A study of the internal vibration of a single oscillating bubble

Y. Q. Yu; Z. Zong

doi:10.1063/5.0055365

Aero/Aeroderivative Engines: Internal Transducers Offer Potential for Enhanced Condition Monitoring and Vibration Diagnostics

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; General ◽

10.1115/90-gt-273 ◽

1990 ◽

Author(s):

Malcolm J. Werner

Keyword(s):

Gas Turbine ◽

Condition Monitoring ◽

Internal Vibration ◽

Vibration Diagnostics ◽

Diagnostic Data ◽

Aero Engines

Gas turbine aero engines and their ground based derivatives can benefit greatly from the enhanced condition and diagnostic data available from internal vibration transducers. This paper discusses transducer selection, illustrates typical transducer locations and mounting, and describes some of the rotor malfunctions that can be diagnosed from the vibrations data.

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Locating Faulty Planet Gears Using External Vibration Measurements

International Journal of Condition Monitoring ◽

10.1784/204764293664683623 ◽

2019 ◽

Vol 9 (1) ◽

pp. 14-17

Author(s):

D Peng ◽

W A Smith ◽

R B Randall

Keyword(s):

Vibration Signal ◽

Processing Technique ◽

Operating Conditions ◽

Internal Vibration ◽

Signal Processing Technique ◽

Vibration Measurements ◽

External Vibration ◽

Gear Mesh ◽

Mesh Phasing ◽

Planet Carrier

In this study, a mesh phasing-based approach is developed to locate the positions of faulty planet gears using external vibration measurements. Previous studies have illustrated how this can be achieved using internal vibration measurements recorded from a sensor placed on the planet carrier. It was shown in these studies that the timing of identifiable fault symptoms in the vibration signal relative to the phase of the gear-mesh component depends on which of the planet gears carries a fault. A signal processing technique is then developed to locate the position of a spalled gear using internal vibration measurements. However, internally mounted sensors are not commonly used in planetary gearboxes and it is much more convenient to mount sensors externally, for example on the gearbox casing. Therefore, this study extends the concept of using mesh phasing relationships to locate faulty planet gears, this time using external vibration measurements. The updated procedure is validated using experimental data collected from a test-rig running under a range of operating conditions. The results show that the updated procedure is able to identify the locations of faulty planet gears so long as an absolute phase reference (for example from a tachometer) of the planet carrier is available.

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Intermolecular interaction and infra-red spectra of the three crystalline phases of potassium nitrate—I. Internal vibration region

Journal of Physics and Chemistry of Solids ◽

10.1016/0022-3697(68)90124-8 ◽

1968 ◽

Vol 29 (3) ◽

pp. 475-480 ◽

Cited By ~ 25

Author(s):

S.V. Karpov ◽

A.A. Shultin

Keyword(s):

Intermolecular Interaction ◽

Potassium Nitrate ◽

Internal Vibration ◽

Crystalline Phases ◽

Infra Red

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Influence of internal vibration modes on the stability of haptic rendering

2008 IEEE International Conference on Robotics and Automation ◽

10.1109/robot.2008.4543647 ◽

2008 ◽

Cited By ~ 6

Author(s):

Inaki Diaz ◽

Jorge Juan Gil

Keyword(s):

Haptic Rendering ◽

Vibration Modes ◽

Internal Vibration ◽

The Stability

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Engine cover with internal vibration damping plates

The Journal of the Acoustical Society of America ◽

10.1121/1.1948258 ◽

2005 ◽

Vol 117 (6) ◽

pp. 3355

Author(s):

Alan S. Miller ◽

Paolo Comello

Keyword(s):

Vibration Damping ◽

Internal Vibration

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Internal vibration and the lateral pressure exerted by fresh concrete

Canadian Journal of Civil Engineering ◽

10.1139/l79-071 ◽

1979 ◽

Vol 6 (4) ◽

pp. 592-600 ◽

Cited By ~ 8

Author(s):

N. J. Gardner ◽

A. R. Quereshi

Keyword(s):

Experimental Investigation ◽

United Kingdom ◽

Lateral Pressure ◽

Fresh Concrete ◽

American Concrete Institute ◽

Experimental Results ◽

Internal Vibration ◽

Low Friction ◽

Design Recommendations ◽

Vibration Parameters

The design of formwork for vertical surfaces is dependent upon the magnitude of the lateral pressure assumed to act on the form face. This paper describes an experimental investigation to determine the variation of the lateral pressure exerted by fresh concrete with depth of immersion of the vibrator, duration of vibration, and power of the vibrator while keeping the rate of pour, form dimensions, and slump nominally constant and measuring the temperature.It was concluded that the lateral pressure is dependent upon the vibration parameters of depth of immersion of the vibrator, duration of vibration, and power of the vibrator and varies inversely with the temperature of the concrete mix.The experimental results were compared with the CIRIA (Civil Industries Research and Information Association, United Kingdom) and ACI (American Concrete Institute) design recommendations. It was concluded that the CIRIA arching criterion should be used with caution as it was not conservative for low friction formwork surfaces, and that both the CIRIA stiffening criterion and the ACI recommendations are conservative.

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