Affiliations: Mechanical Technology Center, PCS, Motorola, 8000 W.
Sunrise Blvd., Fort Lauderdale, FL 33322, USA. Tel.: +1 954 723 8024; Fax: +1
954 723 5584; E-mail: [email protected] | Advanced Technology, Smart and Connected Products,
Motorola, 1500 Gateway Blvd., Boynton Beach, FL 33426, USA. Tel.: +1 561 739
3818; Fax: +1 561 739 3486; E-mail: [email protected] | Mechanical Technology Center, PCS, Motorola, 8000 W.
Sunrise Blvd., Fort Lauderdale, FL 33322, USA. Tel.: +1 954 723 3098; Fax: +1
954 723 5584; E-mail: [email protected]
Abstract: Explicit Dynamic Finite Element techniques are increasingly used for
simulating impact events of personal electronic devices such as portable phones
and laptop computers. Unfortunately, the elastically-dominated impact behavior
of these devices greatly increases the tendency of Explicit Dynamic methods to
calculate noisy solutions containing high-frequency ringing, especially for
acceleration and contact-force data. For numerous reasons, transient FEA
results are often improperly recorded by the analyst, causing corruption by
aliasing. If aliasing is avoided, other sources of distortion can still occur.
For example, filtering or decimating Explicit Dynamic data typically requires
extremely small normalized cutoff frequencies that can cause significant
numerical problems for common DSP programs such as MATLAB. This paper presents
techniques to combat the unique DSP-related challenges of Explicit Dynamic data
and then demonstrates them on a very challenging transient problem of a steel
ball impacting a plastic LCD display in a portable phone, correlating
simulation and experimental results.
