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Dynamic Analysis of Cantilever Structure for Catenary System
Issue:
Volume 6, Issue 3, May 2021
Pages:
52-57
Received:
10 May 2021
Accepted:
24 May 2021
Published:
3 June 2021
Abstract: Structural dynamics analysis is widely used in the fields of civil engineering, automobile manufacturing industry, Aerospace industry, and construction machinery. It is rarely applied in the railway transportation industry, especially the catenary arm structure. In this paper, a dynamic analysis of the cantilever structure is carried out, and the natural frequency of the cantilever structure is obtained. Through research, the frequency range that can cause the resonance of the cantilever structure is found and compared with the structural vibration frequency caused by the external load in the actual working condition. For this purpose, a finite element model of cantilever structure was created based on engineering practice. Static analysis was done by using finite element method to test the model’s strength and stiffness. Then a dynamic model was made and modal analysis was done in order to get the first ten natural frequencies and corresponding modes. Resonance frequency was got by taking harmonic response analysis under the influence of external load. After all of these, a conclusion was made and the overall structure of the resonance phenomenon will not occur in actual situation which coincides with engineering actuality. It provides theoretical support for engineering practice. And also provides a theoretical basis for the follow-up structural anti-loose research.
Abstract: Structural dynamics analysis is widely used in the fields of civil engineering, automobile manufacturing industry, Aerospace industry, and construction machinery. It is rarely applied in the railway transportation industry, especially the catenary arm structure. In this paper, a dynamic analysis of the cantilever structure is carried out, and the n...
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A New Method for Solving the Problem of Determining the Characteristics of Spatial Stiffness and Elasticity of the Rail Threads and Stresses and Strains in Rails
Eduard Danilenko,
Vitalii Molchanov
Issue:
Volume 6, Issue 3, May 2021
Pages:
58-80
Received:
12 May 2021
Accepted:
1 June 2021
Published:
21 June 2021
Abstract: The reference data given in technical literature on the characteristics of spatial stiffness and elasticity of rail threads in the conditions of joint action on the rails of vertical and horizontal lateral forces and torsion are very different and in some cases contradictory. This situation is due to the lack of an accurate analytical solution to this problem and the provision for reference materials only experimental research data, which are clearly different, not only for different railway structures, but also significantly differ in different conditions of acting external forces (P, H, Mtor). The purpose of this article is to present a new method of analytical solution of the problem of determining the spatial characteristics of stiffness and elasticity of rail threads and also computation the stresses and strains that occur in them, under conditions of complex joint action on rail threads of vertical and horizontal dynamic forces (Pdyn, Hdyn) simultaneously with the external torque moment Mtor arising from off-center forces applied to the rails from wheel loads. The complex method of solving the problem was used in the paper. It includes the theoretical part and the results of the experiment. Using the experimental researches characteristics of horizontal lateral stiffness of the rail threads of the head and sole at different constructions of the modern rail fastenings was measured. The second task of determination of the real values of the characteristics of spatial elasticity and stiffness modulus of the rail thread under joint vertical and lateral horizontal bends of the rail in conjunction with its simultaneous torsion was solved by the theoretical methods. As the results of author’s researches were obtained new values of the characteristics of spatial stiffness and elasticity modulus of rail threads under joint vertical and lateral horizontal bends of the rail in conjunction with its simultaneous torsion. These characteristics were obtained for the modern railway track constrictions with rails (R65, R50, UIC60) on concrete and wooden sleepers and with rail fastenings unlined or lined types (KB, KPP-5, KPP-1, D0). And also these characteristics were obtained in the functional dependence on the ratio of vertical and horizontal lateral forces P/H.
Abstract: The reference data given in technical literature on the characteristics of spatial stiffness and elasticity of rail threads in the conditions of joint action on the rails of vertical and horizontal lateral forces and torsion are very different and in some cases contradictory. This situation is due to the lack of an accurate analytical solution to t...
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Investigating the Impact of Income, Belief and Culture on Road Safety
Faisal Magableh,
Jamal Al Matawah,
Brian Freeman
Issue:
Volume 6, Issue 3, May 2021
Pages:
81-94
Received:
24 May 2021
Accepted:
15 June 2021
Published:
23 June 2021
Abstract: People’s lives are influenced by their socio-economic, culture, and belief as they shape their behaviors and lifestyles. Belief and culture of people in different countries may profoundly affect their perception towards road safety. Lifestyle controls the perception of people regards road safety. Culture is the navigation system that guides people through their daily life when they enact their lifestyle within their cultural context. The overall aim of this research is to investigate whether there is any relationship between road safety and the income, culture, and beliefs of people. Data from 175 countries that includes income, beliefs and cultures of different countries was used in cross-cultural and cross belief comparisons to obtain a better understanding of the effect of each factor on road safety. The findings showed a remarkable difference in road safety between high, middle, and low-income countries. Different cultures and religions showed different levels of road safety. Whether or not road safety is dependent on these factors requires more studying and analysis. The results show no relationship between road safety and culture or religious beliefs. A noticeable relationship was found between income and road safety level. Countries where traffic regulations are more stringently enforced were found to have the best road safety levels. The outcome of the study can be beneficial for policy and decision-makers when designing road safety strategies and awareness campaigns.
Abstract: People’s lives are influenced by their socio-economic, culture, and belief as they shape their behaviors and lifestyles. Belief and culture of people in different countries may profoundly affect their perception towards road safety. Lifestyle controls the perception of people regards road safety. Culture is the navigation system that guides people ...
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Experimental Study and Measures on Engineering Characteristics of Diatomite Subgrade in Shengzhou
Issue:
Volume 6, Issue 3, May 2021
Pages:
95-106
Received:
11 May 2021
Accepted:
27 May 2021
Published:
26 June 2021
Abstract: This paper takes the newly built railway passing through the diatom land area of Shengzhou and Xinchang in Zhejiang Province as an example. And based on the field test of soil samples, this paper pointed out that due to low natural density, large void ratio, high water content, dry shrinkage and wet expansion, relative deformation and strength, The diatomite are not suitable to be directly used as building foundation. Based on the static load of single pile, bearing capacity of composite foundation and in-situ vibration test of foundation bed, it proposed that CFG pile, plain concrete pile and reinforced concrete pile are suitable for diatomite foundation reinforcement. While screw pile has insufficient bearing capacity, due to soil compaction effect and poor pile forming effect of high pressure jet grouting pile. CFG and plain concrete pile composite foundation can meet the requirements of diatomite subgrade deformation, and plain concrete pile is much better. The raft structure has better integrity. The capillary waterproof and drainage board can significantly improve the waterproof and drainage effect, and reduce the adverse effect of dynamic load on diatom soil foundation. Based on the slope rainfall test, it is proposed that diatomite natural slope is easy to form network cracks and induce shallow landslide under the action of dry wet cycle. In addition, the effect of gentle slope and skeleton on Diatomite slope is better.
Abstract: This paper takes the newly built railway passing through the diatom land area of Shengzhou and Xinchang in Zhejiang Province as an example. And based on the field test of soil samples, this paper pointed out that due to low natural density, large void ratio, high water content, dry shrinkage and wet expansion, relative deformation and strength, The...
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