Feasibility Analysis for the Rotordynamic Performance of API617

2003 ◽  
Author(s):  
Hyeong-Joon Ahn ◽  
Eric H. Maslen ◽  
Tetsuya Iwasaki
Keyword(s):  
Transfer Functions ◽  
Control Design ◽  
Rolling Element Bearings ◽  
Worst Case ◽  
Direct Assessment ◽  
Rolling Element ◽  
Speed Range ◽  
Direct Guidance ◽  
Bearing Dynamics ◽  
Selection Of

The rotordynamic performance of API 617 standards provides two primary requirements. First, the standard stipulates system damping near the expected operating speed range. Second, the standard requires a specific bound of the worst case unbalance response. The problem this poses for machine designers is 1) feasibility: can bearings be designed for a given rotor to meet API 617 and 2) if so, how can these bearings be designed? Our primary effort in this research is to convert the API requirements to a control design objective for a bearing. This permits direct assessment of the feasible design problem as well as providing a means to synthesize optimal bearing dynamics. In addition to providing synthesis of magnetic bearings, the resulting bearing transfer functions give direct guidance to selection of more conventional fluid film or rolling element bearings.

Feasibility Analysis for the Rotordynamic Performance of API617

2005 ◽  
Vol 127 (2) ◽  
pp. 418-424 ◽  
Author(s):  
Hyeong-Joon Ahn ◽  
Eric H. Maslen ◽  
Tetsuya Iwasaki
Keyword(s):  
Transfer Functions ◽  
Control Design ◽  
Rolling Element Bearings ◽  
Worst Case ◽  
Direct Assessment ◽  
Rolling Element ◽  
Speed Range ◽  
Direct Guidance ◽  
Bearing Dynamics ◽  
Selection Of

The rotordynamic performance of API 617 standards provides two primary requirements. First, the standard stipulates system damping near the expected operating speed range. Second, the standard requires a specific bound of the worst case unbalance response. The problem this poses for machine designers is (1) feasibility: can bearings be designed for a given rotor to meet API 617 and (2) if so, how can these bearings be designed? Our primary effort in this research is to convert the API requirements to a control design objective for a bearing. This permits direct assessment of the feasible design problem as well as providing a means to synthesize optimal bearing dynamics. In addition to providing synthesis of magnetic bearings, the resulting bearing transfer functions give direct guidance to selection of more conventional fluid film or rolling element bearings.

An Intelligent Real Time Design Methodology for Component Selection: An Approach to Managing Uncertainty

1994 ◽  
Vol 116 (4) ◽  
pp. 980-988 ◽  
Author(s):  
S. R. Bradley ◽  
A. M. Agogino
Keyword(s):  
Real Time ◽  
Design Methodology ◽  
Limited Resources ◽  
Rolling Element Bearings ◽  
Component Selection ◽  
Rolling Element ◽  
Improved Design ◽  
The Cost ◽  
Component Database ◽  
Selection Of

An Intelligent Real Time Design (IRTD) methodology is presented for component selection applications under the reality of uncertain and incomplete information. A decision analytic approach is developed with the goal of assisting designers in making decisions that balance the cost of the limited resources consumed during the design process, such as the designer’s time, against the benefit to be derived from the utilization of those resources in terms of expectations of an improved design. This approach is shown to complement other formal methods for design based on interval arithmetic and qualitative optimization, and a general methodology is proposed for performing component selection utilizing a combination of these methods. An example application to the selection of rolling element bearings is presented to clarify the methodology and demonstrate its effectiveness in providing guidance to designers when selecting elements from a component database.

A PEAK ENERGY CRITERION (P. E.) FOR THE SELECTION OF RESONANCE BANDS IN COMPLEX SHIFTED MORLET WAVELET (CSMW) BASED DEMODULATION OF DEFECTIVE ROLLING ELEMENT BEARINGS VIBRATION RESPONSE

2009 ◽  
Vol 07 (04) ◽  
pp. 387-410 ◽  
Author(s):  
KONSTANTINOS C. GRYLLIAS ◽  
IOANNIS ANTONIADIS
Keyword(s):  
Energy Criterion ◽  
Vibration Response ◽  
Frequency Resolution ◽  
Center Frequency ◽  
Index Number ◽  
Rolling Element Bearings ◽  
Time Frequency ◽  
Peak Energy ◽  
Rolling Element ◽  
Selection Of

Complex Shifted Morlet Wavelets (CSMW) present a number of advantages when used for the demodulation of the vibration response of defective rolling element bearings: (A) They present the optimally located window simultaneously in the time and in the frequency domains; (B) They allow for the maximal time-frequency resolution; (C) The magnitudes of the complex wavelet coefficients in the time domain lead directly to the required envelope; (D) They allow for the optimal selection of both the center frequency and the bandwidth of the requested filter. A Peak Energy criterion (P. E.) is proposed in this paper for the simultaneous automatic selection of both the center frequency and the bandwidth of the relevant wavelet window to be used. As shown in a number of application cases, this criterion presents a more effective behavior than other criteria used (Crest Factor, Kurtosis, Smoothness Index, Number of Peaks), since it combines the advantages of energy based criteria, with criteria characterizing the spikiness of the response.

scholarly journals Commissioning of a High Speed Composite Rotor With Hydrostatic Dampers and Ceramic Rolling Element Bearings

1993 ◽  
Author(s):  
Ross N. Headifen ◽  
Robert L. Fuller ◽  
Jon R. Kitzmiller
Keyword(s):  
High Speed ◽  
System Analysis ◽  
Rolling Element Bearings ◽  
Lumped Mass ◽  
One Dimensional ◽  
System A ◽  
Rolling Element ◽  
Speed Range ◽  
Full Speed ◽  
Stiffness And Damping

Abstract A high speed (25,000 rpm) routing machine with a 300 lb rotor was designed and manufactured. To accommodate the high shaft speed, 2.6 million DN, rolling element bearings were used with ceramic balls and inner races. In order to control the magnitude of the vibration, damping was incorporated into the system using nonrotating hydrostatic dampers. The journal for the dampers was a cylindrical cartridge that had the rolling element bearings clamped inside of it. Extensive analysis was performed on this system. A computer program was written that could model the orbit path of the lumped mass shaft in the damper over the full speed range. A second program was also written that calculated the damper nonlinear stiffness and damping coefficients, and incorporated them in with a one-dimensional beam, finite element rotordynamics model of the system. Analysis results are presented along with experimental run data from the machine. Balancing problems encountered during commissioning have limited the results to 16,500 rpm to date. The last of which is currently being remedied.

An Intelligent Real Time Design Methodology for Catalog Selection

1991 ◽  
Author(s):  
S. R. Bradley ◽  
Alice M. Agogino
Keyword(s):  
Real Time ◽  
Design Methodology ◽  
Analytic Approach ◽  
Limited Resources ◽  
Rolling Element Bearings ◽  
Time Problem ◽  
Rolling Element ◽  
Improved Design ◽  
The Cost ◽  
Selection Of

Abstract An Intelligent Real Time Problem Solving (IRTPS) methodology is presented for catalog selection applications. A decision analytic approach is developed with the goal of assisting designers in making decisions during catalog selection that balance the cost of the limited resources consumed during the design process, such as the designer’s time, against the benefit to be derived from the utilization of those resources in terms of expectations of an improved design. This decision analytic approach is shown to complement other formal methods for design based on interval arithmetic and qualitative optimization, and a general methodology is proposed for performing catalog selection utilizing a combination of these methods. An example application to the selection of rolling element bearings is presented to clarify the methodology.

Optimal Frequency Band Selection for the Square Envelope Spectrum in the Diagnostics of Rolling Element Bearings

2014 ◽  
Author(s):  
S. Chatterton ◽  
P. Borghesani ◽  
P. Pennacchi ◽  
A. Vania
Keyword(s):  
Frequency Band ◽  
Vibration Signal ◽  
Band Selection ◽  
Rolling Element Bearings ◽  
Optimal Frequency ◽  
Simple Method ◽  
Rolling Element ◽  
Envelope Spectrum ◽  
Bearing Damage ◽  
Selection Of

Diagnostics of rolling element bearings is usually performed by means of a second-order cyclostationary tool applied to the vibration signal, due to the stochastic nature of the contact between the defect and the bearing rolling elements. The most used and simple method is the Envelope Analysis that is based on the identification of bearing damage frequency components in the so-called Square Envelope Spectrum. The main critical point of this technique is the selection of a suitable frequency band for the demodulation of the vibration signal. The most used approach for the frequency band selection is based on the evaluation of the band-Kurtosis index by mean of diagrams as the frequently used Fast Kurtogram or the more recent Protrugram. Both of them may fail in the selection of the optimal frequency band when other vibration sources affect the Kurtosis index. Also critical is the constancy in the time of this optimal band. In the paper, an experimental case of a bearing damage is investigated and an alternative approach for the filter band selection, the so-called “PeaksMap”, will be proposed by the authors and compared with the ones available in the literature.

Diagnostics of Rolling Element Bearings by Means of the Higuchy Fractal Dimension

2015 ◽  
Author(s):  
Steven Chatterton ◽  
Paolo Pennacchi ◽  
Andrea Vania ◽  
Phuoc Vinh Dang ◽  
Filippo Cangioli
Keyword(s):  
Fractal Dimension ◽  
Critical Point ◽  
Rolling Element Bearing ◽  
Rolling Element Bearings ◽  
Damage Indicator ◽  
Rolling Element ◽  
Element Bearing ◽  
The Common ◽  
Higuchi Fractal Dimension ◽  
Selection Of

In the field of rolling element bearing, the degradation of bearing health could be detected by means of suitable damage indexes. Band-Kurtosis index, that is the kurtosis value of the band-filtered signal, is often assumed. The critical point of this approach is the selection of a suitable filter band. In the paper, the use of a chaos metrics, namely the Higuchi fractal dimension as damage indicator is described. The trend of this index is compared with the common approach of band-kurtosis indicator for an experimental case of a rolling element bearing in which the defect developed until a permanent failure.

Dynamics of Bearing Shaft Systems

2005 ◽  
Author(s):  
Farshid Sadeghi ◽  
Carl Wassgren ◽  
Nicholas Prenger ◽  
Niranjan Ghaisas ◽  
Eric Chamberlain
Keyword(s):  
Rolling Bearing ◽  
Rolling Element Bearings ◽  
Loading Conditions ◽  
Rotating Shaft ◽  
Type Analysis ◽  
Rolling Element ◽  
Rolling Elements ◽  
Bearing Dynamics ◽  
Bearing System

The objective of this study was to develop a bearing model which can be combined with shafts, gears etc. to virtually investigate the motion and loading of the elements in the bearing. Models for ball, cylindrical and tapered rolling bearing dynamics have been designed, developed and combined with rigid and flexible shafts subject to various loading conditions and eccentric masses. The results from this investigation demonstrated that for rotating shaft bearing systems, the motion and the loads on the rolling elements are significantly different than that predicted by static and / or quasi-static type analysis. Results from shaft bearing system, where shaft may be supported by combinations of ball and rolling element bearings will be demonstrated. Cage motion and stability under various load and speed combinations will be discussed.

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