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

Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

738
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
738
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

810
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...
810
Ultrasonography01:17

Ultrasonography

6.5K
Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
6.5K
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

678
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...
678
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

514
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.
The concept of the shear center is crucial in countering the...
514
Design of Transmission Shafts01:16

Design of Transmission Shafts

904
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...
904

You might also read

Related Articles

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

Sort by
Same author

Mechanotransduction in tumor dynamics modeling.

Physics of life reviews·2023
Same author

Pore geometry influences growth and cell adhesion of infrapatellar mesenchymal stem cells in biofabricated 3D thermoplastic scaffolds useful for cartilage tissue engineering.

Materials science & engineering. C, Materials for biological applications·2021
Same author

Viscoelastic model characterization of human cervical tissue by torsional waves.

Journal of the mechanical behavior of biomedical materials·2020
Same author

Characterization of non-linear mechanical behavior of the cornea.

Scientific reports·2020
Same author

Cartilage biomechanics: A key factor for osteoarthritis regenerative medicine.

Biochimica et biophysica acta. Molecular basis of disease·2019
Same author

Damage prediction via nonlinear ultrasound: A micro-mechanical approach.

Ultrasonics·2018

Related Experiment Video

Updated: Apr 28, 2026

A Methodological Protocol and Considerations for Transcranial Ultrasonic Stimulation in Exploratory Clinical Human Studies
09:47

A Methodological Protocol and Considerations for Transcranial Ultrasonic Stimulation in Exploratory Clinical Human Studies

Published on: December 12, 2025

643

Torsional ultrasonic transducer computational design optimization.

J Melchor1, G Rus1

  • 1Dpt. of Structural Mechanics, University of Granada, Politécnico de Fuentenueva, 18071 Granada, Spain.

Ultrasonics
|June 3, 2014
PubMed
Summary

This study introduces a novel torsional piezoelectric ultrasonic sensor to measure soft tissue shear stiffness, aiding in the diagnosis of pathologies like tumors. The optimized sensor design enhances diagnostic accuracy for various medical conditions.

Keywords:
Finite element methodNon-destructive evaluationProbability of detectionSoft tissue mechanicsTorsional ultrasound

More Related Videos

Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound
07:41

Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound

Published on: January 7, 2019

8.3K
Ultrasonic Fatigue Testing in the Tension-Compression Mode
06:54

Ultrasonic Fatigue Testing in the Tension-Compression Mode

Published on: March 7, 2018

10.1K

Related Experiment Videos

Last Updated: Apr 28, 2026

A Methodological Protocol and Considerations for Transcranial Ultrasonic Stimulation in Exploratory Clinical Human Studies
09:47

A Methodological Protocol and Considerations for Transcranial Ultrasonic Stimulation in Exploratory Clinical Human Studies

Published on: December 12, 2025

643
Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound
07:41

Design and Implementation of a Bespoke Robotic Manipulator for Extra-corporeal Ultrasound

Published on: January 7, 2019

8.3K
Ultrasonic Fatigue Testing in the Tension-Compression Mode
06:54

Ultrasonic Fatigue Testing in the Tension-Compression Mode

Published on: March 7, 2018

10.1K

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Medical Diagnostics

Background:

  • Soft tissue shear stiffness is a critical indicator of pathologies such as tumors and hepatic lesions.
  • Current diagnostic tools for quantifying these changes are underdeveloped.
  • Tissue compressibility is primarily fluid-dependent, while shear stiffness reflects micro-architectural changes affected by disease.

Purpose of the Study:

  • To propose and computationally optimize a novel torsional piezoelectric ultrasonic sensor design.
  • To develop a method for optimizing sensor design using an analytical estimate of the Robust Probability Of Detection (RPOD).
  • To enhance the diagnostic capability for detecting soft tissue pathologies.

Main Methods:

  • A new sensor typology adapted for quasifluids was developed.
  • An analytical estimate of the Robust Probability Of Detection (RPOD) was formulated as an optimality criterion.
  • Computational testing and optimization were performed to refine the sensor design.

Main Results:

  • The optimized torsional piezoelectric ultrasonic sensor achieved a resonance frequency of 28 kHz.
  • The RPOD formulation successfully maximized the probability of detecting minimal pathologies while minimizing noise interference.
  • The sensor design is suitable for measuring shear stiffness properties in soft tissues.

Conclusions:

  • The proposed torsional piezoelectric ultrasonic sensor offers a promising new tool for non-invasively quantifying soft tissue shear stiffness.
  • The RPOD serves as an effective criterion for optimizing sensor design in diagnostic applications.
  • This technology has the potential to significantly improve the early detection and characterization of various soft tissue pathologies.