Mr. Ruben Granados Profile

Ruben Granados

at California State Univ Northridge

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 9 May 2024 Presentation + Paper

Automated transducer deployment for Lamb wave-based nondestructive evaluation of plates

Christoph Schaal, Ruben Granados, Morgan Barrett, Kathryn Davis

Proceedings Volume 12951, 1295117 (2024) https://doi.org/10.1117/12.3009829

KEYWORDS: Transducers, Ultrasound transducers, Nondestructive evaluation, Signal processing, Prototyping, Aluminum, Robotics, Dispersion, Ultrasonics

Read Abstract +

Lamb wave-based inspection methods show promise in long range Nondestructive Evaluation (NDE) of thin metallic and composite plates. This NDE strategy is typically implemented in a pitch-catch configuration of one actuator and at least one sensor. Despite non-contact methods such as laser ultrasonics and air-coupled transducers, the most common approach relies on contact transducers. Transducer placement is usually performed manually and positional errors and variations in contact conditions are therefore inevitable. Thus, this study investigates the potential improvement in measurement reliability and repeatability through the use of an automated deployment system. The system is comprised of two subsystems: 1) A gel deployment subsystem to deposit the desired amount of couplant at the target location. 2) A transducer deployment subsystem to lower the transducer onto test article. In addition to a detailed description of the developed prototype systems, their combined reliability is demonstrated for experiments on an aluminum panel in a broad frequency range. The results are compared to those obtained via transducers positioned by multiple different human operators. These benchmark experiments are conducted with varying degree of aids, such as placement templates and weights. Furthermore, measurements from manual placement are processed both manually as well as automatically to further illustrate the need for fully automated NDE capabilities. It is shown that the automated prototype transducer deployment system not only reduces manual labor but achieves slightly improved repeatability as compared to an experienced human operator with positioning aids.

Proceedings Article | 19 April 2022 Paper

Recent advancements on autonomous Lamb wave-based nondestructive inspection

Christoph Schaal, Alvin Miranda, Kevin Yanik, Ruben Granados

Proceedings Volume 12048, 120480D (2022) https://doi.org/10.1117/12.2613463

KEYWORDS: Inspection, Robots, Robotics, Nondestructive evaluation, Wave plates, Edge detection

Read Abstract +

In order to support the continued trend of increased use of composite materials especially in aviation, efficient testing systems need to be developed. The anisotropic material properties of composites allow for high specific stiffnesses and strengths. However, some failure modes in composite structures cannot be identified through visual inspection and to ensure the health of the structures, a time-consuming and costly inspection approach must be taken. Often, this approach includes disassembly and premature part replacements. Thus, complete nondestructive inspection (NDI) and monitoring of composite structures in aviation is virtually nonexistent. Hence, there is a need to introduce an autonomous inspection method to reduce time and cost, while increasing aircraft reliability. To this end, several recent advancements of a mobile robotic platform and related algorithms for Lamb wave-based inspection of aircraft surfaces are presented here. The robots are envisioned to be operated in a low cardinality swarm, where each robot employs guided ultrasound technology to collaboratively inspect plate-like components. For the purpose of implementing a fully autonomous platform, simultaneous localization and mapping (SLAM) methods are combined with Lamb wave-based NDI techniques. Specifically, it is demonstrated that a novel Lamb wave-based edge seeking and tracing methodology can contribute to increasing testing efficiency, with the overarching goal of creating a full map of the tested structure including all potential flaws.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years