Papers by Keyword: Elastic Support

Abstract: The article deals with damping design for steel platform with sorters for limestone. The steel platform has very small damping for two vibration sorters. The sorters are situated in the third floor of old reinforced concrete frame building. The sorters (Fig. 1) are supported by rubber springs (Fig. 2), bud the rest energy from vibration of sorters excite the supporting platform. The response of the platform is unacceptable for both service people and for technology. Therefore vibration absorber for minimization of the response of the steel platform was developed

Abstract: The approach slab is the structural member of transition zones, which compensates a different settlement of bridge abutment and a road embankment. The main reason of different settlement is the consolidation of soil under the slab and the abutment. The geometry of approach slab, its length and the thickness is defined on the basis of differential settlement of embankment and the abutment. The static behaviour of slab is defined as a slab on elastic soil. The reinforced concrete slab is supported with the line rigid support on the one edge, and the rest of slab area interacts with the soil. The civil engineers design the reinforcement in those slabs based on the simplified structural scheme, without considering the elastic area support. This scheme is the simple supported slab on the both ends. The paper is dealing with the comparing of different structural models of the reinforced concrete approach slabs. The complex models of transition zones with the brick elements of the soil and the interaction with the reinforced concrete slab with the soil embankment are compared with the simplified models used by civil engineers. The analysis was performed on the transition zone of highway bridge from Slovakia based on its geometry and the subsoil consistence. In the parametric study was compared 8 soil stiffness’s on 10 structural models.

Abstract: In this paper, a mechanical model has been established for elastic support element of high speed winding machine, and an analytical-experimental study has been carried out for the evaluation of frequency dependence the stiffness and damping of the "O" type rubber ring, the key factors which influence the stiffness and damping have been obtained. This lays a foundation for further study on frequency characteristic of kinetic parameters of high speed winding machine elastic support system.

Abstract: In this study, the mechanical structural model of helical gear tri-branching transmission system has been established to analyze the power-split characteristics. For the purpose of calculating power-split value, a simplified algorithm is developed through formulating the deformation compatibility condition and the torque equilibrium condition. Under the elastic support, the static equilibrium equations should be built to calculate the power-split under different conditions based on the projection of installation error and elastic deformation on the line of action as described. A numerical example was provided to illustrate the developed theory. The research results herein would be done to improve the applicability of tri-branching transmission.

Abstract: The equilibrium equations of elastic support circular arches considering geometrical imperfections are deduced from variation principle. And the relations between external load, radial displacement and axial forces are determined; also the equilibrium conditions of snap-through buckling and bifurcation buckling in circular arch are ascertained respectively. Further, influences of geometrical imperfections and elastic supports on in-plane stability are analysis with analytical and finite element (FE) method. And the compared results display that the two methods coincide with each other very well for smaller opening angle in circular arches. The geometrical imperfections have only certain effects on the buckling path, while the elastic support rigidity play a significant role in both the path and critical load of snap-through buckling.

Abstract: The dynamics of elastic support beam are studied and the latent equation of the freely vibration modes of elastic bearing beam is deduced. The equation of the forced vibration of an elastically supported beam is obtained by the Lagrange equations and the influence of spring stiffness and moving load speed are analyzed. Calculation results show: the elastic supports have great effects on responses of beams, the dynamic amplification of deflections and stresses increases with the spring stiffness; the dynamic response of beam also increase with the increase of the speed of moving loads.

Abstract: In order to accurately get gear transmission system dynamic characteristics of transmission shaft for discrete processing. Numerical simulation gear meshing internal dynamic incentive, the improved gear pair of dynamic model for computing; At the same time, the simulation of rolling bearing in contact with the dynamic characteristic of the lubrication, consider the gearing mesh time-varying characteristic, the drive shaft bending-torsional coupling and supporting elastic establish single grade gear transmission prototype model. The simulation results show that different supporting conditions would lead to the simulation result differences, the elastic supporting more actual.

Abstract: When the loading sustained by the foundation is large, employing piled raft foundation is one of the best solutions. In the elasto-plastic design of piled raft, piles could improve the differential settlement and reduce raft thickness. As the raft sustains high earth and water pressures, by reducing the span length of raft and excavation depth, one can get economic design. Using elasto-plastic property of the pile is a better method to avoid increasing the pile length and pile diameter and making full capacity of the piled raft foundation in design compared to normal piled raft. With adoption of few small diameter piles, the raft thickness could be reduced significantly. This makes it much better than raft foundation.

Abstract: A finite element model of the elastic support rotor system based on the corresponding experimental model was established. According to the principle of two types of model with an equal first order critical speed, the equivalent stiffness and damping of a rolling ball bearing support system with rubber rings determined by experiment were transferred into the finite element model. Then, the dynamic behavior of rotor systems with symmetric and asymmetric structure, different support system stiffness and support span were calculated and analyzed respectively. At last, the influence of the rotor structural parameters on the equivalent stiffness of elastic bearing support system obtained by experiment was pointed out.

Abstract: Shock load spectrum of elastic support gearbox is confirmed by Federation Wehrmacht vessel construction rules BV0430/85 standard, and convert into equivalent double-triangular wave acceleration shock load. We take one elastic support gearbox which used in a vessel as computational study subject. With the help of ABAQUS software, we establish finite element model of elastic support gearbox and put double-triangular shock load into finite element model. Taking finite element analysis method do time domain response characteristics numerical simulation research of elastic support gearbox with limited bit and unlimited bit design, respectively, under shock load effect.