scholarly journals Research on modal analysis method of Multiple Units car body in the preparation conditions

2021 ◽  
Vol 1820 (1) ◽  
pp. 012095
Author(s):  
Ya-Na Li ◽  
Shuo Li
Keyword(s):  
Modal Analysis ◽  
Analysis Method ◽  
Car Body ◽  
Preparation Conditions ◽  
Multiple Units

Modal and Local Modal Analysis of High Speed Train Car-Body

2012 ◽  
Vol 215-216 ◽  
pp. 800-803
Author(s):  
Tian Li Chen ◽  
Yao Hui Lu ◽  
Jing Zeng ◽  
Li Min Zhang
Keyword(s):  
Modal Analysis ◽  
Structural Design ◽  
High Speed ◽  
Ride Comfort ◽  
Side Wall ◽  
Local Mode ◽  
Analysis Method ◽  
Local Modes ◽  
Car Body ◽  
Finite Element Software

with the speed rising of railway train and the weight lightening of car-body, the frequency range of car-body is widened and the natural frequency is decreased. Especially, the local modes of car-body are caused by suspension device under the car-body bottom, which lead to large vibration response, influence the ride comfort and fatigue failure of structure. In this paper, the whole mode of car-body was analyzed through finite element software. The local mode of car-body bottom and side wall were computed by method of equivalent stiffness constrain. The results show that the local mode of car-body is mainly caused by asymmetry suspension device. The modal analysis method and local modal analysis method adopted in this essay provide the reference and guide the dynamic structural design.

Optimized Design of Aluminum Cross Car Beam (CCB) Based in Modal Strain Energy Analysis

2016 ◽  
Vol 877 ◽  
pp. 668-673
Author(s):  
Bo Liu ◽  
Zhong Cai Qiu ◽  
Qin Yang ◽  
Ke Wang ◽  
Xian He Wu
Keyword(s):  
Modal Analysis ◽  
Strain Energy ◽  
Energy Analysis ◽  
Simulation Software ◽  
Optimized Design ◽  
Modal Strain Energy ◽  
Car Body ◽  
New Energy ◽  
Nature Frequency ◽  
Energy Contour

An aluminium cross car beam (CCB) for new energy is designed with CATIA. And then,modal analysis is taken by using simulation software-NASTRAN. As nature frequencies can't meet the design target, optimization is performed according to the modal strain energy contour. After structure is strengthen, the first vertical nature frequency of the aluminum CCB(mounted on trimmed car body,with closures and interiors) reaches 35.4Hz.While the first lateral nature frequency reaches 36.5 Hz. Besides,comparing to steel CCB,the weight of the aluminum CCB reduces by4.4 kilogram.

INVESTIGATION OF NATURAL FREQUENCIES OF COMPLEX WATER PIPELINES

Akustika ◽  
2021 ◽  
pp. 2-7
Author(s):  
Antonina Sekacheva ◽  
Alexander Noskov ◽  
Lilia Pastukhova
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Residential Buildings ◽  
Geometrical Parameters ◽  
Analysis Method ◽  
Noise And Vibration ◽  
Software Packages ◽  
Resonant Modes ◽  
Water Pipelines ◽  
Ansys Workbench

The article deals with the problem of emergence of noise and vibration from pipelines of multi-storey residential buildings. The determination method of risk of increased noise and vibration using the modal analysis method in the ANSYS Workbench software packages is offered. The numerical modal analysis of straight pipeline sections with various geometrical parameters is carried out. Risk predictions of possible resonant modes are made. The maximum allowed span lengths between supports for sections of pipeline systems with a diameter of 15, 20, 25, 32, 40, 48, 60, 70, 102, 114, 140, 168, 180, 219 mm are offered.

Sensitivity Analysis of NVH Structure of Car Body Based on Modal Analysis

2021 ◽  
pp. 85-90
Author(s):  
Yongqiang Liu ◽  
Xin Liu ◽  
Lin Dou ◽  
Yu Luan ◽  
Lei Shi ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Modal Analysis ◽  
Car Body

Modal Analysis of Multi-Stepped Distributed-Parameter Rotor-Bearing Systems Using Exact Dynamic Elements

2001 ◽  
Vol 123 (3) ◽  
pp. 401-403 ◽  
Author(s):  
Seong-Wook Hong ◽  
Jong-Heuck Park
Keyword(s):  
Modal Analysis ◽  
Closed Form ◽  
Complete Analysis ◽  
Distributed Parameter ◽  
Analysis Method ◽  
Closed Form Solutions ◽  
Analysis Scheme ◽  
Rotor Bearing ◽  
The Matrix ◽  
Transcendental Functions

Although the exact dynamic elements have been suggested by the authors [1] and proved to be useful for the dynamic analysis of distributed-parameter rotor-bearing systems, difficulty remains in computation because of the presence of transcendental functions in the matrix. This paper proposes a complete analysis scheme for the exact dynamic elements, a generalized modal analysis method, to obtain exact and closed form solutions of time and frequency domain responses for multi-stepped distributed-parameter rotor-bearing systems. A numerical example is provided for validating the proposed method.

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