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Due to the Restriction of Hazardous Substances by European legislation, Lead free solders such as SAC305 have replaced the use of lead in the commercial electronic industry. Lead free (LF) solder joints, having lower ductility, often are the victims of early failures due to drop events. To improve the drop impact reliability of lead free solder joint, underfill and corner staking were apply to the...
Gearboxes are important components in industrial applications and its condition monitoring is relevant in industries for reducing costs and minimizing maintenance downtime. Diagnosing wear in gearboxes saves time to prepare appropriate corrective actions, and to ensure that the system does not deteriorate critically. Nowadays, for condition monitoring in gearboxes, vibration analysis is commonly used...
An innovative E-simulation model based on E-experiment for misalignment fault detection and diagnosis that are commonly observed in rotating machinery systems has been proposed in this paper. Coupling misalignment is a condition where the shafts of the driver machine and driven machine are not on the same center line. Non-coaxial misalignment may be either due to the parallel misalignment or an angular...
With the development of lead-free in electronic products, mixed soldering of lead-free component with lead solder is inevitable in high reliability electronic assembly. For the mixed assemblies, the primary task is to ensure the reliability of mixed solder joints. This study is aimed at finding out the harmonic vibration fatigue properties of plastic ball grid array (PBGA) mixed solder joints under...
With the development of lead-free in electronic products, mixed soldering of lead-free component with lead solder is inevitable in high reliability electronic assembly. For the mixed assemblies, the primary task is to ensure the reliability of mixed solder joints. This study is aimed at finding out the harmonic vibration fatigue properties of plastic ball grid array (PBGA) mixed solder joints under...
Board level package reliability under mechanical shock has always been a great concern for mobile electronic products. As a result of “short to market” demand for new electronic products, a great effort has always been made towards developing more efficient methods for reliability assessments. This paper presents a board level mechanical reliability test method based on harmonic vibration. Numerical...
Here, we propose a practical single pole double throw (SPDT)-structured radio frequency microelectromechanical system (RF MEMS) switch for RF applications. This SPDT switch has a very low insertion loss of 1.0 dB and a high isolation of 40 dB, up to 10 GHz. The fabricated switch is compact in size (5.2times3.0times1.8 mm3) with a Land Grid Array Package. The research and development of an RF MEMS...
A novel kind of MEMS micro-gyroscope, piezoelectric micromachined modal gyroscope (PMMG), is introduced in the paper. PMMG works with the special vibratory mode of solid material, and it is a kind of solid-state micro-gyroscope, which is different from micromachined vibratory gyroscope. There is no moving part and suspended structure in PMMG, and it is robust for the higher resistance to shock and...
Tunable diode laser spectroscopy (TDLS) can only be successfully implemented if a number of system characterization procedures and critical parameter measurements can be made accurately. These include: application of a wavelength/frequency scale to the signals recovered in time; measurement of the frequency dither applied to the laser; measurement of the relative phase between the laser power modulation...
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