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Grab structure performance will directly affect the reliability of the crane work. In this paper, we completed the structural design of the tower crane grab components, and analyzed the grab by finite element method in the most dangerous conditions. So The stress, strain and deformation value of the condition are obtained. Finding out the position of the grab most prone to damage and the defects of...
A typical constrained mixed-integer nonlinear program: truss sizing and shape optimization under multi-loading cases and complex constraints is investigated in this work. A laconic adaptive penalty function is employed to handle the structural stress and local buckling constraints. The Covariance Matrix Adaptation Evolution Strategy (CMA-ES) is adopted to update the structural design variables. The...
NBTI (Negative Bias Temperature Instability), which can degrade the switching speed of PMOS transistors, has become a major reliability challenge. Meanwhile, reducing leakage consumption has become major design goals. In this paper, we propose a novel transmission gate-based (TG) technique to minimize NBTI-induced degradation and leakage. This technique provides higher flexibility compared to the...
Cadmium, which possesses the character of lipid solubility, bioaccumulation and toxicity, is considered as the most hazardous heavy metal with abroad applications. Microorganism growing in cadmium-rich environment for a long time forms tolerance and resistance to cadmium.Adsorption and accumulation to heavy metal by cadmium tolerant bacteria are one of available measures to treat cadmium contamination...
In order to study crack mechanism in stress triaxiality and fracture design of structure steel, the fracture experiments and numerical simulations were performed on 8 Q345 notched bar. Test results showed that crack initiated at the edge of the hole and the minimum section of the notched bars, quickly propagating perpendicular to loading direction. And that had obviously shear fracture trace, the...
Shear strength of granulated rubber and loess mixtures were investigated through direct shear test to evaluate the possibilities of the used tire as a lightweight fill material in geotechnical engineering. Test results indicated that the shear strength increased dramatically, at the content range of approximately 30%, higher than either pure granulated rubber aggregates or pure compacted loess. The...
In present study, a backside-etched silicon chip with a polysilicon diaphragm flip-chip attached on a printed wiring board (PWB) and globally bumped on a FR4 substrate was investigated based on finite element analysis (FEA) for determining three key parameters of flip chip chip size packaging (FC-CSP), namely, the size of solder bump, the thickness of PWB substrate, with/without U8437-3 underfill...
Employing a new rectification circuit, a currentfed dual-inductor boost converter with current ripple reduction (DIBCRR) is presented in this paper. It features high voltage gain with smaller transformer turns-ratio, recovery of the transformer secondary leakage energy, low voltage stress on the rectifier diodes, and low input and output current ripples. Therefore, high efficiency and high power density...
In this study, the induced stresses during packaging processes for MEMS device with diaphragm (membrane) were investigated by finite element analysis (FEA). Moving parts in MEMS device usually are the most important structures relevant to performance of sensing and actuating, therefore, the residual stress and distortion due to the heterogeneous structures with mismatch coefficient of thermal expansions...
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