Forced response analysis of a transonic turbine using a free interface component mode synthesis method

• Assessing forced response is crucial during the design phase of turbomachines. Since the analyses are computationally expensive and time-consuming when using full models, Reduced Order Models (ROM) are utilized to decrease the number of Degrees Of Freedom (DOF) and consequently analysis time and cost. The ROM used in the current analysis belongs to the component mode synthesis (CMS) method with a free-interface approach known as Craig-Chang. A transonic high pressure turbine is investigated featuring large ranges of disk and blade dominated modes depending in the Nodal Diameter (ND). The free-interface approach will be assessed in the disk and blade dominated regions with a detailed study of the frequencies and mode shapes. In addition, a forced response analysis within the blade dominated region is evaluated in the paper. Moreover, a study of the amount of modes required in the basis for the reduced order transformation matrix is presented.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering (hsv//eng)

Nyckelord

Degrees of freedom (mechanics)

Fluid dynamics

Linear transformations

Modal analysis

Structural analysis

Thermodynamics

Transonic aerodynamics

Turbines

Turbomachine blades

Turbomachinery

Component mode synthesis

Current analysis

Forced response analysis

Free-interface component mode synthesis

Number of degrees of freedom

Reduced order models

Transonic high pressure turbine

Transonic turbine

Turbine components

Publikations- och innehållstyp

ref (ämneskategori)

kon (ämneskategori)