Vibration fatigue test and analysis methodology for flip chip solder joint fatigue life assessment have been developed by performing vibration tests with constant G-level and varying G-level input excitation. The linear cumulative damage analysis method (Miner’s rule) predicts non-conservative result for vibration fatigue life of flip chip solder joint. Finite element analysis (FEA) using a glo...

Vibrations are usually undesired phenomena as they may cause discomfort, disturbance, damage, and sometimes destruction of machines and structures. It must be reduced or controlled or eliminated. One of the most common methods of vibration control is the dynamic absorber. In this paper, the non-linear dynamics of a two-degree-of freedom vibration system including quadratic and cubic non-lineari...

Ultrasonic linear piezomotors have several advantages compared to electromagnetic motors in specific applications such as in high-vacuum conditions and where no magnetic field is allowed. These compact directdrive motors are fast, but low speeds and high-resolution positioning are difficult to obtain. On the other hand, several non-resonant piezosteppers were developed, resulting in very accura...

Orchestration of sensory-motor information and adaptation to internal or external, acute or chronic changes is one of the fundamental features of human postural control. The postural control system is challenged on a daily basis, and displays a remarkable ability to adapt to both long and short term challenges. To explore the interaction between support surface stability and Achilles tendon vib...

Recent research work on non-destructive testing (NDT) and structural health monitoring (SHM) for civil engineering materials and structures from the United States is described. Developments in three topic areas are discussed: non-linear analysis of ultrasound and vibration for concrete, internal imaging for concrete using two different data types and SHM and NDT for steel cables and tendons. In...

Abstract Purpose The objective of this paper is to investigate with simulations how non-linear spring and damper components isolators can be employed effectively reduce both the oscillations force transmitted ground in whole spinning range unbalanced rotating machines. Methods principal goal twofold. First, present a concise consistent formulation based on harmonic balance approach for vibratio...