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Start Over Subject bladed disk

1. Calculation of natural vibration of linear undamped rotationally periodic structures

Creator:
Polach, Pavel
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
rotational periodicity, subsystem, natural vibration, bladed disk, and steam turbine
Language:
English
Description:
The article presents the method of the calculation of natural frequencies and mode shapes of the linear undamped rotationally periodic systems. The method is applied in the calculation of the natural vibration characteristics of the steam turbine bladed disks., Obsahuje seznam literatury, and Součástí článku je Appendix A - Solution of matrix difference equations (str. 93-97)
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Evaluation of the suitability of the bladed disk design regarding the danger of the resonant vibration excitation

Creator:
Polach, Pavel
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
bladed disk, resonant vibration, SAFE diagram, and continuous binding
Language:
English
Description:
A suitability of the bladed disk design regarding the possibility of the resonant vibration excitation can be assessed on the basis of several approaches. Most information concernng the evaluation of the bladed disk design suitability is provided in theSAFE diagram but the possibility of exciting the action wheel resonant vibration can also be evaluated from the Campbell diagram. Further criterion is the assessment of the design suitability on the basis of a critical speed of the bladed disk. It expecially causes breakdowns of relatively flexible disks. The suitability of the bladed disk with the blades of the ZN340-2 type was evaluated. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Modal condensation of bladed disk

Creator:
Šašek, Jakub, Zeman, Vladimír, and Kellner, Josef
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
modal condensation, bladed disk, modal analysis, and FEM
Language:
English
Description:
The aim of the paper is modal condensation of a system which represents bladed disk. These kinds of systems are mainly used in steam turbines what is the topic of the article. The model of the bladed disk is based on decomposition into a disk subsystem and a blading subsystem. The finite element method is used for modeling of the both subsystems. All influences of steady-state rotation are respected as centrifugal forces, gyroscopic effects, centrifugal stiffening of blades and dynamic softening. Blades are modeled by using ID elements and the disk is modeled by using 3D hexahedral elements. Modal condensation is applied to a disk subsystem. Different levels of the condensation are presented and compared on a testing bladed disk. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Sensitivity analysis of a blade couple under rotation

Creator:
Byrtus, Miroslav, Hajžman, Michal, and Zeman, Vladimír
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
sensitivity analysis, friction damper, blades, bladed disk, and harmonic balance method
Language:
English
Description:
The aim of the paper is to show the influence of design parameters on the suppression of rotating blade vibration. The derivation of nonlinear mathematical model of a blade couple mutually connected by a friction element is summarized. After that, the linearization of the mathematical model is performed by harmonic balance method. The linearized model is used for sensitivity analysis of real and imaginary parts of eigenvalues in the course of rotation and sensitivity analysis of stead-state response with respect to the design parameters of internal friction coupling. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public