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Related Concept Videos

Kinematic Equations - II01:17

Kinematic Equations - II

The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
Kinematic Equations - III01:18

Kinematic Equations - III

The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
Kinematic Equations - I01:26

Kinematic Equations - I

When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
Kinematic Equations for Rotation01:30

Kinematic Equations for Rotation

In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
For instance, imagine a point A on a rigid body engaged in circular motion. The translational velocity of this particular point can be calculated by taking the time derivatives of the displacement equation, which essentially measures the...
Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping

Published on: April 21, 2023

Virtual human hand: model and kinematics.

Esteban Peña-Pitarch1, Neus Ticó Falguera, Jingzhou James Yang

  • 1a Escola Politècnica Superior d'Enginyeria de Manresa (EPSEM-UPC) , Manresa , Spain.

Computer Methods in Biomechanics and Biomedical Engineering
|August 28, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a new 25 degrees of freedom (DOFs) virtual hand model for CAD applications. This model enhances virtual hand simulations for design, improving object manipulation assessments.

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Area of Science:

  • Biomechanical Engineering
  • Human-Computer Interaction
  • Computer-Aided Design (CAD)

Background:

  • The human hand's dexterity is crucial for daily tasks and object interaction.
  • Virtual hand models in CAD can optimize design processes by simulating manipulation capabilities early on.

Purpose of the Study:

  • To develop a novel, anatomically accurate, 25 degrees of freedom (DOFs) virtual hand skeletal model.
  • To lay the groundwork for a comprehensive hand simulation tool for object manipulation and grasping analysis.

Main Methods:

  • The model is based on detailed hand anatomy and kinematics, incorporating joint range of motion.
  • The Denavit-Hartenberg method was employed to define inter-joint relationships.
  • Finger workspace determination was a key aspect of the model's development.

Main Results:

  • A novel 25 DOFs virtual hand skeletal model was successfully created.
  • The model includes unique palm arching capabilities via four additional DOFs in the carpometacarpal and wrist joints for the ring and small fingers.

Conclusions:

  • The developed virtual hand model provides a more realistic representation of hand biomechanics.
  • This model serves as a foundational step towards advanced virtual hand simulation tools for design and ergonomic assessments.