液压支架的静力分析和模态分析外文文献翻译

英文原文The Structure Statics Analysis and Transient Dynamics Analysis of Hydraulic SupportHongyu LiuSchool of Mechanical Engineering and AutomationUniversity of Science and Technology LiaoningAnshan, Liaoning, Chinalhy_04126.comAbstractHydraulic support is a key equipment of synthesis mechanization caving coal and safe production in modernization coal mine. This paper took ZT6500/19.5/34 hydraulic support as an example. According to national standard, structure statics analysis and transient dynamics analysis of the type hydraulic support strength test were preceded under base torsion working condition by ANSYS software. The relevant total displacement distribution rule and equivalent stress distribution rule of the type hydraulic support prototype were found. The relevant change rules of equivalent stress, equivalent strain, remain stress and remains strain along with time were analyzed. This provides an effective research way on enhancing strength and load bearing capability of hydraulic support.Keywords-hydraulic support; structure statics analysis; transient dynamics analysis; residue stress; residue strainI.INTRODUCTIONHydraulic support is a key equipment of synthesis mechanization caving coal. Now, lots of countries in the world are increasing investment on hydraulic support design, manufacture and research. A new type of hydraulic support must pass hydraulic support prototype type test in special institution appointed by nation and acquire technology authentication eligibility report before it use in China 1. The structure statics analysis and transient dynamics analysis of hydraulic support were proceeded by ANSYS finite element analysis software. This method can find out the total displacement and the equivalent stress distribution rule of hydraulic support. The characteristic of equivalent stress, equivalent strain, residual stress and residual strain changed with time can also be analyzed.II.THE STRUCTURE STATICS ANALYSIS OF HYDRAULIC SUPPORTA. Three Dimensions Solid Model ConstructionThree dimensions design software SolidWorks has good three dimensions construction model function. So, this paper constructs the three dimensions solid model of ZT6500/19.5/34 hydraulic support. Relevant hydraulic support prototype is shown in Fig.1. During model construction, some unimportant parts were simplified, which can not affect strength analysis results. Thiskind of simplification does accord with engineering practice. Relevant simplified hydraulic support prototype with test height 2850 mm is shown in Fig.2Fig.1 ZT6500/19.5/34 hydraulic support prototypeFig.2 Simplified hydraulic support prototypeB.Structure Simplification, Solid Model Led in, GridDivision Restriction and LoadHydraulic support three dimensions solid model constructed by SolidWorks was saved as .sat file format. It can be led in ANSYS without any data loss. This method can decrease more time than direct construction model in ANSYS. Relevant solid model were divided with grid pattern by solid element solid92 and freedom division grid method 2. Hydraulic support prototype was divided into 56,884 elements and 109,445 nodes with test height 2850 mm. It is shown in fig.3. Fig.3 Hydraulic support prototype grid division figureIn hydraulic support strength test, the method of laying block on different hydraulic support place was adopted usually to simulate different load bearing working condition under well. The force produced by block to hydraulic support was treated as restriction condition commonly in finite element analysis 1. A rigidity long block and a square block were placed on two sides of base motherboard under base torsion working condition . So, the top beam top board contacts with test board. Simultaneity, the load was exerted on top beam and base by four pillars. According to the prescript of MT312-2000 General Specification for Powered Support, the load exertion pattern of hydraulic support strength test is inside load exertion pattern 3. So, the loads were exerted on top beam and base by four pillars, whose value were 1.2 times of working resistance of hydraulic support prototype, which was 7800 KN.Fig.4 The restriction and load status under base torsion working condition All kinds of load working conditions of hydraulic support strength test were listed in MT312-2000 General Specification for Powered Support. For the base torsion working condition was the worst among these working conditions, so, this paper mainly makes an entire finite element analysis on hydraulic support prototype under this load working condition. After grid division, relevant restriction and load status are shown in Fig.4. C. Computation Result and Analysis By the entire finite element analysis on hydraulic support prototype under the base torsion load working condition with ANSYS software, relevant total displacement and equivalent stress distribution rules can be found. Relevant total displacement distribution figures and equivalent stress distribution figures are shown in fig.5 and fig.6 respectively. Relevant displacement unit was millimeter. Relevant equivalent stress unit was Pa. Relevant test height was 2850 mm. Fig.5 Total displacement distribution figure of hydraulic support prototypeThe total displacement distribution rule of hydraulic support prototype is shown in Fig.5. The displacement of hydraulic support prototype base, front link and back link are big. While, the displacement of bevel beam and top beam are small correspondingly. The maximum value lies on the front starboard of base, whose value is 2.607 mm. So, hydraulic support prototype material can satisfy the use demand.The equivalent stress distribution rule of hydraulic support prototype is shown in Fig.6. The stress value on the join pin between hydraulic support prototype base and back link is maximum, whose value is 480 MPa that less than the yield strength 785 MPa of join pin material. It means that join pin can satisfy the use demand. But relatively big stress concentration was produced on the transition round arc of hydraulic support prototype base Fig.6 Equivalent stress distribution figure of hydraulic support prototypeconnecter bridge inside. Relevant stress value on node 41540 is up to 328 MPa, which is between proportional limit stress 270 MPa and yield strength 340 MPa. So, hydraulic support prototype material can still satisfy the use demand.III. THE TRANSIENT DYNAMICS ANALYSIS OF HYDRAULIC SUPPORTTransient dynamics analysis is also named as time history analysis. This kind of method can confirm structure dynamics respond under discretional load changed with time. The transientdynamics analysis usually need use more computer resource and manpower computed from engineering time. So, the transient dynamics analysis is more complex than the structure staticsanalysis. Three methods can be adopted in transient dynamics analysis.They are full method ,reduce method and mode superposition method 2. After comparing the advantage and defect of above three methods, this paper adopted full method to proceed transient dynamics analysis on hydraulic support.Adopted full method to proceed transient dynamics analysis on hydraulic support help user to further find out the characteristic of equivalent stress and equivalent strain changed with time produced from hydraulic support strength test load course. This paper took the type hydraulic support under base torsion load working condition with test height. Hydraulic support strength test load course is shown in Fig.7. The equivalent stress curve changed with time of hydraulic support on node 41540 is shown in Fig.8. The equivalent strain curve changed with time of hydraulic support on node 41540 is shown in Fig.9. Relevant equivalent stress unit is 105 Pa. Relevantequivalent strain unit is 10-3 İ. Relevant time unit was second. In Fig.7, Pe is test pressure, whose value is 39.72 MPa that is 1.2 times normal working pressure 33.1 MPa. Pc is feed liquid pressure, whose value is 31.5 MPa. t1 is original load period. t2 is increase pressure period. t3 is steady pressure period. t4 is uninstall period. T is one load period. t1 , t2 and t4 are all ten seconds. t3 is five minutes.Fig.7 Load course curve of hydraulic support strength testFig.8 Equivalent stress curve of node 41540 changed with timeFig.9 Equivalent strain curve of node 41540 changed with timeFig.8 and fig.9 show that when the load press is up to maximum 7800 KN that is 1.2 times hydraulic support work resistance 6500 KN the stress produced on node 41540 is 328 MPa, which is between proportional limit stress 270 MPa and yield strength 340 MPa. Then, after first complete uninstall, a little residual stress 37.2 MPa and residual strain 186 İ was produced. After repeated load, hydraulic support material will not produce the accumulation on residual stress and residual strain, as long as repeated load press is not bigger than the maximum press value at uninstall. It extends the elasticity work area of hydraulic support material. The proportional limit stress was heightened to the maximum stress value produced by maximum uninstall press virtually. So, hydraulic support load capability and strength were enhanced greatly.IV. CONCLUSIONThe structure statics analysis of ZT6500/19.5/34 hydraulic support strength test under base torsion load working condition by ANSYS software was proceeded. User can know the total displacement distribution rule and equivalent stress distribution rule of hydraulic support. Transient dynamics analysis of ZT6500/19.5/34 hydraulic support strength test under base torsion load working condition was proceeded. User can know the rule of equivalent stress and equivalent strain changed withtime produced from hydraulic support strength test load course.Structure statics analysis and transient dynamics analysis provide effective ways on design and research hydraulic support.REFERENCES1 Guofa Wang, Hydraulic support technology, Coal Industry PublishingHouse, Beijing, 1999 (In Chinese).2 Jin Duan, Dong Ni and Guoye Wang, ANSYS 10.0 structure analysis fromaccidence to mastery, Weapon Industry Publishing House, Beijing 2006 (InChinese).3 Peoples republic of China coal industry standard MT312-2000 generalspecification for powered support, Coal Industry Publishing House, Beijing,2001 (In Chinese). 中文译文液压支架的静力分析和模态分析摘要：液压支架是综采设备和现代化安全生产的重要组成部分。本文以ZT6500/19.5/34液压支架为例。根据国标，采用ansys软件对之前底座扭转工作条件下液压支架强度试验的结构进行静力分析和瞬态分析。得到液压支架相关的位移分布云图和等效应力分布云图，对等效应力、等效应变、残余应力和残余应变随时间变化情况进行分析，获得一种能有效提高液压支架强度和承载能力的的方法。关键词：液压支架；结构静力分析；瞬时动态分析；残余应力；残余应变1引言液压支架是综采设备的重要组成部分。目前很多国家都增加了对液压支架设计、制造和研究方面的投资。在中国，一种新型的液压支架的诞生要经过国家特定的模型试验和获得技术合格证明。本文采用ansys有限元软件对液压支架进行静力分析和瞬态分析。这种方法能得到液压支架的计算位移云图和等效应力云图，还能对其等效应力、等效应变、残余应力和残余应变随时间变化情况进行分析。2液压支架的结构静力分析1、三维模型的建立三维模型设计软件有一个好的三维建模功能，本文建立了ZT6500/19.5/34液压支架的三维固体模型，具体见图1.模型建立过程中，把一些不影响强度分析结构的非关键部件根据工程实际进行了适当的简化，简化后液压支架高2850mm，具体见图2.图1 ZT6500/19.5/34液压支架图图2 液压支架简化模型2、结构简化、固体模型导入、网格划分、加约束和加载液压支架三维固体模型建立被保存在.sat file format文件下，它能完全导入ansys中，这种方法建模比在ansys中直接建模更节省时间，采用固体单元solid92和自由划分的方式对固体模型进行划分网格，高2850mm的液压支架共被划分成56884个单元和109445个节点，具体见图3。图3 液压支架网格划分图液压支架强度试验，基准块方法通常被用于不同地方液压支架的不同承载条件。在有限元分析中，通常把基准块对液压支架产生的力换算成约束条件，一刚性块和一个正方形的块被放在基础工作条件1下扭转主板的两边，所以，顶梁与测试板相连，同时由四个支柱对顶梁施加荷载。根据MT312- 2000对动力支架的一般规定，液压支架负载的消耗模式强度试验是在负载消耗模式里面3。因此，由四个支柱将正常工作条件下的1.2倍抗力施加到顶梁和底座上，其值为7800KN。液压支架强度试验的所有类型的荷载工作条件都被列入MT312- 2000动力支架的详细说明中。其中基底扭转1是最苛刻的工作条件，因此，本文主要对该条件下的液压支架进行全面的分析。网格划分，边界约束和荷载类型见图4。图4 基底扭转条件下的边界约束和荷载形式3、计算结果和分析采用ansys软件对基底扭转条件下的液压支架的有限元进行分析，得出总体位移和等效应力云图，总体位移分布云图见图5，等效应力分布云图见图6，其中位移单位为mm，等效应力单位采用Pa。模型高度2850mm。图5 液压支架计算位移分布图从图5液压支架计算位移分布云图可以看出，