Dynamic Analysis of a Turbocharger Centrifugal Compressor Impeller

1991 ◽  
Author(s):  
V. Ramamurti ◽  
D. A. Subramani ◽  
K. Sridhara
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Centrifugal Compressor ◽  
Element Model ◽  
Simplified Model ◽  
Cyclic Symmetry ◽  
Compressor Impeller ◽  
Cyclic Symmetric ◽  
The Finite Element Model

Abstract Stress analysis and determination of eigen pairs of a typical turbocharger compressor impeller have been carried out using the concept of cyclic symmetry. A simplified model treating the blade and the hub as isolated elements has also been attempted. The limitations of the simplified model have been brought out. The results of the finite element model using the cyclic symmetric approach have been discussed.

Finite-element model updating of the traditional beam–column joint in Tibetan heritage buildings using uniform design

2020 ◽  
Vol 23 (9) ◽  
pp. 1890-1901
Author(s):  
Lu Dai
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Uniform Design ◽  
Element Model ◽  
Simplified Model ◽  
Finite Element Model Updating ◽  
Solid Model ◽  
Heritage Buildings ◽  
The Finite Element Model

The Que-Ti joint is the traditional beam–column connection in Tibetan heritage buildings and plays an important role in bearing and transferring load. The structure of the Que-Ti joint is very complicated, which makes it very difficult to build a refined solid model during the numerical simulation process. This means that a simplified model of the Que-Ti joint is required. In this article, we propose a finite-element model updating technique based on uniform design and apply this to the finite-element model updating of the Que-Ti joint. A simplified model of the joint was simulated using two uncertain parameters, and by constructing the uniform design matrix, the specific size of each component within the simplified model was then determined. The stress state of the simplified model was compared to the refined solid model, with results indicating that the stress and strain response of the simplified model had a small rate of error when compared with the refined solid model, which confirmed that the finite-element model updating based on the uniform design was effective and that the simplified model of the Que-Ti joint could be applied to the analysis of the structure as whole. A field measurement was also conducted to further verify the numerical simulation. This investigation provides essential information for the structural analysis of Tibetan heritage buildings.

Determination of the Convective Coefficient of Coolant by Comparing the Finite Element Model With the Experimental Results From Surface Grinding

2006 ◽  
Author(s):  
Anand Parthasarathy ◽  
Ian R. Grosse
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Experimental Results ◽  
Surface Grinding ◽  
Work Piece ◽  
Convection Coefficient ◽  
Convective Coefficient ◽  
The Finite Element Model

It is known that coolants play an important role in the grinding operation by reducing the heat that is generated on the work piece. As large amount of specific energy is spent in removing very small amount of the work piece in the finishing operations like grinding, the convective property of coolant plays a significant role in providing the required cooling effect. In today’s world, people have been customizing the coolant used for industry purposes as well as in the area of research. Thus the coolant property becomes an unknown quantity and the convection coefficient of the coolant, which dictates the quantity of heat removed from the workpiece during grinding, determines the coolant’s effectiveness. In this paper the convection coefficient of the coolant was determined for a particular velocity by computing and tuning of finite element model against experimental results. The convective property depends on various parameters such as thermal conductivity, heat capacity among others but in this paper, its dependence on velocity of the coolant is stressed. It was determined from the experimental results of surface grinding operation on workpiece and then comparing them with the finite element model simulated in ANSYS. By varying the convection coefficient parameter, the finite element model was fitted to the experimental results thus resulting in the determination of convective coefficient property of the coolant.

Arched Vaults Made of Corrugated Sheets: Natural Vibration Frequencies

2019 ◽  
pp. 18-24
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Building Structures ◽  
Friction Forces ◽  
Modeling Process ◽  
The Difference ◽  
Russian Norms ◽  
The Finite Element Model

According to the recent Russian norms, when designing building structures, it is necessary to conduct a dynamic analysis of wind loads, which previously was required not in all cases. In arched vaults of profiled arched self-supporting flooring, it was not always necessary to determine the frequencies and forms of natural vibrations. These parameters can be established using the finite element method. Taking into consideration the complex and lengthy modeling process of arched vaults, in particular the contact areas in regular transverse joints, a large number of finite elements in the models and, as a consequence, considerable time for their calculation, it was necessary to identify a sufficient level of detailing of a finite element model for correct calculations of frequencies and forms of vibrations considered in the operation of structures. The influence of the detailing of the finite element model of arched vaults made of profiled flooring on the determination of their natural frequency is revealed. To substantiate the parameters of the finite element model, it was studied how the results of the calculation was influenced by edge effects, the presence of friction in the joints of corrugations of the profiled flooring, the influence of rubber gaskets in the joints on the work of the arched vault. Much attention is paid to the features of the design scheme associated with the choice of the number of sheets of profiled flooring, taking into account the contact nodes, friction forces, etc. It is established that the first vibration frequency is little dependent on the number of sheets of corrugated flooring and the presence of rubber gaskets in the joints. For subsequent frequencies, the difference can be significant.

scholarly journals Force-State Characterization of Struts Using Pinned Joints

1997 ◽  
Vol 4 (2) ◽  
pp. 103-113 ◽  
Author(s):  
Brook D. Ferney ◽  
Steven L. Folkman
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Research Effort ◽  
Element Model ◽  
Mapping Technique ◽  
Model Parameters ◽  
The Finite Element Model ◽  
Pinned Joints

As part of a research effort to study the microgravity dynamics of a truss with pinned joints, a single strut with a single clevis-tang pinned joint was characterized. Experimental data was collected using a force-state mapping technique. The strut was subjected to axial dynamic loads and the response of the strut was measured. The force-state map aids visualization of the strut dynamics. Finite element modeling of the response was explored. An example is presented that uses a method of manual determination of the finite element model parameters. The finite element model results correspond well with the measured strut response.

scholarly journals Sensitivity Analysis of the Influence of Structural Parameters on Dynamic Behaviour of Highly Redundant Cable-Stayed Bridges

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
B. Asgari ◽  
S. A. Osman ◽  
A. Adnan
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Structural Parameters ◽  
Element Model ◽  
Structural Behavior ◽  
Model Tuning ◽  
The Finite Element Model ◽  
Cable Stayed Bridges

The model tuning through sensitivity analysis is a prominent procedure to assess the structural behavior and dynamic characteristics of cable-stayed bridges. Most of the previous sensitivity-based model tuning methods are automatic iterative processes; however, the results of recent studies show that the most reasonable results are achievable by applying the manual methods to update the analytical model of cable-stayed bridges. This paper presents a model updating algorithm for highly redundant cable-stayed bridges that can be used as an iterative manual procedure. The updating parameters are selected through the sensitivity analysis which helps to better understand the structural behavior of the bridge. The finite element model of Tatara Bridge is considered for the numerical studies. The results of the simulations indicate the efficiency and applicability of the presented manual tuning method for updating the finite element model of cable-stayed bridges. The new aspects regarding effective material and structural parameters and model tuning procedure presented in this paper will be useful for analyzing and model updating of cable-stayed bridges.

Biodynamics of Human Thorax With Body Armors Subject to Bullet Impact

2001 ◽  
Author(s):  
Y. W. Kwon ◽  
J. A. Lobuono
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Body Armor ◽  
Projectile Impact ◽  
Human Thorax ◽  
Trachea And Bronchi ◽  
Armor System ◽  
The Finite Element Model

Abstract The objective of this study is to develop a finite element model of the human thorax with a protective body armor system so that the model can adequately determine the thorax’s biodynamical response from a projectile impact. The finite element model of the human thorax consists of the thoracic skeleton, heart, lungs, major arteries, major veins, trachea, and bronchi. The finite element model of the human thorax is validated by comparing the model’s results to experimental data obtained from cadavers wearing a protective body armor system undergoing a projectile impact.

Use of DNVGL-RP-C203 for Determining the Fatigue Capacity of Connectors

2021 ◽  
Author(s):  
Anthony Muff ◽  
Anders Wormsen ◽  
Torfinn Hørte ◽  
Arne Fjeldstad ◽  
Per Osen ◽  
...  
Keyword(s):  
Finite Element ◽  
Fatigue Testing ◽  
Experimental Testing ◽  
High Strength ◽  
Element Model ◽  
Fatigue Analysis ◽  
Full Scale ◽  
The Finite Element Model

Abstract Guidance for determining a S-N based fatigue capacity (safe life design) for preloaded connectors is included in Section 5.4 of the 2019 edition of DNVGL-RP-C203 (C203-2019). This section includes guidance on the finite element model representation, finite element based fatigue analysis and determination of the connector design fatigue capacity by use of one of the following methods: Method 1 by FEA based fatigue analysis, Method 2 by FEA based fatigue analysis and experimental testing and Method 3 by full-scale connector fatigue testing. The FEA based fatigue analysis makes use of Appendix D.2 in C203-2019 (“S-N curves for high strength steel applications for subsea”). Practical use of Section 5.4 is illustrated with a case study of a fatigue tested wellhead profile connector segment test. Further developments of Section 5.4 of C203-2019 are proposed. This included acceptance criteria for use of a segment test to validate the FEA based fatigue analysis of a full-scale preloaded connector.

Analysis of Effective Pre-Stress of Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 671-674 ◽  
pp. 1012-1015
Author(s):  
Zhao Ning Zhang ◽  
Ke Xing Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.

scholarly journals Physical Principles of a Piezo Accelerometer Sensitive to a Nearly Constant Signal

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3258 ◽  
Author(s):  
Valery Gupalov ◽  
Alexander Kukaev ◽  
Sergey Shevchenko ◽  
Egor Shalymov ◽  
Vladimir Venediktov
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Frequency Band ◽  
Linear Acceleration ◽  
High Sensitivity ◽  
Element Model ◽  
Wide Frequency Band ◽  
Piezoelectric Accelerometer ◽  
The Finite Element Model ◽  
Physical Principles

The paper considers the construction of a piezoelectric accelerometer capable of measuring constant linear acceleration. A number of designs are proposed that make it possible to achieve high sensitivity with small dimensions and a wide frequency band (from 10−5 Hz). The finite element model of the proposed design was investigated, and its output characteristic and scale factor (36 mV/g) were obtained.

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