Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Net Torque Calculations01:19

Net Torque Calculations

9.5K
When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
9.5K
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

208
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
208
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

267
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...
267
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

212
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
212
Screw: Problem Solving01:21

Screw: Problem Solving

444
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
444
Circular Shafts - Elastoplastic Materials01:24

Circular Shafts - Elastoplastic Materials

130
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
130

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Domain Adaptation for IMU Data to Enhance Objective Assessment of Friedreich Ataxia.

IEEE journal of biomedical and health informatics·2026
Same author

GD2 Identifies Cancer Stemness in Glioblastoma and Phytoalexin Library Screen Identifies Potential Novel Natural Inhibitors.

International journal of molecular sciences·2026
Same author

A low-noise low-impedance powered knee prosthesis with direct ball screw drive and torque-sensitive actuation.

The International journal of robotics research·2026
Same author

Portable hip exoskeleton improves walking economy for stroke survivors.

Nature communications·2026
Same author

A 3D gut-brain-vascular platform for bidirectional crosstalk in gut-neuropathogenesis.

Nature communications·2026
Same author

An Atypical Cause of Upper Gastrointestinal Bleeding in an Elderly Patient.

Cureus·2026

Related Experiment Video

Updated: Aug 4, 2025

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
08:59

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators

Published on: June 13, 2022

2.6K

Analysis and Validation of Sensitivity in Torque-Sensitive Actuators.

Minh Tran1, Lukas Gabert1,2, Tommaso Lenzi1,2,3

  • 1Department of Mechanical Engineering, The Robotics Center, University of Utah, Salt Lake City, UT 84112, USA.

Actuators
|April 3, 2023
PubMed
Summary

Researchers developed a new sensitivity metric to analyze and predict the performance of robotic transmissions. This tool helps design actuators for human-like performance in dynamic tasks, improving efficiency and power density.

Keywords:
compliant actuatorlegged locomotionprostheticsroboticstorque-sensitive actuatorvariable transmission

More Related Videos

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
06:45

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Published on: October 28, 2022

1.7K
Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

17.6K

Related Experiment Videos

Last Updated: Aug 4, 2025

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
08:59

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators

Published on: June 13, 2022

2.6K
Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
06:45

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

Published on: October 28, 2022

1.7K
Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

17.6K

Area of Science:

  • Robotics
  • Mechanical Engineering
  • Biomechanics

Background:

  • Robotics requires lightweight, efficient actuators with human-like performance.
  • Passive variable transmissions and torque-sensitive transmissions offer solutions but lack robust modeling.
  • Analyzing complex transmission mechanisms in dynamic tasks is an ongoing challenge.

Purpose of the Study:

  • Introduce a novel sensitivity metric for analyzing transmission performance.
  • Develop an analytical model for this sensitivity metric.
  • Validate the metric's effectiveness in predicting actuator dynamics.

Main Methods:

  • Defined sensitivity as the relationship between input displacement and output torque.
  • Developed an analytical model for sensitivity in two torque-sensitive transmission designs.
  • Conducted experiments using powered knee prostheses to validate the model.

Main Results:

  • The sensitivity model accurately predicted actuator dynamic performance in experiments.
  • Demonstrated differences in performance between two transmission designs using the sensitivity metric.
  • Validated the utility of sensitivity analysis for transmission design.

Conclusions:

  • Sensitivity analysis is a valuable tool for designing robotic transmissions.
  • The metric aids in creating systems with human-like physical behavior.
  • This approach enhances actuator efficiency and power density for robotic applications.