DYNAMIC CHARACTERIZATION OF BALL BEARING IN TURBINE PROPELLER USING BUMP TEST METHOD

Bearing is an essential component in a mechanical rotating equipment system. It is no less important than lubrication to prevent wear is very important to consider in the mechanical maintenance system of rotating equipment. Bearing wear is one of the problems in wind turbines that will increase maintenance costs, shorten the wind turbines' lifespan, and cause the component or overall damage to the wind turbine. The latest technology has provided instruments for analyzing the damage of elements in a bearing according to the caused vibrations. Therefore, this study was performed on Ball Bearing Turbine Propeller to identify the dynamic characteristics of Ball Bearing with and without lubrication. The test was carried out using the Bump Test method applied in three measured parts: X, Y, and Z axes. The measuring instrument which was used was Fast Fourier Transform (FFT) Analyzer (Ono Sokki) and the data were analyzed using MATLAB. It was identified that the application of oil could reduce the amplitude and decrease the frequency. Personal frequency appearing more than once indicates the existence of global vibration modes. The frequency which only appears once in the measurement spot indicates local vibration modes. The highest frequency both after and before the application of oil was found in the Y-axis.

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Dynamic characterization of elastomer buffer under impact loading by low-velocity drop test method

Polymer Testing ◽

10.1016/j.polymertesting.2019.106013 ◽

2019 ◽

Vol 79 ◽

pp. 106013 ◽

Cited By ~ 8

Author(s):

Ahmet Meram

Keyword(s):

Impact Loading ◽

Test Method ◽

Drop Test ◽

Dynamic Characterization ◽

Low Velocity

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Experimental implementation of test method for dynamic characterization of DAC based on over sampling and low resolution ADC

2010 IEEE Instrumentation & Measurement Technology Conference Proceedings ◽

10.1109/imtc.2010.5488006 ◽

2010 ◽

Cited By ~ 3

Author(s):

A. Baccigalupi ◽

A. Liccardo ◽

D.L. Carni ◽

D. Grimaldi

Keyword(s):

Test Method ◽

Dynamic Characterization ◽

Low Resolution ◽

Experimental Implementation

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Experimental Dynamic Characterization of Operating Wind Turbines with Anisotropic Rotor

Conference Proceedings of the Society for Experimental Mechanics Series - Dynamics of Civil Structures, Volume 2 ◽

10.1007/978-3-319-29751-4_14 ◽

2016 ◽

pp. 131-143

Author(s):

Dmitri Tcherniak ◽

Matthew S. Allen

Keyword(s):

Wind Turbines ◽

Dynamic Characterization

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Footwear. Test method for the characterization of elastic materials. Tensile performance

10.3403/30181876 ◽

2010 ◽

Keyword(s):

Test Method ◽

Elastic Materials ◽

Tensile Performance

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Characterization of Antibacterial-Producing Endophytic Fungi of Syzygiumpolyanthum Leaves

Infectious Disorders - Drug Targets ◽

10.2174/1871526519666181226123541 ◽

2020 ◽

Vol 20 (4) ◽

pp. 448-454

Author(s):

Rahmita Burhamzah ◽

Gemini Alam ◽

Herlina Rante

Keyword(s):

Molecular Characterization ◽

Endophytic Fungi ◽

Morphological Characterization ◽

Test Method ◽

Analysis Method ◽

Nitrogen Base ◽

Rdna Genes ◽

Antibacterial Screening ◽

Planting Method

Background: Endophytic fungi live in plants’ tissue and can produce the same bioactive compounds as its host plant produces. Syzygiumpolyanthum leaves have known to be one of the antibacterial compound producers. Aim and Objective: This study aimed to characterize morphologically, microscopically, and molecularly the antibacterial-producing endophytic fungi of Syzygiumpolyanthum leaves. Methods: The isolation of endophytic fungi was done by fragment planting method on PDA medium. The antibacterial screening was performed using the antagonistic test as the first screening followed by the disc diffusion test method. The morphological characterization was based on isolate’s mycelia color, growth pattern, margin, and surface texture of the colony, while the microscopic characterization was based on its hyphae characteristics. The molecular characterization of the isolate was done by nitrogen base sequence analysis method on nucleotide constituent of ITS rDNA genes of the isolate. Results: The results found that isolate DF1 has antibacterial activity against E.coli, S.aureus, P.acne, and P.aeruginosa, with the greatest inhibition at 10% concentration of broth fermentation extract on S.aureus with a diameter of inhibition of 13.77 mm. Conclusion: Based on macroscopic, microscopic, and molecular characterization, DF1 isolate is similar to Ceriporialacerate.

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Infrared Spectroscopy Characterization of Marine Shells

MRS Proceedings ◽

10.1557/proc-711-hh3.49.1 ◽

2001 ◽

Vol 711 ◽

Author(s):

Octavio Gomez-Martinez ◽

Daniel H. Aguilar ◽

Patricia Quintana ◽

Juan J. Alvarado-Gil ◽

Dalila Aldana ◽

...

Keyword(s):

Fourier Transform ◽

Infrared Spectroscopy ◽

Crassostrea Virginica ◽

Thermal Treatments ◽

Vibration Modes ◽

Lattice Vibrations ◽

Vibration Frequencies ◽

Mussel Shells ◽

Carbonate Lattice

ABSTRACTFourier Transform infrared spectroscopy has been employed to study the shells of two kind of mollusks, American oysters (Crassostrea virginica) and mussels (Ischadium recurvum). It is shown that it is possible to distinguish the different calcium carbonate lattice vibrations in each case, mussel shells present aragonite vibration frequencies, and the oyster shells present those corresponding to calcite. The superposition, shift and broadening of the infrared bands are discussed. Changes in the vibration modes due to successive thermal treatments are also reported.

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