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国家自然科学基金(59825117)

作品数:5 被引量:76H指数:3
相关作者:曾攀雷丽萍陈海平方刚刘建新更多>>
相关机构:清华大学更多>>
发文基金:国家自然科学基金更多>>
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螺纹副承载的分布规律被引量:69
2010年
介绍螺纹副载荷分布特点以及螺纹副承载分布的解析方法、光弹试验方法和有限元法。基于ANSYS平台建立参数化的螺纹副承载分布有限元模型,通过SOPWITH和YAMATOTO两种解析方法验证螺母轴力计算结果,将各扣螺纹牙承载比例与光弹冻结试验结果进行对比,以验证有限元模型的可靠性。接着系统考察螺纹类型、螺距P、螺纹副径向尺寸系数d/D、啮合扣数N、摩擦因数μ和螺纹副材料弹性模量比Eb/En等因素对螺纹副承载分布的影响,并对主要影响因素进行回归分析。
陈海平曾攀方刚雷丽萍
关键词:螺纹副ANSYS有限元分析
Local equivalent welding element to predict the welding deformations of plate-type structures被引量:1
2008年
Considering the Heat Affected Zone (HAZ) of welding joint, the residual strain be-haviors of material under constraint and temperature circulation, as well as the activating mechanism of welding process, this paper addresses a new type welding element for numerical simulation of welding deformation, which is called the LEWE (the local equivalent welding element). This element can describe the basic char-acteristics of welded seam: the local position points of inherent strain, the equiva-lent size, the bending radius (or bending angle) from inherent strain, etc. It could be used to predict the welding deformation of plate-type structure. The comparisons between the computed deflection of welded plate and its experiment measurement are present. The results showed that the LEWE possesses a potential to simulate the deformation of welding process high-efficiently and precisely.
ZENG PanGAO YiLEI LiPing
关键词:WELDINGLOCALWELDINGELEMENT
变温环境下精密调谐机构频率补偿原理的有限元分析被引量:3
2006年
对精密调谐机构进行了精细的有限元建模,采用等效建模方法对机构的连接弹簧、调谐螺钉、配合关系进行了处理,就精密调谐机构在0^+65℃的变温环境下进行了计算,分析了调谐机构在高温环境下的频率补偿原理.实际的测试结果表明了计算分析的正确性.
刘建新曾攀
关键词:滤波器频率补偿有限元分析
用于板材焊接变形预测的原位等效焊接单元
2008年
基于焊接接头热影响区以及其材料在拘束条件下热循环残余变形的行为,再引入焊接过程的激活机制,构建用于板材焊接变形预测的原位等效焊接单元,该单元具有焊缝的固有应变原位点、等效尺度、固有变形的弯曲半径(或角度)等特征参数,可以较准确地预测板材焊接过程中的变形;引用已有的薄板对焊变形的试验结果与采用原位等效焊接单元的计算进行验证,取得很好的结果,算例表明:原位等效焊接单元对于焊接结构的变形计算具有效率高、精度好等特点.
曾攀高懿雷丽萍
关键词:特征参数焊缝
NUMERICAL ANALYSES OF DESIGN AND ASSEMBLY FOR MAIN COMPONENTS OF BESIII
<正>The main drift chamber and the electro-magnetic calorimeter are most importance sub-detectors in BESⅢ(Beiji...
Zeng Pan
关键词:FEMPRE-STRESS
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NUMERICAL ANALYSES OF DESIGN AND ASSEMBLY FOR MAIN COMPONENTS OF BESIII被引量:3
2007年
The design and manufacture of the main drift chamber(MDC) and the electro-magnetic calorimeter are most important issues in Beijing electron-positron collider upgraded projects. The whole mass of electro-magnetic calorimeter (EMC) in BESIII is 40 t, thus high stiffness, strength and dynamical properties are required for the design of entire structural of electro-magnetic calorimeter. Based on numerical technique, the strength and the dynamical properties of EMC are analyzed, which provide theoretical reference for the design of entire structural of EMC. The MDC is composed of the elements with 28 680 pre-stressed high-sensitive wires and during the assembly the wires are stringed layer by layer. The stretching forces of the wires vary continuously and couple with each other in the whole process. The modeling technique with high precision (especially "element birth and death") is carefully used to study the stress state during the process of assembly. So the variations of the stretching force of the wire are investigated, and several design schemes are evaluated and optimized. The research results have been adopted in the Beijing electron-positron collider's new project directly.
ZENG PanLEI LipingZHAO RuihaiLI YingCHEN YuanboTANG Xiao
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