Motion Analysis of Micropart in Dry Friction Environment Due to Surface Excitation Considering Microscale Forces

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
M. Rizwan ◽  
P. S. Shiakolas
Keyword(s):  
Dynamic Model ◽  
Motion Analysis ◽  
Surface Force ◽  
Active Surface ◽  
Inertia Force ◽  
Attraction Force ◽  
Relative Roughness ◽  
Surface Excitation ◽  
Flexible Surface ◽  
Asperity Deformation

This manuscript investigates the motion of a micropart on a dry nonlubricated controlled deformable surface considering the dynamically changing microforces while in contact with the surface. The motion analysis of a micropart on a flexible surface under controlled deformation is the first step to initiate feasibility of a micromanipulation device. At the micro/nanoscale, the surface force of attraction becomes more significant than the inertia force; thus motion analysis requires estimating and accommodating these forces in a dynamic model. The model considers microscale forces and surface roughness conditions (asperity deformation), while dynamically evaluating the friction coefficient and attraction force due to the dynamic asperity deformation as the micropart moves on a controlled deformation active surface. The parameters considered in the model include the micropart mass and size, the relative roughness between the micropart and surface, the surface and micropart material, and input actuator frequency, stroke, and deformation profile. The simulation results indicate that predictable micropart motion could be achieved but only within a certain range of input actuator frequencies. At lower frequencies no motion is possible while at higher frequencies the micropart detaches from the surface. The understanding of the effects of the microforces on the dynamic model and micropart motion would pave the way towards controlled micropart translocation and manipulation employing a flexible surface for microassembly or for processes requiring controlled micropart handling for heterogeneous microdevice mass production.

Dynamic Motion Analysis of Gesture Interaction

2016 ◽  
pp. 23-51 ◽  
Author(s):  
Toshiya Naka ◽  
Toru Ishida
Keyword(s):  
Dynamic Model ◽  
Motion Analysis ◽  
Facial Expressions ◽  
Analysis Method ◽  
Human Communication ◽  
Gesture Interaction ◽  
Common Features ◽  
Gesture Analysis ◽  
Before And After ◽  
Nonverbal Information

In human communication, nonverbal information such as gestures and facial expressions often plays a greater role than language, and an increasing number of devices are designed to be intuitively controlled by gestures. However, there are some disadvantages of this intuitive interaction. One of the chief problems is that these devices have difficulty in distinguishing between unconscious and intentional gestures; they tend to respond erroneously to unconscious movements. In this chapter, authors propose a new gesture analysis method based on the dynamic model. They focused on the “exaggerated gestures” that are effectively used in, such as Japanese Kabuki, effectively used in Disney's animation, and tried to identify their common features and effects. They noted the “preparation” or “follow-through” motions just before and after the emphasized actions and each behavior can be quantified by the undershoot and overshoot value of changes in torque. These methods can provide important knowledge for analyzing features and distinguishing intentions when interacting with gestures.

Three-Dimensional Numerical Manifold Method Based on Hexahedron Element with Full First-Order Cover Function and its Application in Underground Excavation

2007 ◽  
Vol 340-341 ◽  
pp. 365-370 ◽  
Author(s):  
Y.H. Zhang ◽  
Qian Sheng ◽  
Y.M. Cheng
Keyword(s):  
Three Dimensional ◽  
Shear Stiffness ◽  
Surface Force ◽  
Inertia Force ◽  
Numerical Manifold Method ◽  
Underground Excavation ◽  
Equilibrium Equations ◽  
First Order ◽  
Numerical Manifold ◽  
Cover Function

In this paper, three-dimensional(3D) Numerical Manifold Method (NNM) based on hexahedron element cover with full first-order cover function is proposed and the shape function of C8 isoparametric element in FEM is used as the cover weight function. All sub-matrices in equilibrium equations, including stiffness matrix, initial stress matrix, point force matrix, surface force matrix, body force matrix, inertia force matrix, contact matrix and friction matrix, are derived. Different with 2D contact, the direction of shear stiffness and friction force can not be easily defined in 3D contact. A new iterative method based on vector theory to detect the contact direction is developed. The application of 3D NMM in underground excavation is also presented and show good agreement with real engineering.

scholarly journals A Dynamic Model for Simulating Elephant-Lifting by Using a Tilting Frame

2020 ◽  
Vol 24 (5) ◽  
pp. 195-206
Author(s):  
Komsan Mianpet ◽  
Satjarthip Thusneyapan
Keyword(s):  
Dynamic Model ◽  
Motion Analysis ◽  
Standing Position ◽  
Displacement Velocity ◽  
The Real ◽  
Mechanism Model ◽  
Experimental Ethics ◽  
The Cost ◽  
Multi Body ◽  
Body Dynamic

A rigid multi-body dynamic model of an elephant was developed for motion analysis during tilt-lifting. The elephant lifting to standing position is required by veterinarians to perform surgery and bedsores treatment. The elephant mechanism dynamic model (EMDM) was developed by simplifying the skeleton to simple straight linkages connected by joints. The model consisted of 10 bones and 9 joints. A mechanical harness model (MHM) was developed. Two harnesses were attached to the tilt-frame mechanism model (FMM) and the EMDM; this assembly became the elephant dynamic during tilt-lifting model (EDTM). The developed EDTM permitted us to observe the displacement, velocity, and acceleration responses at any location on the elephant. The model allowed the virtual study of the motion, and avoided the real elephant testing; thus, the cost, time, and resources were reduced and no conflict with the animal experimental ethics. The simulation was found to be a valuable tool for engineers to design a suitable elephant bed. It permitted us to observe the operation, safety, and precaution of the equipment.

Motion analysis of a spherical mobile robot

Robotica ◽  
2009 ◽  
Vol 27 (3) ◽  
pp. 343-353 ◽  
Author(s):  
Vrunda A. Joshi ◽  
Ravi N. Banavar
Keyword(s):  
Path Planning ◽  
Mobile Robot ◽  
Spherical Shell ◽  
Dynamic Model ◽  
Motion Analysis ◽  
Practical Applications ◽  
Dynamic Decoupling ◽  
Planning Algorithm ◽  
Spherical Mobile Robot ◽  
Path Planning Algorithm

SUMMARYA path planning algorithm for a spherical mobile robot rolling on a plane is presented in this paper. The robot is actuated by two internal rotors that are fixed to the shafts of two motors. These are in turn mounted on the spherical shell in mutually orthogonal directions. The system is nonholonomic due to the nonintegrable nature of the rolling constraints. Further, the system cannot be converted into a chained form, and neither is it nilpotent nor differentially flat. So existing techniques of nonholonomic path planning cannot be applied directly to the system. The approach presented here uses simple geometrical notions and provides numerically efficient and intuitive solutions. We also present the dynamic model and derive motor torques for execution of the algorithm. Along the proposed paths, we achieve dynamic decoupling of the variables making the algorithm more suitable for practical applications.

Short-term volume and turgor regulation in yeast

2008 ◽  
Vol 45 ◽  
pp. 147-160 ◽  
Author(s):  
Jörg Schaber ◽  
Edda Klipp
Keyword(s):  
Dynamic Model ◽  
Volume Change ◽  
Volume Regulation ◽  
Time Course ◽  
Osmotic Shock ◽  
Intracellular Concentration ◽  
Short Term ◽  
Hydrodynamic Property ◽  
Turgor Regulation ◽  
Thermodynamic Framework

Volume is a highly regulated property of cells, because it critically affects intracellular concentration. In the present chapter, we focus on the short-term volume regulation in yeast as a consequence of a shift in extracellular osmotic conditions. We review a basic thermodynamic framework to model volume and solute flows. In addition, we try to select a model for turgor, which is an important hydrodynamic property, especially in walled cells. Finally, we demonstrate the validity of the presented approach by fitting the dynamic model to a time course of volume change upon osmotic shock in yeast.

Sign in / Sign up

Export Citation Format

Share Document