VERTICAL RIDING COMFORT OF ARTICULATED RAILWAY VEHICLES (A NEW METHOD FOR THE DYNAMIC ANALYSIS OF INTERMEDIATE VEHICLES IN A LONG TRAIN)

1986 ◽  
Vol 15 (sup1) ◽  
pp. 413-426 ◽  
Author(s):  
Masayuki Miyamoto ◽  
Hiroshi Fujimoto
Keyword(s):  
Dynamic Analysis ◽  
New Method ◽  
Railway Vehicles

A New Method and Automatic Generation for Dynamic Analysis of Complex Planar Mechanisms Based on the Ordered Single-Opened-Chains

1994 ◽  
Author(s):  
Jian-Qing Zhang ◽  
Ting-Li Yang
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Equation ◽  
Automatic Generation ◽  
The Other ◽  
New Method ◽  
Complex Mechanism ◽  
Planar Mechanisms ◽  
Spatial Mechanisms ◽  
General Dynamic

Abstract This work presents a new method for kinetostatic analysis and dynamic analysis of complex planar mechanisms, i.e. the ordered single-opened-chains method. This method makes use of the ordered single-opened chains (in short, SOC,) along with the properties of SOC, and the network constraints relationship between SOC,. By this method, any planar complex mechanism can be automatically decomposed into a series of the ordered single-opened chains and the optimal structural decomposition route (s) can be automatically selected for dynamic analysis, the paper present the dynamic equation which can be used to solve both the kinetostatic problem and the general dynamic problem. The main advantage of the proposed approach is the possibility to reduce the number of equations to be solved simultaneously to the minimum, and its high automation as well. The other advantage is the simplification of the determination of the coefficients in the equations, and thus it maybe result in a much less time-consuming algorthem. The proposed approach is illustrated with three examples. The presented method can be easily extended to the dynamic analysis of spatial mechanisms.

A New Method for Dynamic Analysis of Mistuned Bladed Disks Based on the Exact Relationship Between Tuned and Mistuned Systems

2002 ◽  
Vol 124 (3) ◽  
pp. 586-597 ◽  
Author(s):  
E. P. Petrov ◽  
K. Y. Sanliturk ◽  
D. J. Ewins
Keyword(s):  
Dynamic Analysis ◽  
Frequency Response Function ◽  
New Method ◽  
Test Cases ◽  
Finite Element Models ◽  
Bladed Disks ◽  
Sector Model ◽  
Bladed Disk ◽  
Parametric Studies ◽  
Exact Relationship

A new method for the dynamic analysis of mistuned bladed disks is presented. The method is based on exact calculation of the response of a mistuned system using response levels for the tuned assembly together with a modification matrix constructed from the frequency response function (FRF) matrix of the tuned system and a matrix describing the mistuning. The main advantages of the method are its efficiency and accuracy, which allow the use of large finite element models of practical bladed disk assemblies in parametric studies of mistuning effects on vibration amplitudes. A new method of calculating the FRF matrix of the tuned system using a sector model is also developed so as to improve the efficiency of the method even further, making the proposed method a very attractive tool for mistuning studies. Various numerical aspects of the proposed method are addressed and its accuracy and efficiency are demonstrated using representative test cases.

Dynamic Analysis on Flexible Cable-Driven Parallel Mechanism

2014 ◽  
Vol 1006-1007 ◽  
pp. 298-303
Author(s):  
Qing Lin Chen ◽  
Qi Lin
Keyword(s):  
Linear Programming ◽  
Dynamic Analysis ◽  
Parallel Mechanism ◽  
Sudden Change ◽  
Programming Method ◽  
New Method ◽  
Linear Programming Method ◽  
Flexible Cable

The interference between cables and surface of acutator limits the movement in the cable-driven parallel mechanism. The mechanism with fixed hinge can’t absolutely avoid the interference point of the track when using linear programming method. One new method, named as distant interference, was proposed to pick out all the interferential points of the track. Based on the principle of symmetrical force, the alteration to position of the six fixed hinges and two extensive hinges eliminated the interference. Through the simulation of combined spiral movement, the workspace of the flexible cable-driven parallel mechanism is larger than that of the mechanism with fixed hinge and reduce the interferece of long and big track. Compared with the original mechanism, the value of cables force in the flexible cable-driven parallel mechanism is smooth, continous and no sudden change.

Analysis and Simulation for Balance of Rigid Rotors Based on ADAMS

2013 ◽  
Vol 655-657 ◽  
pp. 412-415
Author(s):  
Zuo Shi Liu ◽  
Yi Guo Wei
Keyword(s):  
Dynamic Analysis ◽  
Mechanical Systems ◽  
Inertial Force ◽  
New Method ◽  
Design Stage ◽  
Prototype Test ◽  
Balance Weight ◽  
Conventional Models ◽  
Stiffness And Damping ◽  
Rigid Rotors

Conventional models for mechanical rotors based on Automatic Dynamic Analysis of Mechanical Systems (ADAMS) are over-constraint. This paper proposes a new method for simulating the stiffness and damping of bearings using bushing and other kinematic pairs. Analysis and Simulation for balance of rigid rotors by ADAMS were performed. To reduce the imbalance inertial force, the balance weight of a take-up machine has been optimized. The results were verified by the prototype test. Our results suggest a more effective method for balance of mechanical rotors in the design stage.

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