With the rapid development and accelerated utilization of marine resources, multi-body floating systems have become extensively used in practical applications. This study examines coupled motions a side-by-side anchoring system for five fishing vessels harbor using ANSYS-AQWA. The is connected by hawsers equipped with fenders to reduce collisions between vessels. It designed operate sheltered wind-wave combined environment within Ningbo Zhoushan Port, China. Considering diverse types...

This work aims to help the designers make decisions in early stage of new product development. Design concept evaluation is very critical design process, it may affect later stages. However, facing uncertain circumstance, mostly, raw data are subjective and imprecise. proposes a novel approach solve this problem. The whole based on rough numbers, Shannon entropy, technique for order performance by similarity ideal solution method preference selection index method. Firstly, numbers entropy...

To avoid stick-slip vibration, one of the most important forms self-excited vibrations in deep hole drilling, this paper studies stability and bifurcation characteristics a drilling system based on two-degree-of-freedom discrete model. It is state-dependent delay model that could describe non-linear dynamic characteristic systems more accurately, compared with traditional constant models. In paper, linear analyses both are carried out. Hopf then performed by method multiple scales. The...

Abstract The intelligent classification of wear particles has remained a high priority research area for ferrography technology and industrial tribology. In this study, five deep convolutional neural network (DCNN) models are used identification seven kinds particles. Instead manually designing selecting the features, proposed DCNN realizes an end-to-end processing. Wear particles’ dataset is built by various tribology experiments. experimental results show that accuracy DenseNet121 on test...

The solution of shipbuilding enterprise ERP problem is proposed under the dimensional visualization environment. In VB environment, CATIA and Access database developed for second time, Digital Shipyard Resource Optimization module designed. System arrangement evaluated; load on production line, buffer capacity bottleneck are analyzed. fault repairing simulated; Mathematical statistics model used to analyze system's random process. performance analyzed different control strategies....

Rolling rotor compressor is a commonly used in air conditioning systems, and studying its internal dynamic characteristics plays an important role the vibration noise of systems. Due to integration motor shaft inside compressor, influence electromagnetic force needs be considered when analyzing dynamics compressor. This paper studies rolling considering not only bearing gas cylinder, but also rotor. Firstly, force, on are analyzed; Secondly, two degree freedom model established, obtained by...

As a useful technology, the horizontal drilling for underground coalmine has been applied in many fields such as gas drainage, water control, exploration and accurate borehole engineering. In this paper, annulus tubes are used to simulate fluid transportation process between rod casing tube when horizontally. The main goal of research is analyze effects eccentricity, velocity, outer length volume fraction on dynamic characteristics partially liquid-filled drillstring system. According...

Abstract In the era of big data, all kinds information around, how to effectively get others want and achieve recommendation is original purpose algorithm, traditional has collaborative filtering, content-based, model-based algorithm. Matrix factorization algorithm solves problems data sparsity low space utilization brought by dimensional explosion. ALS(Alternating Least Squares) one matrix only implemented in Spark, which line with computation method distributed computing. However, ALS,...

At present, kelp harvesting is mainly artificial harvesting. Artificial has a couple of problems, such as minimal efficiency, difficult labor, and short period kelp. Given the problems existing in Coupled with marine environment characteristics culture China, overall design scheme catamaran harvester was put forward. The ship adopts structure, which effectively guarantees buoyancy provides ample deck area. propulsion device crawler paddle wheel can prevent winding kelp, seagrass, breeding...

A hydrodynamic wind–wave combined power generation system is a new type of energy device that uses wind and ocean current to generate electricity. In this paper, the hydrodynamics was simulated in Fluent. The fluid–structure coupling simulation vortex vibration cylindrical oscillator realized using UDF dynamic mesh technology. Vortex-Induced Vibration (VIV) characteristics were analyzed, reliability numerical method verified by comparing amplitude trajectory eddy-excited with classic...

UAV-borne missile system is expensive and the cost of live-fire drill high. Replacing real training with virtual can greatly improve efficiency combat effectiveness. By extension, authenticity depends on visual simulation system. This article choose a certain type as research target, based study 3D modeling technology, model loading scene building technology so on, develop LabVIEW for missile. The has high fidelity lays good foundation operating