共查询到18条相似文献,搜索用时 869 毫秒
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介绍了用MTS810-100kN电液伺服材料试验机进行橡胶或塑料制品、构件等静动刚度测试时可选用的几个应用软件的特点,在此基础上,依据一定的测试条件,完成了一组轨道用隔振器的静动刚度测试,并分析了试验系统变形对隔振器静、动刚度测试结果的影响。结果表明,在试验数据的处理中应该扣除试验系统的相对变形。 相似文献
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作为弹性敏感元件的波纹管,目前巳在很多技术领域中得到了广泛的应用.本文是作者38年来对波纹管刚度及其测试技术研究成果和实践经验的总结.对弹簧式刚度仪、平衡指示式刚度仪、刚度分选仪、微变刚度谐振测量仪、高精度刚度仪和波纹管性能通用测量仪等进行了重点的阐述。 相似文献
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本文根据电涡流比拟理论测试带键槽轴抗扭刚度和花键轴抗扭刚度的测试结果,分析比较了目前工程界沿用的几个 J_n 计算公式和实际应用精度,提出了它们抗扭刚度的经验公式,其精度在不超过实测值的5%范围内。 相似文献
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橡塑制品动、静刚度及结构回弹性能测试方法与技术 总被引:1,自引:1,他引:0
张亚军 《理化检验(物理分册)》2003,39(6):298-300,311
利用全数字化控制的MTS810液压伺服材料疲劳试验机,对橡胶、塑料等粘弹材料制品的动态刚度、静态刚度及结构回弹性能的测试方法与技术进行了探索和分析。在此基础上,提出了一套较为详细的测试方法;用该方法测试制品的动、静态刚度值,绘制出制品的结构回弹性能曲线,满足了试验委托者的要求。为在MTS810试验机上对该类制品上述性能的测试提供了有益的参考。 相似文献
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Yung‐Hsiang Chen Yen‐Hui Huang 《International journal for numerical methods in engineering》2000,48(1):1-18
The dynamic stiffness matrix of an infinite Timoshenko beam on viscoelastic foundation in the moving co‐ordinate system travelling at a constant velocity is established in this paper. The dynamic stiffness matrix is essentially a function of the velocity of a moving load applied to the beam system. This dynamic stiffness matrix could also be applied to the static‐load case by simply setting the velocity equal to zero. The stiffness matrix for the static case can also be derived from the general formula of the dynamic stiffness matrix for a finite Timoshenko beam on viscoelastic foundation. A European railway subjected to a moving load is employed as an example for demonstration and discussion. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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长方体形空气弹簧刚度计算 总被引:8,自引:0,他引:8
空气弹簧的静、动态刚度及阻尼特性可随要求而改变,特别是它的刚度非线性,可自动避开共振,从而有效地抑制共振振幅。本文就长方体形空气弹簧的刚度特性展开研究,根据气囊体几何形状的改变情况,推导出了计算刚度的表达式。 相似文献
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新型低频隔振器的特性研究 总被引:3,自引:3,他引:0
通过并联具有负刚度特性的刀口支撑滑动梁和正刚度的线性弹簧,设计了全新型的超低频非线性隔振系统。分析了系统的静态力学特性,给出了系统的力-位移关系以及刚度曲线,系统的非线性特性明显。求取了系统具有近似动态零刚度时的参数配置并结合实际应用选定了系统工作平衡点。建立了系统的非线性动力学方程,在对方程进行简化后,采用谐波平衡法求解了Helmholtz-Duffing方程的响应,分析了系统的频响特性,得出了在激励幅值较小的激励下系统具有渐软特性,而激励幅值增大后系统会出现二次跳变,即先表现为软特性后表现为硬特性。对此种新型隔振器的设计提供了理论指导。 相似文献
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目的 为避免果蔬在运输过程中因振动造成损伤,导致价值下降,基于准零刚度隔振技术,提出一种采用紧凑、高效的弹簧–滚轮–滚珠负刚度机构的新型果蔬运输隔振箱装置。方法 首先,基于弹簧–滚轮–滚珠负刚度机构与垂向正刚度弹簧并联的方式设计准零刚度果蔬运输隔振系统结构;其次,分析其静力学特性,推导该非线性隔振装置的刚度特性;最后,在果蔬运输系统模型运动微分方程基础上建立Simulink仿真模型,研究在C级路面激励下,该新型运输隔振系统的动态隔振特性。结果 研究结果表明,通过合理的结构参数设计,该隔振装置在平衡点附近将具有高静态刚度、低动态刚度的准零刚度特性。在C级路面激励下,该新型运输隔振系统的振动位移峰的峰值相较于对应线性系统的衰减约29.3%,加速度均方根值衰减约97.3%。结论 设计合理的新型果蔬运输系统的隔振效率优于对应的线性隔振系统的。 相似文献
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This paper summarizes the results of a preliminary study of the relationship between pallet design and the resonant response of pallet decks to sinusoidal vibration. Sine sweep frequency vibration tests between 3 Hz and 50 Hz were conducted to determine the effect of pallet deckboard stiffness, joint stiffness and the static load level on the resonant response of pallet decks. As the stiffness of the pallet joints and deckboards increases, the resonant frequency of the unit load increases and transmissibility decreases. As the static load on the pallet increases the resonant frequency of the unit load decreases and the transmissibility increases. The survivability of a unitized product, sensitive to vibration, during shipping and distribution is affected by the pallet design. Pallets designed using rigid connections and stiffer decks will reduce damage to vibration‐sensitive products. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
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In this paper, sandwich structures for micro-EDM machines are optimized by using parametric study varying composite geometries and parameters like stacking sequence, thickness and rib geometry. The structures are composed of fibre reinforced composites for skin material and resin concrete and PVC foam (Closed cell, Divinycell) for core materials. Column structure was designed by a beam with cruciform rib and performance indices such as static bending stiffness (EI) and specific bending stiffness (EI/ρ) for dynamic stability are examined by controlling the thickness and stacking sequence of composites. For the machine tool bed, which usually has a plate shape, was designed to have high stiffness in two directions at the same time controlling stacking sequence and rib geometry; that is, rib thickness and number of ribs. The sensitivity of design parameters like rib thickness and composite skin thickness was examined and the optimal condition for high stiffness structure was suggested. Finite element analysis was also performed to verify the static and dynamic robustness of the machine structure. L-shaped joint for combining bed and column of the micro-EDM machine was proposed and fabricated using adhesive bonding. The dynamic performance such as damping characteristics was investigated by vibration tests. From the results optimal configuration and materials for high precision micro-EDM machines are proposed. 相似文献