Search results

A Research of In-car Navigation Monitoring System Terminal Based on the Green Path Planning JIN Zhi-yang1,2,a , JIANG Hao-bin2,b and WANG Ruo-chen2,c 1 College of Automotive and Traffic Engineering of Jiangsu University, Zhenjiang 2 College of Electrical and Mechanical Engineering in Hainan University, Haikou ajinzhiyang94@163.com, bjianghb@ujs.edu.cn, cwangruochen@ujs.edu.cn Keywords: green path planning, navigation monitoring, in-car terminal, energy saving and environmental protection Abstract.
It led directly to greatly reduce the speed of vehicles, increased fuel consumption, environmental pollution, declining in the efficiency of logistics system, affecting the effective operation of the economic and social, is not conducive to China's low-carbon economic and social system.
The green path planning is more complex, it is not only the road property, but also the driving environment more closely related to, not only with the performance of the vehicle itself is closely linked to, the travel period, this dynamic impact factor is also one of the very important factors.
Taking these factors together to determine the fuel consumption weights, build a green path planning model[4] and use a Dijkstra optimal path algorithm to complete the search of the green path, as shown in Fig. 1.
Considering The delay attribute table property sheet of the vehicle fuel consumption and the period property sheet to complete road network roads weight calibration of the green model, the required data table as described below: (1) road network node table the Node, storage node information; (2) road network arcs table Arc, storage arcs, the table reflects the topology of the road network; (3) Road property sheet Road, road attribute data storage; (4) the vehicle the property sheet Driving, expressed the vehicle parameters;( 5) circle delay property sheet CircleDelay, expressed road network node corresponding delay time; 6) vehicle fuel consumption attribute table VehicleFuel expressed the performance of the fuel consumption of the vehicle; (7) driving period the property sheet DrivingPeriod expressed with the time value; (8) real-time information RealTimeInfo, the storage characterization road closure plug real-time information.

While a large number of experiment show that the temperature field of Friction Stir Welding is a continuous dynamic process, the distribution of the temperature field directly affects the plastic flow of the weld metal, and then affecting the weld shaping and the mechanical properties of welded joints【2,3】.Especially, the problem is more prominent for welding the high melting point material such as the low carbon steel.Therefore, it is important for optimizing the welding process to study the low-carbon steel stir welding temperature field changes in the friction stir welding process.On the basis of theoretical analysis, using finite element software ANSYS simulate and analysis the temperature of entering into the quasi-steady in the friction stir weld process and the variation law of the feature point’s temperature.It will get the variation law of temperature in the the friction stir weld process,and thus lay the foundation for optimizing the welding process parameters and improve
We choose 200 mm x 80 mm x 4 mm of Q235 steel plates to do the docking experiment, and table 1 present the main chemical composition and physical property of the steel plates.
The high temperature region of the heat-affected zone is an elliptic, which presents small in the front and big in the behind.
This is because the surface of the weldment is affected by the shoulder of the stir head and the stir pin together.
[6] JunMing Zhao,Yu Wang,Xin Yin,Hui Zhang.TC4 Titanium alloy friction stir welding temperature field numerical simulation[J].Mechanical engineering material,2008,32(5):78-81.

Sulaiman1,d 1Department of Mechanical and Manufacturing Engineering Universiti Putra Malaysia 43400 Serdang, Selangor D.E.
Machinability is understood as a property of a material that allows for machined under given conditions.
The surface roughness was mostly affected by cutting speed [11].
Vibrational moulding during solidification process has a remarkable effect on the castings properties of metals, alloys, and composites [12].
Many factors affect the surface roughness of a machined part such as properties and constituents of workpiece material, tool geometry, and machine condition.

Characteristics of Hot Ductility and Fracture in Micro-Alloyed Q345B Structural Steel Fang Dong, Cheng Sua and Yuanyuan Bai Meterial and Metallurgy school ,Inner Mongolia university of Science and Technology,Inner Mongolia, Baotou, 014010, china aSlz851006@163.com Keyword: Microalloyed Steel; Fractography; High Temperature Mechanical Property Abstract.
Experimental method The composition of the tested V-Ti-Nb microalloyed steel is shown in table.1, tested specimes were machined to cylindrical samples with a diameter of and a height of , then electrically heated by using computer servo-controlled Gleeble-1500D thermal mechanical simulator to 1200°C at a heating rate of 20°C/s and then continuous heated to 1300°Cat a heating rate of 10°C/s, at this temperature point, the tested simple was homogenized for 120s to dissolve any precipitate, subsequently cooled at a cooling rate of 3°C/s which is close to the practical cooling intensity of secondary cooling zone of slab when it goes out of the mould to the deformation temperature, holding for 60s in order to eliminate the thermal gradient before deformation.
On the other hand, the factor of dynamic recrystallization that can be reflected by the true stress-strain curves also is important to affect the ductility, shown in fig 6, it is well known that the kinds of curves are generally divided into three categories: work harding,dynamic recovery and dynamic recrystallization, and dynamic recrystallization will improve the ductility by refining grain and prompting grain boundary migration[4].
(2) In region I which is close to the melting point that below the experimental temperature of 1300°C, the liquid phase causes the embrittlement, and ductility does not depend on the strain rate; In region II which corresponds to stable austenite region, embrittlement occures along grain boundaries as a result of intergranular precipitation, only in higher strain rate; In region III which covers temperatures of 900°C to 700°C, the ductility trough locate in 800°C, the degree of the embrittlement increases as the rate of deformation decrease, this embrittlement is caused by such factors as intergranular precipitation, formation of proeutectoid films along austenite grain boundaries, and grain boundary sliding

Structural Analysis and Optimization Design of the Frame of YC460LC-8 Excavator Guang Lin Shi1, a, Kun Wu2,b and Lin Zhu1,c 1Department of Mechanical Engineering, Guangxi University of Technology, China 2Department of Mechanical Engineering, Liuzhou College for Vocational Technology, China asgl8913@163.com, b21cdm@sohu.com, c603966620@qq.com Keywords: Hydraulic excavator; Frame; Finite element analysis; Optimization design Abstract: This paper based on a settled type of structure concerning hydraulic excavator rotary platform as the research object, use the method of finite element analysis to build the finite element model in the conditions of three typicals of representative working condition about this rotary platform.
Finite element analysis 2.1 Build the model Firstly, building the geometrical model in the PRO/E, simplify the small features like: the small round hole, little corner, which does not affect the strength performance of the structure[1], as the model is 1/2 symmetric structure,then in order to reduce the model calculation time, process the calculate by guide the 1/2 of the model to the Workbench, then define the contact relationship between each parts, finally use the method of 10 node and 3 degree of freedom entity unit solid187 to divide the gridding, the finite element model refer with Fig.1.
Fig.1 The frame structure's 1/2 finite element model Fig.2 The frame’s vertical working attitude Fig.3 The frame’s horizontal working attitude under the most dangerous working condition under the most dangerous working condition 2.2 Material's mechanical property The main material of the frame of YC460LC-8 excavator is Q345B, material's mechanics properties are shown in table 1.
Table 1 Q345B material's mechanics performance Material name Density (kg/mm^3) Elastic modulus (MPa) µ Yield strength (MPa) Intensity limitation (MPa) Q345B 7.85e-6 2.06e5 0.3 345 510-600 Safety factor can be ordinary selected from1.5 to 2 in the checking process of the working device's strength.
A practical designing method for the optimization of mechanical structure．Journal of Machine Design, 2003, 20(1): pp.41-43.

Referring to Al foundry, one factor affecting the fluidity of Al alloys is the pouring temperature.
The presence of oxides has a deep effect not only on mechanical properties but also on the material castability.
Fluidity is not exactly a single physical property, such as the density or viscosity, but a complex physical as well as technological property that depends on many factors.
Miodownik, Material properties for process simulation, Mater.
Ferraro, Effect of grain refinement and cooling rate on the microstructure and mechanical properties of secondary Al-Si-Cu alloys, J.

Combining the domestic and international development situation of space intelligent manufacturing, the application status quo and the demand and application model of China's future manned space field, it is very important to propose a development path suitable for China's technology and economic status. 1 Establish a material system suitable for space-in-orbit manufacturing Material properties are a key factor affecting the performance of additive manufacturing components, requiring the ability to systematically comb the inherent properties of space-printable materials, providing an original data foundation for the design and performance analysis of space-built components or structures.
This may be related to factors such as the aging of materials in space and the deviation of the printer's three-axis calibration values. 3 Space 3D printing development path analysis (1) Standard system construction In the American ASTM and ISO standards, the standards for additive manufacturing technology have been collated and stipulated.
New physical models need to be studied to predict the material properties of the additive manufacturing process and to help optimize the material composition.
An understanding of the basic physical properties of a material can establish a predictive model of material performance, enabling designers, engineers, and users to estimate the functional properties of the manufactured product during design to adjust the design to achieve the desired results.
At the same time, in the additive manufacturing, the axial or machine direction may generate thermal stress in the component, thereby affecting the manufacturing precision of the final product.

The issue of varied performance stems from a lack of understanding of CRMA and how the addition of crumb rubber influences the mechanical behavior of crumb rubber-asphalt binder mixtures.
The change in the elastic range with different loading frequencies could affect this performance significantly and would offer further insight into the behavior of CRMA.
This indicates that as a material, CRMA is fundamentally less susceptible to variations in its mechanical properties than conventional asphalt mixtures.
Li: Factors Affecting the Viscosity of Crumb Rubber–Modified Asphalt, Petroleum Science and Technology 28 (15), p. 1555-1566 (2010) [2] L.
Veeraragavan: Dynamic Mechanical Characterization of Asphalt Concrete Mixes with Modified Asphalt Binders, Materials Science and Engineering: A 528 (21), p. 6445-6454 (2011)

It is known that the properties of the constituent powders play an important role in determining the properties of the final part.
However, by consolidating powders of different constituents, a spectrum of new composites with unique properties is now possible.
Such composites are known to have, hitherto, unattainable mechanical, electrical and magnetic properties.
Lastly these materials can be produced to the desired densities in parts varying from low-density porous bearings to high-density structural and load carrying components with comparable mechanical properties to most known metallic materials [1].
The variable density in such products gives rise to distortion and uncontrolled residual stresses affecting the final quality of powder-based products [2].

The result shows that the width of the sealing surface and the contact stress altered with the change of structural parameters, which affected the sealing most.
So the leakage rate can be deduced as follows: (5) Considering the relationship between H and h is as follows: (6) where is the average stress on the sealing surface, is a sealing factor of the cone material.
So conclusion can be drawn that the seal property is the best when the cone angle is 24 degrees.
Mater Sci Eng, 2000,281(A):234-238 [3] Zhou Xin, Pang Hewei, Liu Hongyang, Mechanical Analysis and Verifying Test of Sealing Situation at Orbicular Seal Joint.
Journal of Astronautics, 2007(3):762-766 [6] Hang Chong, Zhang Yong, Research on sealing property of globe-cone joint for pipeline.