scholarly journals Induced Acceleration Analysis of Three-Dimensional Multi-Joint Movements and Its Application to Sports Movements

10.5772/22266 ◽  
2011 ◽  
Author(s):  
Masaya Hirashima
Keyword(s):  
Three Dimensional ◽  
Acceleration Analysis

Second-Order Contact Kinematics Between Three-Dimensional Rigid Bodies

2019 ◽  
Vol 86 (8) ◽  
Author(s):  
J. Zachary Woodruff ◽  
Kevin M. Lynch
Keyword(s):  
Three Dimensional ◽  
Rigid Bodies ◽  
Second Order ◽  
Contact Kinematics ◽  
Acceleration Analysis ◽  
Order Contact

In this discussion, we provide corrections to the second-order kinematic equations describing contact between three-dimensional rigid bodies, originally published in Sarkar et al. (1996) [“Velocity and Acceleration Analysis of Contact Between Three-Dimensional Rigid Bodies,” ASME J. Appl. Mech., 63(4), pp. 974–984].

Velocity and Acceleration Analysis of Contact Between Three-Dimensional Rigid Bodies

1996 ◽  
Vol 63 (4) ◽  
pp. 974-984 ◽  
Author(s):  
N. Sankar ◽  
V. Kumar ◽  
Xiaoping Yun
Keyword(s):  
Rigid Body ◽  
Relative Motion ◽  
Three Dimensional ◽  
Rigid Bodies ◽  
Local Surface ◽  
Contact Points ◽  
Pure Rolling ◽  
Acceleration Analysis ◽  
Rigid Body Motions ◽  
Two Bodies

During manipulation and locomotion tasks encountered in robotics, it is often necessary to control the relative motion between two contacting rigid bodies. In this paper we obtain the equations relating the motion of the contact points on the pair of contacting bodies to the rigid-body motions of the two bodies. The equations are developed up to the second order. The velocity and acceleration constraints for contact, for rolling, and for pure rolling are derived. These equations depend on the local surface properties of each contacting body. Several examples are presented to illustrate the nature of the equations.

Equivalence relationship between a three-axis centrifugal test load and flight load

2018 ◽  
Vol 07 (01n02) ◽  
pp. 1850011
Author(s):  
Gege Liu ◽  
Yahong Zhang ◽  
Xinong Zhang
Keyword(s):  
Degrees Of Freedom ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Equivalence Relations ◽  
Analysis Model ◽  
High Acceleration ◽  
Energy Equivalence ◽  
Acceleration Analysis ◽  
Equivalence Relationship ◽  
Centrifugal Test

For aircraft flying with high accelerations and high acceleration change rates in three-dimensional space, load simulation tests are usually carried out in a three-axis centrifuge with three degrees of freedom. A triaxial centrifugal test that simulates the actual flight environment must reflect the real effect of the flight load on the structure. An acceleration analysis model of a three-axis centrifuge in body coordinates is established to meet this requirement. The spatial distribution of the acceleration and the effects of kinematic parameters on acceleration are analyzed. Using the acceleration analysis model, the displacement equivalence and strain energy equivalence relations of a beam in a centrifugal environment and actual flight environment are studied. Moreover, equivalence relationships meeting requirements are proposed and validated for a specific example. The distribution of the acceleration and the equivalence relations of the two environments are the basis for the ground simulation of flight loads.

Contact Kinematics between Three-Dimensional Rigid Bodies with General Surface Parameterization

2020 ◽  
pp. 1-28
Author(s):  
Mubang Xiao ◽  
Ye Ding
Keyword(s):  
Reference Frame ◽  
Relative Motion ◽  
Screw Theory ◽  
Dimensional Space ◽  
Contact Point ◽  
Three Dimensional ◽  
Rigid Bodies ◽  
Frame Field ◽  
Contact Kinematics ◽  
Acceleration Analysis

Abstract This paper provides an improvement of the classic Montana's contact kinematics equations considering non-orthogonal object parameterizations. In Montana's model, the reference frame used to define the relative motion between two rigid bodies in three-dimensional space is chosen as the Gauss frame, assuming there is an orthogonal coordinate system on the object surface. To achieve global orthogonal parameterizations on arbitrarily shaped object surfaces, we define the relative motion based on the reference frame field, which is the orthogonalization of the surface natural basis at every contact point. The first- and second-order contact kinematics, including the velocity and acceleration analysis of the relative rolling, sliding, and spinning motion, are reformulated based on the reference frame field and the screw theory. We use two simulation examples to illustrate the proposed method. The examples are based on simple non-orthogonal surface parameterizations, instead of seeking for global orthogonal parameterizations on the surfaces.

The Seismic Analysis of Kiewitt Shell Based on the SMA Three-Dimensional Isolator

2010 ◽  
Vol 163-167 ◽  
pp. 4570-4574
Author(s):  
Jin Li Wang ◽  
Hai Qing Liu
Keyword(s):  
Seismic Analysis ◽  
Three Dimensional ◽  
Outer Part ◽  
Time History ◽  
Internal Force ◽  
Rubber Bearing ◽  
Base Isolator ◽  
Laminated Rubber Bearing ◽  
Lattice Damage ◽  
Acceleration Analysis

The SMA 3D isolator is based on a new intelligent material: shape memory alloy, which compensate the weakness in stiffness of the laminated rubber bearing. Through the seismic analysis of the kettlewell double layer shell, the truss horizontal and vertical internal force dropped obviously with the SMA 3D base isolator, especially the outer part which easily happened deformed damage and the structure internal force distribution is more reasonable, the deformation in harmonies, the lattice damage of weakness part is limited and offer efficient protection. Either the acceleration analysis, the peak acceleration reduced significantly and time history tends to slow, the isolating effect of the SMA 3D base isolator is prior to the laminated rubber bearing.

The effect of multiple segment interaction dynamics on elbow valgus load during baseball pitching

2017 ◽  
Vol 232 (4) ◽  
pp. 285-294 ◽  
Author(s):  
Kozo Naito ◽  
Tokio Takagi ◽  
Hideaki Kubota ◽  
Takeo Maruyama
Keyword(s):  
Internal Rotation ◽  
Motion Capture ◽  
Three Dimensional ◽  
Underlying Mechanism ◽  
Valgus Stress ◽  
Dependent Effect ◽  
Risk Of Injury ◽  
Collegiate Baseball ◽  
Acceleration Analysis ◽  
Shoulder Kinematics

Elbow valgus load generated in baseball pitching is a risk factor for throwing-related injuries. However, an induced acceleration analysis establishing the cause–effect relationship between elbow valgus load and causal joint kinematics is lacking. The purpose of this study was to identify the underlying mechanism of how the elbow valgus load is generated by muscular and non-muscular interactive torque effects. The throwing motions of five fastball pitches from 16 male collegiate baseball pitchers were measured by a three-dimensional motion capture system. The induced acceleration analysis developed in this study was used to separate the elbow valgus stress of the throwers into causal muscular and interactive torque components. The results showed that the shoulder internal rotation torque-induced component was greatest, accounting for 73.0% of the valgus-related contribution, while the other joint components in the muscular and interactive torque components were relatively smaller. This implied that the elbow valgus stress was highly influenced by the internal rotation torque effect, while the motion-dependent effect due to the trunk and shoulder kinematics was not influential. In conclusion, to reduce the risk of injury, pitchers should acquire proper coordination without excessive shoulder internal rotation action.

Velocity and Acceleration Analysis of Contact Between Three-Dimensional Rigid Bodies

1994 ◽  
Author(s):  
Nilanjan Sarkar ◽  
Vijay Kumar ◽  
Xiaoping Yun
Keyword(s):  
Rigid Body ◽  
Relative Motion ◽  
Three Dimensional ◽  
Rigid Bodies ◽  
Local Surface ◽  
Contact Points ◽  
Pure Rolling ◽  
Acceleration Analysis ◽  
Rigid Body Motions ◽  
Two Bodies

Abstract During manipulation and locomotion tasks encountered in robotics, it is often necessary to control the relative motion between two contacting rigid bodies. In this paper we obtain the equations relating the motion of the contact points on the pair of contacting bodies to the rigid body motions of the two bodies. The equations are developed up to the second order. The velocity and acceleration constraints for contact, for rolling, and for pure rolling are derived. These equations depend on the local surface properties of each contacting body. Several examples are presented to illustrate the nature of the equations.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

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