Function Simulation Analysis for Conical Spring of DANA Axis-Fixed Transmission

2011 ◽  
Vol 305 ◽  
pp. 57-60
Author(s):  
Da Lei Li ◽  
Yue Feng Yin ◽  
Fang Fang Ding
Keyword(s):  
Natural Frequencies ◽  
Simulation Analysis ◽  
Good Stability ◽  
Modal Shape ◽  
Nonlinear Characteristics ◽  
Critical Part ◽  
Service Load ◽  
Deformation Law ◽  
Vibration Attenuation

The conical spring is one critical part of DANA MHR-3200 series Transmission, its structure is compact and it has good stability and used for bearing larger load and vibration attenuation. Using SolidWorks Simulation to conduct simulation analysis for the stiffness and modality of conical spring, acquire the deformation law of spring under service load, the stiffness curve with nonlinear characteristics, the first four orders natural frequencies and its modal shape, which will lay a foundation for the RE design of conical spring and provide basis for its reconfiguration and repair after lose efficacy.

scholarly journals Cantilever Beam Metastructure for Active Broadband Vibration Suppression

2020 ◽  
Author(s):  
Ratiba Fatma Ghachi ◽  
Wael Alnahhal ◽  
Osama Abdeljaber
Keyword(s):  
Cantilever Beam ◽  
Natural Frequencies ◽  
Vibration Suppression ◽  
Research Work ◽  
Peak Frequency ◽  
Experimental Frequency ◽  
Transmission Frequency ◽  
Vibration Attenuation ◽  
The Masses ◽  
Zigzag Structure

This paper presents a beam structure of a new metamaterial-inspired dynamic vibration attenuation system. The proposed experimental research presents a designed cantilevered zigzag structure that can have natural frequencies orders of magnitude lower than a simple cantilever of the same scale. The proposed vibration attenuation system relies on the masses places on the zigzag structure thus changing the dynamic response of the system. The zigzag plates are integrated into the host structure namely a cantilever beam with openings, forming what is referred to here as a metastructure. Experimental frequency response function results are shown comparing the response of the structure to depending on the natural frequency of the zigzag structures. Results show that the distributed inserts in the system can split the peak response of the structure into two separate peaks rendering the peak frequency a low transmission frequency. These preliminary results provide a view of the potential of research work on active-controlled structures and nonlinear insert-structure interaction for vibration attenuation.

scholarly journals Eurocodes for bridge design versus mechanics

2013 ◽  
Vol 12 (2) ◽  
pp. 031-038
Author(s):  
Sławomir Karaś ◽  
Wioleta Czubacka
Keyword(s):  
Environmental Impact ◽  
Shear Strain ◽  
Natural Frequencies ◽  
Dynamic Problems ◽  
Shear Lag ◽  
Bridge Design ◽  
Service Load ◽  
Elementary Concept ◽  
As Effects

Regulations on which designers base their process of designing of any engineer structures should  include and combine mechanics, loads and dimensioning. It is not always the case as far as eurocodes are concerned. Ambiguities appear everywhere, which  sometimes leads to  incorrect understanding of a norm. The authors meticulously analysed  basic mechanical terms. Their digressions began with  the concepts of strain and deformation that have discrepant definitions in sources from other countries. The next part of article discusses the concept of „shear lag”. It is treated as an elementary concept in the eurocodes, although is has not been defined yet. Other sources define it as cooperating width and shear strain in the beam flanges or as stretching. Polish translation mentions the effect of „wide stripes”. The authors focused also on dynamics – especially while discussing first natural frequencies denoted as “n0”. They scrutinised  the norm EN 1991-2 in which dynamic problems of bridges are understood as effects of service load when the  environmental impact is not included. As always, in a situation when there is a doubt, it is possible apply the to accurate mechanics rules. To sum up, Polish versions of bridge eurocodes should be corrected to be unambiguous and useful in a design.

scholarly journals Rubber Stiffness Optimization for Floor Vibration Attenuation of a Light Bus Based on Matrix Inversion TPA

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Hui Shi ◽  
Wenku Shi ◽  
Changhai Yang ◽  
Guozheng Liu ◽  
Zhaomeng Fan ◽  
...  
Keyword(s):  
Natural Frequencies ◽  
Optimization Procedure ◽  
Matrix Inversion ◽  
Vibration Test ◽  
Transfer Path ◽  
Stiffness Optimization ◽  
Market Competitiveness ◽  
Vibration Attenuation ◽  
The Matrix ◽  
Floor Vibration

The NVH characteristics of light buses are a very important performance for market competitiveness. To solve the serious floor vibration of a light bus at speed of 60 km/h and 90 km/h, we first derive the matrix inversion TPA (MITPA) method, and then transfer path contribution is analyzed by applying matrix inversion TPA with TPA model establishment, operational vibration test, and FRF measurement. Next, the energy decoupling rate of the powertrain mount system (PMS) is optimized by rubber stiffness optimization based on the path contribution analysis taking both amplitude and phase into consideration. The optimized natural frequencies and energy decoupling rate indicate that energy decoupling rate (EDR) of each DoF of the powertrain mount system is improved. Finally, to verify the optimization effect, this paper implements an operational vibration test with optimized mount installed. The results indicate that floor vibration of postoptimization is improved significantly compared with that of preoptimization. This paper offers a method for engineers to improve vibration problem of vehicle by combining experimental TPA for identification of dominant paths with optimization procedure.

Vibration Analysis for Pipeline Connected with Centrifugal Pump by FEM

2012 ◽  
Vol 479-481 ◽  
pp. 1237-1242 ◽  
Author(s):  
Jun Hua Dong ◽  
Xiang Fu Bao ◽  
Peng Bo Xie
Keyword(s):  
Yield Strength ◽  
Centrifugal Pump ◽  
Dynamic Characteristics ◽  
Vibration Analysis ◽  
Natural Frequencies ◽  
Pipeline System ◽  
Maximal Amplitude ◽  
Modal Shape ◽  
Major Principal Stress ◽  
Continuous Dynamic

The vibration of a complicated pipeline connected with centrifugal pump has been studied by ANSYS. The first 32 natural frequencies and the first five modal shape of the pipeline system is obtained by Modal analysis. The result shows that its excited frequency is close to the 30th natural frequency of the pipeline system，which will result in resonance. Because excited force caused by pulsatile fluid in pipe can make pipeline to has a compulsive vibrations, harmonic respones analysis is used to determine continuous dynamic characteristics of pipeline. The critical frequencies of node with the maximal amplitude at 30th modal shape are 12.452Hz and 56.284Hz by investigating its spectrum image of displacement. The major principal stress at two critical frequencies, far exceeding the yield strength of material, is respectively -1223MPa and 621 MPa, which demonstrates that the pipeline are very incidental to be destroyed.

Study on Impact of Powertrain Mounting Stiffness on Vehicle Vibration Characteristics

2012 ◽  
Vol 605-607 ◽  
pp. 1154-1157
Author(s):  
Yu Zhuo Men ◽  
Hai Bo Yu ◽  
Hua Wang ◽  
Liang Xu
Keyword(s):  
Simulation Model ◽  
Simulation Analysis ◽  
Drive Shaft ◽  
Dynamics Simulation ◽  
Interpolation Function ◽  
Vibration System ◽  
Nonlinear Characteristics ◽  
Model Reliability ◽  
Simulation Results ◽  
Stiffness And Damping

ADAMS was used to establish the dynamics simulation model of a truck vehicle vibration system, while the engine, drive shaft and tire excitations were added to the model. For nonlinear characteristics of rubber mounting components stiffness and damping, input was conducted by the use of interpolation function SPLINE. Through the comparison of road tests and simulation results, the model reliability was verified and simulation analysis was conducted on this basis. The results show that reasonable selection and matching of powertrain mounting stiffness, mounting position could effectively improve the performance of vehicle vibration system.

Effect of the Aero-Engine Mounting Stiffness on the Whole Engine Coupling Vibration

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
M. J. Qu ◽  
G. Chen
Keyword(s):  
Natural Frequencies ◽  
Coupling Factor ◽  
Fe Model ◽  
Modal Shape ◽  
Coupling Vibration ◽  
Turbofan Engines ◽  
Aero Engine ◽  
Different Types ◽  
Intrinsic Vibration ◽  
Coupling Phenomena

A finite element (FE) model of the rotor tester of an aero-engine, having a thin-walled casing structure, mounted with the way of an actual engine, is developed to simulate the intrinsic vibration characteristics under actual engine-mounting condition. First, a modal experiment of the rotor tester for the whole aero-engine is conducted, and the FE model is modified and validated based on the modal experimental results. Second, the first three orders of natural frequencies and the modal shapes are evaluated using the modified FE model under three different types of mounting stiffness, namely, a fixed mounting boundary, a free mounting boundary, and a flexible mounting boundary. Subsequently, the influences of the mounting stiffness on the coupling vibration of the rotor and stator are studied via a new rotor–stator coupling factor, which is proposed in this study. The results show that the higher the rotor–stator coupling degree of the modal shape, the greater the influence of the mounting condition on the modal shape. Moreover, the influence of the mounting stiffness on the rotor–stator coupling degree is nonlinear. The coupling phenomena of the rotor and stator exist in many modal shapes of actual large turbofan engines, and the effect of mounting stiffness on the rotor–stator coupling cannot be ignored. Hence, the mounting stiffness needs to be considered carefully while modeling the whole aero-engine and simulating the dynamic characteristics of the whole aero-engine.

Prestress Force Effection on Natural Frequencies of Simply Supported Beams

2013 ◽  
Vol 275-277 ◽  
pp. 1172-1175
Author(s):  
Han Bing Liu ◽  
Long Lin Wang ◽  
Guo Jin Tan ◽  
Yong Chun Cheng
Keyword(s):  
Finite Element ◽  
Dynamic Simulation ◽  
Natural Frequencies ◽  
Simulation Analysis ◽  
Element Model ◽  
Quantitative Relation ◽  
Steel Beam ◽  
Simply Supported ◽  
Prestressing Force ◽  
The Finite Element Model

Natural frequencies of bridges have certain sensitivity to prestressing force, so the identification of effective prestressing force based on bridges' natural frequencies is a effective method. This paper uses Finite Element Methods to establish the finite element model of prestressed steel beam, and then conducts dynamic simulation analysis of the natural frequencies of the simply-supported bridges on the condition of different prestressing forces and different reinforcement eccentricity distance arrangements. Based on the results, it analyzes the law and the extent of prestressing force's influence on the natural frequencies, and at last makes the quantitative relation of the prestressing force and the natural frequencies of the bridges. It supplies the theoretic support for the identification of effective prestressing force in the prestressed simply supported beams.

Natural Frequency Analysis of Liquid-Filled Tanks

2005 ◽  
Author(s):  
Rouzbeh Amini ◽  
Grant Warner ◽  
Hamid Nayeb-Hashemi
Keyword(s):  
Natural Frequency ◽  
Frequency Analysis ◽  
Natural Frequencies ◽  
Water Levels ◽  
Resonance Phenomenon ◽  
Modal Shape ◽  
Earthquake Excitation ◽  
Element Analysis ◽  
The Difference ◽  
Natural Frequency Analysis

Traditionally, the cantilever modal shape of liquid-filled tanks has been considered as the most critical mode. However, recent research has demonstrated that natural frequencies associated with some circumferential modes might be close to the frequency of earthquake excitation. This can lead to a resonance phenomenon, and consequently failure of the tanks. In this paper, we perform Natural Frequency Analysis of fluid-filled tanks, using finite element analysis. Modeling and solution employ ADINA potential-based flow elements, which require the assumption of inviscid, irrotational and incompressible flow. The problem is solved for different geometries and water levels of tanks; the results are compared with the current results in the literature and the difference is demonstrated.

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