Advanced Materials Research Vols. 605-607

Abstract: In order to study the structure random vibration analysis technology that material properties and temperature should be considered. We have developed a set of structure random vibration parameter engineering analysis tools that under thermal environment conditions. This paper, mainly introduces this software’s architecture, development process and function characteristics. This software is developed based on NASTRAN. User not only can establish a ball cone column finite element model according to actual demand but also can select model’s material properties. At last, we have an example dealt with this software. The analysis results of temperature field, stress modal and random vibration are in good effect. And reached the anticipate design goals of this software

Abstract: The large pendulum is a new kind of amusement devices. Virtual modeling and dynamic simulation based on virtual prototyping technology have been done for the structure analysis of the large pendulum. The speed, acceleration and load curves for each component on the large pendulum under different operation conditions have been acquired, which provides a reliable basis for further strength and security analysis. The result shows that the virtual prototype and dynamic simulation is an effective way to enhance the design reliability of the large pendulum.

Abstract: The method to precise control the motion of basic virtual prototyping technology (VPT) is put forward in this paper. The hydraulic die forging hammer structure, work principle, and the VPT design idea are introduced. The parametric solid parts model and entire assembly model are all designed based on solidworks software. The dynamic state simulation process of hammer is carried on. The result indicated that the dynamic process parameter of hammer was gained. The dynamic state working process of hydraulic die forging hammer is precisely controlled, which provides the foundation to further realize the numerical controlled and flexible of hydraulic die forging hammer.

Abstract: The main duty of this paper is dynamic performance research of reciprocating compressor value. By theoretical analysis, obtaining the movement rules curves of value plate and analyzing selection principle of value characteristics parameters; By mathematical simulation, expounding initial conditions and boundary conditions.

Abstract: As the upper frame is an essential supporting structure of Hydraulic Excavator, dynamic characteristics of the structure are particularly important. The finite element model of the upper frame is established by the finite element analysis software, and then modal analysis is carried out in absolute freeness. The former fifteen modes are adopted to review its inherent frequencies and vibration modes seriously, and the dynamic characteristics of the frame are clear. Analysis result indicates that there are some weak links in the structure, and suggestions of modification are put forward for the further structure improvement.

Abstract: This paper is carried out the analysis on structure stress characteristics of the top and low slewing frame of ST6020 tower crane, and gets the stress contours under different working conditions. According to the stress state of the structure and the adjustments of the structure scheme, rational structure of the top and low slewing frame is obtained.

Abstract: Based on the inverted triangle cargo boom of ST80238 tower crane as the research object, the author took its local down chord as calculation model. ANSYS software is applied to impose the constraints and loads on the model, and the stress and deflection are analyzed. The results show that the top flange of the down chord and the web will be influenced by the axial force of the oblique truss, and larger local stress in the joint position and the surrounding of the oblique truss and the down chord are produced, as well as the largest local stress will be produced in the centre of the connective position, and reducing gradually to the surrounding. In the condition of the box section center line of the down chord is constant, moreover the size of the down flange and the web is increased, and the local stress and vertical deflection nearby the joint of the oblique truss and the down chord will be reduced. Though the research, the local instability of down chord of ST80238 tower crane can be prevented,and a direct reference and basis for box beam of down chord can be provided.

Abstract: The power performance and fuel economy could be improved by increasing the shift. The 01N automatic transmission was a Navgneaus planetary gear mechanism with four forward gears, and the 6-speed transmission scheme was achieved by the planetary in series with the Navgneaus planetary gear mechanism. The original lever method was expanded for its limitation, the 6-speed transmission mechanism can be analyzed perfectly by the expanded lever method. The lever method was validated accurate and feasible.

Abstract: Variable head sizes of paper roll will influence the stability of paper feeding device and hence the printing quality. Therefore, it is necessary to improve the printing quality by improving the stability of paper feeding device based on dynamic analysis on the phenomenon of variable head sizes of paper roll. It is found through dynamic analysis that the effect of variable head sizes on the support force of bearings is nearly five times that of the case when such effect does not exist. Vibration performance analysis of paper feeding device using finite element analysis obtains the natural frequencies of the first 6 orders for paper carriage and their dominant vibrational modes. This provides theoretical basis for the improvement of paper feeding device.

Abstract: Based on the multi-body dynamics theory, a rigid-flexible coupling dual-link suspension model is established. Belgium road motivate inputs gathered from a proving ground are imposed on both wheels through a suspension-test rig and then a simulation is carried out. Next, the model is verified and refined by the available field test results of rear axle vertical acceleration. At last, based on the validated suspension dynamic model, a comprehensive dynamic load simulation is performed and different kinds of load form of suspension components are analyzed. This research could provide reference for measure point selection of load spectrum acquisition.