共查询到19条相似文献,搜索用时 109 毫秒
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作为一种新的设计,CAP1400堆内测量格架组件的流致振动需要进行试验验证。研究过程中,分析了堆内测量格架组件的振动特性,通过湍流随机振动分析发现堆测导管响应最大,在此基础上分析各阶模态对堆内测量格架组件流致振动的贡献,提取出其主要模态,作为试验件模型优化的依据。随后共提出了四种简化模型,通过对比简化模型和实际结构的模态频率和振动响应,确认了简化模型的合理性;综合考虑经济型和准确性,选择了一种最优的简化模型,为CAP1400堆内测量格架组件流致振动试验件的设计提供支持。 相似文献
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工程领域一直都缺少对紧固件防松性能进行定量评价的方法,针对该问题,基于现有的横向振动试验方法,改进了横向振动试验设备,提出以导致旋转松动的临界横向力作为评价防松性能的定量指标,并给出了具体的试验方法和数据获取方法.基于所提的方法,对弹簧垫圈、楔形螺母和偏心双螺母的防松性能进行了定量测试与对比,在本研究试验条件下,得出以下结论:①弹簧垫圈没有防松性能;②相同预紧力下,相比普通螺纹连接,使用楔形螺母后防松性能最多提升了117%;③相同预紧力下,相比普通螺纹连接,使用偏心双螺母后防松性能最多提升了125%;④在高预紧力条件下,使用楔形螺母和偏心双螺母后防松性能和普通螺纹连接的防松性能相差不大. 相似文献
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Raja Ariffin Raja Ghazilla Zahari Taha Sumiani Yusoff Salwa Hanim Abdul Rashid Novita Sakundarini 《The International Journal of Advanced Manufacturing Technology》2014,70(5-8):1403-1413
Among the important strategies in sustainable product development is by maintaining product recovery and prolonging product life which are highly dependent on the ease of disassembly. When considering the design for disassembly, there are many fastener-associated factors to be considered such as structural, disassembly process and the pre-disassembly process. There are very few designs for disassembly methods that support the selection of fasteners for design for disassembly (DfD) concepts. Most of the tools developed are more applicable during later stages of the design process when more product information is available. The process of selecting a fastener for its functional characteristics itself is often vague. Additionally, the requirements for disassemblability further complicate the process. This paper proposes the development of a multi-criteria decision making model to assist designers in selecting fasteners for DfD. PROMETHEE was used to build a decision-making model to help the designers in selecting the fasteners that could perform their intended functions with ease of disassembly. A design case study is described to reflect the usefulness of the fasteners selection model. 相似文献
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《Measurement》2014
This paper presents sensoric fasteners which are produced by metal forming. Sensoric fasteners enable the monitoring of pretensioning forces and operating loads in mechanical connections between components. For the gathering of combined force and torque sensor signals in individual spatial directions the sensor unit has to provide the capability to transmit loads in all directions of space. The elementary sensors are integrated into the metallic fasteners structure during manufacture. This results in an assembly of supporting structure and sensor which shows a highly reproductive and sensitive interaction between its mechanical and electrical properties. In order to evaluate this interaction calibration measurements are carried out.With the help of examinations of both stationary and transient running manufacturing processes it can be shown, that the new fasteners provide the mechanical connection between tools and machine as well as the possibility to monitor operating loads. The latter allows monitoring and analysis of process forces acting within the mechanical connections. 相似文献
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Hong Heerok Lee Hoyong Jeong Naktak Baek Keonhee Suh Myungwon 《Journal of Mechanical Science and Technology》2020,34(3):1195-1205
Journal of Mechanical Science and Technology - The threaded fasteners are typical machine components in tightening of the machine parts and structures. In addition, as threaded fasteners are easy... 相似文献
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基于车辆轨道耦合动力学模型和钢轨材料摩擦磨损计算模型,分析了不同轨道结构参数和车辆运营速度对地铁直线轨道钢轨波磨发生和发展的影响。结果发现,对于不同的变量参数,轮轨接触斑内摩擦功率随时间的变化都具有一定的波动性,且摩擦功率整体波动幅度较为均匀。同时,摩擦功率1/3倍频程图分析结果表明,摩擦功率的特征频率主要集中在中低频范围。在主要特征频率处,扣件纵向刚度、纵向阻尼、横向阻尼和垂向阻尼对钢轨波磨的影响较小,扣件横向刚度、垂向刚度、扣件间距、轮轨摩擦因数和车辆运行速度对钢轨波磨的影响较大。扣件垂向刚度和扣件间距的变化会导致摩擦功率的特征频率发生偏移,主要特征频率从80 Hz偏移至100 Hz,从而导致对应波长的钢轨波磨,说明扣件垂向刚度和扣件间距对特定频率处钢轨波磨的产生和发展具有重要的影响。其余变量的增大并未导致摩擦功率的特征频率发生改变,表明其余变量不影响钢轨波磨的特征频率。 相似文献
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汽车紧固件作为串联汽车关键零部件的基础件,其质量的好坏对整车性能和安全性有着直接的影响.文中根据紧固件在装车前、装车时和装车使用后常见问题的统计分析结果,对紧固件故障类型和原因进行了分类.重点讨论了紧固件因混料问题、疲劳断裂、热处理问题、表面处理问题及过载断裂而产生的失效模式,并结合几种典型失效案例,详细分析了这些问题... 相似文献