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The paper investigates the problem of degenerative model of board-level solder joint subjected to harmonic vibration load with the constant frequency fixed amplitude. Based on the experimental monitoring signal, square root amplitude, waveform factor and kurtosis factor can be used as the degradation quantity by analyzing ten amplitude domain statistics' correlation and significance. Square root amplitude...
I. MOTIVATION FOR RESEARCH Recently, the use of high-speed permanent magnet synchronous motors (PMSMs) has become prominent owing to their high efficiency, simple structure, high power density, and small size [1–2].
48 samples of sandy-rock mixture were tested and analyzed by means of a self-made vibratory compaction apparatus. the relationships between dry density, stone content, water content and longitudinal wave velocity, shear wave velocity, longitudinal-to-shear wave velocity ratio were further discussed of these samples. According to the experiment, linear correlation is significant not only in the relationship...
To detect the effects of internal hole-defects location on the propagation parameters of acoustic wave in the wood, forty maple wood samples used as the study objects are tested by using PLG (Portable Lumber Grader) instrument in this paper. The propagation velocity and vibration frequency of acoustic wave in intact wood and defective wood were compared, and then the correlation between the propagation...
Driven by the trends towards miniaturization and increased functionality, modern electronic systems are being built into more intricate and smaller packages. The mechanical robustness of these smaller and more complex packages is of great concern to the electronics industry. With advances in packaging technology, more reliable interconnects are being designed as a result of which the accountability...
The method of account of internal dispersion of energy is offered. On the example of two electromechanics transformers verification of its fitness is realized to the practical calculations and subsequent design after other criteria. Certainly method of quantitative and high -quality estimation of transformers after dispersion energies, found them main power parameters.
This paper presents a structural health monitoring system for monitoring, with reduced visual impact, one historical building structure. The system is based on fiber Bragg gratings and comprises 19 displacement sensors and 5 temperature sensors. All the sensors were custom made according to the monitoring points' characteristics. The results obtained over the first year of monitoring are presented...
Decreasing the length of thermoelectric (TE) module legs results in a significant increase in power density, both for cooling applications and electricity generation. However, this reduction also results in a significant increase of mechanical stress in the legs materials. Thus, it is important to implement an effective method to characterize the mechanical properties, such as mechanical spectroscopy,...
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