Closure to “Discussions of ‘Dynamic Analysis of Long-Travel, High-Efficiency Shock Absorbers in Freight Cars’” (1970, ASME J. Eng. Ind., 92, pp. 588–589)

1970 ◽  
Vol 92 (3) ◽  
pp. 589-589
Author(s):  
F. Freudenstein
Keyword(s):  
Dynamic Analysis ◽  
High Efficiency ◽  
Shock Absorbers

Dynamic Analysis of Long-Travel, High-Efficiency Shock Absorbers in Freight Cars

1970 ◽  
Vol 92 (3) ◽  
pp. 581-588
Author(s):  
F. Freudenstein
Keyword(s):  
Dynamic Analysis ◽  
High Efficiency ◽  
Sliding Friction ◽  
Classical Mechanics ◽  
Parameter Analysis ◽  
Design Parameters ◽  
Shock Absorbers ◽  
Closure Time ◽  
Lumped Parameter ◽  
Principal Design

A dynamic analysis is presented relating the principal design parameters of a constant force type, dissipative shock absorber to the forces experienced by a resilient lading. The analysis, which correlates the effects of coupler force, lading force, cushion travel, closure time, impact speed, and friction, represents an application of classical mechanics to a dynamical system with sliding friction (Coulomb damping). Although a lumped-parameter analysis forms the basis of the derivation, a procedure is described which takes into account the mass- and compliance distribution within the lading.

Dynamic Analysis of the Pipe Lifting Mechanism on the Deepwater Pipelaying Vessel

2011 ◽  
Vol 199-200 ◽  
pp. 251-256
Author(s):  
Kai An Yu ◽  
Ke Yu Chen
Keyword(s):  
Numerical Analysis ◽  
Dynamic Analysis ◽  
High Efficiency ◽  
Transport Systems ◽  
Kinematic Pair ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Upper Limit ◽  
Lifting Capacity ◽  
Limit Position

Based on requirements of pipe transport systems on deepwater pipelaying vessel, a new pipe lifting mechanism was designed. It was composed of crank-rocker and rocker-slider mechanism with good lifting capacity and high efficiency. When the slider went to the upper limit position, the mechanism could approximatively dwell, meeting the requirement for transverse conveyor operation. According to the theory of dynamics, numerical analysis method was used to the dynamic analysis of the mechanism. The results showed the maximum counterforce was at the joint between the rocker and ground, and this calculation could be a guideline for the kinematic pair structure designing.

Case Study of Seismic Response for Shell Key Gasification Equipment Based on Transient Dynamic Analysis

2016 ◽  
Author(s):  
Jun Shen ◽  
Yunlong Wu ◽  
Heng Peng ◽  
Yinghua Liu
Keyword(s):  
Dynamic Analysis ◽  
Cross Sections ◽  
Coal Gasification ◽  
High Efficiency ◽  
Seismic Analysis ◽  
Seismic Load ◽  
Fe Model ◽  
Transient Dynamic Analysis ◽  
Transient Dynamic ◽  
Gasification Process

Coal gasification is a key technology for clean coal conversion with high efficiency. During the past decade, more than twenty Shell Key Gasification Equipments (SKGE) used in the Shell Coal Gasification Process (SCGP) have been built in coal-to-chemicals industry in China. SKGE is composed of Gasifier and Syngas cooler which are connected by Transfer duct. The support skirt of the Gasifier base is fixed, while the Syngas cooler side is supported by a constant hanger (floating support). In this paper, a FE model of the largest 2000-ton SKGE system in China is established by using ANSYS. The global dynamic response under the seismic load is simulated. In order to verify the correction of the calculation, the results are also compared with that by using ABAQUS. Compared to the traditional static analysis, it can be found that the deformation and stress distribution, the force and moment on several specified cross sections of SKGE change over time under seismic load based on the transient dynamic analysis. As the result of the seismic analysis is the prerequisite and foundation for accurate calculation of each key part (e.g. connection between Transfer duct and Gas reversal chamber), the seismic analysis is one of the most important analyses in the Gasification design, which will ensure the essential safety of SKGE system.

The Study of the New Type of Trim Corrector Efficiency, Based the Tests on Rigs and on Vehicle

2016 ◽  
Vol 822 ◽  
pp. 94-99
Author(s):  
Adrian Ioan Niculescu ◽  
Razvan Cristian Bujoaica
Keyword(s):  
High Efficiency ◽  
Pneumatic Pressure ◽  
Shock Absorbers ◽  
New Type

The paper purpose is to evaluate the efficiency of a new kind of suspension trim corrector based the tests on rigs an on the vehicle. The trim correction is realized by two pneumatic elements placed on the vehicle rear shock absorbers. The tests on rigs were realized on a hydropuls rig recording the force evolution with the stroke for some pneumatic pressure. Then the trim correctors were placed on the vehicle, being tested the trim evolution with the pneumatic pressure for some loaded states. Finally the tests were continued on road to evaluate their well behavior for some loaded vehicle states. All results confirmed the high efficiency of the new trim model and its well behavior on road. This reason the new trim corrector solution is in protection phase.

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