Predictive Modeling of the Dynamic Response of Electronic Systems to Shocks and Vibrations

2010 ◽  
Vol 63 (5) ◽  
Author(s):  
E. Suhir
Keyword(s):  
Dynamic Response ◽  
Predictive Modeling ◽  
Printed Circuit Boards ◽  
Nonlinear Behavior ◽  
Electronic Systems ◽  
Circuit Boards ◽  
Element Analysis ◽  
Portable Electronics ◽  
Flexible Printed Circuit ◽  
Board Level

The published work on analytical (“mathematical”) and computer-aided, primarily finite-element-analysis based, predictive modeling of the dynamic response of electronic systems to shocks and vibrations is reviewed. Understanding the physics and the ability to predict the response of an electronic structure to dynamic loading has been always of significant importance in military, avionic, aeronautic, automotive, and maritime electronics. For the past decade, this problem has become important also in commercial, and, particularly, in portable, electronics in connection with accelerated testing on the board level of various surface-mount technology systems. The emphasis of this review is on the nonlinear behavior of flexible printed circuit boards experiencing shock loading applied to their support contours.

STRUCTURAL DYNAMICS OF ELECTRONIC SYSTEMS

2013 ◽  
Vol 27 (07) ◽  
pp. 1330004 ◽  
Author(s):  
E. SUHIR
Keyword(s):  
Dynamic Response ◽  
Printed Circuit Boards ◽  
Impact Load ◽  
Electronic Systems ◽  
Circuit Boards ◽  
Element Analysis ◽  
Highly Nonlinear ◽  
Flexible Printed Circuit ◽  
Nonlinear Shock ◽  
Drop Tests

The published work on analytical ("mathematical") and computer-aided, primarily finite-element-analysis (FEA) based, predictive modeling of the dynamic response of electronic systems to shocks and vibrations is reviewed. While understanding the physics of and the ability to predict the response of an electronic structure to dynamic loading has been always of significant importance in military, avionic, aeronautic, automotive and maritime electronics, during the last decade this problem has become especially important also in commercial, and, particularly, in portable electronics in connection with accelerated testing of various surface mount technology (SMT) systems on the board level. The emphasis of the review is on the nonlinear shock-excited vibrations of flexible printed circuit boards (PCBs) experiencing shock loading applied to their support contours during drop tests. At the end of the review we provide, as a suitable and useful illustration, the exact solution to a highly nonlinear problem of the dynamic response of a "flexible-and-heavy" PCB to an impact load applied to its support contour during drop testing.

Stress Analysis of Printed Circuit Boards With Highly Populated Solder Joints and Components: A Micromechanics Approach

1996 ◽  
Vol 118 (2) ◽  
pp. 87-93
Author(s):  
K. X. Hu ◽  
Y. Huang ◽  
C. P. Yeh ◽  
K. W. Wyatt
Keyword(s):  
Stress Analysis ◽  
Printed Circuit Boards ◽  
Solder Joints ◽  
Effective Properties ◽  
Mechanical Analysis ◽  
Computational Effort ◽  
Circuit Boards ◽  
Element Analysis ◽  
Printed Circuit ◽  
Board Level

The single most difficult aspect for thermo-mechanical analysis at the board level lies in to an accurate accounting for interactions among boards and small features such as solder joints and secondary components. It is the large number of small features populated in a close neighborhood that proliferates the computational intensity. This paper presents an approach to stress analysis for boards with highly populated small features (solder joints, for example). To this end, a generalized self-consistent method, utilizing an energy balance framework and a three-phase composite model, is developed to obtain the effective properties at board level. The stress distribution inside joints and components are obtained through a back substitution. The solutions presented are mostly in the closed-form and require a minimum computational effort. The results obtained by present approach are compared with those by finite element analysis. The numerical calculations show that the proposed micromechanics approach can provide reasonably accurate solutions for highly populated printed circuit boards.

Ultrasonic Bonding of Electrodes of Rigid and Flexible Printed Circuit Boards with Non-Conductive Film (NCF)

2009 ◽  
Vol 85 (6) ◽  
pp. 341-350 ◽  
Author(s):  
Jong-Bum Lee ◽  
Ja-Myeong Koo ◽  
Jong-Woong Kim ◽  
Bo-In Noh ◽  
Jong-Gun Lee ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Ultrasonic Bonding ◽  
Conductive Film ◽  
Flexible Printed Circuit

Forced Response and Random Vibration Analysis of Printed Circuit Boards

2000 ◽  
Author(s):  
James F. Tarter
Keyword(s):  
Random Vibration ◽  
Printed Circuit Boards ◽  
Random Excitation ◽  
Forced Response ◽  
Circuit Boards ◽  
Element Analysis ◽  
Design Data ◽  
Improve Design ◽  
Printed Circuit ◽  
Contour Plots

Abstract Finite element analysis has been used in conjunction with developed algorithms to analyze forced response and random vibration response of printed circuit boards. Analytical predictions have been compared to random vibration test data for model correlation and validation of the analysis methods. The described methods provide design data for predicting deflections and G levels as a function of frequency or predicting RMS levels for random excitation. These data are utilized for initiating design changes and guiding component placement. Deflection versus frequency contributions for random excitation are analyzed to identify critical design frequencies. Forced response contour plots include effects of modal coupling, modal participation factors, and system damping. These data provide a better description of the expected operating deflection shapes man a simple mode shape. All of these methods are used to improve design integrity and ensure specification compliance prior to hardware fabrication. The analyses utilize aggregate board properties, and do not currently provide data for individual components which are installed on the board.

An Educational Scheme for a CNC Drilling Machine

2012 ◽  
Vol 2 (2) ◽  
pp. 1-11 ◽  
Author(s):  
Salah Haridy ◽  
Zhang Wu ◽  
Amro Shafik
Keyword(s):  
Printed Circuit Boards ◽  
Numerical Data ◽  
Numerical Control ◽  
Electronic Systems ◽  
Parallel Port ◽  
Circuit Boards ◽  
Cnc Machine ◽  
Printed Circuit ◽  
Stepper Motors ◽  
C Program

Computer numerical control (CNC) involves machines controlled by electronic systems designed to accept numerical data and other instructions, usually in a coded form. CNC machines are more productive than conventional equipment and consequently produce parts at less cost and higher accuracy even when the higher investment is considered. This article proposes an educational scheme for designing a CNC machine for drilling printed circuit boards (PCB) holes with small diameters. The machine consists of three-independently move-fully controlled tables. Output pulses from the personal computer (PC) parallel port are used to control the machine after processing by an interface card. A flexible, responsive and real-time visual C # program is developed to control the motion of the stepper motors. The educational scheme proposed in this article can provide engineers and students in academic institutions with a simple foundation to efficiently build a CNC machine based on the available resources.

Mechanical Test of FPCB and Failure Analysis by Simulation

2009 ◽  
Author(s):  
Jian Zhong ◽  
Ping Yang ◽  
Jian-ping Li ◽  
Hai-bo Sun ◽  
Quayle Chen ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Printed Circuit Boards ◽  
Simulation Analysis ◽  
Mechanical Test ◽  
Mechanical Tests ◽  
Stress Distributions ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Depth Analysis ◽  
Flexible Printed Circuit

The paper mainly presented mechanical test and failure analysis methods to reliability study of a new FPCB (Flexible Printed Circuit Boards). Mechanical tests include flexural test, tensile test and flexural fatigue and ductility test. As to simulation analysis, the stress distributions of FPCB under bending and tensile conditions were gained by simulations. Through in-depth analysis of the testing results, the mechanical reliability of FPCB was known detailed. The research provides an approach to improve FPCB performance.

Longitudinal Ultrasonic Bonding of Electrodes between Rigid and Flexible Printed Circuit Boards

2008 ◽  
Vol 47 (5) ◽  
pp. 4300-4304 ◽  
Author(s):  
Jong-Bum Lee ◽  
Ja-Myeong Koo ◽  
Soon-Min Hong ◽  
Hyoyoung Shin ◽  
Young-jun Moon ◽  
...  
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Ultrasonic Bonding ◽  
Flexible Printed Circuit
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