An Experimental Investigation of the Dynamic Behavior of the Spatial RSSR Crank and Rocker Mechanism With an Asymmetrical Coupler

1976 ◽  
Vol 98 (4) ◽  
pp. 1231-1236
Author(s):  
W. S. Begg ◽  
J. R. Ellis
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Constant Velocity ◽  
Center Line ◽  
Constant Torque ◽  
Input And Output ◽  
Euler Approach ◽  
Force Components ◽  
Dynamic Investigation ◽  
Velocity Input

An experimental RSSR crank and rocker mechanism has been devised and manufactured to facilitate the dynamic investigation of the input and output torques present, the force components acting in the link members and at the joints of the machine under various loading conditions, for a number of different configurations. The behavior of the so-called redundant or passive degree of freedom is also investigated by means of a coupler (floating link) having its center of gravity offset from the center line of the spherical joints at its ends. Experimental observations are made for the constant torque and constant velocity input conditions, as obtained in a practical mechanism, for the various machine configurations and loading arrangements. An analytical model is developed using the classical Newton-Euler approach and an example of the correlation of the analytical and experimental results is given.

DYNAMIC BEHAVIOR OF TELESCOPIC CRANES BOOM

2013 ◽  
Vol 13 (01) ◽  
pp. 1350010 ◽  
Author(s):  
IOANNIS G. RAFTOYIANNIS ◽  
GEORGE T. MICHALTSOS
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Constant Velocity ◽  
Steel Beam ◽  
Continuum Approach ◽  
Theoretical Formulation ◽  
Modal Superposition ◽  
Superposition Technique

Telescopic cranes are usually steel beam systems carrying a load at the tip while comprising at least one constant and one moving part. In this work, an analytical model suitable for the dynamic analysis of telescopic cranes boom is presented. The system considered herein is composed — without losing generality — of two beams. The first one is a jut-out beam on which a variable in time force is moving with constant velocity and the second one is a cantilever with length varying in time that is subjected to its self-weight and a force at the tip also changing with time. As a result, the eigenfrequencies and modal shapes of the second beam are also varying in time. The theoretical formulation is based on a continuum approach employing the modal superposition technique. Various cases of telescopic cranes boom are studied and the analytical results obtained in this work are tabulated in the form of dynamic response diagrams.

scholarly journals Experimental Investigation of the Effects of Seat Position on Human Dynamic Behavior.

2000 ◽  
Vol 43 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Shuji NISHIYAMA ◽  
Norio UESUGI ◽  
Toru TAKESHIMA ◽  
Yuji KANO
Keyword(s):  
Experimental Investigation ◽  
Dynamic Behavior ◽  
Seat Position

Experimental and Analytical Investigation on Spaghetti Problem

2001 ◽  
Author(s):  
Yoshimasa Komaki ◽  
Nobuyuki Kobayashi ◽  
Masahiro Watanabe
Keyword(s):  
Dynamic Behavior ◽  
Multibody Dynamics ◽  
Constant Velocity ◽  
Analytical Investigation ◽  
Experimental Results ◽  
Flexible Beam ◽  
Gap Size ◽  
Lateral Vibration ◽  
Elastic Wall ◽  
Pulling Velocity

Abstract The dynamic behavior of the flexible beam, which is pulled into the slit of the elastic wall with a constant velocity, is discussed with multibody dynamics formulation and experiments. The vibration of the free tip of a flexible beam increases rapidly as pulling into the slit, and this behavior is called “Spaghetti Problem”. The effect of gap size of the slit on the behavior of Spaghetti Problem is especially focused. Dynamic behavior of the beam is simulated numerically and examined the accuracy of the presented formulation by changing the gap size and the pulling velocity of the beam as parameters. It is clarified that the presented modeling method simulates the experimental results quite well, and the gap size and the pulling velocity influence the increase of the lateral vibration near the inlet of the slit.

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