共查询到20条相似文献，搜索用时 621 毫秒
1.
赵建宁 《河北职业技术学院学报》2014,(1):39-42
轿车车门是轿车车身重要的组成部分,它的设计质量直接影响整车的安全性、造型效果、空气动力学特性、密封性及噪声等。轿车车门动态特性分析是基于车门有限元分析模型的建立,对轿车车门在自由状态下进行模态分析。文章在四种工况下对轿车车门的扭转刚度、下垂刚度进行分析。通过分析,为轿车车门结构设计选择及结构优化提供了理论依据。 相似文献
2.
《实验室研究与探索》2020,(7):112-117
为对某赛车车架的动态特性进行评价,建立了车架的有限元模型,通过仿真模态分析的方法对其动态特性进行了仿真,获得了车架的前6阶振型图。搭建了车架实验模态分析的测试平台,采用实验模态分析方法对仿真的结果进行了验证。对比实验模态和仿真模态分析得到的固有频率,前6阶相对误差均低于10%,两者固有频率吻合度较高且振型也具有较高的一致性。根据仿真模态计算结果和实验模态测量结果,分析了该赛车车架的动态特性,发现该车架在外界激励下均不会发生共振。对比分析结果表明,各阶模态振型在固定频率附近实验模态和仿真模态具有相同的振型,动态特性较好,研究方法和结果对未来赛车车架的设计有一定的指导作用。 相似文献
3.
车身是汽车的关键部件之一,其动态特性直接影响到汽车的运行性能和使用寿命。因此,在设计阶段应对其车身的动态特性做尽可能准确的估算。文章利用试验模态分析的方法对车身的动态特性进行研究,为整车的动态特性的分析和结构设计的修改提供方法和理论依据。 相似文献
4.
为了研究空气弹簧成型鼓固有频率是否与电机激励频率产生共振,以外径320 mm的成型鼓为研究对象,先利用SolidWorks建立成型鼓的几何模型,并对几何模型进行模态分析前处理,再利用OptiStruct求解器对成型鼓网格单元模型进行前六阶模态分析求解。研究结果表明：成型鼓结构加强前,其一阶模态的固有频率为20.90 Hz;结构加强后,一阶模态的固有频率为58.93 Hz,远离激励频率,不会产生共振造成破坏。通过模态分析进一步发现成型鼓优化前后的二三阶、四五阶模态分别近似相等,这表明成型鼓结构存在相邻固有频率相等的情况。该分析方法对成型鼓研发具有较好的指导作用。 相似文献
5.
车身是汽车的关键部件之一，其动态特性直接影响到汽车的运行性能和使用寿命。因此，在设计阶段应对其车身的动态特性做尽可能准确的估算。文章利用试验模态分析的方法对车身的动态特性进行研究，为整车的动态特性的分析和结构设计的修改提供方法和理分依据。 相似文献
6.
模态测试技术是汽车结构动态设计与整车舒适性优化的重要方法。文章介绍了如何利用模态测试技术对汽车零部件的振动进行动态分析,通过试验获得了汽车车门的模态参数,并进行有效性验证和数据分析,结果表明该试验方法合理可靠,所获参数有效合理。 相似文献
7.
根据某车室壁板结构有限元模型,建立了车室声腔有限元模型.基于声学模态分析理论,利用SYSNOISE软件对该声学有限元模型进行自由模态分析,获得了车室声腔的各阶固有频率和模态振型,并将声学模态分析结果与汽车的各种激励源频率特性进行分析比较,其结论可用来改进车身系统的声学设计. 相似文献
8.
刘成武 《福建工程学院学报》2008,6(Z1)
车身结构模态分析是车身NVH特性研究的重要内容,识别车身系统模态对避免车身结构与声腔共振、降低车内噪声有着重要的意义.文章以某轿车车身为例,利用有限元法建立车身结构模型,进行模态分析计算,从而获得车身结构的模态频率和变形部位. 相似文献
9.
为研究半挂车架设计及动态特性,使用ANSYS有限元软件对XWS9360TZ-1骨架式集装箱半挂车架进行模态分析,确定其固有频率和振型,以清晰的动态图象描述结构在受到激励时的表现,并分析其动态特性. 相似文献
10.
《常熟理工学院学报》2015,(4)
利用有限元分析软件ANSYS Workbench建立汽车扰流板的三维有限元模型,并对其进行预应力模态分析.采用子空间法提取预应力模态分析结果,获得各种不同车速下的汽车扰流板各阶固有频率和主振型,与不考虑预应力的模态分析结果进行对比分析.研究表明预应力提高了扰流板的各阶固有频率.随着车速的提高,各阶模态频率也不断增大,但低阶模态频率的变化比高阶模态频率变化更加显著. 相似文献
11.
通过Matlab建立某型汽车动力传动系13自由度扭转振动的分析模型,对其在临界转速下振动异常的现象加以分析研究,利用得到广泛使用的偏导数分析方法对该车在理想的无阻尼扭转振动下,系统的固有频率对转动惯量和扭转刚度的灵敏度进行了计算.从转动惯量和扭转刚度的角度分析出对固有频率最敏感的结构参数,从而以避开发动机的激励为目的对其进行修改,实现对固有频率的优化.并结合实验说明理论分析起到了很好的作用,同时还会降低厂家的修改设计费用. 相似文献
12.
A dynamic finite element method combined with finite element mixed formula for contact problem is used to analyze the dynamic characteristics of gear system. Considering the stiffness excitation, error excitation and meshing shock excitation, the dynamic finite element model is established for the entire gear system which includes gears, shafts, bearings and gearbox housing. By the software of I-DEAS, the natural frequency, normal mode, dynamic time-domain response, frequency-domain response and one-third octave velocity grade structure borne noise of gear system are studied by the method of theoretical modal analysis and dynamic response analysis. The maximum values of vibration and structure borne noise are occurred at the mesh frequency of output grade gearing. 相似文献
13.
为检验在役大跨径悬索桥结构的动力性能,对主跨128 m地锚式悬索桥进行动力试验.测试其自振频率、振型和阻尼比;激振试验中,测试桥跨结构在汽车以不同速度通过桥跨和在桥上特定位置跳车时桥跨结构的动应变、动位移、振幅以及加速度等动力响应,计算得出冲击系数.并将实测结果与有限元结果进行对比分析.结果表明,该悬索桥具有较好的竖向刚度、横向刚度;汽车在桥上运行时对桥跨结构有一定的冲击作用但并不明显,有障碍行车舒适度较差. 相似文献
14.
《浙江大学学报(A卷英文版)》2021,(1)
To improve the low-frequency vibration reduction effect of a steel spring floating slab track(FST), nonlinear quasizero-stiffness(QZS) vibration isolators composed of positive stiffness elements(PSEs) and negative stiffness elements(NSEs) were used to support the FST. First, considering the mechanical characteristics of the nonlinear QZS vibration isolators and the dynamic displacement limit(3 mm) of the FST, the feasible parameter groups were studied with the nonlinear stiffness variation range and bearing capacity as evaluation indices. A vertical vehicle quasi-zero-stiffness floating slab track(QZS-FST) coupled dynamic model was then established. To obtain a reasonable nonlinear stiffness within a few millimeters, the original length of the NSEs must be analyzed first, because it chiefly determines the stiffness nonlinearity level. The compression length of the NSEs at the equilibrium position must be determined to obtain the low stiffness of the floating slab without vehicle load. Meanwhile, to meet the dynamic displacement limit of the FST, the PSE stiffness must be increased to obtain a higher stiffness at the critical dynamic displacement. Various stiffness groups for the PSEs and NSEs can provide the same dynamic bearing capacity and yet have a significantly different vibration reduction effect. Excessive stiffness nonlinearity levels cannot effectively improve the vibration reduction effect at the natural frequency. Furthermore, they also significantly amplify the vibrations above the natural frequency. In this paper, the vertical vibration acceleration level(VAL) of the floating slab and the supporting force of the FST can be decreased by 6.9 dB and 55%, respectively, at the resonance frequency. 相似文献
15.
Based on the modal analysis theory and by using the dynamics finite element analysis model of a three-dimensional assembly circuit module, dynamic characteristics of circuit module have been studied, including both natural characteristics analysis and dynamic responses analysis. Using a subspace method, modal analysis is first carried out. The first 6 orders of natural frequencies and vibration modes are obtained. Influence of the number of the Z-shaped metal slices on dynamic characteristics of the entire structure is also studied.Harmonic response analysis is then conducted. The steady-state response when the circuit module is subjected to harmonic excitation is determined. A curve of the response values against frequencies is obtained. As a result, the optimal number of Z-shaped metal slices can be determined, and it can be assured that the three-dimensional assembly circuit module has good performance in terms of the dynamic characteristics. 相似文献
16.
为了获取某四驱汽车防滑差速器壳体的固有振动特性和验证所建有限元模型的正确性,以某四驱汽车防滑差速器壳体为研究对象,首先基于Abaqus软件对其进行模态仿真分析,得到了防滑差速器前6阶固有特性参数及其振型;然后运用锤击实验对防滑差速器进行模态分析实验,测取其振动情况;最后将两种方法获取的差速器壳体前6阶振型及振动频率进行对比。结果发现两种方法获取的各阶振型基本一致,固有频率误差在5%以内。这种以模态仿真分析为前提,模态实验为补充,仿真结果与实验结果相对比的分析方法有效地验证了有限元模型的正确性,为防滑差速器的有限元分析提供了有效的参考依据。 相似文献
17.
This paper proposes a new numerical simulation method for analyzing the parametric vibration of stay cables based on the theory of nonlinear dynamic response of structures under the asynchronous support excitation. The effects of important parameters related to parametric vibration of cables, i.e., characteristics of structure, excitation frequency, excitation amplitude, damping effect of the air and the viscous damping coefficient of the cables, were investigated by using the proposed method for the cables with significant length difference as examples. The analysis results show that nonlinear finite element method is a powerful technique in analyzing the parametric vibration of cables, the behavior of parametric vibration of the two cables with different Irvine parameters has similar properties, the amplitudes of parametric vibration of cables are related to the frequency and amplitude of harmonic support excitations and the effect of distributed viscous damping on parametric vibration of the cables is very small. 相似文献
18.
林森泉 《Journal of Zhangzhou Technical Institute》2020,(1):78-84
针对传统汽车悬置系统能量解耦率低,振动传递率高的问题,建立了悬置系统动力学分析模型。将汽车动力总成悬置系统的振动性能分析和参数测试与系统模态耦合和振动能量解耦匹配理论相结合,采用MATLAB软件编制的程序来计算系统能量分布,并在满足悬置系统设计约束的前提下对系统悬置刚度值与布置参数进行了优化。某型号汽车悬置系统优化设计与振动性能测试结果验证了优化方案的有效性和可行性。 相似文献
19.
The dynamic interaction between maglev vehicle and three-span continuous guideway is discussed. With the consideration of control system, the dynamic interaction model has been developed. Numerical simulation has been performed to study dynamic characteristics of the guideway. The results show that bending rigidity, vehicle speed, span ratio and primary frequency all have important influences on the dynamic characteristics of the guideway and there is no distinct trend towards resonance vibration when fl/（v/l） equals 1.0. The definite way is to control impact coefficient and acceleration of the guideway. The conclusions can serve the design of high-speed maglev three-span continuous guideway. 相似文献
20.
对某大型水轮发电机转子轴系在发生两相线间突然短路时由电磁力矩引起的扭振进行了研究,探讨了由参数激励、强迫激励以及二者联合作用下轴系扭振共振的规律．首先应用有限元法求得了轴系扭振的前五阶固有频率及振型,接着求得了考虑多磁极（凸极）和振动偏心双重影响下的气隙磁场能量,进而求得了电磁力矩的表达式．应用电机耦联系统的能量法,建立了轴系扭振共振时的一阶近似方程,并对稳态解进行了幅频特性分析,最后计算了轮系的动态应力．研究结果表明,两相线间突然短路时电磁转矩很大,并且其中的100Hz成分与轴系扭振的第二阶固有频率101．182Hz很接近,极剔］起共振,造成破坏,必须设法避免． 相似文献