In this paper, a novel particle swarm optimization (PSO) algorithm is proposed in order to improve the accuracy of traditional support vector machine (SVM) approaches with applications analyzing data oil pipeline leak detection. saturated and mix-delayed (SMDPSO) algorithm, evolutionary state determined by evaluating factor each iteration, based on which velocity updating model switches from one another. With purpose reducing possibility getting trapped local optima also expanding search...

A drive-by method is proposed to identify the modal frequencies of railway bridges from dynamic responses two-axle vehicles. The theoretical closed-form solution and frequency components vehicle response are derived based on vehicle–bridge interaction (VBI) model composed a simply supported bridge. time-domain subtraction (TSM) improved explained for two connected vehicles reduce effect track irregularity identification accuracy verified by finite-element (FE) analysis, indicating that both...

Accurate detection of pipeline leakage is essential to maintain the safety transportation. Recently, deep learning (DL) has emerged as a promising tool for (PLD). However, most existing DL methods have difficulty in achieving good performance identifying types due complex time dynamics data. On other hand, initial parameter selection model generally random, which may lead unstable recognition performance. For this reason, hybrid framework referred parameter-optimized recurrent attention...

Bridge substructure failure has been responsible for numerous recorded bridge collapses, particularly small‐ and medium‐span bridges, so it is crucial to effectively monitor the performance of substructures efficient maintenance management. The current vibration‐based approaches quantitatively evaluating rely on in‐situ experiments with a multitude sensors or impact vibration test, making challenging implement long‐term online monitoring. This paper proposes an accurate, low cost,...

The condition of substructures in high-speed railway (HSR) bridges is crucial to the safety operation. However, research on evaluation HSR very limited. In this paper, a simplified model for single pier that considers effect pier–beam coupling will be proposed simulate multiorder vibrations local system by distributing mass beam top adjacent piers. A systematic procedure based and finite-element (FE) updating adopted modal analysis bridge substructures. Numerical simulations conducted...

Indirect bridge modal parameter identification using vehicle responses has been widely studied for two-dimensional model, while rare work is devoted to the indirect of spatial mode shape (BSMS). This paper proposes an effective procedure BSMS used T-girder bridges, in which closed-form solution derived based on contact-point response. The identified related components extracted from a running at different transverse positions bridge. detailed introduced, and feasibility method analyzed...

Drive-by methods hold tremendous potential for fast inspection and condition evaluation of bridges. However, most literature works focused on the bridge superstructures, applications drive-by approaches to substructures are quite rare. This paper numerically investigates feasibility detecting damage in high-speed railway (HSR) using measured bogie acceleration responses from passing marshaling trains. A indicator is developed as work done by change interaction force before after when vehicle...

The condition of joints in steel truss bridges is critical to railway operational safety. available methods for the quantitative assessment different types joint damage are, however, very limited. This paper numerically investigates feasibility using a probabilistic neural network (PNN) and finite element (FE) model updating technique assess bridges. A two-step identification procedure developed achieve localization severity assessment. series FE models with single or multiple damages are...

Bridge damage detection has attracted much attention recently. Most studies on of the high-speed railway (HSR) bridge neglect effect interlayer connection between track and bridge. This paper proposes a method for HSR using response-based sensitivity analysis trains. The is modeled as spatial track–bridge system, in which fasteners, sleepers slabs are one viscoelastic layer. responses multiple vehicles merged to overcome critical issue that length response data recorded by vehicle moving...

In the paper, partial eigenstructure assignment problems are investigated using acceleration–velocity–displacement active control in a singular vibrating structure. The transformed into solving matrix equations receptance method. Iterative sequences constructed, and iterative feasibility is presented for equations. eigenvectors of closed-loop system reassigned by imposing modal constraints. An algorithm proposed to get numerical solutions derived initial value condition discussed obtain...