Advanced Materials Research Vols. 199-200

Abstract: To reduce the cost and the time of transport in Eurasian railroad networks such as TKR(Trans-Korea Railway), TCR(Trans-China Railway) and TSR(Trans-Siberia Railway) owing to the problem of different track gauges (narrow/standard/broad gauge), it is important to develop the gauge-adjustable wheelset (GAW) system to adapt easily to these gauges. The GAW system in the transcontinental railway represents a more effective way in comparison with other techniques for overcoming difference in track gauges. Freight trains having the GAW system will be passing various curved tracks in railroad networks. In this study, it was performed to evaluate contact stress and fatigue life of locking parts during freight trains' service in the curved track, respectively. Moreover, the safety of Korean GAW system at running track was verified by rig tests according to UIC 510-4 code.

Abstract: In the current pin clamping device of bottle blowing machines, the design datum can’t coincide with mold datum. So it not only needs a pressure compensation device, but requires clamping holes to meet high precision. It makes the clamping device manufacturing and maintenance cost high. On the other hand, the producing plastic bottles have obvious mold lines. It affects products quality. For the above shortcomings, this paper designs a wedge clamping device, and then analyzes the kinematics modeling of planar moving cam mechanism and plane linkage mechanism. The results show that the device has smooth operation and small impact. So the new wedge device can meet the job requirements of high-speed rotary bottle blowing machines.

Abstract: Motions of natural creatures appear flexible and rhythmical characteristics. The bionic undulating propeller imitates undulating motion of a fish’s flexible long fin, and its propelling efficiencies are affected by bionic units’ characteristics. In order to improve the flexibilities of both structure and bionic motion, the paper designed a bionic undulating propeller driven by hydraulic system, and then carried out some modeling work on the rotatable direction valve. At last, some experiments are brought forward on a prototype of bionic undulating propeller. In the experiments, rotatable-direction-valve could control fluid flowing through all the oil orifices periodically and in sequence, so as to drive the bionic units swinging rhythmically. Under the control of rotatable-direction-valve, the prototype gains flexible starting and stopping processes, as well as self-resume character of bionic undulating wave, which are coincident to nature fish. The results show that application of hydraulic system in bionic undulating propeller is feasible, and theoretic model of rotatable direction valve is correct.

Abstract: A gear’s finite-element model has been set up according to the parameter functions of the involute and tooth root curve, single and double tooth meshing region have been obtained according to the results of contact analysis. A tooth root’s bending stress has been calculated when meshing in the ultimate position in single tooth meshing region, and this stress has been contrasted with the results of a classical method as the maximum of a circle. The results of theoretical method were far away from that of finite-element calculation before being modified and were a little larger than the later after being modified. Reasons leading to this difference have been analyzed.

Abstract: Epicyclical gear trains with three-degrees of freedom have found its wide application as the development of new technique. Currently, nearly all domestic researches on epicyclical gear trains with three or more degrees of freedom are aimed at the practical application, and scare works systematically investigate basic configuration and synthesis of the train system. An innovation synthesis method is proposed based on the compound joint kinematic chain and the substitution of low pair with high pair for epicyclical gear trains with three-degrees of freedom, and the possible independent basic configurations of epicyclical gear trains with three-degrees of freedom are obtained by applying the proposed method and the utilization of the method is also discussed. The method provides not only a new approach for innovation synthesis of epicyclical gear trains but also a few basic configurations of epicyclical gear trains with three-degrees of freedom for practice design.

Abstract: A novel worm wheel transmission error measurement system based on a new space-time subdivision technology is presented in this paper. Non-integer transmission ratio with high precision can be measured with this measurement system. FPGA chip is employed to meet the requirement of high precision and real-time, and USB2.0 meet the requirement of high speed data acquisition and real time data transmission. In addition, precision self-checking is studied with quantitative shifting method, and the experiment method on repeatability test and data processing are studied with dual-observation method. Experiment results prove that this measurement system has high precision and good repeatability.

Abstract: A new method on determining the dead zone of the bottom door mechanism is proposed in the premise of considering the friction. This method can ensure the bottom doors of the railway cars with the self-unloading coal hoppers to realize the prescriptive mechanical action accurately, timely, and coordinately. The effectiveness of the theoretical analysis results is verified by the computer simulation. This research provides the necessary theoretical reference not only for the application and maintenance of the existing bottom door mechanism, but also for the design, analysis and forecast of the new mechanism. It also lays the base for the motion reliability analysis of the mechanism.

Abstract: This work develops a dynamics analytical model for an idler gear system of a power turret to analyze its vibration modal frequencies and modes. The idler gear system has four gears and each gear of the idler gear system has been defined as a rigid body which has the two translational and one rotational freedom. An ADAMS simulation model for whole idler gear system is built also. The calculated result by the analytical model accord with the ADAMS model’s well.

Abstract: The mechanics models of electromechanical integrated toroidal drive in magnetic meshing between stator and planet or between worm and planet are established on the base of electromagnetic theory in this paper. Equivalent current model of permanent magnetic body of planet tooth is founded too. The calculated formulas for magnetic field force between stator and planet or between worm and planet are deduced. And the calculated formulas of output torque of electromechanical integrated toroidal drive are obtained too. The output torque of drive is calculated and analyzed, summarized the influence factors and regulars of output torque, which is the base of design.

Abstract: Influence of alignment errors on the meshing of involute spiral bevel gears using FEM is investigated in this paper. 3D geometrical models of involute spiral bevel gear drive are computationally designed and the reliable non-linear finite element contact models are also developed. Furthermore, based on the valid 3D FE models, simulations of meshing of loaded spiral bevel gears with four types of alignment errors are performed. The influence of four types of alignment errors on contact stress, transmission error and shift of path of contact has been discussed in detail. The results demonstrate that the alignment errors have different degrees of adverse effects on the load-carrying capacity and the smoothness of transmission. Therefore, the study provides useful reference for the modification design and the assembling of spiral bevel gears in practice.