scholarly journals Analysis on the Vertical Coupled Vibration between Bogies and Metro Car Body

2011 ◽  
Vol 16 ◽  
pp. 825-831 ◽  
Author(s):  
Dao Gong ◽  
Wenjing Sun ◽  
Jinsong Zhou ◽  
Xiaobo Xie
Keyword(s):  
Coupled Vibration ◽  
Car Body

Experimental Investigation on Coupled Vibration Features of Suspended Monorail Train–Bridge System under Constant Speed and Braking Conditions

2021 ◽  
pp. 2150177
Author(s):  
Qinglie He ◽  
Yun Yang ◽  
Chengbiao Cai ◽  
Shengyang Zhu ◽  
Wanming Zhai
Keyword(s):  
Experimental Investigation ◽  
Longitudinal Vibration ◽  
Operating Conditions ◽  
Urban Traffic ◽  
Constant Speed ◽  
Coupled Vibration ◽  
Dynamic Features ◽  
Car Body ◽  
Emergency Braking ◽  
Bridge System

Suspended monorail transportation (SMT) plays an important role in alleviating the urban traffic pressure, and its vehicle–bridge dynamic features are significantly different from those of the traditional railway. To grasp the coupled vibration features of suspended monorail train–bridge system (SMTBS), this paper presents a comprehensive experimental investigation on the vehicle–bridge vibrational responses under different operating conditions. First, based on the Chengdu SMT test line in China, a full-scale field measurement of the coupled vibration responses of the SMTBS is elaborately conducted under constant speed conditions. Then, the vibrational responses of the SMTBS are analyzed in the time and frequency domains to reveal its coupled vibration features and vibration transmission characteristics. Further, considering an extreme train operating condition, the vibrational responses of the SMTBS are tested and analyzed under train emergency braking; and the vibration features of the vehicle and bridge are examined for emergency braking, along with several key indexes evaluated for the train braking performance. Results show that the vibrational accelerations transmitted from the frame to the center pin and then to the carbody will be significantly decreased in turn, and the vibrational dominant frequencies of the bogie, center pin, and carbody mainly fall with 0–100[Formula: see text]Hz, 0–50[Formula: see text]Hz, and 0–20[Formula: see text]Hz, respectively. Under moving train loads, the box beam produces plentiful high-frequency vibrations and the vibrations transmitted from the driving track to the top plate are drastically reduced. The train braking significantly intensifies the car-body longitudinal vibration; however, it has small influences on the car-body vertical and lateral vibrations.

Coupled vibration of passenger and lightweight car-body in consideration of human-body biomechanics

2006 ◽  
Vol 44 (sup1) ◽  
pp. 601-611 ◽  
Author(s):  
M. Nagai ◽  
H. Yoshida ◽  
T. Tohtake ◽  
Y. Suzuki
Keyword(s):  
Human Body ◽  
Coupled Vibration ◽  
Car Body

CALCULATION-EXPERIMENTAL METHOD FOR DEFINITION OF LOWEST FREQUENCY IN BENDING VIBRATIONS OF COACH CAR BODY IN VERTICAL PLANE BASED ON IDENTIFICATION OF ITS BENDING STIFFNESS

2020 ◽  
Vol 2020 (9) ◽  
pp. 35-46
Author(s):  
Aleksandr Skachkov ◽  
Viktor Vasilevskiy ◽  
Aleksey Yuhnevskiy
Keyword(s):  
Least Squares Method ◽  
Vertical Plane ◽  
Bending Stiffness ◽  
Dimensional Problem ◽  
Euler Beam ◽  
Bending Vibrations ◽  
Car Body ◽  
Variable Function ◽  
Experimental Values ◽  
Definition Of

The consideration of existing methods for a modal analysis has shown a possibility for the lowest frequency definition of bending vibrations in a coach car body in a vertical plane based on an indirect method reduced to the assessment of the bending stiffness of the one-dimensional model as a Bernoulli-Euler beam with fragment-constant parameters. The assessment mentioned can be obtained by means of the comparison of model deflections (rated) and a prototype (measured experimentally upon a natural body) with the use of the least-squares method that results in the necessity of the solution of the multi-dimensional problem with the reverse coefficient. The introduction of the hypothesis on ratability of real bending stiffness of the prototype and easily calculated geometrical stiffness of a model reduces a multi-dimensional problem incorrect according to Adamar to the simplest search of the extremum of one variable function. The procedure offered for the indirect assessment of bending stiffness was checked through the solution of model problems. The values obtained are offered to use for the assessment of the lowest frequency of bending vibrations with the aid of Ritz and Grammel methods. In case of rigid poles it results in formulae for frequencies into which there are included directly the experimental values of deflections.

Coupled vibration model of cables and its parameter analysis

2015 ◽  
Vol 32 (3) ◽  
pp. 231
Author(s):  
Haitao Liu ◽  
Minghai Wei ◽  
Kun Lin ◽  
Yiqing Xiao
Keyword(s):  
Parameter Analysis ◽  
Coupled Vibration ◽  
Vibration Model

Overview of Forming and Formability Issues for High Volume Aluminium Car Body Panels

2006 ◽  
Vol 519-521 ◽  
pp. 795-802 ◽  
Author(s):  
Dominique Daniel ◽  
Gilles Guiglionda ◽  
Pierre Litalien ◽  
Ravi Shahani
Keyword(s):  
New Technologies ◽  
High Volume ◽  
Production Lines ◽  
Particle Generation ◽  
Car Body ◽  
Conventional Technology ◽  
Sheet Products ◽  
Cost Efficient ◽  
Aluminum Panels ◽  
Fine Tune

Cost-efficient designs of aluminum autobody structures consist mainly of stampings using conventional technology. Progress in metallurgy and forming processes has enabled aluminum body panels to achieve significant market share, particularly for hoods. Fast bake hardening alloys with better hemming performance were developed for improved outer panel sheet products. Specific guidelines for handling and press working were established to form aluminum panels using similar schedules and production lines as steel parts. Stamping productivity was improved by optimization of the trimming process to reduce sliver/particle generation and resulting end-of-line manual rework. Both hemming formability and trimming quality not only depend on tooling setup but also on microstructural features, which govern intrinsic alloy ductility. Targets for the next high volume aluminum car body applications, such as roof panels and doors, require higher strength and/or better formability. The challenges of complex stampings can be met with optimized alloys and lubricants, with improved numerical simulation to fine-tune stamping process parameters, and with the introduction of new technologies. Warm forming was examined as a potential breakthrough technology for high volume stamping of complex geometries.

scholarly journals The Influence of Surface Preparation of the Steel during the Renovation of the Car Body on Its Corrosion Resistance

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 384
Author(s):  
Dariusz Ulbrich ◽  
Jakub Kowalczyk ◽  
Arkadiusz Stachowiak ◽  
Wojciech Sawczuk ◽  
Jaroslaw Selech
Keyword(s):  
Corrosion Resistance ◽  
Glass Bead ◽  
Salt Spray ◽  
Zinc Coating ◽  
Surface Preparation ◽  
The Other ◽  
Average Thickness ◽  
Spray Chamber ◽  
Car Body ◽  
Abrasive Blasting

The article presents the influence of the applied method used for removing the varnish coat on the corrosion resistance of the car body sheet. The tests were carried out on samples prepared from factory-painted car body elements with pearlescent, metallized and acrylic varnish. Removal of the varnish coat was performed by sandpaper grinding, glass bead blasting, disc blaze rapid stripping, soda blasting and abrasive blasting with plastic granules. The average thickness of the factory-painted coating depending on the type of lacquer ranged from about 99 to 140 µm. On the other hand, after removing the varnish, the thickness of the protective zinc coating ranged from 2 to 12.7 µm. The highest values of the zinc coating were obtained for samples in which the varnish was removed by the method such as soda blasting and abrasive blasting with plastic granules. For these two methods of surface preparation, the damage to the zinc layer protecting the steel against corrosion is the smallest and the percentage of zinc in the surface layer ranges from 58% to 78%. The final stage of the research was to test the samples after removing the varnish coat in a two-hour exposure to the corrosive environment in a salt spray chamber. Samples with the surface prepared by grinding with sandpaper reached the level of surface rusting Ri 5, while in the case of soda blasting and the use of plastic granules, no corrosion centers were observed on the surface of the car body sheet.

scholarly journals Validation of Part Holder Models of Car Body Upper Line Dies for Return Stroke Loads

2021 ◽  
Vol 1157 (1) ◽  
pp. 012073
Author(s):  
M Burkart ◽  
M Liewald ◽  
J Wied ◽  
C Kaminsky
Keyword(s):  
Return Stroke ◽  
Car Body ◽  
Part Holder
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