Applied Mechanics and Materials Vol. 387

Abstract: In this paper, we did research on the control theory of vehicle`s steering and braking systems. We used T-S fuzzy method to design the nonlinear model which is based on the vehicle`s steering and braking models. Then a cooperative controller was designed to coordinate the steering system and the braking system. On this way can effectively enhance the vehicle`s braking performance and steering stability. Finally, the results of simulation prove that the designed system has a satisfying tracking performance and strong system robust in diversified driving conditions.

Abstract: The mechanical seal bench is the test platform for the leakage of the mechanical seal.The mechanical sealing leaking are closely related to the fluid pressure and temperature.The control system of the fluid pressure and temperature be designed to meet the needs of mechanical seals working in defferent conditions and the system of the leakage data acquisition and processing are designed based on C51 and C++BUILDER. The data collected be output on curve fitting.The test stand is certain guiding significance for the design and testing of the mechanical seal.

Abstract: Abstract: the vector control of asynchronous motor variable frequency speed regulating system is a high performance control system, has been used in many high precision, high performance applications applications. In vector transform based many control methods, such as the speed sensorless control and adaptive control, is the development of. In the MATLAB environment, the control of slip frequency vector control system simulation, the simulation experiment shows the fuzzy control simulation results superior to the traditional PI control.

Abstract: Making use of orthogonal experiment design method samples on muffler element with perforated plate are fixed, and a model of total sound power of flow regeneration noise and flow velocity, perforated diameter, expansion ratio, perforated ratio and length of perforated plate to inlet expansion is established, and the model parameters are solved, and quantity research of the noise effect is performed, and spectrum characteristic of flow regeneration noise from the muffler element is analyzed. It is achieved that the perforated diameter and the expansion ratio have important effect on flow regeneration noise, the reducing of the perforated diameter and improving expansion ratio is in favor of the reduction of flow regeneration noise from muffler element with perforated plate, and peak value frequency appears in the middle and high range, and the high frequency may be high velocity air flowing through little holes on the plate.

Abstract: The primary aim of research is to improve the speed of underwater glider to overcome the influence of ocean currents. In the paper, an autonomous underwater glider with pump was developed, and its vertical plane motion equations were established. In addition, the glider’s vertical plane motions were simulated. The results show, compared with no thrust, when the amount of volume change is 0.8L and the pump jet thrust is 15N, the glider’s resultant velocity and its horizontal velocity are double. When the pump thrust increases to 40N, the glider’s resultant velocity and its horizontal velocity are triple. It has also been confirmed that there is a best neutral buoyant pitch angle that can make the glider’s horizontal velocity reach the maximum in a different amount of volume change.

Abstract: This paper uses three-dimensional dynamical simulation of gas jet to demonstrate basic deflecting features of the double-faced deflector, during the launch process of the land-based missile with the vehicle-mounted vertically thermal launch. The calculation shows that the deflection of the gas flow is good, reducing knock-on effect and ablative effect on launch device. But wheels of the launch vehicle are still under visible influent from the gas flow. The paper optimizes the double-faced deflector and compares different suggestions in order to find a better deflection.

Abstract: The erection construction technology of steel tower of overhead transmission line using helicopter has higher requirements to the butt auxiliary device. According to the GE1 steel tower of the QingZang AC/DC interconnection project Geermu converter station earthling line, the butt auxiliary device is developed. The butt auxiliary device includes a guiding device, horizontal-direction caging device and vertical-direction caging device and solve the problems as follows limiting in air, docking, perching and temporary supporting. The successful engineering application show that the butt auxiliary device is safety and reliable and has perfect function, simple structure and convenient installing and removing. This provides reference for the design of the butt auxiliary device to other types steel tower of transmission line.

Abstract: Structure parameters of work piece on muffler unit with simple expansion are determined using orthogonal experiment design method, and relationship model of total sound power of flow regenerated noise and flow velocity structure parameters is built, and the model parameters are solved, and quantity study of effect factors for the noise is performed. Results show that inlet diameter and expansion cavity length have high effect on flow regeneration noise, the reducing of the inlet diameter and improving expansion cavity length is in favor of the reduction of flow regeneration noise from muffler unit with simple expansion, and expansion ratio has less influence on the noise, the reducing of the expansion ratio makes the regenerated noise become less down.

Abstract: In order to more accurately estimate the intrinsic mode of herringbone gear transmission box, fluid-structure interaction model of gear box and lubricants is established. Gear system natural frequencies and mode shapes is calculate out on the establishment of the fluid-solid coupling dynamics equations. The finite element models of gearbox and lubricating oil are build by ANSYS software, and the results of inherent characteristics are given. The top ten order natural frequency is distributed between 611.8HZ and 2487HZ, and the first two order mode shape is respectively shown as the axial swing and horizontal swing. In order to verify the analysis results, the hammering method of single-input multiple-output (SIMO) is used to test gearbox structure modal. The results show that the mode shapes get from ANSYS analysis are consistent with the datas of experimental measurements, and the maximum deviation of natural frequency between experiment and theory is blew 15%. So it can be shown the fluid-structure interaction model in this paper is effective and reasonable.

Abstract: Electromechanical system is the main auxiliary system for expressway traffic facilities and the main tool to implement modern management. In this paper electrical safety performance and environmental adaptation performance were introduced first. Then highway external field electromechanical equipments were recommended. This may give some references to electrical and mechanical equipment design, production and construction.