Advanced Materials Research Vols. 889-890

Abstract: Taking a type excavator as an example, three-dimensional model was established using CATIA software, using the ADAMS software to the dynamic simulation analysis; get the movable arm hinged point load curve. The maximum load into ANSYS finite element analysis was carried out on the derrick structure, derived from ANSYS MNF file imports ADAMS to get the coupled model and dynamics analysis, get the time-varying curve working device. Results show that the coupled model is more in line with the actual, work can be more fairly reflect device performance, can provide the basis for further optimization of the structure of excavator.

Abstract: This paper introduces the structural principle of a new offset radial type motor. Through analyzing the kinematic characteristics of the motor piston theory, the result shows that the motor has characteristics of good startup performance at low speed, good sliding performance with sliding boots, smooth operation, low noise and so on, so the performance is superior to the general motor of low speed and high torque. Besides, comparing with other types of hydraulic motor, its lifetime increases and it is also easier to produce and repair. Moreover, beside the use of common hydraulic system, it can also be used in pure water hydraulic system under certain conditions.

Abstract: Topology optimization design is to ensure the normal functioning of the machine, remove the invalid element structure makes the best structure to maintain the structure and keep the stress or strain level close to the same in each part of the security configuration, the pursuit of the best efficiency, lightest weight , smallest, or the longest service life and so on. Traditional structural optimization design one or several parameters set as the primary determination. This method only to the extent required. With the development and analysis of the efficiency of the computer, we have introduced in the design of finite element analysis. This article uses the basic evolutionary structural optimization method In this paper, load the hub topology optimization analysis of different groups.

Abstract: With the help of CDV internal-combustion engine start process test in the low temperature, it was investigated and analysed for the effects of the intake advance angle of gas distribution phase in the low temperature start and its exhaust-emission performance of internal-combustion engine. In the process of test ,the intake-advance angle change was from 1 °- 11 °and the valve overlap angle change was from 38 ° - 48 °. The internal-combustion engine was started according to the test number of the requirements. It was observed and calculated for starting conditions and exhaust emission with PC. The results show that the appropriate delay of intake valve open timing, and hence the change of valve timing overlap of the intake valve and exhaust valve, and the proper decrease of in-cylinder fresh intake gas, not only significantly improve the performance of internal combustion engine low temperature start combustion work, shortening start duration, but also help to reduce the quantities of HC and CO emissions during the low temperature start process.

Abstract: The braking signal transmitter is a major component of the EBS. The structure and working principle of a braking signal transmitter were introduced. The test bed of the braking signal transmitter was designed and built. The static characteristics of the braking signal transmitter were obtained by analyzing the test data. The inflection points and the slope of each segment curve obtained by the bed test are basically identical to the static characteristic calibration curve. The pressure does not reach the maximum pressure of the static characteristic calibration curve because the gas source pressure does not reach the required test pressure. Keywords: Braking signal transmitter, EBS, static characteristics, bed test.

Abstract: Climbing stairs is one of the important functions of the articulated-tracked robot obstacle, the robot can be improved through the complex terrain capability. The robot is conducted action planning for climbing stair. Action planning of the robot, speed and acceleration of position change of the robot's center of mass, moment of inertia of driving wheels and arm wheels for influence of the robot dynamic feature are considered, complex dynamic models of the robot to climb stairs are built. The relationships of driving wheel torque, arm wheel torque and its different speed, acceleration, staircases height, angle of the robot and the stairs are analyzed by simulations, maximum driving torques of driving wheel and arm wheel are obtained in the process of robot climbing stairs, a theoretical basis for articulated-tracked robot selecting the appropriate driving torque and motion control are provided.

Abstract: Driving processes and characteristics are different between the water hydraulic artificial muscle and pneumatic artificial muscle due to the difference of work media employed in muscles. An appropriative hydraulic circuit was designed to control the pressure of the water hydraulic artificial muscle and the performance of this system was analyzed. An AMESim model of the control system was built and the dynamic characteristics are analyzed with various parameters of the hydraulic circuit and various loads by simulation. The results show that the performance of the water hydraulic control valve should agree with the dimension of the water hydraulic artificial muscle. The rated flow rate of the water hydraulic valves can be selected increasingly while the load mass is low. Meanwhile, the overshoot is generated and enlarged along with the increases of the flow rate and load mass. These contribute to the improvements of designs and researches on control systems of water hydraulic artificial muscles.

Abstract: According to the process performance of cigarette machines system, the device was established to measure the stability of pneumatic cut tobacco feeding system, which was signified as the flow deviation coefficients of branch circuits. The state and process of pneumatic feeding system were simulated respectively by shutting one branch, and then it paid close attention to the changing of flow rates or velocities in other branch circuits. The flow deviation coefficients were calculated with the experimental data, and the results shown that shutting down one branch, the flow deviation coefficients of other branches is always below 12%.The results will do some benefits to the design of cut tobacco pneumatic conveying system in the engineering application.

Abstract: For conductor commonly used in power project, research was conducted on its ice accretion and aerodynamic characteristics. Ice mass and ice shape were examined under various icing condition: time, temperature and wind speed. Ice mass increases linearly with time, while the growth rate varies significantly with wind speed. Ice mass does not increase with the fall of temperature; it reaches the max value in a relatively high temperature range of-5°C~-10°C. Ice shape and ice thickness are both important factors that determine conductors aerodynamic characteristics. Sudden increase of lift coefficient may happen at low attack angle for conductor with thick crescent ice shape.

Abstract: CNG is thought to be one of the most promising alternatives to traditional fuels. The multi-fuel ability is another characteristic of the FPE. The piston motion can be controlled to have beneficial effects on the engine performance. This article investigates the effect of piston motion on combustion of four-stroke CNG FPE using a multidimensional simulation model. It is found that the high piston acceleration and velocity at top dead center increases expansion ratio and fasting combustion, reduces the heat transfer losses and decreased NOx emissions formation. At the same time, the turbulent kinetic energy of the gas during the combustion process is added.