Structural health monitoring (SHM) has received increasing attention in the research community over past two decades. Most of relevant focuses on linear structural damage detection. However, majority civil engineering structures is nonlinear, such as fatigue cracks that open and close under dynamic loading. In this study, a new hybrid AR/ARCH model field economics proposed indicator (DI) which second-order variance (SOVI) based have been used for detecting nonlinear damage. The data from an...

Automatic anomaly detection has always been a very important and challenging subject, which strongly affects product quality. This paper, proposes novel weakly supervised ensemble learning based framework for automated pixel-wise detection, enables the model to be trained using only small quantity of labelled samples, instead hundreds or thousands more, meanwhile it maintains excellent performance in practical applications. Specifically, first, synthesized defects with random shapes, texture...

A roof-top scaled experimental wind turbine was simulated in FLUENT. Meshing technique for blades studied and a suitable mesh achieved. The SST k-ω model set to be the turbulence Detailed settings were maintain convergent more accurate simulation. simulation predicted power coefficient different tip speed ratios. flow field around blade, pressure distributions also analyzed. results compared with its data, showing an agreement. comparison validated method, proving that meshing setting...

Soil cave foundation is a common type in the soil karst area, stability of will be directly affected by collapse destruction.Currently, evaluation mostly focus on quantitative evaluation, such as mechanism and prevention, while qualitative assessment rare.Based plastoelasticity theory, firstly analyze stress state wallsurrounding body foundation, distinguish concentration influence then improve computation model using Molecoulomb strength criterion, finally, take example Tongren Guizhou,...

Based on the blade element momentum(BEM) theory,the power coefficient of a wind turbine can be expressed in function local tip speed ratio and lift-drag ratio.By taking predefined range angle attack as final design objective combining with an airfoil noise prediction model,the previously developed integrated technique is further developed.The new code takes into account different requirements according to their positions blade,such sensitivity leading edge roughness,design lift at off-design...

This article aims to use the design method of systematic safe operation area study improving reliability mining crawler converter. Firstly, based on introduction concept device, a mathematical modeling analysis carried out for back-to-back converter such as Secondly, selection formula IGBT is provided, and operating parameters device are optimized according redundancy power devices, so maximize utilization rate devices while ensuring safety system.

Recently, deep-learning-based methods have achieved excellent performance in semiconductor wafer defect inspection. However, these trained networks are only effective for a certain background pattern and fail transfer detection between multiple patterns. Once the has changed, images needed to be recollected relabeled, which is very time-consuming. To achieve wafers, novel prototype learning (PL)-based network proposed this article. First, multiscale residual fusion module (MSRFM) elaborately...

Soil cave foundation is common in Karst area, which damage would impact the stability of foundation. Currently, qualitative analysis collapsed mechanism has been done, but few quantitative. Based on theory elasticity and plasticity, stress condition influence circle concentration around researched. The calculated model modified by Mohr-Coulomb criterion. feasibility reliability proved example Guizhou province. And researched effect size, depth foundation, shape groundwater to causing or not....

Reservoir water fluctuation and rainfall are the main factors to trigger landslides in Three Gorges reservoir area. It is key study landslide three-dimensional seepage under for stability evaluation, disasters prevention reduction. We investigated Lijiawan Landslide reservoir, Badong Country, Hubei Province, China. And propose a Topology intelligence method calculate Three-dimensional of landslide. In order rapidly, we developed computer program by Visual Basic, which combined ANSYS, Finite...

3d landslide geological modeling is the prerequisite of geotechnical and engineering geology numerical simulation analysis, there have not been very direct efficient software tools to realize this process currently. Taking account this, a new method posed from an integrative view in paper. First, extract origin data specific its DXF file, then generate terrain surface sliding grid by gird interpolation Surfer software. Second, create solid files APDL language, input them ANSYS element...