Advanced Materials Research Vol. 823

Abstract: To solve problems of the traditional feed brace in single reflector compact antenna test rang, such as difficulty in position adjustment and the feed polarization manual switching, mechanical structure and position adjustment mechanism of feed brace system are designed, based on principle of feed positioning. The new feed brace system weight is lightened with same intensity. Function of precision rotation around axis of feed horn is realized. Control system software is developed. Two control modes, onsite and remote, are provided. Laser tracker is used to locate feed phase center in high-precision when feed brace system is installed on site. The new feed brace system has been applied in some single reflector compact antenna test range and its precision meets the requirements.

Abstract: Aiming at the difficulties in diagnosis for low speed and heavy duty components of furnace top gearbox, an indirect diagnosis method for vibration signal is proposed in this subject, through which the vibration features of high speed rotating parts that near input end of gearbox is effectively utilized and analyzed for fault judgment of low speed components and a useful methodology is also given for fault diagnosis of both furnace top gearbox and low speed and heavy duty equipments. Since the identification for all faults and accurate fault location cannot be realized by using the existing diagnosis methods, a method of vibration analysis for fault diagnosis to furnace top gearbox is presented to realize accurate judgment and fault location. It can be found out that if near the basic frequency and double frequency of characteristic frequency of high speed components of upper gearbox, there were frequency spacing of fault characteristic frequency of low speed components of subordinate transmission chain apparently showing up, which also happened in low frequency range after demodulation, then the fault location can be determined to the low speed parts of subordinate transmission chain.

Abstract: Based on the way of parametric design with SolidWorks, The 3D model of Whole welding type forged steel ball valve is established, Based on SolidWorks Flow Simulation, the simulation dynamic characteristics of ball valve was analyzed, By studying the ball hole edge radius R, Pointed out the direction for the design, through the simulation calculation of target parameters, analyzing the rationality of the structure of the sphere, to optimize the structure of ball valve, shorten the design cycle, and improve design quality. The simulation results are helpful to design improvement. The result indicates that the method is advanced and feasible. It has better practicability.

Abstract: Temperature test was very important for product development and quality control of cigarette industry. However, gas temperature test inside cigarette was very difficult and time-consuming due to small volume of cigarette and lack of proper fixing device of temperature probe. In present paper, a fixing device for temperature test of cigarette was designed and developed. Thermal couple was well fixed by present device and can be inserted into the cigarette conveniently and quickly. Precision of location and depth of insertion was 0.002mm. Repeatability of parallel experiment was ensured. Test efficiency of temperature field was improved. Automaticity of temperature test was enhanced. With the increasing demand on gas temperature test inside cigarette, present fixing device will have good commercial prospect in market place.

Abstract: On the basis of the analysis of the problems existing in the current research on gear reducer structure, using Solidworks to reducer box structure finite element analysis, by changing the angle of the rib plate and rib plate thickness, the size of the box thickness and the thickness of the bottom plate, based on a comparative study on the experimental data, the comprehensive analysis of the change of the stress and displacement, enclosure structure stress and deformation with the change of size of box body, and eventually make the reducer box to achieve optimization of the structure, lightweight design for the reducer box to explore effective ways and means, has a certain practical significance. Keywords: Solidworks;Finite Element Analysis;Gear Reducer Box;Lightweight;

Abstract: A self-propelled, cable-controlled vehicle is a self-propelled types ROV with a cable, its movement patterns underwater is significantly influenced by the tension of the cable. The paper analyses different force models of cable elements, provides a basis for correct usage of differential equation system in cable tension calculation, and puts forward a quick and accurate way to calculate the cable tension of self-propelled, cable-controlled vehicles.

Abstract: In order to get the displacement response curve of the Gantry Crane Girder under three stage of lifting process, the vibration differential equation and displacement response expression were deduced, combining with the actual case, the displacement response expression and displacement response curve were deduced in the load duration time 0.8 s and 0.2 s. The results show that: the lifting process is an important factor affecting the structural vibration; Displacement peak and load duration time are inversely proportional; Increase the load duration time can reduce the vibration of the structure.

Abstract: Throttling area not only determines flow rate but also influences behavior of a valve. And, the throttling area ( also called smallest area ) is a very important factor required to design carefully. Unfortunately, the throttling area is always difficult to determine because of relatively complex structure, and the pure study for throttling area is published barely although there are also some existing formulas. For getting more suitable models that are not sensitive to the displacement of spool and cone angle, this paper carries out comparison for different principles, and finally finds that the projective area based on annular area is the best one for the cone valve. During this process, this paper shows a set of mathematic models, simulation and test results, which ensures a successful design for a valve mentioned in the paper and brings a universal model for throttling area of cone valve.

Abstract: The multi-body dynamics model with rigid-flexible integration of the mechanicalhydraulic governor of diesel was set up based on the theory of computational dynamics of multi-body system. The initial conditions and boundary conditions were analyzed and added correctly to the components of the model. Then the working process of the mechanicalhydraulic governor was simulated, and the dynamic characteristics were analyzed. The results show that the model and the solving process are correct and credible. These pave the way for the further study about structure and capability optimum of the speed governing system. The whole analysis process provides a simple and feasible approach which can be used in other mechanical and hydraulic system.