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Sunday, November 15, 2020 | History

3 edition of Stochastic sensitivity measure for mistuned high-performance turbines found in the catalog.

Stochastic sensitivity measure for mistuned high-performance turbines

Stochastic sensitivity measure for mistuned high-performance turbines

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  • 32 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Turbines -- Blades.,
  • Vibration (Aeronautics)

  • Edition Notes

    StatementDurbha V. Murthy and Christophe Pierre.
    SeriesNASA technical memorandum -- 105821., ICOMP -- 92-13., NASA technical memorandum -- 105821., ICOMP -- 92-13.
    ContributionsPierre, Christophe, 1959-, United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14686323M

    Sriram Sankar, Sudhanva Gurumurthi, and Mircea R. Stan. Sensitivity Based Power Management of Enterprise Storage Systems. MASCOTS Garrett S. Rose, Yuxing Yao, James M. Tour, Adam C. Cabe, Nadine Gergel-Hackett, Nabanita Majumdar, John C. Bean, Lloyd R. Harriott, and Mircea R. Stan. Designing CMOS/molecular memories while considering device. A coordinate measuring machine (CMM) works in much the same way as your finger when it traces map coordinates; its three axes form the machine's coordinate system. Instead of a finger, the CMM uses a probe to measure points on a workpiece. Each point on the workpiece is unique to the machine's coordinate system. "Dynamic Response Predictions for a Mistuned Industrial Turbomachinery Rotor Using Reduced Order Modeling", ASME Journal of Engineering for Gas Turbine and Power, (2), R. Bladh, M.P. Castanier, and C. Pierre.


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Stochastic sensitivity measure for mistuned high-performance turbines Download PDF EPUB FB2

Get this from a library. Stochastic sensitivity measure for mistuned high-performance turbines. [Durbha V Murthy; Christophe Pierre; United States. National Aeronautics and Space Administration.]. Stochastic sensitivity measure for mistuned high-performance turbines.

A stochastic measure of sensitivity is developed in order to predict the effects of small random blade mistuning on the dynamic aeroelastic response of turbomachinery blade assemblies. This sensitivity measure is based solely on the nominal system design (i.e., on tuned Author: Christophe Pierre and Durbha V.

Murthy. stochastic sensitivity measure that allows the global prediction of mistuning effects is developed. Introduction THE current trend in the design of high-performance pro-pulsion turbomachinery has resulted in systems designed for finite service life.

These systems produce high power in compact and light-weight machines, which require stringent. A Sensitivity-Based Method for Direct Stochastic Analysis of Nonlinear Forced Response for Bladed Discs With Friction Interfaces GT Effects of Contact Interface Parameters on Vibration of Turbine Bladed Disks With Underplatform DampersCited by:   Stochastic uncertainty quantification for safety verification applications in nuclear power plants.

A correlation coefficient was computed as a sensitivity measure. the use of high performance computing techniques is expected to minimize the effect of such draw by: 1.

A thorough study of the influence of the material anisotropy mistuning and its sensitivity on the characteristics of the forced response is carried out using finite element (FE) modes of anisotropy mistuned realistic bladed disk with nonlinear friction joints of blade roots and shroud contacts.

Therefore, in the sensitivity computation, for a large number of frequency points, this reduced matrix of size of the number of selected modes is inverted at a low cost.

Computation of undetermined coefficients. To compute the undetermined coefficients in the stochastic reduced basis representation, stochastic variants of the BG scheme are used. Chan, Y.-J., and Ewins, D. J.,“ The Amplification of Vibration Response Levels of Mistuned Bladed Disks: Its Consequences and Its Distribution in Specific Situations,” ASME Journal of Engineering for Gas Turbines and Power, Vol.

October, to This is the first comprehensive volume on nearly periodic structures and mistuned blade vibration. Alok Sinha presents fundamental concepts and state-of-the-art techniques in the analysis of free and forced response of a nearly periodic structure, weaving together his own work (covering thirty-five years of research in this field) with works by other researchers.

28 April | Journal of Engineering for Gas Turbines and Power, Vol.No. Stochastic sensitivity measure for mistuned high-performance turbines book A reduced order model based on sector mistuning for the dynamic analysis of mistuned bladed disks International Journal of Mechanical Sciences, Vol.

53, No. 10 April | Journal of Engineering for Gas Turbines and Power, Vol.No. 7 Forced Response Analysis of a Mistuned Blisk Using Noncyclic Reduced-Order.

The focus of the paper is the analysis of mistuning, which are small deviations of the blade properties, e.g., due to manufacturing tolerances. The resonant amplitudes of turbine blades are very sensitive to these deviations which can lead to significantly increased vibratory response of some blades with the increased risk of high cycle fatigue.

A.P. Vassilopoulos, in Advances in Wind Turbine Blade Design and Materials, Abstract: Fatigue life prediction of wind turbine rotor blades is a very challenging task, as blade failure is led by different failure types that act synergistically.

Inherent defects like wrinkles, fiber misalignments and voids, that can be introduced during fabrication, can constitute potential damage. The paper presents a novel hybrid method to enhance the computational efficiency of matrix inversions during the stochastic analysis of mistuned bladed disc systems.

The method is based on the use of stochastic Neumann expansion in the frequency domain, coupled with a matrix factorization in the neighbourhood of the resonant frequencies.

We evaluate the sensitivity of simulated turbine-height wind speeds to 26 parameters within the Mellor–Yamada–Nakanishi–Niino (MYNN) planetary boundary-layer scheme and MM5 surface-layer scheme of the Weather Research and Forecasting model over an area of complex terrain.

An efficient sampling algorithm and generalized linear model are used to explore the multiple-dimensional. Dynamic pressure as a measure of gas turbine engine (GTE) performance View the table of contents for this issue, or go to the journal homepage for more Meas.

Sci. Technol. 21   Sensitivity and Forced Response Analysis of Anisotropy-Mistuned Bladed Disks With Nonlinear Contact Interfaces 26 September | Journal of Engineering for Gas Turbines and Power, Vol.

No. 10 Parallel Finite Element Framework for Rotorcraft Multibody Dynamics and Discrete Adjoint Sensitivities. A powerful but easily calculated stochastic sensitivity measure that allows the global prediction of mistuning effects is developed. ODUCTION The current trend in the design of high performance propulsion turbomachinery has resulted in systems designed for finite service life.

These systems produce high power, in. The procedure comprises an optimization analysis based on the conjugate gradient method and a stochastic simulation using the importance sampling method.

Two examples are provided to illustrate the efficiency of the procedure, which can be 2 or 3 orders of magnitude more efficient than Monte Carlo simulations. The e-book database EBC; Audiovisual media; Research data; Alliance and national licences; Stochastic Sensitivity Measure for Mistuned High-Performance Turbines.

Murthy, D. / Pierre, C. | print version. Performance of a Propeller Type Small Wind Turbine with a Side Vane (Response to the Changes in Wind Speed and Direction. Based on the inferred credible intervals, a measure is defined to quantify the potential risk of response maxima.

Gaussian process emulation is proposed for Monte Carlo uncertainty analysis to reduce data acquisition costs. = measure for sensitivity or strength for localization (−) S = sensitivity.

u = relative displacement (m) w = amplitude (m) w 0 = parameter of the Weibull-distribution (m) x, y, z = coordinates (m) A = system matrix. B = matrix. F = generalized force vector. K = stiffness matrix. q = vector of modal coordinates.

T = modal matrix of the bladed. The book introduces the power of stochastic programming to a wider audience and demonstrates the application areas where this approach is superior to other modeling approaches.

Applications of Stochastic Programming consists of two parts. The first part presents papers describing publicly available stochastic programming systems that are. This chapter discusses the stability, reproducibility, and sensitivity of combined systems of automatic control with variable structure.

In the synthesis of high-performance control systems one should distinguish between two essentially different approaches depending on the measurability or unmeasureability of external influences. Bruno Sudret is a professor of Risk, Safety and Uncertainty quantification at ETH Zurich (Switzerland) since His teaching and research interests are computational methods for uncertainty.

The focus of the fourth part is on the review of efficient simulation methods for the stochastic analysis of mistuned bladed disc systems. high PERformance computing for Turbine. Research and Applications in Structural Engineering, Mechanics and Computation contains the Proceedings of the Fifth International Conference on Structural Engineering, Mechanics and Computation (SEMCCape Town, South Africa, September ).

Over papers are featured. Many topics are covered, but the contributions may be seen to fall. of wind-turbine gearbox oil, which is termed offline-CM. In contrast, online-CM is implemented using permanently installed monitoring equipment.

In case of wind turbines, the monitoring of structural components as the support structure or rotor blades is often referred to as Structural Health Monitoring (SHM), while systems for. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.

In-service tests–measure the dynamic stresses and natural frequencies of all types of turbine blades under service conditions. The three tests. Mode hopping is characterized by a stochastic exchange of power between two longitudinal modes of a laser, inducing a high-level intensity noise in the laser's output.

ASME Measurement of Exhaust Emissions from Stationary Gas Turbine Engines B, Published ASME PTC 36 Measurement of Industrial Sound (ASME B), Published Mechanical Parameters ASME B Basic Gas Turbines, Published (Reaffirmed: ) ASME B Procurement Standard for Gas Turbine Auxiliary.

Unfortunately, particularly for Kaplan turbines, there are only a few techniques to measure absolute flow. All of these are expensive and time-consuming to use.

Several techniques have been developed and used in the past to employ turbine model data to convert relative flow and relative efficiency data into absolute data. Stochastic Modeling.

We consider a single-celled organism as a single, well-mixed compartment. Consider a reaction network in a chamber that satisfies the standard assumptions of stochastic chemical kinetics and contains a set of species that interact along a set of reaction state of the reaction network at time as a -dimensional vector, where denotes the population of the.

The current PYTSA version introduces the notion of dataset as a set of files in some folder, and assumes that each file represents a independent time-evolution of a boost loading of huge datasets, a multi-process implementation is adopted. In each data file, columns represent the values of a model variable to which a mnemonic name can be assigned, for clarity (see the Example below).

Introduction. Salmonella enterica serovar Typhi (Typhi), the causal agent of typhoid, is a bacterial pathogen transmitted between humans, by ingestion of contaminated faces and urine.

In many low-income settings S. Typhi is endemic, but elsewhere sporadic epidemics occur. It was a major cause of death in the industrialized world until the early 20 th century, when disease rates fell.

In this paper the idea is extended to problems arising in the simulation of stochastic systems. Discrete-time Markov chains, continuous-time Markov chains, and generalized semi-Markov processes are covered.

Journal of Modern Power Systems and Clean Energy, Vol. 7, No. High-performance computing in finance: The last 10 years and the. Like for other stochastic models, discovering parameter values of ABMs in a way that makes the model conform to actual experimental data is an ongoing research challenge.

In recent years, there have been attempts to automate the discovery of model parameters using modern high-performance. Moyroud, F, Fransson, T, & Jacquet-Richardet, G. "A Comparison of Two Finite Element Reduction Techniques for Mistuned Bladed-Disks." Proceedings of the ASME Turbo Expo Power.

() Applying High Performance Computing to Transmission-Constrained Stochastic Unit Commitment for Renewable Energy Integration. IEEE Transactions on Power Systems() (s,S) policy model for liner shipping refueling and sailing speed optimization problem. Just as with sensitivity analysis, stochastic budgeting with discrete probabilities is readily conducted via spreadsheet analysis on a personal computer.

More generally, specialist software add-ins such as @Risk (Palisade Corporation ; Winston ) for use with spreadsheet software such as Excel or Lotus can be used.The typical 5 m s −1 propagation speed of the MJO is captured and the peaks in the spectral power plots of zonal wind and heating fields are consistent with observations.

A manifestation of intermittent stochastic behavior of MJO variability can be seen in the various types of. This metric is similar to that used to measure single cell response to steps in chemoattractant (6, 10, 31). We found that cells with multiple flagella generated a tumble more quickly in response to step increases in Y p as compared to cells with a single flagellum (Fig.

2 E) by as much as s for Y p increases of μM.