Applied Mechanics and Materials Vols. 635-637

Abstract: The residual vibration of cam curves is analyzed. The displacement of residual vibration is computed by Duhamel method. The comparison of the residual displacement between the flexible exponential cam curves, the modified constant velocity curves, the modified trapezoidal curves, and the modified sine curves is done. The residual vibration of the flexible exponential curves is smallest.

Abstract: The dynamic performance of suspensions plays direct role in vibration control of railway vehicles and also has great impact on the ride comfort and operation stability. For assessment of the influence, a method of sensitivity analysis was performed, in which a Multi-Body System (MBS) dynamic model for the HXN5 locomotive counting for significant DOFs and nonlinearities was developed in SIMPACK platform and validated by real tests. More than tens of dynamic simulations were performed by a variety of damping and stiffness coefficients of the primary and secondary suspensions. By simulation, it is found that the vertical stiffness and damping of the primary suspension have the most sensitive influence. The lateral stiffness of the primary suspension, the longitudinal and lateral stiffness as well as the longitudinal and vertical damper of the secondary suspension possess the least effect on the railway locomotive vibration characteristics. It is also shown parameters of the longitudinal stiffness of the primary suspension, the vertical stiffness and lateral damper of secondary suspensions are of intermediate influence.

Abstract: Dynamic characteristics of the structure have a significant effect on the performance of the structure. Modal test is a common method to obtain structural dynamic characteristics. However, due to the mass effect of the transducer, the measured results of lightweight structure are inaccurate. This paper proposes using strain gauges to test the mode of lightweight structures, and we take the cantilever beam as an example. The paper derived strain modal expressions. We use the strain gauges, the accelerometers and the finite element simulation to test the modal of the cantilever. To compare and analyze the experimental data, it illustrates that the strain modal test methods can measure the bending mode of the beam effectively.

Abstract: The two-degree-of-freedom (two-dof) shock isolation system has been presented based on the woodpecker’s head structure. The effect of the system parameters on the performance of the shock isolation system has been studied by using transient responses and shock response spectrum. The results show that appropriate parameters can effectively reduce the maximum acceleration and displacement of the woodpecker’s brain. The discussion provides a new insight to the shock isolation mechanism of woodpecker’s head, and would be useful for the design of shock isolation.

Abstract: This essay will find a new way to prevent technical unlocking and violence through the cylinder lock through the narrow cylinder bore for the purpose of improving the performance of the theft. The miniaturization of the keyhole and cylinder locks, it makes the lock cylinder by means of the implementation does not have enough space, greatly limits the unlocking illegal activities. Meanwhile, the new lock cylinder has the advantage of mutual opening rate lower.

Abstract: We discover that the given initial structural density value has significant influence on the final result of multi-material topology optimization when adopting the SIMP interpolation scheme. The influence cannot be ignored if the grid is sparse, and there is a certain degree of periodic relationship between the structural minimum compliance and the given initial density value. By modifying the initial structural density value, a better topology optimization result with a smaller compliance can be obtained. The expression is proposed on how to modify the initial structural density value to get better results in multi-material topology optimization problems.

Abstract: Airbag is widely used in heavy equipment dropped field with its efficient cushion performance and low cost. The calculation method used now for the process of airbag landing mainly is simulative calculation: analytical analysis and finite element simulation, but there are less systematic introduction for the mathematical model behind these methods in past papers. This paper mainly does the summary for the mathematical model of vented airbag which is usually used.

Abstract: Establish the mathematical model of feeding velocity in Rubber Roller Husker vibrating feeder through analyzing the material movement, and determine the relational expression according to the theory analysis of material movement in the feeder. Analyzing the influence of groove obliquity angle , vibrating direction angle, frequencyand amplitude, which are simulated numerically by using the MATLAB software, and optimizing the material theoretical speed are the main objective. The optimal parameters of transmission and the experimental verification can provide more reference for the design of the Rubber Roller Husker vibrating feeding system.

Abstract: To improve the heavy-duty vehicles’ gear shock solution during shifting and improve shifting comfortable, a research direction is improve the performance of lockpin synchronizer. Through the analysis of the main technical parameters of lockpin synchronizer, got the main research direction to improve the performance of lockpin synchronizer. The synchronizer structure optimization design was discussed. And the synchronizer is simulated and analyzed using the virtual prototype technology, which give a way to improve the performance of synchronizer.

Abstract: Abstract: Whereas there exist such problems as compaction blind spot in the edge and cornier area of construction rod, and the narrow site has disabled the large rod roller to go into operation, an innovative design method based on the TRIZ theory has been put forward. Meanwhile, a detailed solution to the conflicts generated in the efforts to improve the differency of the large road roller has been proposed through the use of the contradiction conflict solution matrix comprised by 39 engineering parameters and 40 pieces of inventive principles pertaining to TRIZ. Furthermore, the feasibility to conduct TRIZ-theory-based innovative design in the field of engineering machinery has been manifested, thus providing important theoretical tools for design ideas in the field of traditional engineering innovation.