Accurate deformation prediction is crucial for ensuring the safety and longevity of bridges. However, complex fluctuations pose a challenge to achieving this goal. To improve accuracy, bridge method based on bidirectional gated recurrent unit (BiGRU) neural network error correction proposed. Firstly, BiGRU model employed predict data, which aims enhance modeling capability GRU time-series data through its structure. Then, extract valuable information concealed in error, transformer...

The surface of the aluminum alloy is prone to oxidation, which in turn affects quality weld. 5A12 was cleaned by acousto-optic Q-switched diode-pumped Nd:YAG laser and effects different powers cleaning speeds on roughness, microstructure, element content, microhardness, residual stress corrosion resistance were investigated. results show that when power 98W speed 4.1 mm/s, effect Nd: YAG removal oxide film most effective. After cleaning, smoothness strength can be effectively improved....

ZnO film ultrasonic transducers for temperature and stress measurements with dual-mode wave excitation (longitudinal shear) were deposited using the reactive RF magnetron sputtering technique on Si stainless steel substrates construction bolts. It was found that position in substrate plane had a significant effect structure performance of transducers. The at center deposition zone demonstrated straight columnar c-axis parallel to normal generation longitudinal waves. edge inclined structures...

The semi-airborne transient electromagnetic (SATEM) method has garnered increasing attention and research interest due to its superior detection depth high efficiency. Theoretically, the SATEM employs a long straight grounded wire as transmitter source; however, in practical applications, various source shapes emerge terrain constraints. This paper investigates influence of shape on data. A three-dimensional (3D) block model is established, order reduction algorithm applied calculate 3D...

This paper presents a new method of postweld treatment. The 5154 aluminum alloy was cleaned by Nd:YAG laser after welding. surface morphology, energy spectrum, friction and wear properties, hardness, residual stress the welded joint at different cleaning speeds were studied. results show that an can effectively remove welding slag eliminate pores in weld under certain speed. When speed is range 5.2–20.7 mm/s, improve heat-affected zone’s tribological characteristics. Laser joint’s strength,...

Traditional research on the train control problem use determined model and method cannot deal with variable parameters in complex environment. This paper proposes a new approach by analyzing operation data reinforcement learning instead of using detailed model. Specifically, similarity-based sampling is introduced to sample segments data, which used predict running state train. With reward each segment for can be evaluated. Then, monte carlo applied select optimal solution decision. Finally,...

The influences of different laser power density in LSP (laser shock peening) on the corrosion performance biocompatible magnesium alloy ZK60 were researched via SBF (Simulated Body Fliud) immersion testing and electrochemical testing. Corrosion morphology products observed analyzed using SEM (Scanning Electron Microscope) outfitted with EDS (Energy Dispersive Spectrometer) XRD (X-ray Diffraction). Simultaneously, 3D morphology, surface roughness, residual stress, microstructure also...

This paper discusses the network security scanning and some methods which contain port scanning, vulnerability remote operating system detection are studied. In order to reduce complexity get high performance, architecture of a common based on Libnet Libpcap is provided every module designed implemented. The key modules include packet constructing, sending, capture, analyzing information log analysis module. injection capture presented it can improve performance enhance scalability...

The special sedimentary environments of conglomerate reservoir lead to pore structure characteristics complex modal, and the seepage system is mainly in “sparse reticular-non reticular” flow pattern. As a result, study on microscopic mechanism water flooding polymer their differences becomes part key enhance oil recovery. In this paper, actual core samples from Karamay oilfield are selected as research objects explore mechanisms for hydrophilic rock well lipophilic by applying Computed...

The transient electromagnetic (TEM) method is widely used in near-surface geophysical prospecting. high-precision forward and inversion of large-scale complex models a challenging problem. It difficult to solve the problems using direct solvers due large memory requirements. In this article, we present restarting polynomial Krylov for modeling 3-D TEM responses. mimetic finite volume carried out spatial discretization. step-off response then can be expressed as matrix exponential function....

For distributed generation systems, virtual synchronous generators (VSGs) can reduce the inertia of overall power system. However, distorted grid voltage degrades quality VSG grid-connected currents, and existing methods based on PCC feedforward are limited due to effect control bandwidth equivalent impedance. To address this issue, paper reveals relationship between harmonic currents voltage, explains essential causes current generation. This feeds forward capacitor in a specific proportion...