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Related Concept Videos

Three-Dimensional Force System01:30

Three-Dimensional Force System

In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...
Two-Dimensional Force System01:20

Two-Dimensional Force System

A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...
Calibration Curves: Linear Least Squares01:20

Calibration Curves: Linear Least Squares

A calibration curve is a plot of the instrument's response against a series of known concentrations of a substance. This curve is used to set the instrument response levels, using the substance and its concentrations as standards. Alternatively, or additionally, an equation is fitted to the calibration curve plot and subsequently used to calculate the unknown concentrations of other samples reliably.
For data that follow a straight line, the standard method for fitting is the linear...
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

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Related Experiment Video

Updated: May 15, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
09:32

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion

Published on: April 11, 2018

Surface EMG force modeling with joint angle based calibration.

Javad Hashemi1, Evelyn Morin, Parvin Mousavi

  • 1Department of Electrical and Computer Engineering, Queen's University, Kingston, ON, Canada, K7L 3N6.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|January 1, 2013
PubMed
Summary
This summary is machine-generated.

A new calibration method improves surface electromyogram (SEMG) force estimation by accounting for joint angle variations. This calibration enhances accuracy and simplifies SEMG-force models for better muscle activity analysis.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Kinesiology

Background:

  • Surface electromyogram (SEMG) amplitude varies with joint angle, complicating its use in force estimation.
  • Accurate SEMG-based force prediction is crucial for understanding muscle function and developing rehabilitation technologies.

Purpose of the Study:

  • To introduce and validate a calibration method to compensate for joint angle-dependent changes in SEMG amplitude.
  • To improve the accuracy of SEMG-based force estimation models.

Main Methods:

  • Calibration factors were derived from SEMG recordings of biceps and triceps brachii across seven elbow joint angles.
  • SEMG and wrist force data were collected during isometric contractions at constant force.
  • The fast orthogonal search method modeled the relationship between calibrated/non-calibrated SEMG, joint angle, and measured force.

Main Results:

  • Models using calibrated SEMG data showed statistically significant improvements in force estimation compared to non-calibrated data.
  • Calibration reduced the number of non-linear, joint angle-dependent terms needed in the SEMG-force model.
  • Calibration factors demonstrated potential for use in subsequent recording sessions and across different force levels.

Conclusions:

  • The proposed calibration method effectively compensates for joint angle variations in SEMG.
  • This calibration enhances the reliability and accuracy of SEMG-based force prediction models.
  • The method simplifies model complexity and shows promise for robust, long-term application.