An Efficient Solution for Wire Sweep Analysis in IC Packaging

2003 ◽  
Vol 125 (1) ◽  
pp. 139-143 ◽  
Author(s):  
Jerry Su ◽  
Sheng-Jye Hwang ◽  
Francis Su ◽  
Shou-Kang Chen
Keyword(s):  
Structure Analysis ◽  
Efficient Solution ◽  
Flow Analysis ◽  
Experimental Measurements ◽  
Global Flow ◽  
Important Requirement ◽  
Ic Packaging

Various methodologies of wire sweep analysis have been introduced to get better prediction and matching the experimental measurements by many researchers. As more and more high pin-count packages (such as BGA, QFP) are used today, efficiency has become an important requirement besides accuracy for software used to predict wire sweep in IC packaging. This study introduces a newly developed wire sweep analysis solution (InPack), not only to meet the need of accuracy, but also enhance the efficiency for actual applications. It combines global flow analysis (C-MOLD) and structure analysis (ANSYS) to become a solution for general wire sweep analysis.

Measurement and Calculation of Ventilation in the Floor of the Brewery Žirovnice

2014 ◽  
Vol 1041 ◽  
pp. 321-324
Author(s):  
Jiří Jurka ◽  
Jan Škramlík
Keyword(s):  
Air Flow ◽  
Flow Analysis ◽  
Experimental Measurements ◽  
Historic Buildings ◽  
The City ◽  
Cultural Monuments

The article discusses how to test the functionality of air insulations designed for the floor ventilation in historic buildings and follows on from the previously published articles. A flow analysis is being performed on an object of the City of Zirovnice which has been registered in the list of cultural monuments and was built as a brewery in the years 1589-1592 on the site of an older medieval building. The foundations and external brickwork consist mostly of stone. This article brings new air flow readings. The aim of the article is to analyse in detail the air flow in a specific floor void with the aid of modern CFD programs and experimental measurements using the ALMEMO device.

Digital Twin Aided IC Packaging Structure Analysis for High-quality Sample Preparation

2021 ◽  
Author(s):  
Chengjie Xi ◽  
Aslam A. Khan ◽  
John True ◽  
Nidish Vashistha ◽  
Nathan Jessurun ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Structure Analysis ◽  
High Quality ◽  
Digital Twin ◽  
Ic Packaging ◽  
Packaging Structure ◽  
High Quality Sample

On the Application of a Linearized Unsteady Potential-Flow Analysis to Fan-Tip Cascades

1986 ◽  
Vol 108 (1) ◽  
pp. 59-67
Author(s):  
W. J. Usab ◽  
J. M. Verdon
Keyword(s):  
Potential Flow ◽  
Vibrational Frequency ◽  
Numerical Solutions ◽  
Flow Analysis ◽  
Experimental Measurements ◽  
Two Dimensional ◽  
Good Qualitative Agreement ◽  
Blade Loading ◽  
Unsteady Aerodynamic ◽  
Flow Phenomena

A linearized potential flow analysis, which accounts for the effects of nonuniform steady flow phenomena on the unsteady response to prescribed blade motions, has been applied to five two-dimensional cascade configurations. These include a flat-plate cascade and three cascades which are representative of the tip sections of current fan designs. Here the blades are closely spaced, highly staggered, and operate at low mean incidence. The fifth configuration is a NASA Lewis cascade of symmetric biconvex airfoils for which experimental measurements are available. Numerical solutions are presented that clearly illustrate the effects and importance of blade geometry and mean blade loading on the linearized unsteady response at high subsonic inlet Mach number and high blade-vibrational frequency. In addition, a good qualitative agreement is shown between the analytical predictions and experimental measurements for the cascade of symmetric biconvex airfoils. Finally, recommendations on the research needed to extend the range of application of linearized unsteady aerodynamic analyses are provided.

Nonlinear System Identification of Frictional Connections in a Bolted Beam Assembly

2012 ◽  
Author(s):  
Melih Eriten ◽  
Mehmet Kurt ◽  
Guanyang Luo ◽  
Donald M. McFarland ◽  
Lawrence A. Bergman ◽  
...  
Keyword(s):  
System Identification ◽  
Nonlinear System ◽  
Energy Levels ◽  
Nonlinear System Identification ◽  
Flow Analysis ◽  
Nonlinear Damping ◽  
Experimental Measurements ◽  
Slow Flow ◽  
Reduced Order Models ◽  
Reduced Order

In modern structures, mechanical joints are ubiquitous, significantly influencing a structure’s dynamics. Frictional connections contained in a joint provide coupling of forces and moments between assembled components as well as localized nonlinear energy dissipation. Certain aspects of the mechanics of these friction connections are yet to be fully understood and characterized in a dynamical systems framework. This work applies a nonlinear system identification (NSI) technique to characterize the influence of frictional connections on the dynamics of a bolted beam assembly. The methodology utilized in this work combines experimental measurements with slow-flow dynamic analysis and empirical mode decomposition, and reconstructs the dynamics through reduced-order models. These are in the form of single-degree-of-freedom linear oscillators (termed intrinsic modal oscillators — IMOs) with forcing terms derived directly from the experimental measurements through slow-flow analysis. The derived reduced order models are capable of reproducing the measured dynamics, whereas the forcing terms provide important information about nonlinear damping effects. The NSI methodology is applied to model nonlinear friction effects in a bolted beam assembly. A ‘monolithic’ beam with identical geometric and material properties is also tested for comparison. Three different forcing (energy) levels are considered in the tests in order to study the energy-dependencies of the damping nonlinearities induced in the beam from the bolted joint. In all cases, the NSI technique employed is successful in identifying the damping nonlinearities, their spatial distributions and their effects on the vibration modes of the structural component.

A Centrifugal Compressor Flow Analysis Employing a Jet-Wake Passage Flow Model

1977 ◽  
Vol 99 (1) ◽  
pp. 141-147 ◽  
Author(s):  
J. H. G. Howard ◽  
C. Osborne
Keyword(s):  
Centrifugal Compressor ◽  
Curve Fitting ◽  
Flow Model ◽  
Flow Analysis ◽  
Stagnation Pressure ◽  
Centrifugal Impeller ◽  
Experimental Measurements ◽  
Suction Surface ◽  
Streamline Curvature ◽  
Through Flow

The streamline curvature through-flow analysis of a centrifugal impeller passage flow has been modified to include a flow model with a wake on the suction surface. With this model, empirically determined or measured impeller conditions can be matched without requiring a distributed stagnation pressure loss within the passage. Its use in impeller design is presented and comparison with experimental measurements from two impellers illustrate the utility of this approach. A brief discussion of experience with the associated forms of curve fitting and streamline smoothing required for the analysis solution is included.

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