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Maruyama Lab
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A nondestructive evaluation lab that uses ultrasound to detect flaws in structures.
AboutAbout the lab
Finding flaws in structures with sound waves
The Maruyama Lab studies nondestructive evaluation techniques that use ultrasound to inspect structures and machines for flaws.
Using numerical simulation, the lab investigates how waves propagate through solids and how they scatter at cracks and voids.
The lab works on nonlinear ultrasonic methods for detecting closed cracks and on the use of guided waves that travel long distances along slender structures.
Research draws on mathematics, physics, and programming, and centers on theory and numerical analysis.
Key terms
- Nondestructive evaluation
- Examining internal flaws and the degree of deterioration without breaking or cutting the object
- Guided waves
- Sound or ultrasonic waves that travel long distances along slender structures such as plates, rods, and pipes
- Nonlinear ultrasonic method
- A method that applies large-amplitude ultrasound and detects flaws from the characteristic waves generated when crack faces come into contact
NewsLab news
Paper co-authored with Birla University in India published in J. Vib. Control
Alumnus receives the Academic Encouragement Award from the Japanese Society for Non-Destructive Inspection
Undergraduate student receives the Institute of Science Tokyo Outstanding Student Award (Tsubame Award)
Master's student receives the Institute of Science Tokyo Outstanding Master's Thesis Award
ResearchResearch themes
Aiming to develop technologies for assessing the integrity of structures and machines, the lab studies nondestructive evaluation and monitoring techniques using (ultra)sonic waves. It uses numerical simulation to clarify how sound waves propagate and scatter in solids.
*Illustrative imageUltrasound for Detecting Closed Cracks
In a closed crack, whose opposing faces are in contact, ultrasound can pass straight through without producing a reflected wave, so the crack may be overlooked or its depth underestimated. Using numerical simulation, the lab studies a method that applies large-amplitude ultrasound to cause vibration with contact between the crack faces, and detects the crack from the nonlinear ultrasound generated there.
*Illustrative imageNondestructive Evaluation with Guided Waves
Guided waves traveling along long structures such as plates, rods, and pipes reach far with little attenuation. Besides applying them to inspection over long distances and at hard-to-access locations, the lab is developing a technique to detect leaks in large-diameter water supply pipes from manhole locations.
MembersFaculty
The Maruyama Lab consists of faculty members and doctoral, master's, and undergraduate students.As of 2026
- Associate ProfessorTaizo MaruyamaPublications ↗
- Project Associate ProfessorElwin van't Wout
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Seiun Bridge, Yamashiro” Navian / Public domain (cropped)
- Ultrasound for Detecting Closed Cracks: “Cracked crank shaft” Dandersound / CC BY-SA 4.0 (cropped)
- Nondestructive Evaluation with Guided Waves: “Absperrschieber Wasserleitung” Dergreg / CC BY 2.0 (cropped)
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