Vibro-acoustic analysis of the acoustic-structure interaction of flexible structure due to acoustic excitation

Djojodihardjo, Harijono

doi:10.1016/j.actaastro.2014.11.026

Cited by 20 publications

(5 citation statements)

References 14 publications

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“…Following a series of previous investigation on the analysis of impact resilient structure [1][2][3][4], the objective of this work is to carry out vibration analysis of an elastic clamped cantilever beam structures with a spring attached at the end, as depicted in Fig. 1.…”

Section: Problem Formulationmentioning

confidence: 99%

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Vibration Analysis of a Cantilevered Beam with Spring Loading at the Tip as a Generic Elastic Structure

Jafari

Djojodihardjo

Ahmad

2014

AMM

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Although fundamental, vibration of a cantilevered Euler-Bernoulli beam with spring attached at the tip is not found in literatures and is here solved analytically and numerically using finite element approach. The equation of motion of the beam is obtained by using Hamilton’s principle. Finite element method is utilized to write in-house program for the free vibration of the beam. Results show plausible agreements.

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Section: Problem Formulationmentioning

confidence: 99%

“…Studies of vibrating beams and plates have a wide variety of applications in mechanical engineering, aeronautical and civil structures [1][2][3][4][5][6]. For instructiveness, structures might be analyzed starting from simplified configurations.…”

Section: Introductionmentioning

confidence: 99%

Vibration Analysis of a Cantilevered Beam with Spring Loading at the Tip as a Generic Elastic Structure

Jafari

Djojodihardjo

Ahmad

2014

AMM

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“…We use a Finite Element Model to explore the vibroacoustic response of the HDD's individual mechanical parts (a common use for Finite Element Models [12], [13]). We investigate how sufficiently powerful acoustic waves and vibration lead to throughput loss.…”

Section: A Vulnerable Hard Disk Drive Mechanicsmentioning

confidence: 99%

Blue Note: How Intentional Acoustic Interference Damages Availability and Integrity in Hard Disk Drives and Operating Systems

Bolton

Rampazzi

et al. 2018

2018 IEEE Symposium on Security and Privacy (SP)

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Intentional acoustic interference causes unusual errors in the mechanics of magnetic hard disk drives in desktop and laptop computers, leading to damage to integrity and availability in both hardware and software such as file system corruption and operating system reboots. An adversary without any special purpose equipment can co-opt built-in speakers or nearby emitters to cause persistent errors. Our work traces the deeper causality of these risks from the physics of materials to the I/O request stack in operating systems for audible and ultrasonic sound. Our experiments show that audible sound causes the head stack assembly to vibrate outside of operational bounds; ultrasonic sound causes false positives in the shock sensor, which is designed to prevent a head crash.The problem poses a challenge for legacy magnetic disks that remain stubbornly common in safety critical applications such as medical devices and other highly utilized systems difficult to sunset. Thus, we created and modeled a new feedback controller that could be deployed as a firmware update to attenuate the intentional acoustic interference. Our sensor fusion method prevents unnecessary head parking by detecting ultrasonic triggering of the shock sensor.

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“…However, the coupled FEM/BEM model also suffers from the fully populated matrices and leads to a heavy burden in both memory consumption and computing time [17]. To solve the problem, the finite element/fast multipole boundary element (FE/FMBE) [18] coupling formulation and other improved methods [19][20][21][22] have been employed to analyze acoustic-structure coupled problems. Though such inherent drawbacks are got settlement to some extent, there are still some imperfections that need to be improved when extending these methods to practical engineering applications.…”

Section: Introductionmentioning

confidence: 99%

An accurate and efficient scheme for acoustic-structure interaction problems based on unstructured mesh

Cui

Wang

et al. 2017

Computer Methods in Applied Mechanics and Engineering

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This paper focuses on the accurate and efficient numerical implementation of acoustic-structure coupling formulations using the edge-based smoothed finite element method for the flexible shell and the gradient-weighted finite element method for the acoustic fluid field, namely, the ES/GW-FEM. The shell is discretized using the simplest linear triangular elements and the edge-based smoothing domain is then constructed. By introducing an edge local coordinate system, the edge-based smoothing operation is performed on the smoothing domain. As for the acoustic fluid domain, the tetrahedron elements are adopted. A compacted support domain is then constructed and the gradient weighted operation is performed on the support domain. To model the exterior acoustic domain, an artificial boundary is introduced and the Dirichlet-to-Neumann (DtN) boundary condition is imposed. Based on the appropriate compatibility and equilibrium conditions on the interface boundaries, the coupled ES/GW-FEM formulation is finally obtained. Both the interior acoustic-structure coupled problems and exterior acoustic-structure coupled problems are available as the DtN boundary is considered. Numerical examples demonstrate that the coupled ES/GW-FEM achieves much higher accuracy and works more reliable compared with the coupled FEM/FEM in solving practical engineering problems.

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Vibro-acoustic analysis of the acoustic-structure interaction of flexible structure due to acoustic excitation

Cited by 20 publications

References 14 publications

Vibration Analysis of a Cantilevered Beam with Spring Loading at the Tip as a Generic Elastic Structure

Vibration Analysis of a Cantilevered Beam with Spring Loading at the Tip as a Generic Elastic Structure

Blue Note: How Intentional Acoustic Interference Damages Availability and Integrity in Hard Disk Drives and Operating Systems

An accurate and efficient scheme for acoustic-structure interaction problems based on unstructured mesh

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