Dynamic Characterization of an Additive Manufactured Turbine Wheel of Turbocharger

2019 ◽  
Author(s):  
Panneer Selvam R. ◽  
Muthukannan Duraiselvam ◽  
Sanjay G. Barad ◽  
Dilip Kumar
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Conventional Technique ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Dynamic Characterization ◽  
Turbine Wheel ◽  
Correlation Studies ◽  
Simulated Environment

Abstract Experimental Modal Analysis (EMA) is a conventional technique for establishing the modal parameters of the components. The modal parameters are the dynamic characteristics viz. frequency, mode shapes and damping that are used for assessing and validating the design predictions through correlation studies. For this task EMA technique is adopted to assess the dynamic characteristics of an additive manufactured (AM) turbine wheel of a turbocharger. Correlation studies are undertaken to validate the theoretical model developed. These Correlation studies ensured that there is no major deviations to proceed for high speed spin testing of this turbine wheel in simulated environment. The possible interference or resonances in the operating range are identified for safe operation of the test rotor.

Operational Modal Analysis for Dynamic Characterization of a Ro-Lo Ship

2014 ◽  
Vol 58 (04) ◽  
pp. 216-224 ◽  
Author(s):  
Esben Orlowitz ◽  
Anders Brandt
Keyword(s):  
Modal Analysis ◽  
Natural Frequencies ◽  
Operating Conditions ◽  
Operational Modal Analysis ◽  
Mode Shapes ◽  
Dynamic Characterization ◽  
Sea Trial ◽  
Global Modes ◽  
Bending Modes

The dynamic characteristics of ship structures are becoming more important as the flexibility of modern ships increases, for example, to predict reliable design life. This requires an accurate dynamic model of the structure, which, because of complex vibration environment and complex boundary conditions, can only be validated by measurements. In the present paper the use of operational modal analysis (OMA) for dynamic characterization of a ship structure based on experimental data, from a full-scale measurement of a 210-m long Ro-Lo ship during sea trial, is presented. The measurements contain three different data sets obtained under different operating conditions of the ship: 10 knots cruising speed, 18 knots cruising speed, and at anchor. Natural frequencies, modal damping ratios, and mode shapes have been successfully estimated for the first 10 global modes. Damping ratios for the current ship were found within the range 0.9%–1.9% and natural frequencies were found to range from 0.8 to 4.1 Hz for the first 10 global modes of the ship at design speed (18 knots). The three different operating conditions showed, in addition, a speed dependency of the natural frequencies and damping ratios. The natural frequencies were found to be lower for the 18-knots condition compared with the two other conditions, most significantly for the vertical bending modes. Also, for the vertical bending modes, the damping ratios increased by 28%–288% when the speed increased from 10 to 18 knots. Other modes were not found to have the same strong speed dependency.

Dynamic Characterization of a Fiber-Metal Laminate

2013 ◽  
Vol 535-536 ◽  
pp. 48-51 ◽  
Author(s):  
Rafael Celeghini Santiago ◽  
Marcilio Alves
Keyword(s):  
High Speed ◽  
High Strain ◽  
Strain Rates ◽  
Dynamic Characterization ◽  
Fiber Glass ◽  
Strain And Strain Rate ◽  
Fiber Metal Laminate ◽  
Split Hopkinson ◽  
Fiber Metal

The mechanical strength of a fiber-metal laminate is not so well explored at high strain rates, although its constituents are prone to exhibit such effects. In this paper, we describe an investigation of aluminium-fiber glass material using the Split Hopkinson bar device. We report on various experimental issues related to these tests, giving some emphasis to the use of high speed filming to obtain information on the specimen strain and strain rate.

Finite Element Modal Analysis for Face-Milling Cutter

2013 ◽  
Vol 589-590 ◽  
pp. 19-22
Author(s):  
Lu Ning Liu ◽  
Zhen Yu Shi ◽  
Zhan Qiang Liu
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Face Milling ◽  
Operating Conditions ◽  
Mode Shapes ◽  
Milling Cutter ◽  
Characteristics Analysis ◽  
The Face

In this paper, a face-milling tool system is dealt with the Finite Element Modal Analysis (FEMA) using advanced contact technology functionalities. Dynamic characteristics analysis is performed and the stiffness contribution is included in the modal pre-stressed analysis. Natural frequencies and mode shapes of vibration are calculated. The FEMA is followed by experiments performed for different operating conditions of the face-milling system. The dynamic characteristics obtained in this paper can be used to optimize the face-milling cutter in high speed machining.

scholarly journals Modal identification of Bridge 44 of the Carajás Railroad and numerical modeling using the finite element method

2020 ◽  
Vol 13 (1) ◽  
pp. 39-68
Author(s):  
M. S. SILVA ◽  
F. A. NEVES
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Dynamic Characteristics ◽  
Modal Identification ◽  
Mode Shapes ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Vibration Tests ◽  
Element Method

Abstract Regular use and the effects of time can affect the behavior of a structure. Over time, problems such as the occurrence of small fissures, oxidation of steel elements, and excessive displacements at some points may arise in a structure. In this context, the monitoring of structures through experimental tests has gained more importance, because it allows for the identification of the dynamic characteristics (natural frequencies, mode shapes, and damping rate) of structures. The dynamic characteristics can be obtained through forced vibration tests, which are based on measuring the response of a structure subjected to an excitation of known magnitude, or through tests in which only the structural response is measured, such as free vibration and ambient vibration tests. The present study aims to identify the modal parameters of bridge 44 of the Carajás Railroad, using experimental data obtained on site by monitoring the vibration caused by a group of people jumping, and it compares them with the results obtained through numerical modeling performed using the finite element method, developed in CSiBridge. The modal parameters were obtained using the commercial software ARTeMIS Modal, and stochastic subspace identification was used for modal identification.

Comparison of Blade Tip Timing With Strain Gauge Data for Evaluation of Dynamic Characterization of Last Stage Blade With Interlocked Shroud for Steam Turbine

2018 ◽  
Author(s):  
Jiamin Zhang ◽  
Peng Shan ◽  
Kai Cheng ◽  
Dechao Ye
Keyword(s):  
Steam Turbine ◽  
Strain Gauge ◽  
High Speed ◽  
Aircraft Engine ◽  
Dynamic Strain ◽  
Dynamic Characterization ◽  
Speed Test ◽  
Gauge Data ◽  
Last Stage

The tip-timing technology has been widely developed and has become an industry standard in aircraft engine and gas turbine over past decade. The main application of the tip-timing method is to verify safe operation of blades and monitor the health of blades. But tip-timing technology gets rarely used to the last stage blade of steam turbine. Particularly the blade is designed with an integral shroud, snubber and fir-tree root. The article mainly describes the process of identifying the dynamic characterization of last stage blade with an integral shroud and snubber by contactless measurements provided by tip-timing technology. Attention is focused on the comparison of tip-timing results with the results from strain gauge data. Firstly, the frequency response of the bladed blisk is calculated by using Computer-Aided-Engineering (CAE) technologies. Secondly, according to the results of finite element modal calculation, the location of strain gauge is confirmed. The dynamic strain of blade is measured by utilizing telemetry technology. Finally, according to the design features of integral shroud, the tip-timing probe locations must be accurately confirmed in order to acquire the valid data. All probes are positioned along the radial direction of blades. The rotating vibration test of the bladed blisk has been carried out in the high-speed test rig. In order to validate the tip-timing measurement, all the results from the tip-timing, especially the resonant frequencies and damping ratios, are compared with results from the strain gauges with which only a few blades were equipped.

Comparison of Modeling Techniques for the Vibration Analysis of Printed Circuit Cards

1992 ◽  
Vol 114 (4) ◽  
pp. 378-383 ◽  
Author(s):  
J. M. Pitarresi ◽  
A. A. Primavera
Keyword(s):  
Primary Objective ◽  
Ease Of Use ◽  
Performance Assessments ◽  
Mode Shapes ◽  
Electronic Packages ◽  
Dynamic Characterization ◽  
Printed Circuit ◽  
Modeling Techniques ◽  
Overall Reliability

The estimation of the mechanical reliability of components on a vibrating circuit card continues to be an important part of the overall reliability assessment for electronic packages. To achieve a good vibration reliability estimate it is necessary to have an accurate representation of the dynamic response of the card. This can be realized by having the modal characteristics of the circuit card, i.e., its natural frequencies and mode shapes, accurately modeled. It is the primary objective of this paper to review some of the current modeling techniques for the dynamic characterization of circuit cards populated with components. Performance assessments include tangible factors such as accuracy of predicted frequencies and mode shapes, as well as less tangible factors such as ease of use. The circuit cards considered in this study are intended to be representative of small to medium sized logic, memory, and processor cards used in commercial electronics; the card is composed of laminated copper and FR-4 glass epoxy, typically without a bonded heat sink or intermediate stiffeners, and it may be populated with both SMT and PIH components.

scholarly journals Dynamic Characterization of III-Nitride-Based High-Speed Photodiodes

2017 ◽  
Vol 9 (4) ◽  
pp. 1-7 ◽  
Author(s):  
Bandar Alshehri ◽  
Karim Dogheche ◽  
Sofiane Belahsene ◽  
Abderrahim Ramdane ◽  
Gilles Patriarche ◽  
...  
Keyword(s):  
High Speed ◽  
Dynamic Characterization
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