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

Masonry Cavity Walls01:26

Masonry Cavity Walls

Cavity walls feature a hollow space between the outer and inner wythes, connected only by corrosion-resistant metal ties. When water seeps through the outer wythe, it descends within this cavity, intercepted by flashing and eventually exiting through weep holes. To enhance moisture resistance, the inner wythe's cavity side often receives damp-proofing, doubling as an air barrier. The cavity can also house insulation to mitigate heat transfer.
Maintaining a clean cavity during construction is...
Composite Masonry Walls01:18

Composite Masonry Walls

Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
Soundness of Cement01:17

Soundness of Cement

The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create ettringite,...
Posttensioned Masonry Walls01:15

Posttensioned Masonry Walls


Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

You might also read

Related Articles

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

Sort by
Same author

Observation of the Radiative Decay D_{s0}^{*}(2317)^{+}→D_{s}^{*+}γ.

Physical review letters·2026
Same author

Gender-Based Differences in Clinical, Immunological and Disease Activity Profiles of Systemic Lupus Erythematosus Patients in Bangladesh.

Mymensingh medical journal : MMJ·2026
Same author

First Search for B→X_{s}νν[over ¯] Decays.

Physical review letters·2026
Same author

Search for Feebly Interacting Particles in B Decays with Missing Energy at Belle.

Physical review letters·2026
Same author

A prototype differential atom interferometer for fundamental physics.

Nature·2026
Same author

CITF1 interacts with FIT and regulates copper-iron crosstalk in Arabidopsis.

The Plant cell·2026

Related Experiment Video

Updated: Jun 21, 2026

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
11:34

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

A numerical study of defect detection in a plaster dome ceiling using structural acoustics.

J A Bucaro1, A J Romano, N Valdivia

  • 1Naval Research Laboratory, Washington, DC 20375, USA. bucaro@pa.nrl.navy.mil

The Journal of the Acoustical Society of America
|July 17, 2009
PubMed
Summary

Acoustic excitation effectively detects ceiling flaws using surface displacement mapping. This method can identify plaster detachments as small as 4 cm, aiding structural health monitoring.

More Related Videos

A Stable Phantom Material for Optical and Acoustic Imaging
04:54

A Stable Phantom Material for Optical and Acoustic Imaging

Published on: June 16, 2023

Related Experiment Videos

Last Updated: Jun 21, 2026

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
11:34

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

A Stable Phantom Material for Optical and Acoustic Imaging
04:54

A Stable Phantom Material for Optical and Acoustic Imaging

Published on: June 16, 2023

Area of Science:

  • Structural acoustics
  • Non-destructive testing
  • Computational mechanics

Background:

  • Assessing structural integrity of domed plaster ceilings is crucial.
  • Detecting subsurface flaws like detachment and deconsolidation presents challenges.
  • Non-destructive evaluation methods are sought for effective flaw detection.

Purpose of the Study:

  • To evaluate the effectiveness of acoustic excitation for detecting and localizing flaws in domed plaster ceilings.
  • To determine the minimum detectable flaw size using surface displacement measurements.
  • To differentiate between plaster detachment and deconsolidation defects.

Main Methods:

  • Numerical simulation using a parallel h-p structural acoustic finite element code.
  • Modeling three ceiling conditions: pristine, partial detachment, and deconsolidation.
  • Analyzing normal surface displacements from acoustic speaker excitation at 100-400 Hz.

Main Results:

  • Acoustic excitation generates detectable surface displacements using laser Doppler vibrometers.
  • Plaster detachments as small as 4 cm in 1-inch thick layers are detectable.
  • Distinct spatial displacement map structures observed for different defect types.

Conclusions:

  • Acoustic excitation is a viable method for non-destructive flaw detection in domed plaster ceilings.
  • Surface displacement mapping can identify small plaster detachments.
  • Wavenumber-based analysis of displacement maps may distinguish defect types.