Dynamic modeling and experimental results for a head tilt response

2010 ◽  
Author(s):  
D Geisinger ◽  
E Ferreira ◽  
A Suarez ◽  
H Suarez
Keyword(s):  
Dynamic Modeling ◽  
Head Tilt ◽  
Experimental Results ◽  
Tilt Response

Experimental and Numerical Hydrodynamic Modeling of an Underwater Manipulator

2001 ◽  
Author(s):  
A. Khanicheh ◽  
A. Tehranian ◽  
A. Meghdari ◽  
M. S. Sadeghipour
Keyword(s):  
Drag Coefficient ◽  
Dynamic Modeling ◽  
Hydrodynamic Model ◽  
Degrees Of Freedom ◽  
Added Mass ◽  
Hydrodynamic Modeling ◽  
Degree Of Freedom ◽  
Experimental Results ◽  
Underwater Manipulator ◽  
Three Degrees Of Freedom

Abstract This paper presents the kinematics and dynamic modeling of a three-link (3-DOF) underwater manipulator where the effects of hydrodynamic forces are investigated. In our investigation, drag and added mass coefficients are not considered as constants. In contrast, the drag coefficient is a variable with respect to all relative parameters. Experiments were conducted to validate the hydrodynamic model for a one degree-of-freedom manipulator up to a three degrees-of-freedom manipulator. Finally, the numerical and experimental results are compared and thoroughly discussed.

Head tilt response: A complementary test to the Subjective Visual Vertical

2010 ◽  
Vol 20 (5) ◽  
pp. 381-389 ◽  
Author(s):  
Dario Geisinger ◽  
Enrique Ferreira ◽  
Alejo Suarez ◽  
Hamlet Suarez
Keyword(s):  
Head Tilt ◽  
Subjective Visual Vertical ◽  
Visual Vertical ◽  
Tilt Response

Evaluation of Compacting of Fresh Concrete through Vibration Based on the Newton Viscous Model

2018 ◽  
Vol 880 ◽  
pp. 347-352 ◽  
Author(s):  
Ramona Pinţoi ◽  
Adriana Ionescu
Keyword(s):  
Dynamic Modeling ◽  
Fresh Concrete ◽  
Dynamic Compaction ◽  
Experimental Results ◽  
Dissipated Energy ◽  
Displacement Curve ◽  
Vibration Frequencies ◽  
Stationary Vibration ◽  
Vibration Parameters ◽  
Compaction Degree

The paper is based on dynamic modeling research and experimental results obtained for freshly compacted concrete under stationary vibration. Thus, computational relationships and laws for vibration parameters and dissipated energy will be presented. In correlation with the dissipated energy, it will be evidenced by the evolution of the compaction degree and the resistance of the concrete depending on the vibration duration. It is noted that significant correlations have been established between the displacement curve of the dissipated energy and the loop hysteresis area for several vibration frequencies specific to the dynamic compaction regime

Dynamic Modeling and Mobility Analysis of the 3-R(RRR)R+R Antenna Mechanism

Robotica ◽  
2021 ◽  
pp. 1-19
Author(s):  
Guoxing Zhang ◽  
Donghao Zheng ◽  
Jinwei Guo ◽  
Yulei Hou ◽  
Daxing Zeng
Keyword(s):  
Mathematical Model ◽  
Dynamic Model ◽  
Dynamic Simulation ◽  
Dynamic Modeling ◽  
Theoretical Basis ◽  
Research Work ◽  
Experimental Results ◽  
Mobility Analysis ◽  
Motion Characteristics ◽  
Mathematical Model Analysis

SUMMARY A novel 3-R(RRR)R+R (R as revolute joint) hybrid antenna mechanism (HAM) is proposed for noncircular polarized antenna. First, its mobility characteristic is analyzed. Besides, its kinematics is deduced, and the velocity and acceleration are obtained. Afterward, its dynamic model is established. The actuation torques of each actuation joint are obtained. Its actuation torques are verified by mathematical model analysis and dynamic simulation. Furthermore, its workspace is also presented. Finally, the motion characteristics experimental results show that the 3-R(RRR)R+R HAM can carry out the azimuth and pitch motion. This research work serves as a fundamental theoretical basis for its further application.

The Synergistically Propelled Ichthyoid: Dynamic Modeling, Simulation, and Experimental Results

2011 ◽  
Author(s):  
Paul C. Strefling ◽  
Aren M. Hellum ◽  
Ranjan Mukherjee
Keyword(s):  
Reference Frame ◽  
Dynamic Modeling ◽  
Dynamic Models ◽  
Complex Model ◽  
Experimental Results ◽  
Inertial Reference Frame ◽  
Experimental Realization ◽  
Flexible Tail ◽  
Modeling Simulation

We have developed a novel type of submersible called a Synergistically Propelled Ichthyoid [SPI] which is propelled by the combined jet and tail action of a fluttering fluid-conveying pipe. Two dynamic models for an SPI are presented and solved; an analytically tractable model in an inertial reference frame and a more complex model in a general planar reference frame. The latter model has been solved numerically—these simulations show a benefit to using a fluttering tail relative to a dimensionally identical rigid tail. Construction details of an experimental realization are provided. Preliminary measurements taken using that platform are also provided which qualitatively confirm the simulation’s conclusion that a fluttering flexible tail is capable of higher speed than a dimensionally identical rigid tail.

Dynamic Modeling of Shaking Table Based on Simulink/SimMechanics

2014 ◽  
Vol 599-601 ◽  
pp. 292-295
Author(s):  
Wei Bo Liu ◽  
Guang Feng Guan ◽  
Wei Xiong ◽  
Hai Tao Wang ◽  
Jing Feng He
Keyword(s):  
Control System ◽  
Dynamic Modeling ◽  
Control Strategy ◽  
System Simulation ◽  
Experimental Results ◽  
Shaking Table ◽  
Simulation Platform ◽  
Hydraulic Cylinders ◽  
New Type

This essay focuses on a new type 2-DOF shaking table, which is driven by four hydraulic cylinders. Taking 2-DOF shaking table for example, in order to conveniently and rapidly achieve the control system simulation , using Simulink for simulation platform and combining with SimMechanics. Build dynamic modeling in SimMechanics and use Simulink to build servo system. The experimental results show that it can provide the efficient and significant simulation platform to research the control strategy of shaking table.

Dynamic modeling and experimental evaluation of a constant-force dielectric elastomer actuator

2012 ◽  
Vol 24 (6) ◽  
pp. 779-791 ◽  
Author(s):  
Giovanni Berselli ◽  
Rocco Vertechy ◽  
Mitja Babič ◽  
Vincenzo Parenti Castelli
Keyword(s):  
Structural Properties ◽  
Dynamic Modeling ◽  
Experimental Evaluation ◽  
Bond Graph ◽  
Dielectric Elastomer ◽  
Experimental Results ◽  
Time Dependent ◽  
System Response ◽  
Constant Force ◽  
Force Profile

Constant-force actuators based on dielectric elastomers can be obtained by coupling a dielectric elastomer film with particular compliant frames whose structural properties must be carefully designed. In any case, the practical achievement of a desired force profile can be quite a challenging task owing to the time-dependent phenomena, which affect the dielectric elastomer’s electromechanical response. Within this scenario, a hyperviscoelastic model of a rectangular constant-force actuator is reported. The model, based on the bond graph formalism, can be used as an engineering tool when designing and/or controlling actuators that are expected to work under given nominal conditions. Simulations and experimental results are provided, which predict the system response to fast changes in activation voltage and actuator position as imposed by an external user.

Comprehensive analyses of the elasto-plastic oblique contact-impact with vibration response

2018 ◽  
Vol 233 (2) ◽  
pp. 441-454 ◽  
Author(s):  
Wenjun Meng ◽  
Yao Wang
Keyword(s):  
Dynamic Modeling ◽  
Transverse Vibration ◽  
Flat Surface ◽  
Influence Factor ◽  
Contact Point ◽  
Vibration Response ◽  
Experimental Results ◽  
Vibration Responses ◽  
Contact Impact ◽  
The Impact

Contact-impact between different surfaces is a ubiquitous phenomenon especially in the mechanical systems. Previous work of authors indicated that the effect of longitudinal and/or transverse vibration response during the motion and dynamic modeling cannot be neglected for the elasto-plastic contact-impact events. In this study, further analyses were performed to characterize the contribution of longitudinal and transverse vibration responses during the elasto-plastic oblique contact-impact, and the formula to calculate the influence factor of vibration, ξ, was proposed based on the contact force with different vibrations during the impact. The momentum theorem and assumed mode method were used to develop the equations of motion of a flexible bar with a solid flat surface. Simulation results were compared with experimental results reported in the literature to verify the accuracy of the established model. The tangential and normal velocities of the contact point after the impact were compared with the simulations for different vibration cases, and the comparison between the simulations and the experimental results had yield encourage results. For different elasto-plastic materials, three critical initial impact angles had been found from the simulation to determine whether the flexible bar slides or sticks the flat surface. Although considering the effect of vibration response during the motion and dynamic modeling is very significant, increasing the number of shape functions did not effect the result significantly. The longitudinal and transverse vibration responses were found to effect the normal and tangential velocities of the contact point after the impact, respectively. Moreover, it had been shown that for the oblique contact-impact with sliding, considering the response of longitudinal and transverse vibration at the same time is more reasonable than other cases, which also reveals that, in this case, there is a good agreement between the simulation and experimental results. Besides, the mathematical expression on the influence factor of vibration depending on the initial velocity also had been obtained by a numerical analysis. This work can provide useful insights for dynamic modeling of complex multi-body systems during the contact-impact.

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