A crack-propagation criterion is proposed in this paper for mixed-mode I–II fracture concrete. In criterion, crack propagation initiated when the difference between stress-intensity factor at tip caused by external force and that cohesive stress satisfies crack-initiation equation. On basis of a numerical method developed to simulate To verify three sets experimental data are selected: one obtained from self-conducted test other two collected literature. The results show calculated load...

A novel optical MEMS pressure sensor with a SU-8 microstructure is proposed. photoresist used to form the high aspect ratio structure on silicon wafer. The advantage of mainly lies in design separating sensing membrane deformation length change Fabry-Pérot cavity. principle measurement has been introduced. mechanical model analyzed and parameters are determined by simulation. fabrication process described. Experimental results demonstrate that reasonable linearity, sensitivity under...

This paper presents a detailed modeling and analysis of an inductive power transfer (IPT) system with passive matrix repeater. A high-order mathematical model is established to characterize the output by taking all mutual inductances among primary, secondary, unit cells repeaters into considerations. The used analyze relationship between operating frequency IPT 3 × study shows optimal frequencies corresponding maximum minimum exist owing interactions magnetic fields generated primary current...

This study investigated the impact of Lactiplantibacillus plantarum PC-004 (PL) and Kazachstania bulderi PY-1 (PY), selected from home-made Paocai, on physicochemical properties volatile flavor compounds fermented Pleurotus eryngii. P. eryngii, by PY, was maintained at about pH 5 throughout fermentation, while co-fermentation exhibited a higher acid production rate lower post-acidification value compared to mono-fermentation PL. The viable cell counts PY no difference between mono-...

This paper presents a fault diagnosis method for neutral point clamped (NPC) inverter using multi-resolution wavelet and Bayesian classifier. T All possible open-circuit failures arising from one single power device are considered. Bridge voltages used as measurement to classify the modes. The features extracted bridge by analysis, then inputs of classifier which identifies Simulation experiments prove feasibility diagnostic its advantages in good classification performance high reliability.

The small-signal lumped-parameter macromodels of electromechanical transducers are widely studied while the large-signal for equivalent circuit representation have seldom been studied. Based on transduction principles, presented by adopting nonlinear polynomial controlled sources SPICE in a way that each expression corresponds to related circuits. were used simplify structure. Two typical applications given which contain structures above transducers, and system-level simulations performed...

This paper presents a fault diagnosis method for neutral point clamped (NPC) inverter using multi-layer artificial neural network (MANN). The considered possible faults of NPC include the open-circuit occurring in one single device or more devices. upper, middle and down bridge voltages are adopted test signals because difficulties isolating some modes. A novel is proposed to diagnose all faults. Furthermore, principal component analysis (PCA) utilized reduce input size network. comparison...

In modern naval combat missions, the ability of warships communication to complete all distance is required, and provide adequate, stable reliable performance lines for shore, sea, air underwater environment, possess ways means resist harsh also requires use advanced technology, withstand strong electromagnetic interference destruction in sea battlefield environment. But influence wireless during field environment not only natural weather conditions, more important complex battles. On basis...

Chaos particle swarm optimization (CPSO) can not guarantee the population multiplicity and optimized ergodicity, because its algorithm parameters are still random numbers in form. This paper proposes a new adaptive chaos embedded (ACEPSO) that uses chaotic maps to substitute of classical PSO so as make use properties stochastic ergodicity search introduces an inertia weight factor for each adjust adaptively response fitness, which overcome drawbacks CPSO is easily trapped local optima. The...

Opening holes in construction structures is used often to allocate electrical or ventilating lines. However, it may result stress concentration and hence the reduction mechanical properties. In order manage these problems, an approach of preparing full-field aligned steel fiber–reinforced cementitious composites (FASFRC) around hole proposed maximize effect reinforcement fibers by aligning according direction local tensile stress. Thus, open-hole plate using FASFRC developed. The advantage...

A novel pressure sensor based on the Fabry-Perot interferometry and microelectromechanical system (MEMS) technology is proposed demonstrated. Light coupled into through a fiber. Dual-wavelength demodulation method used to analyze reflected optical signals compensate errors independent of wavelength. Theoretical analysis simulation results are presented. Experimental for measurements ranging from 0 Mpa 3 demonstrate reasonable linearity sensitivity.

Permanent magnet linear synchronous motor (PMLSM) driven inverted pendulum is a new member of present similar devices, various unexpected disturbances such as lag effect belt attached to cart and errors caused by rotary encoder while detecting the position can be eliminated or reduced small range.In this paper, ironless permanent experiment platform developed. The plant hardware in loop real time simulation control development system (Hardware-in-Loop, HIL)based on TMS320F2812DSP MATLAB, it...