Detailed Measurement of Gear's All Tooth Surface Form for the Detection of Non-integer Order of Mesh Vibration

2000 ◽  
Vol 2000.2 (0) ◽  
pp. 343-344
Author(s):  
Atsushi KITAHARA
Keyword(s):  
Tooth Surface ◽  
Surface Form ◽  
Detailed Measurement ◽  
Integer Order

Observation of Ghost Noise on Ground Gears With Vibration Measurement and Detection of Surface Undulation

2000 ◽  
Author(s):  
Shigeki Matsumura ◽  
Haruo Houjoh ◽  
Shun-ichi Ohshima ◽  
Hiroaki Nagoya
Keyword(s):  
Spectrum Analysis ◽  
Transmission Error ◽  
Entropy Method ◽  
Vibration Measurement ◽  
Tooth Surface ◽  
Integer Order ◽  
Tooth Surfaces ◽  
Surface Deviation ◽  
Surface Undulation ◽  
Helical Gear Pair

Abstract In this research, we discuss about the peculiar vibration behavior of a helical gear pair that appears at non-integer order of the meshing frequency. It is supposed that the vibration is generated because of the undulation on tooth surfaces having different cycles of transmission error from tooth mesh cycle. But, it is difficult to detect the undulation with direct measurement of tooth shapes because its amplitude is very small and the length of measured tooth profile is relatively short for spectrum analysis. At first, characteristics of tooth surface undulation are discussed with spectra of measured gear vibration. It makes clear that there are integer order surface undulation components of gear rotation. Next, possibility of the spectrum analysis of measured tooth surface deviation is also discussed using Maximum Entropy Method.

Tooth Surface Form of Conical Involute Gears on Faigue Test

2003 ◽  
Vol 2003.3 (0) ◽  
pp. 65-66
Author(s):  
Michinari FUKUOKA ◽  
Tatsuya OHMACHI ◽  
Kenichi MITOME
Keyword(s):  
Tooth Surface ◽  
Surface Form ◽  
Involute Gears

Utilization of Synchronous Averaging of Vibration for Diagnosis of Gear System to Estimate Tooth Error

2003 ◽  
Author(s):  
Chanat Ratanasumawong ◽  
Haruo Houjoh ◽  
Shigeki Matsumura ◽  
Michio Saitoh ◽  
Yasushi Ueda
Keyword(s):  
Noise Source ◽  
Gear System ◽  
Tooth Surface ◽  
Gear Pair ◽  
Integer Order ◽  
Vibration Behavior ◽  
Surface Measurements ◽  
Diagnosis Method

Generally, gear vibration behavior has base frequencies equal to meshing frequency and its harmonics. But it has become known that slight undulation even on ground gear surface sometimes generate peculiar vibration behavior that is non-integer order of meshing frequency, and it is called ‘ghost noise’. In the normal cases, the gear pair that is the source of vibration can be located by considering mesh frequencies of each gear pair and their harmonics. But if ghost noise components exist, it becomes difficult to detect which gear pair is the source. Therefore diagnosis method to detect ghost noise source with measuring vibration is required. In this study, we proposed the utilization of synchronous averaging to distinguish the source of ghost noise components. With this method, we could separate the effect of driving and driven gear from each other. The estimation results with synchronous averaging were verified with precise tooth surface measurements.

scholarly journals Detection of Tooth Surface Form Irregularity by Means of Vibration Measurement.

1999 ◽  
Vol 65 (632) ◽  
pp. 1635-1641 ◽  
Author(s):  
Shigeki MATSUMURA ◽  
Haruo HOUJOH ◽  
Hiroaki NAGOYA ◽  
Kiyohiko UMEZAWA
Keyword(s):  
Vibration Measurement ◽  
Tooth Surface ◽  
Surface Form

Intravascular ultrasound in the diagnosis and treatment of central venous diseases

VASA ◽  
2021 ◽  
Vol 50 (1) ◽  
pp. 2-10 ◽  
Author(s):  
Xin Li ◽  
Giuseppe D’Amico ◽  
Cristiano Quintini ◽  
Teresa Diago Uso ◽  
Sameer Gadani ◽  
...  
Keyword(s):  
Intravascular Ultrasound ◽  
Patient Outcomes ◽  
Controlled Trials ◽  
Ivc Filter ◽  
Venous Anatomy ◽  
Central Venous ◽  
Detailed Measurement ◽  
Filter Placement ◽  
Randomized Controlled ◽  
Venous Diseases

Summary: Intravascular ultrasound (IVUS) has been used extensively in coronary applications. Its use in venous applications has increased as endovascular therapy has increasingly become the mainstay therapy for central venous diseases. IVUS has been used for both diagnostic and therapeutic purposes in managing venous stenotic disease, venous occlusive disease, and IVC filter placement and removal. IVUS has been proven to be effective in providing detailed measurement of the venous anatomy, which aid in determining the appropriate size and the approach for venous stent placement. In IVC filter placement, IVUS can provide detailed measurement and guide IVC filter placement in emergent and critical care settings. It also has certain utility in filter removal. At any rate, to date there are only a few studies examining its impact on patient outcomes. Prospective randomized controlled trials are warranted in the future.

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