Dynamic Analysis of HSDB System and Evaluation of Boundary Non-linearity through Experiments

K. Chandrakar; P.L. Venkateshwara Rao; P. Rajendran; C. Satyanarayana

doi:10.14429/dsj.66.8936

K. Chandrakar Defence Electronics Research Laboratory, Hyderabad
P.L. Venkateshwara Rao Defence Electronics Research Laboratory, Hyderabad
P. Rajendran Defence Electronics Research Laboratory, Hyderabad
C. Satyanarayana Defence Electronics Research Laboratory, Hyderabad

DOI: https://doi.org/10.14429/dsj.66.8936

Keywords: Natural frequency, random vibration, finite element analysis, power spectrum density, printed circuit board

Abstract

This paper deals with mechanical design and development of high speed digital board (HSDB) system which consists of printed circuit board (PCB) with all electronic components packaged inside the cavity for military application. The military environment poses a variety of extreme dynamic loading conditions, namely, quasi static, vibration, shock and acoustic loads that can seriously degrade or even cause failure of electronics. The vibrational requirement for the HSDB system is that the natural frequency should be more than 200 Hz and sustain power spectrum density of 14.8 Grms in the overall spectrum. Structural integrity of HSDB is studied in detail using finite element analysis (FEA) tool against the dynamic loads and configured the system. Experimental vibration tests are conducted on HSDB with the help of vibration shaker and validated the FE results. The natural frequency and maximum acceleration response computed from vibration tests for the configured design were found. The finite element results show a good correlation with the experiment results for the same boundary conditions. In case of fitment scenario of HSDB system, it is observed that the influence of boundary non-linearity during experiments. This influence of boundary non-linearity is evaluated to obtain the closeout of random vibration simulation results.

Author Biographies

K. Chandrakar, Defence Electronics Research Laboratory, Hyderabad

Mr K. Chandrakar has graduated from MP Christian College of Engineering and Technology, Bhilai, Chhattisgarh, India in 2002 and received his Masters from IIT Madras, Chennai, in 2011. Currently working as Scientist-D in the structural analysis group in DLRL. He has carried out the structural analysis of the HSDB subsystem using FE tool.

P.L. Venkateshwara Rao, Defence Electronics Research Laboratory, Hyderabad

Mr P.L. Venkateshwar Rao has graduated from JNTU College of Eng. Hyderabad, India in 1997 and received his Masters from Osmania University College of Eng. Hyderabad, India in 2013. Currently working as Scientist at Defence Electronics Research Laboratory in 1992. He is a Member of Institute of Engineers (India). He has generated the solid modeling of the HSDB system.

P. Rajendran, Defence Electronics Research Laboratory, Hyderabad

Dr P. Rajendran received the BE in Mechanical Engineering from Madurai kamaraj University, Madurai, India in 1992, ME from Anna University, Chennai in 1998 and PhD from the Osmania University, Hyderabad in 2008. He is senior scientist at Defence Electronics Research Laboratory. He is the author and co-author of over 20 technical publications. He is core project member and configured the HSDB system with suitable mounting for PCB and enclosure.

C. Satyanarayana, Defence Electronics Research Laboratory, Hyderabad

Mr C. Satyanarayana has graduated from Osmania University, Hyderabad, India in 1995 and received his Masters from Regional Engineering College, Trichy, in 1997. He is senior scientist at Defence Electronics Research Laboratory. He is Member of Institute of Engineers (India). He is head of the structural analysis group in the lab. His contributions are providing suitable design approach, finalisation of configuration and development of mechanical hardware.