The adhesive joint is one of the efficient joining method in composite structures, and it important to comprehend behavior joints during impact order design stronger safer structures. This paper investigates residual strength CFRP single-lap (SLJs) after transverse using both finite element analysis (FEA) experimental methods. damage FEA model static tensile are established Hashin failure criterion cohesive zone model. results SLJs transferred restart method. models with different energies...

In this paper, an improved stiffness model of the breathing crack composite shaft tube was established based on Layer-wise theory, which considered influence orientation angle and stacking sequence cracked layers. Then, compared with horizontal neutral axis model, Mayes' analytical model. The results showed that can more effectively reflect laminate parameters stiffness. Based bending characteristics were studied, effects obtained.

The damping characteristics of the composite thick-walled hollow shaft directly affect its amplitude rotational vibration at low speeds and stability high speeds. In this study, is made carbon fiber reinforced plastic (CFRP) material. order to study shaft, a 3D numerical model was established based on finite element method strain energy expression. regard, both contributions in-plane out-of-plane dissipation were studied. Then, validity in bending verified by experiments. On basis, flexural...

Maritime safety has always been a topic of close interest to the shipping community. In order accurately grasp characteristics and key causative factors global maritime accidents, improve navigation safety, reduce occurrence accident data from 2014 2022 were collected processed Marine Casualties Incidents (MCI) module Global Integrated Shipping Information System (GISIS). Firstly, statistical analysis is used analyze temporal then Gaussian mixture model (GMM) clustering distribution...

The continuous development of global international trade has posed significant challenges to maritime security and safe transportation, highlighting the importance regulation. Traditional ship inspection techniques can identify locate vessels in images or videos, yet they often fall short meeting complex regulatory demands due specific operational needs risk assessment standards associated with different types ships. Consequently, this paper independently constructs a image dataset employs...

Fast 3D reconstruction of tool wear from 2D images has great importance to measuring and objective evaluating condition, determining accurate change insuring machined part's quality. Extracting information zone based on monocular multi-color structured light can realize fast recovery surface topography wear, which overcomes the problems traditional methods such as solution diversity slow convergence when using SFS method stereo match multiple images. In this paper, a kind new illuminator was...

Port State Control (PSC) is of positive significance for strengthening ship safety, reducing pollution, and urging the implementation conventions, plays an important role in shipping industry. Detention, as option port state inspection, used to promote compliance ships with standards, but companies, it means economic losses caused by delays schedules. This study aims use ensemble learning method predict possible defect types detention possibilities main operating based on existing PSC...

As the last line of defense for marine safety, Port State Control (PSC) plays an important role in improving safety and protecting environment. In order to ensure consistency effectiveness inspection, this study uses a Bayesian Network construct PSC examines evolutionary analysis models. Based on data inspection Paris MOU from 2018 2021, conduct research existing main ship types. The results show that most types, methods can guarantee standardization even face public health emergencies;...

The nonlinear dynamics of the composite shaft rotor-bearing system are greatly affected by orientation angle layer and its proportion ply, i.e., ratio in laminate. This paper presents a dynamic analysis with pedestal looseness that considers oil film force looseness. Nonlinear phenomena including periodic, quasi-periodic, chaotic motions analyzed. results indicate stiffness damping coefficients tube can be influenced strongly laminate parameters, which turn affect instability speed rotor...

The internal damping has significant influence on the dynamic characteristics of carbon fiber reinforced plastic drive shaft. In this paper, a model single-span multi-disk shaft with elastic support is established based layer-wise theory, specific capacity model, and Euler–Bernoulli beam theory. takes into account physical factors such as rigid body displacement caused by deformation, gyroscopic effect concentrated mass disk, viscous shaft, lamination parameters. used to analyze natural...

Wireless Body Area Network (WBAN) node is usually powered by batteries, which energy limited and not easy to change frequently. A data compression energy-saving method proposed reduce the consumption of WBAN node, adopting Sparse Representation Classification (SRC) algorithm identify normal signal, using Compressed Sensing (CS) theory for signal sampling, compressed sent base station reconstruction. When physiological signals collected nodes are in range, need transmit signals, make convert...

Normalization load Measured value Kalman filtering Parameter correctionGM(1,1) grey prediction

In this paper, the Layer-wise theory was improve based on alternate characteristics of layer angle composite hollow shaft. The ±φ i laminate considered as minimum mechanical analysis element, which can effectively simplify stress coupling in analytical method. On foundation, a 3-D method bending stiffness < EI> for thick-walled shaft derived. CFRP specimens made same dimensions but different were used test. Then, calculated by beams, 2-D method, model and experiment compared. All...

High accuracy digitization and digital sensor parameters configuration are more complex. According to the principles of digitization, signal high technologies discussed applied load cell design. Orthogonal experiments method is adopted optimize configuration, ENOB (effective number bits) measuring results proposed be optimization comprehensive index. Test show that optimal scheme feasible effective. After analog synthesis precision achieves level OIML C6, resolution attains 0.2 uV/10mV,...

When resources are limited and the perception tasks time-constrained, if multiple request response at same time, it is easy to cause scheduling deadlocks in layer affect its access speed efficiency. This paper studies mathematical f eature expression method of task resource allocation when deadlock occurs layer. According conditions mutual exclusion, non preemption, hold, cycle waiting, a detection model hierarchical system based on time constraints adopted establish constraint relationship...

Abstract In this paper, the nonlinear dynamic of a composite rotor-bearing system with multi-degree-of-freedom are analyzed. The rotor is supported by sliding bearing, base loosening fault at one end. orthotropic anisotropy materials, oil film force and pedestal looseness fully considered. Then, motion equations established lumped mass model. Various phenomena compressing periodic, quasi-periodic chaotic motions results show that unstable in form instability low speeds high speeds. laminate...