Structural health monitoring is a topic of great concern in the world, and tunnel deformation one important tasks. With rapid developments traffic infrastructure construction, engineers need portable real-time system to obtain during construction. This paper reports novel method based on laser machine vision automatically measure multiple interest points real time effectively compensate for environment vibration, moreover it can overcome influence dusty dark low visibility. An automatic...

Abstract The high manufacturing cost of vanadium electrolytes is caused by the sluggish kinetics V 4+ to 3+ , which restricts commercialization all flow batteries (VFBs). Here, density functional theory calculations first reveal detailed reaction pathway and point out rate‐determined step desorption end product [V(H 2 O) 6 ] . Catalytic site engineering at molecular level can optimize adsorption energy boost kinetics. Furthermore, iron single‐atoms embedded nitrogen‐doped carbon nanotubes...

Error compensation technology offers a significant means for improving the geometric accuracy of CNC machine tools (MTs) as well extending their service life. Measurement and identification are important prerequisites error compensation. In this study, measurement system, mainly composed self-developed micro-angle sensor an L-shape standard piece, is proposed. Meanwhile, stepwise method, based on integrated model, established. one measurement, four degrees-of-freedom errors, including...

The micro-displacement measurement system with 2D/3D has become increasingly important in the field of scientific research and technology application. In order to explore application an optical surface measurement, a novel simple 2D method based on elliptical paraboloid was designed subjected experiment. takes advantage instead plane mirror structure autocollimator which been ameliorated adapt curved measurement. Through displacement light spot CCD (Charge Coupled Device) detector, target...

The present study introduces the implementation of steel pipes and friction dampers to optimize diagonal rod structure in conventional stereo garages, while also investigating their seismic suppression performance under vertical cyclic loading. results indicate that exhibit superior terms maximum deformation response displacement at each level, although they do not perform as well vertex acceleration bottom shear response. Consequently, five different arrangement schemes are proposed, with...

Abstract Frequent incidents of corrosion leaks in petrochemical process piping due to pitting necessitate a scientific assessment the distribution patterns and maximum degree corrosion. Such assessments are crucial for identifying potential risks ensuring safe stable operation equipment. This paper presents method evaluating extreme values based on inspection data, which includes following steps: acquiring modeling predicting with model, assessing pipeline Initially, systematic thickness...

In order to improve the accuracy of ultrasonic phased array focusing time delay, analyzing original interpolation Cascade-Integrator-Comb (CIC) filter, an 8× CIC filter parallel algorithm was proposed, so that and multichannel decomposition can simultaneously process. Moreover, we summarized general formula arbitrary multiple established delay system based on algorithm. Improving algorithmic structure, 12.5% addition 29.2% multiplication reduced, meanwhile speed computation is still very...

The ship movement is mainly affected by the circulation current in curve channel. In this paper, taken as research object, 3D model established and scientific numerical simulation carried out. order to study analyze difference, three models with different bending degrees are simulation. Finally, according results, measures for safe navigation proposed.

A gravity-type heat pipe boiling characteristics test rig was constructed to solve the dissipation problem of fuel cells during operation. The transfer water in a parallel plate under negative pressure at different inclination angles and flow density input are investigated. results show that: First, can dissipate some it is possible use for cell dissipation. Second, with certain range density, temperature all parts about 80 °C, small difference, which conducive safe operation cell. Third,...

In order to achieve the prediction and early warning of city gas pipe network leakage accidents, as well provide rapid precise support for emergency response such this study focuses on a Gaussian diffusion model applied large urban pipeline network. Specifically, it investigates gate wells, which are key nodes in network, develop model. The objective is analyze variation internal concentration wells determine range danger posed by external from wells. addition, Fluent simulation utilized...

Optical metrology has experienced a fast development in recent years—cross laser-pattern become common cooperative measuring marker optical equipment, such as infrared imaging equipment or visual 3D measurement system. The rapid and accurate extraction of the center point attitude cross-marker image is first prerequisite to ensure speed accuracy. In this paper, cross used marker, view high resolution project vulnerability adverse environmental effects, stray light, smoke, water mist other...

To obtain a method for measuring thread functional diameter, new probe based on the synthetic measurement principle is designed to quantify practical effect of each parameter in all axial sections. The probing element an slice standard with certain thickness; hence, has determined lead angle and curvature radius. When threads different diameters are measured by slices, maximum error caused radius can approach 99 μm according simulation results. solve this problem, model established analyzing...

In this paper, we propose a linear probabilistic data association (PDA) based signal detector for V-BLAST. The main idea is to utilize the principle of pre-whitening filter realize single symbol detection, similar virtual input and output (SISO) system, by removing effects past decisions. Simulation results show that our scheme can provide performance very close ML decoding with extremely low computational complexity.

The internal structure of off-axis three-mirror system is commonly complex. mirror installation error in assembly always affects the imaging line-of-sight and further degrades image quality. Due to complexity optical path system, straightforward theoretical analysis on variations extremely difficult. In order simplify analysis, an equivalent single-mirror proposed presented this paper. addition, mathematical model established accurate expressions coordinate are derived. Utilizing simulation...

Aiming at the problem of collective pursuit Multiple Unmanned Aerial Vehicles (multi-UAVs) against non-cooperative UAVs, a directional chase strategy based on Multi-Agent Deep Deterministic Policy Gradient(MADDPG) algorithm is designed by using deep reinforcement learning theory. By designing model, state variables, actoin variables and reward function, UAVs are trained to learn distributed Actor, centralized Critic structure. It verified simulation that proposed has higher efficiency while...

The future large-scale electric vehicles (EVs) are connected to the grid and participate in dispatching operation by controlling their charging behavior order avoid negative impact of large number EVs disorderly grid. Based on idea master-slave game, this paper proposes a regulation method which EV users set own cost quantity weight according State Charge (SOC), agents strategy for with objective minimizing system load variance maximizing revenue. residential case study verifies...

Optical and visual measurement technology is used widely in fields that involve geometric measurements, among such are laser vision-based displacement measuring modules (LVDMMs). The transformation coefficient (DTC) of an LVDMM changes with the coordinates camera image coordinate system during process, these affect accuracy LVDMMs full field view (FFOV). To give higher FFOV make them adaptable to varying demands, a new calibration method proposed improve FFOV. First, system, pixel...

Belt conveyors have been widely used in coal transportation, but theproblems caused by the movement of belt threaten theproduction efficiency mines, and also safety ofworkers.