Design of Steering Trapezoidal Mechanism for FSC Racing Base on Matlab

2013 ◽  
Vol 647 ◽  
pp. 885-890
Author(s):  
Chang Zheng Shi ◽  
Zhong Xiu Shi ◽  
Tian Tian Wang
Keyword(s):  
Service Life ◽  
Steering System ◽  
Analytic Method ◽  
Matlab Software ◽  
The Road ◽  
Relationship Of ◽  
The Relationship

The design of steering trapezoidal mechanism is one of the important aspects of the vehicle steering system. Every parameterin steering trapezoidal has significant influences on the steering performance, stability and tire service life of the vehicle.Based on the analysis of the relationship of the inside and outside wheel angle by analytic method, Matlab software can be used to design FSC racing steering trapezoidal mechanism. Considering the conditions of the automobile race,the corresponding parameter of the steering trapezoid is designed to make the relationship of the l wheel angle close to Ackermann geometry relationship, which reduces the wear of tires, ensuring good steering performance and holding the road so well.

The Influence of Different Asphalt on the Comprehensive Performance of ATB Mixture

2015 ◽  
Vol 744-746 ◽  
pp. 1527-1530
Author(s):  
Fang Rui ◽  
Lei Hua
Keyword(s):  
Design Method ◽  
Low Grade ◽  
Modified Asphalt ◽  
The Road ◽  
Stability Performance ◽  
Temperature Performance ◽  
Higher Temperature ◽  
Relationship Of ◽  
Sbs Modified Asphalt ◽  
The Relationship

By comparing the study of 50# and 70# matrix asphalt and SBS modified asphalt to the influence law of high temperature performance, low temperature performance and water stability performance of ATB mixture, it can balance the relationship of the performance of every road in design method of ATB mixture. It suggests that we can use SBS modified asphalt in the condition of usually, use Low grade matrix asphalt or SBS modified asphalt in the condition of higher temperature requirements for the road , and use High grade matrix asphalt or SBS modified asphalt in the condition of the road in cold region.

Road-Related Air Pollution Health Risk Assessment and Economic Evaluation

2012 ◽  
Vol 610-613 ◽  
pp. 624-629
Author(s):  
Xiao Chun Qin ◽  
Bo Chang Dong ◽  
Yi Shen ◽  
She Gang Shao
Keyword(s):  
Risk Assessment ◽  
Air Pollution ◽  
Economic Evaluation ◽  
Health Risk ◽  
Health Risk Assessment ◽  
The Road ◽  
On The Road ◽  
Relationship Of ◽  
The Relationship ◽  
Variation Rule

60%~70% of air pollutants are vehicle emissions. With the soaring increasing of Vehicle Population, automobile exhaust is becoming the leading cause of air pollution. In this paper space-time variation rule of road-related atmospheric pollution is analyzed based on the characteristics of air pollution on the road. And the basic methods of road-related air pollution health risk assessment are determined in the analysis of the relationship of road-related air pollution and health. The economic evaluation of road-related air pollution is also made which would provide the methods for reference in the related research on road air pollution.

Origin of Tire Squeal. II. Tire Squeal Calculation from Materials Properties

1968 ◽  
Vol 41 (4) ◽  
pp. 953-976 ◽  
Author(s):  
N. M. Trivisonno ◽  
J. R. Beatty ◽  
R. F. Miller
Keyword(s):  
Dynamic Modulus ◽  
Relaxation Oscillation ◽  
Equation Of Motion ◽  
Sliding Velocity ◽  
Materials Properties ◽  
Velocity Amplitude ◽  
The Road ◽  
Frictional Properties ◽  
Relationship Of ◽  
The Relationship

Abstract In the first paper of this series, the origin of tire squeal was studied with reference to the location of the vibrating elements and the measurement of their motion. This paper approaches the problem of the relationship of materials properties to tire squeal. A simplified picture of tire squeal leads to the equation of motion of a vibrating tread element. The squeal theory, which takes into account hardness and resilience as measured by dynamic modulus and loss tangent of the material at the squeal frequency, and also the frictional properties of the tread compound as a function of sliding velocity, treats tire squeal as a relaxation oscillation of the tread in shear. The theory determines a squeal trajectory under any given conditions by solving the equation of motion for the sliding tread in contact with the road. The squeal trajectory gives the frequency, displacement amplitude, and velocity amplitude of the squeal oscillation. The simplified theory was checked by a comparison of theoretical and experimentally measured squeal frequencies and intensities on fifteen different tread compounds with widely varying physical properties. It was shown that tire squeal intensity depends primarily on hardness of the tread compound, with harder compounds squealing more. Yerzley resilience has a lesser effect, lower resilience compounds tending to squeal less.

Study on the Influence of Different Supporting Point Stiffness on External Suspension Tower Crane and Supporting Structure

2014 ◽  
Vol 1025-1026 ◽  
pp. 991-996
Author(s):  
Ji Man Luo ◽  
Yue Liu ◽  
Bin Li ◽  
Xiao Wei Sun
Keyword(s):  
Horizontal Displacement ◽  
Structural Mechanics ◽  
Matlab Software ◽  
Supporting Structure ◽  
Tower Crane ◽  
Supporting Point ◽  
Lower Beam ◽  
Key Factor ◽  
Relationship Of ◽  
The Relationship

Supporting system of external suspension tower crane is the key factor which impairs the safety of the tower cranes. In this article, the problem is studied about the influence of different supporting point stiffness on the force of the tower crane external suspension. Based on the structural mechanics theory, the displacement of the lower statically indeterminate beam and the horizontal displacement of the upper statically indeterminate truss are solved firstly, then the stiffness of the supporting point on the lower beam and the entirety stiffness of the upper horizontal combination struts can be obtained. We can get the optimal supporting structure by drawing the relationship of stiffness1-stiffness2-force which is of significant to the external suspension’s design and installation in Matlab software.

Religion and Politics in Contemporary Africa

2019 ◽  
Author(s):  
Jeffrey Haynes
Keyword(s):  
Political Change ◽  
Democratic Republic Of Congo ◽  
Religion And Politics ◽  
Religious Leaders ◽  
The Road ◽  
Road Map ◽  
Islamic Militancy ◽  
Congo Brazzaville ◽  
Relationship Of ◽  
The Relationship

This entry examines the relationship of religion and politics in Africa in the context of Democratization over time, with particular focus on the roles of religious leaders. Two main issues form its focus. The first is the relationship of senior religious figures to the state in Africa and the role of the former in the region’s recent attempts to democratize in the 1980s and 1990s. The second aim is to examine a more recent development: Islamic militancy in Africa in the 2000s, and its relationship with politics, political change, and democratization. During the 1980s and 1990s Africa experienced something it had not seen for decades: widespread popular calls for democratization, part of a wider package of demands for improved economic and political, including human, rights. Demands for democratization had both domestic and external roots. Domestically, demands for reform reflected an awakening—or reawakening—of an often long dormant political voice for various civil society groups, with trade union officials, higher education students, businesspeople, civil servants, and religious (mostly Christian) figures initially leading and coordinating popular demands for reform. Professional politicians later made such demands integral parts of their programs for election. The widespread expectation was that popular efforts would force long-entrenched, often venal governments from office. A second factor was that Africa’s democratization was the ‘road map’ for political change preferred by key external actors: Western governments who provided Africa with the bulk of its foreign aid. In sum, demands for democratization in Africa in the 1980s and 1990s are best explained through the interaction of domestic and international factors, with the former of most importance. During the 1980s and 1990s, religious figures, notably Christian leaders, added their voices to the clamor for fundamental political changes in Africa. Leading Catholics were frequently involved in national conferences on the political way forward in a number of French-speaking, mainly Christian, countries, including Congo-Brazzaville, Togo, Gabon, Zaire (now Democratic Republic of Congo), and Chad. In addition, in South Africa, apartheid rule came to an end in 1994 and a democratically elected government followed. And in Muslim-majority Niger and Mali new political leaders and democratically elected governments emerged. In sum, during the 1980s and 1990s involvement of religious leaders, including Catholic leaders in national democracy conferences and other means of democratization, reflected the fact that many religious figures became convinced of the need for democratically elected government in Africa.

scholarly journals SECURITY AND PEACE IN LATIN AMERICAN COUNTRIES

2017 ◽  
Vol 8 (3) ◽  
pp. 129
Author(s):  
Paulo Gustavo Da Silva ◽  
Arnoldo Jose De Hoyos Guevara ◽  
Nilson Gonçalves Pereira Baptista ◽  
Lilian Cordeiro Praes
Keyword(s):  
Latin America ◽  
Latin American ◽  
The Road ◽  
Two Factors ◽  
Historical Relationship ◽  
The Difference ◽  
Historical Trajectory ◽  
Relationship Of ◽  
The Relationship ◽  
Latin American Countries

This work aims to analyze the relationship between security and peace and their present conditions in Latin America, based on the research of these issues in international publications in various media and data collection indicators available in studies with statistical reliability. There is also the goal of obtaining a set of indicators in the light of existing jobs and new contributions that may show the “state” of present Security and Peace conditions in Latin America and infer about the future of such conditions, with a view to proposing actions between and within countries of the region. The Security-Peace binomial presents us with a fundamental question regarding the relationship of cause and effect - the safety results from the peace or peace is a consequence of security? Independent-minded succeed or not answer this question we have to consider that the two factors have impacts on the wellness of the human being. Equal opportunities and valuing life are fundamental principles that pave the road to full citizenship in Latin America, and without which it won´t make sense any attempt to try to achieve security and peace. The Security Commission Hemispheric of the Organization of American States Permanent Council emphasizes in a recent meeting (March 2000) that among the premises for reformulation of the hemisphere’s security concept are “the need to recognize the close links between security, development and consolidation of democracy as well as the historical relationship between peace and democracy”. We are hence at a very special moment of our historical trajectory, where notorious disrespect for human rights are a frequent threat to populations of Latin American countries. Initiatives to education, focusing on children and youth, with heavy use of art and science, may make all the difference and create today a future of peace and security, based on fraternity among all peoples.

A Study of Relationship Between Residual Asphalt in Aggregate Surface and Aging Degree of its Asphalt

2012 ◽  
Vol 602-604 ◽  
pp. 985-989
Author(s):  
Wen Tsung Liu ◽  
Ming Ho Tu
Keyword(s):  
Asphalt Concrete ◽  
Coarse Aggregate ◽  
Soxhlet Extraction ◽  
Recycled Asphalt ◽  
Recycled Materials ◽  
The Road ◽  
Coarse Aggregates ◽  
Processing Techniques ◽  
Relationship Of ◽  
The Relationship

Abstract. Laying the road, a lot of asphalt mixing plants use recycled asphalt concrete instead of fresh asphalt concrete. The main reason is that the plants don’t need to provide the viscosity inspection when testing because it is not mentioned in the contract. Even if the value of bitumen viscosity is high in the test report, it is difficult to prove effectively whether to join the asphalt recycled materials or not. This study is to explore the relationship between their extraction of bitumen and coarse aggregate cleanliness by Soxhlet extraction from asphalt recycled materials and fresh asphalt concrete. Besides, we look for the differences after washing asphalt. The research focuses on the method to view the number of the cleanliness on the coarse aggregate surface. The coarse aggregates will be divided into four kinds of sieve (3/4 ", 1/2", 3/8 ", # 4) in process. The selected range is by the built-in program of Photoshop_CS3. We determined the percentage of asphalt area on the aggregates in line with the RGB values. We further used the image processing techniques (Matlab program of image analysis) to assess the relationship of the above mention and compared the basic properties of the asphalt.

scholarly journals Response of Reeves’s Pheasants Distribution to Human Infrastructure in the Dabie Mountains over the Last 20 Years

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 2037
Author(s):  
Shan Tian ◽  
Jiliang Xu ◽  
Jianqiang Li ◽  
Mingxiang Zhang ◽  
Yong Wang
Keyword(s):  
Endangered Species ◽  
Indirect Evidence ◽  
Dabie Mountains ◽  
Infrastructure Development ◽  
Negative Effects ◽  
The Road ◽  
The Past ◽  
Line Transects ◽  
Relationship Of ◽  
The Relationship

Human infrastructure development drives habitat loss and fragmentation worldwide. In China, over the last 20 years, rapid infrastructure development impacted the habitats of endangered species. To facilitate conservation efforts, studies of how human infrastructure affects the distribution of Reeves’s pheasant (Syrmaticus reevesii), an endangered species by the International Union for Conservation of Nature (IUCN) and a nationally protected species in China, are critically needed. We assessed how the distribution of Reeves’s pheasant was impacted by human infrastructure development over the past 20 years in the Dabie Mountains, the main distribution range of the species. We surveyed Reeves’s pheasants by direct sightings and indirect evidence through line transects which were randomly distributed in the Dabie Mountains from 2001 to 2002 and 2018 to 2019. We evaluated the variation of the roads and buildings in these areas in the last 20 years, and then modeled the relationship of the distribution of this pheasant with the road and building data from 2000 and 2017. Human infrastructure became more extensively distributed throughout the Dabie Mountains during the period, with all lands within 10 km of a road or a building. The distribution of Reeves’s pheasants became closer to the buildings and roads and there was a significantly positive relationship between the occurrence of Reeves’s pheasants and the distance to the nearest buildings and roads in 2018–2019. These results suggest that the increased density of buildings and roads in the Dabie Mountains may have caused negative effects on Reeves’s pheasants.

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