The influence of the sensor position on the quality of the vibration measurement of rotating machinery on flexible supports

2016 ◽  
Author(s):  
Bouzaouit Azzedine ◽  
Rahai Lias ◽  
Zahzouh Zoubir ◽  
Gahgah Mounir
Keyword(s):  
Rotating Machinery ◽  
Vibration Measurement ◽  
Sensor Position ◽  
Flexible Supports

The Mechanical Design of Large Turbogenerators

1987 ◽  
Vol 201 (2) ◽  
pp. 91-103
Author(s):  
B A Marlow
Keyword(s):  
High Speed ◽  
Mechanical Design ◽  
Rotating Machinery ◽  
Design Problems ◽  
Detail Design ◽  
Insight Into

Experience shows that the reliability of large turbogenerators depends substantially on the quality of detail design, particularly the quality of the mechanical design. In addition to the design problems common to all high-speed rotating machinery, the mechanical design of generators must take account of certain electrical requirements. This paper gives an insight into the detail mechanical design of large turbogenerators paying particular attention to the interaction of electrical requirements on the mechanical design.

scholarly journals Accuracy and Reproducibility of Acoustic Tomography Significantly Increase with Precision of Sensor Position

2017 ◽  
Vol 2 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Steffen Rust
Keyword(s):  
Risk Assessment ◽  
Norway Spruce ◽  
Cross Sections ◽  
Acoustic Tomography ◽  
Model Operator ◽  
Sensor Position ◽  
Complex Shapes ◽  
Source Of Error ◽  
Sensor Positions

Acoustic tomograms are widely used in tree risk assessment. They should be accurate,repeatable and comparable between consecutive measurements. Previous work has failed to address the effects of different approaches to record sensor positions, operators and models of tomograph on the resulting tomograms.In this study, three operators used the two most common sonic tomographmodels to measure seven cross-sections of Norway spruce trees, whichwere felled after the measurement. We evaluated the effects of model, operator, and different approaches to measure sensor positions on the quality of the tomograms.The largest source of error was the position of sensors, affectingestimated stress wave velocity, the shape of the tomogram, and the sizeof the defect.To produce accurate and repeatable tomograms of trees with complex shapes,it is essential to measure the sensor positions precisely.

scholarly journals Fault Diagnosis for Rotating Machinery Using Vibration Measurement Deep Statistical Feature Learning

Sensors ◽  
2016 ◽  
Vol 16 (6) ◽  
pp. 895 ◽  
Author(s):  
Chuan Li ◽  
René-Vinicio Sánchez ◽  
Grover Zurita ◽  
Mariela Cerrada ◽  
Diego Cabrera
Keyword(s):  
Fault Diagnosis ◽  
Feature Learning ◽  
Rotating Machinery ◽  
Vibration Measurement ◽  
Statistical Feature

The Optimization on Grid Division Methods of Blade Pump Blades Based on CFD

2014 ◽  
Vol 635-637 ◽  
pp. 35-39
Author(s):  
Dang Qin Xue ◽  
De Yong Lv ◽  
Jia Xi Zhang ◽  
Shu Lin Hou
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Efficiency ◽  
Rotating Machinery ◽  
Structured Grid ◽  
Engineering Problems ◽  
And Performance ◽  
Grid Division ◽  
Blade Pump

Grid division is the geometric expression forms and vectors of CFD numerical simulation engineering problems. The quality of the grid has an important impact on the CFD accuracy and computational efficiency about CFD. In this paper, it compares the structured and non-structured grid process summary base on blade pump. During a large number of mechanical fluid grid division and performance calculations, and combining with the theoretical guidance based on rotating machinery fluid Dynamics calculations, it summarizes some experience and practice on blades grid division optimization.

End-Point Control of Holding Phase Based on Cavity Pressure for Injection Molding

2011 ◽  
Vol 221 ◽  
pp. 333-337
Author(s):  
Jian Wang ◽  
Peng Cheng Xie ◽  
Wei Min Yang
Keyword(s):  
Injection Molding ◽  
Control Method ◽  
Holding Time ◽  
Control Mode ◽  
Cavity Pressure ◽  
End Point ◽  
Sensor Position ◽  
Molded Parts ◽  
Point Control

While the switchover from filling to packing is particularly crucial during injection molding, the transfers from holding to screw recovery also significantly affects the quality of molded parts. In this study, the end-point control of the holding phase based on cavity pressure was presented. It was compared with the traditional control method by holding time. The purpose of this study was to validate the feasibility of the end-point control of holding phase by cavity pressure, and to examine its consistency. The weight of the molded parts served as the main measure to probe the process’s capabilities. The results of the verification experiments revealed that the end-point control mode based on cavity pressure could yield better consistency of part weight than the traditional control method by holding time, however, the benefits were not significant. The trigger value of cavity pressure and sensor position should be considered for achieving such high process capabilities.

Design of Photon Beam Vibration Measurement System for the CLS HXMA Beamline

2010 ◽  
Author(s):  
J. W. Li ◽  
X. B. Chen ◽  
E. Matias ◽  
W. J. Zhang
Keyword(s):  
Measurement System ◽  
Vibration Isolation ◽  
Poor Quality ◽  
Vibration Measurement ◽  
Beam Size ◽  
Photon Beams ◽  
Detailed Design ◽  
Beam Vibration ◽  
X Ray

At synchrotron radiation facilities vibration is often a problem causing poor quality of photon beams. At the Canadian Light Source (CLS) Hard X-ray MicroAnalysis (HXMA) beamline, the MicroProbe endstation is particularly sensitive to vibrations since very small beam size (∼ 3μm × 5μm) is required. Thus, a measurement system is desired to investigate vibrations of the X-ray beam at HXMA beamline. This paper presents a design of such a X-ray beam vibration measurement system. The system consists of two sub-systems: (a) measurement system and (b) vibration-isolation platform. Mathematical models are developed and detailed design is conducted. The design is numerically investigated and it shows very promising results.

Vibration Measurements on Rotating Machinery Using Laser Doppler Velocimetry

1994 ◽  
Vol 116 (3) ◽  
pp. 326-331 ◽  
Author(s):  
S. J. Rothberg ◽  
N. A. Halliwell
Keyword(s):  
Velocity Component ◽  
Laser Doppler Velocimetry ◽  
Rotating Machinery ◽  
Vibration Measurement ◽  
Surface Velocity ◽  
Laser Vibrometer ◽  
Doppler Velocimetry ◽  
Laser Vibrometry ◽  
Vibration Measurements ◽  
Measurement Direction

This paper explores the use of laser vibrometry for vibration measurement directly from a rotating component. The presence of a surface velocity component due to the rotation itself is shown to create a strong measurement dependency on vibration perpendicular to the intended measurement direction. Particular ambiguity results at synchronous frequencies. A mathematical means to resolve the genuine vibration components from two simultaneous laser vibrometer measurements is presented and shown to be effective in the study of nonsynchronous rotor vibrations.

639 Blade-Shaft Vibration Measurement in Rotating Machinery

2008 ◽  
Vol 2008 (0) ◽  
pp. _639-1_-_639-6_ ◽  
Author(s):  
Norihisa ANEGAWA ◽  
Hiroyuki FUJIWARA ◽  
Osami MATSUSHITA
Keyword(s):  
Rotating Machinery ◽  
Vibration Measurement ◽  
Shaft Vibration
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