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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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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.
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Machines: Problem Solving II01:30

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Machines are complex structures consisting of movable, pin-connected multi-force members that work together to transmit forces. Consider a lifting tong carrying a 100 kg load. It comprises movable sections DAF and CBG linked together with member AB.
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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Dynamic-joint-strength-based two-dimensional symmetric maximum weight-lifting simulation: Model development and

Ritwik Rakshit1, Yujiang Xiang2, James Yang1

  • 1Human-Centric Design Research Lab, Department of Mechanical Engineering, Texas Tech University, Lubbock, TX, USA.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|April 9, 2020
PubMed
Summary
This summary is machine-generated.

This study models maximum weight lifting using dynamic joint strength to predict lifting motion. The simulation accurately predicted joint angles and vertical forces, aiding in understanding lifting biomechanics.

Keywords:
Liftingdynamic joint strengthinverse-dynamics optimizationmanual material handlingmaximum weightmotion predictionpredictive dynamicsstrength percentilevalidation

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Ergonomics

Background:

  • Predicting maximum lifting capacity is crucial for preventing injuries.
  • Existing models often simplify joint dynamics, limiting predictive accuracy.

Purpose of the Study:

  • To develop and validate a 2D simulation for predicting maximum weight-lifting capacity and motion.
  • To incorporate dynamic joint strength into an optimization framework for lifting prediction.

Main Methods:

  • An optimization formulation using dynamic joint strength (joint angle and angular velocity) was developed.
  • Nineteen participants performed a maximum-weight-box-lifting task.
  • Kinetic and kinematic data were collected using motion capture and force plates.

Main Results:

  • The 2D simulation accurately predicted joint angles (spine, shoulder, elbow, hip, knee, ankle) and box weights.
  • Vertical ground reaction forces were also predicted accurately.
  • Horizontal ground reaction forces showed less accurate prediction.

Conclusions:

  • The dynamic-joint-strength-based 2D optimization model provides a valid approach for predicting maximum lifting weight and motion.
  • The model's accuracy in predicting joint angles and vertical forces has implications for ergonomic assessments and injury prevention strategies.