(3)C_(2) Coating with Higher Corrosion and Wear Resistances

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of technology(Materials science) 2024年第1期39卷 188-195页

作者：白杨 LI yan XING Lukuo LI Xiangbo WANG Zhenhua State Key Laboratory of Marine Coatings Marine Chemical Research Institute Co.Ltd.Qingdao 266071China College of mechanical and electrical engineering University of China Petroleum(East China)Qingdao 266580China science and technology on Marine Corrosion and Protection Laboratory Luoyang Ship Materials Research InstituteQingdao 266101China

The double-layer NiCr-Cr_(3)C_(2)/Ni-Zn-Al_(2)O_(3) coatings with sufficient corrosion and wear resistance were prepared on low carbon steel *** intermediate layers Ni-Zn-Al_(2)O_(3) were fabricated by using low-pressure cold spray (LPCS) method to improve the salt fog corrosion resistance properties of the supersonic plasma spray (SPS) NiCr-Cr_(3)C_(2) *** friction and wear performance for the double-layer and single-layer NiCr-Cr_(3)C_(2) coatings were carried out by line-contact reciprocating sliding,*** with the coating surface analysis techniques,the effect of the salt fog corrosion on the tribological properties of the double-layer coatings was *** results showed that the double-layer coatings exhibited better wear resistance than that of the single-layer coatings,due to the better corrosion resistance of the intermediate layer;the wear mass losses of the double-layer coatings was reduced by 70%than that of the single layer coatings and the wear mechanism of coatings after salt fog corrosion conditions is mainly corrosion wear.

关键词： low-pressure cold spray NiCr-Cr_(3)C_(2)coating wear behavior salt fog corrosion

Optimization Design of the Multi-Layer Cross-Sectional Layout of An Umbilical Based on the GA-GLM

在线全文

学校读者我要写书评

暂无评论

China Ocean engineering 2024年第2期38卷 247-254页

作者： yang Zhi-xun YIN Xu FAN Zhi-rui yan Jun LU Yu-cheng SU Qi MAO yandong WANG Hua-lin Institute of marine machinery College of Mechanical and Electrical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDepartment of Engineering MechanicsDalian University of TechnologyDalian 116024China Ningbo Institube of Dalian university of technology Ningbo 315040China

Marine umbilical is one of the key equipment for subsea oil and gas exploitation,which is usually integrated by a great number of different functional components with *** layout of these components directly affects manufacturing,operation and storage performances of the *** the multi-layer cross-sectional layout design of the umbilical,a quantifiable multi-objective optimization model is established according to the operation and storage *** the manufacturing factors,the multi-layering strategy based on contact point identification is introduced for a great number of functional ***,the GA-GLM global optimization algorithm is proposed combining the genetic algorithm and the generalized multiplier method,and the selection operator of the genetic algorithm is improved based on the steepest descent *** algorithm is used to find the optimal solution in the global space,which can converge from any initial layout to the feasible layout *** feasible layout solution is taken as the initial value of the generalized multiplier method for fast and accurate ***,taking umbilicals with a great number of components as examples,the results show that the cross-sectional performance of the umbilical obtained by optimization algorithm is better and the solution efficiency is ***,the multi-layering strategy is effective and *** design method proposed in this paper can quickly obtain the optimal multi-layer cross-sectional layout,which replaces the manual design,and provides useful reference and guidance for the umbilical industry.

关键词： umbilical cross-sectional layout multi-layers GA-GLM optimization

Study on the Quantitative Model of On-Time Delivery Ratio of Suppliers Based on the Concession Management of Unqualified Products （ID:F-013）

在线全文

学校读者我要写书评

暂无评论

Study on the Quantitative Model of On-Time Delivery Ratio of...

第十四届工业工程与工程管理国际会议

作者： Chen Ting Hou Kaihu faculty of mechanical & electrical engineering kunming university of science & technology kunming P.R.China 650093

＜正＞In order to adapt to the rapidly changing competitive environment,market competition of enterprise has be- come competition of *** and evaluation of suppliers in the supply-chain have become a key problem that enterprise must pay attention to while establishing supply-chain with competitive *** on-time delivery ratio of suppliers is a very important indicator in the selection and evaluation systems of *** can be regarded as a computing method estimating whether cooperative relationship between bilateral partners is smooth or ***, it is calculated according to the ratio between on-time delivery in batches and total batches delivered or the ratio between on-time delivery quantity and total quantity in the ***,the algorithm is too simple to exactly and objectively evaluate the on-time delivery ratio of *** to the characteristics of more complex,more outer materials, big difference of products in discrete manufacturing,this paper synthetically takes the product quality,the delay days and the quantitative contrast of other factors into consideration based on former algorithm,combining with the practice of concession management of unqualified products in enterprise on the basis of the quality characteristics,the degree of im- portance,and the economic value of outer materials often,and finally establishes a quantitative evaluation model of on- time delivery ratio of suppliers based on the concession management of unqualified *** calculating and analy- zing this model,this paper discusses the strategy that enterprise encourage suppliers how to improve their on-time deliv- ery ratio in the environment of supply-chain,analyzes and approves the validity and rationality of the model applied in suppliers performance evaluation with actual case.

关键词： Suppliers Evaluation On-Time Delivery Ratio Concession Management Quantitative Model