To investigate the dynamic characteristics of a self-anchored suspension bridge (i.e. Tianjin Fumin Bridge), real time kinematic-global navigation satellite system (RTK-GNSS) is used to achieve displacement responses structure. Seeing defect in positioning accuracy RTK-GNSS, combined method (EEMDWP) ensemble empirical mode decomposition (EEMD) and wavelet packet (WP) analysis firstly put forward improve precision vibration signals. Subsequently, fast Fourier transform random decrement...

This article aims to develop a hybrid approach of complementary ensemble empirical mode decomposition (CEEMD) and random decrement technique (RDT) for identifying the modal parameters (i.e., natural frequency damping ratio) structures using high-rate (50 Hz) global navigation satellite system real-time kinematic (GNSS–RTK) measurement data. The framework proposed included two stages: (1) CEEMD was first used derive set single-component signals, called intrinsic functions (IMFs); (2) RDT...

This article aims to investigate the dynamic characteristics (e.g. natural frequency and damping ratio) for two super high-rise completed uncompleted buildings. Real-time kinematic-global navigation satellite system technology is applied observe responses. To improve positioning accuracy avoid distortion of results, a Type 1 Chebyshev high-pass digital filter used. The frequencies ratios buildings are determined using fast Fourier transform analysis random decrement technique combined with...

The 128-bit SM4[1] cipher is the first commercial algorithm published by China in 2012, which mainly used WLAN. Comparing with conventional approaches, additive masking adopted to resist DPA (Differential Power Analysis) attack, and PPRM circuit structure reduce power consumption for SM4 S-box. Simulation results show that design has a 50% reduction 44% delay at cost of area 20% increased using SMIC 0.18μm technology. Two sets 2000 plaintext inputs are attack. resistance S-box reliable....

Fiber-reinforced materials have widespread applications, which prompt the study of effect fiber reinforcement. Research studies indicated that thermal conductivity cannot be considered as a constant, is closely related to temperature change. Based on those studies, we investigate fiber-reinforced generalized thermoelasticity problem under stress, with consideration temperature-dependent variable conductivity. The assessed according L-S theory. A anisotropic half-space selected research...

Under the action of wind, traffic, and other influences, long-span bridges are prone to large deformation, resulting in instability even destruction. To investigate dynamic characteristics a concrete-filled steel tubular arch bridge, we chose global navigation satellite systems-real-time kinematic (GNSS-RTK) monitor its vibration responses under ambient excitation. A novel approach, use complete ensemble empirical mode decomposition with adaptive noise combined wavelet packet (CEEMDAN-WP) is...

Xiong, C.; Li, Z.; Sun, X.; Zhai, J., and Niu, Y., 2018. An effective method for submarine pipeline inspection using three-dimensional (3D) models constructed from multisensor data fusion.Submarine pipelines are of great importance to resource delivery in the oceans, but they sensitive a wide variety damage defects. In development, life cycle monitoring is most solution ensure normal operation pipelines, periodic surveying adopted as main maintenance tasks. Recently, approaches based on...

To capture the dynamic characteristics of a super high-rise structure under construction (i.e. Tianjin 117 Tower), multi-constellation GNSS-RTK (global navigation satellite system – real time kinematic) sensors are employed to derive displacement information structure. A combined approach (CEEMDAN–WT) complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) and wavelet threshold (WT) technique is put forward weaken influence background sensors. For sake testing effect...

Abstract Compared with acceleration-based modal analysis, displacement can provide a more reliable and robust identification result for output-only analysis of long-span bridges. However, the estimated displacements from acceleration records are frequently unavailable due to unrealistic drifts. Aiming at obtaining accurate stable results determining parameters, this study develops multi-rate weighted data fusion approach estimating responses in dynamic monitoring structures based on global...

Abstract Aiming at the problem of low intelligent level shearer, a shearer cutting pattern recognition method is proposed based on combination multi-scale fuzzy entropy, Laplace score and support vector machine. By extracting entropy vibration signal under different modes, feature representing mastered. At same time, used to select vectors with possessing rich information. The selected features are produced as learning samples experimental system coal-rock built, signals rocker arm patterns...

The generalized thermoelastic diffusion problem with temperature-dependent properties is investigated in the context of theory diffusion. results show that all considered variables have a non-zero value only bounded region and vanish identically beyond this region, act to reduce variables.

Time-to-Digital converter (TDC) is one of the high-precision time measurement techniques. The design a TDC chip presented in this paper. This occupies cyclic tapped delay line which forms ring oscillator. Several functions are supported, include Range1, Range2, self-calibration and temperature measurement. implemented 0.18 μm 1P5M CMOS logic technology. Test results show resolution 52 ps. dynamic power current 1.5348 mA, static 116.5706 μA at 25°C 3.3 V I/O, 1.8 core voltage. can be used...

Traditional modal identification approaches require too much user interaction, which results in low implementation efficiency. This study develops an automatic approach that combines deep learning and blind source separation to determine the parameters of structures. The core object proposed is establish a multi-task neural network (MTDNN) enables it automatically obtain independent modes from multi-mode vibration responses Then frequencies damping ratios structures can be extracted by...

SM4 is a 128-bit block cipher used in SOC and smart cards to ensure the safety of data transmission. In order realize low power implementation block, some S-boxes were evaluated firstly we proposed new architecture S-box called MUX with consumption 13.92W@10Mhz on SMIC 0.18m technology, Meanwhile, round based was completed 0.33mW @ 10 MHz 0.18 m CMOS technology achieved.

Abstract This work aims to identify the dynamic parameters (i.e. natural frequencies and damping ratios) of a super tall building under construction (i.e., Tianjin 117 Tower). Real time kinematic - global navigation satellite system (RTK-GNSS) receivers are applied monitor vibration structure. Considering errors receivers, joint denoising method is proposed weaken influence noise. Meanwhile, random decrement (RDM) fast Fourier transform (FFT) adopted derive Moreover, identified results from...