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Related Concept Videos

Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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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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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...
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Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Work and Energy for Variable Forces01:10

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When an object is acted upon by a variable force, the amount of work done and the change in energy of the object can be more complex to calculate compared to when a constant force is applied. Work is the product of force and displacement, while energy is the capacity of a system to do work. When a constant force is applied to an object, the work done can be calculated as the product of the force and the distance moved in the direction of the force. However, when a variable force is applied, the...
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Stresses in a Shaft01:18

Stresses in a Shaft

366
The shaft PQ is subjected to a twisting force when equal and opposite torques are applied on either side. A section that cuts perpendicular to the shaft's axis at any arbitrary point R is examined to understand this. When the free-body diagram of the QR segment is analyzed, it reveals the shearing forces exerted by the PR portion onto the QR segment as the shaft experiences twisting.
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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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Soft skeletons transmit force with variable gearing.

Olaf Ellers1, Kai-Isaak Ellers2, Amy S Johnson1

  • 1Biology Department, Bowdoin College, Brunswick, ME 04011, USA.

The Journal of Experimental Biology
|May 13, 2024
PubMed
Summary
This summary is machine-generated.

Soft hydrostatic skeletons, like those in animals and engineered actuators, transmit force via internal pressure. Their mechanical advantage and displacement change with deformation, impacting work transmission efficiency.

Keywords:
Displacement advantageElastic energyFiber windingHydrostatMechanical advantageSkeletonTube feet

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Area of Science:

  • Biomechanics
  • Soft Robotics
  • Comparative Physiology

Background:

  • Hydrostatic skeletons enable force transmission in soft-bodied organisms (e.g., octopus arms, earthworms).
  • Inspired by nature, soft engineered actuators utilize hydrostatic principles.
  • A theoretical framework is needed to understand mechanical work in hydrostatic systems.

Purpose of the Study:

  • To model the mechanics of natural and engineered hydrostatic skeletons.
  • To determine the mechanical advantage (MA) and displacement advantage (DA) of these systems.
  • To elucidate the relationship between morphology and mechanical performance.

Main Methods:

  • Developed computational models for shape change and mechanics of hydrostatic skeletons.
  • Analyzed biological examples (sea star tube feet, earthworm segments) and engineered actuators (hydraulic press, McKibben actuator).
  • Investigated the role of helical fiber winding in structural integrity and force distribution.

Main Results:

  • Hydrostatic skeletons exhibit variable gearing, with MA changing during deformation.
  • Transmission efficiency (MA × DA) is influenced by the capacity for elastic energy storage.
  • Helical fiber windings are crucial for maintaining shape and distributing forces.

Conclusions:

  • The study provides a conceptual basis for understanding hydrostatic skeleton mechanics.
  • Morphology, particularly helical fiber arrangements, significantly impacts mechanical performance.
  • This work can inform the design of advanced soft robotic actuators.