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Related Concept Videos

Design of Transmission Shafts01:16

Design of Transmission Shafts

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The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
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Design of Transmission Shafts - Stress Analysis01:15

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Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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An innovative ski-boot: design, numerical simulations and testing.

Stefano Corazza1, Claudio Cobelli1

  • 1Department of Information Engineering - University of Padova , Italy.

Journal of Sports Science & Medicine
|January 24, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces an innovative ski-boot with a Stance Geometry System (SGS) for adjustable posture, enhancing knee stability and ski-boot stiffness through virtual design and experimental validation.

Keywords:
FEM analysisStance geometry systemskiing performancestiffnessvirtual design environment

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Area of Science:

  • Biomechanics
  • Sports Engineering
  • Orthopedics

Background:

  • Optimizing ski-boot ergonomics and biomechanics requires considering leg orientation relative to the ground.
  • Existing ski-boots lack adjustable features for frontal plane posture, potentially impacting performance and stability.
  • Skiing involves significant dynamic loads and deformations on ski-boots, necessitating robust design.

Purpose of the Study:

  • To design an innovative ski-boot with an adjustable Stance Geometry System (SGS) to optimize skier posture and biomechanics.
  • To evaluate the minimal stiffness requirements for the ski-boot system using a simplified deformation model.
  • To validate a Finite Elements Method (FEM) model of the ski-boot using experimental data from on-slope skiing.

Main Methods:

  • Development of the Stance Geometry System (SGS) allowing sole rotation about the antero-posterior axis for posture adjustment.
  • Experimental data collection of ski-boot deformations and loading conditions during various skiing scenarios.
  • Finite Elements Method (FEM) simulations for optimizing the ski-boot sole joint design and validating the ski-boot model.

Main Results:

  • Experimental measurements revealed mean loads up to 164% of body weight on the outer ski during turns.
  • The validated FEM model was used to optimize the ski-boot design for maximum stiffness.
  • The SGS design allows pre-skiing adjustment of lateral stance, enhancing ski-boot stiffness and intrinsic knee stability.

Conclusions:

  • The developed SGS ski-boot optimizes lateral stance adjustment, improving intrinsic knee stability and ski-boot system stiffness.
  • Virtual design, supported by experimental data, proved effective in optimizing the ski-boot.
  • The study provides a comprehensive dataset of skiing loads and validates an innovative ski-boot design for enhanced safety and performance.