機械外文翻譯---材料制備機械設(shè)計理論中的新趨勢和新問題-機械設(shè)計-全文預(yù)覽
【正文】 rong nonhertz contact and non linear friction will be produced ,thus local permanent deformation and degrading of element accuracy may be led. New theory foundation of design of machine with super strength pressure field will be furnished through study of multi body strong non hertz contact mechanism , multi body non linear friction mechanism (such as providing force displacement mixed solving process of three dimension multi body) . 3. 4 Load Distribution Law in Multi Sliding Pair With Structure Bias Load With regard to statically indeterminate structure ,load distribution of constraint point is determined by deformation patibility condition. However ,concerning some plane large size statically indeterminate structure with sliding degree of freedom in third dimension ,load distribution can not be determined by deformation patibility condition. Thus new theory basis will be provided by analyzing of contact behaviour and mechanism of sliding pair (such as creep ,force of friction ,integral deformation patibility condition ,etc) . 3. 5 Coupling Mechanism and Stability of Multi Physical Fields in Material Processing Systems In the wake of system function being more and more diversified , conventional technology limits in material processing machine is being broke through unceasingly ,system structure also bees increasingly plicated ,and system performance bees increasingly multi causal . For example ,any instantaneous state of roller in fast rolling mills is affected by elastic deformation ,plastic flow ,heat transfer process , hydro dynamic lubrication process ,interface physical chemistry molecular state and so on . In addition ,electromechanical coupling in processing system have already gone beyond conventional concept ,for instance ,some singular point phenomenon (such as micro variable can be transformed into macro variable) ,are present ,thus roller operation instability may be led by perturbation[8 ] . Therefore ,this subject will study the interaction mechanism of multi physical field and the influence on processing system stability and processing material quality started with analysis of micro state of executive body. 6 3. 6 Multi Technology Integration and Coalescence of Accurate Control The material processing machine ,which operate under the circumstance of extraordinary physical field ,is a plicated large scale system ,and some parameters of the system vary on feasible field boundary 。 procession machine 。 1 New Trends and Problems in Material Processing Machine Design Theory WANG Ailun ,DUAN Jian ,HUANG Minghui ,ZHONG Jue (College of Mechanical amp。 extraordinary physical field。 s 1 , line wave and pulse plex exerted in solidifying deforming area , super strength contact stress field of material forming interface ,turbulent flow field of molten metal with very big flakiness ratio ,low frequency magic field with random frequency ,microwave field for powder metal heating ,ultrasonic field for large volume solidifying ,etc. [4 ] ,are applied. (2) To have the ability to work in critical state so that high stability and ideal performance of processing machine is ensured under the circumstance of reinforced technological condition and multi field coupling operation. For example ,chatter suppressing capability of fast ultra thin rolling under the condition of boun
教學課件相關(guān)推薦
鄂ICP備17016276號-1