共查询到19条相似文献,搜索用时 625 毫秒
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建立了扭杆弹簧的波动方程,提出求解扭杆弹簧传递特性的方法,并推导出弹性波在扭杆弹簧中的传递速度,对沿弹簧传播的位移、速度、应力、应变和作用力的传递特性进行了探讨。分析了扭杆弹簧弹性单波的求解方法及波动干涉问题。推导了弹簧的波阻公式,为扭杆弹簧的波动理论建模及实际应用提供参考。 相似文献
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有效夹紧长度是影响钢板弹簧力学特性的关键,基于UG创建钢板弹簧自由状态的几何模型,考虑夹紧长度的影响,在ABAQUS里面建立钢板弹簧有限元模型,分析不同的夹紧长度下对钢板弹簧力学特性影响。通过3种夹紧长度分析对钢板弹簧的刚度与强度特性进行分析,获得了夹紧长度对应力与刚度的影响规律,结果表明钢板弹簧的最大等效应力随着夹紧长度的增加而增加,但对整个钢板弹簧的最大应力影响并不大,板簧的刚度随夹紧长度的增加而增大,且影响较大。 相似文献
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钢板弹簧是悬架中力学性能比较复杂的构件,既是弹性元件,又是传递纵向、侧向地面作用力的传力元件,因此精确建立钢板弹簧模型是构造车辆多体模型的一大难点。根据钢板弹簧的结构和受载特点,考虑其工作过程中的大变形、片间摩擦迟滞性及非线性接触等因素,在ADAMS中精确建立了钢板弹簧的多柔体动力学模型。利用ADAMS软件对其进行动特性仿真,仿真分析的结果与试验数据对比,验证了模型是正确的。 相似文献
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FU Chaoxing School of Mechanical Engineering Dalian Jiaotong University Dalian China College of Mechanical Electrical Engineering Qingdao University Qingdao China WANG Xiulun School of Mechanical Engineering Dalian Jiaotong University Dalian China WANG Jirong LIU Dawei College of Mechanical Electrical Engineering Qingdao University Qingdao China 《机械工程学报(英文版)》2006,19(4):583-587
The wave transmission character of helical spring is applied to establish 2-DOF model of impacted vehicle on the wave impact theory. Considering the concrete structure of helical spring, corresponding responses under different impact frequency of the vehicle are imitated. The reason why the vehicle floor overresponds in some special frequency fields is explored based on analyzing the responses. When the impactions are in low frequency, the change of the spring has not been considered, but this does not affect the results. Because the transmission characters of velocity and acceleration are unanimous in helical spring, the responses characters of velocity and acceleration are also unanimous, the only difference is the magnitude, which can make use of acceleration responses to analyse velocity responses. 相似文献
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设计了一种自适应离心式机械摩擦阻尼传动系统。该系统主要是利用离心力随转速变化的运动特性实现机械传动装置输出运动的自适应速度控制。整套系统由齿轮传动组、离心轮、弹簧发条、钢丝滚筒四部分组成,着重对前三部分进行了设计计算与分析,并最终完成样机试制。通过对样机进行自适应速度测试试验,获得了摩擦阻力矩随滚筒转速变化的特征曲线,为离心式机械摩擦阻尼系统的设计提供理论上的技术参考,同时也为实现机械传动装置输出运动的自适应控制提供了一条新的设计思路。 相似文献
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为深入了解金属弹簧波导对太赫兹波的传输效果,对不同螺线间距金属弹簧的太赫兹波传输特性进行了实验研究。实验结果表明,对于线径0.8 mm、外直径12 mm、长14 cm的金属弹簧,在3.5/4.4 mm等较大的螺距下,弹簧波导反而能在较大的带宽下传导太赫兹波,并具有良好的偏振保持能力。3.5/4.4 mm螺距弹簧的太赫兹传输带宽均约为0.9 THz,且在其峰值频率处的传输损耗分别约为0.2 cm-1和0.27 cm-1。此外,金属弹簧能将太赫兹模式束缚在空气芯内传输,而非通过金属螺线导引传输。该研究结果对金属弹簧波导在太赫兹技术中的应用具有一定参考意义。 相似文献
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功率超声变幅杆振动能量传输性能的研究 总被引:7,自引:0,他引:7
能量传递是功率超声设备中一个非常关键和复杂的问题。这里就功率超声变幅杆在有负载情况下的速度波、力波和功率传递的特性从理论上进行了研究并得到了一些相关的结论,对提高超声设备能量传递效率和进一步研究整个超声振动系统的能量传递性能有重要意义 相似文献
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扭杆弹簧受短波冲击的响应研究 总被引:1,自引:0,他引:1
应用扭杆弹簧的波动传递特性,探讨单自由度系统受短波冲击的求解方法。在考虑扭杆弹簧的具体结构的情况下,对单自由度系统进行建模,与古典振动理论的建模方法进行比较。给出一个算例,得到了三种方法的响应结果。并对它们的响应进行分析,探讨了扭杆弹簧刚度变化对响应的影响。 相似文献
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本文研究摆线钢球减速器关键技术之一,无侧隙啮合副共轭齿形综合问题。给出了中心盘、行星盘上共轭封闭槽齿形方程式。讨论了封闭槽齿形的形成与顶切现象。为摆线钢球减速器的创新开发提供了依据。 相似文献
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LIU Zenghua ZHAO Jichen WU Bin HE Cunfu College of Mechanical Engineering Applied Electronics Technology Beijing University of Technology Beijing China 《机械工程学报(英文版)》2011,(3):487-494
Ultrasonic guided wave inspection is an effective non-destructive testing method which can be used for stress level evaluation in steel strands.Unfortunately the propagation velocity of ultrasonic guided waves changes due to temperature shift making the prestress measurement of steel strands inaccurate and even sometimes impossible.In the course of solving the problem,this paper reports on quantitative research on the temperature dependence of ultrasonic longitudinal guided wave propagation in long range steel strands.In order to achieve the generation and reception of a chosen longitudinal mode in a steel strand with a helical shaped surface,a new type of magnetostrictive transducer was developed,characterized by a group of thin clips and three identical permanent magnets.Excitation and reception of ultrasonic guided waves in a steel strand were performed experimentally.Experimental results shows that in the temperature range from-4 ℃ to 34 ℃,the propagation velocity of the L(0,1) mode at 160 kHz linearly decreased with increasing temperature and its temperature dependent coefficient was 0.90(m·s-1 ·(℃)-1) which is very close to the theoretical prediction.The effect of dimension deviation between the helical and center wires and the effect of the thermal expansion of the steel strand on ultrasonic longitudinal guided wave propagation were also analyzed.It was found that these effects could be ignored compared with the change in the material mechanical properties of the steel strands due to temperature shift.It was also observed that the longitudinal guided wave mode was somewhat more sensitive to temperature changes compared with conventional ultrasonic waves theoretically.Therefore,it is considered that the temperature effect on ultrasonic longitudinal guided wave propagation in order to improve the accuracy of stress measurement in prestressed steel strands.Quantitative research on the temperature dependence of ultrasonic guided wave propagation in steel strands provides an important basis for the compensation of temperature effects in stress measurement in steel strands by using ultrasonic guided wave inspection. 相似文献