A novel water-lubricated stern bearing damping structure with self-adaptive performance is proposed to meet the load-balancing and vibration-damping requirements of bearings. This innovative comprises an elastic element a alloy layer. The facilitates static dynamic load sharing bearing, mitigates edge effects, ensures even distribution contact pressure along axial direction, enhances overall performance. Consequently, it prolongs service life minimizes friction-induced stimulation. layer...

For improving the drilling efficiency of polycrystalline diamond compact drill bit, a novel bit is presented with new rock-breaking method named as cross-scraping. In which referred to composite cutters are mounted on rotary wheels major cutting elements, and result, mesh-like scraping tracks formed in outer radial area bottom-hole. Rock-breaking causes both shearing fracture failure bottom-hole rock, will greatly increase prolong service life. By analyzing complex motion velocity...

Determining shear wave velocity is a critical technique in bender element tests, as it can be readily affected by near-field effects, reflection, and other factors. This study proposes new method based on the dyadic wavelet transform modulus maxima. Combining local maxima of approximate coefficients at fine decomposition levels an appropriate threshold value, proposed automatically detect target point. For validation, comparative among maxima, peak-to-peak, first arrival, cross-correlation...

Abstract Artificial intelligence technology is the basic measure to ensure good operation of electrical automation control system electromechanical equipment. Because artificial widely used, it mainly uses auxiliary systems such as data real-time monitoring, acquisition and mining in The application acquisition, which integrates analyzes generated production process During equipment, extensive, amount calculation large analysis complex. Once equipment fault occurs, easy affect even business...

A suddenly pump stop in multi-pump parallel connection system could induce water hammer which may cause serious accidents. To prevent harm, comparing experiments was carried out to study the phenomenon lift closing check-valve adopted and shuttle check valve system. The result indicates that, greatly cuts peak-value produced by stop-pump impulsion, reduces probability of bringing a devastating accident.

Jiangsu province is located in China's east coast with a long coastline, which endows the rich wind resources. The total installed capacity of power has reached 648.25 MW by end 2008. Up to now, initially established an industrial chain its leading place domestic manufacturing industry equipment, providing strong support for low-carbon featured chlor-alkali bases non-grid-connected power. As energy-intensive industry, benefit subject amount and price energy supply. large-scale application...

With the deepening of marine development activities, human-related sea-related behavior has gradually moved from shallow sea to deep sea. In this paper, environment thruster bearing space station is characterized by high pressure, corrosion, large amount microorganisms and sediment. The Modified UHMWPE developed, friction under simulated seawater conditions studied using different proportions samples. experimental results show that materials developed in study have lower coefficient better...

On the basis of structural features and working principle polycrystalline diamond compact–roller hybrid drill bit, a detachable experiment device with adjustable parameters are designed manufactured for accordingly, drilling experiments under different conditions conducted. The results show that, first, introduction cones is beneficial to increasing penetrating ability compact cutters in hard formation, which significant improve rock-breaking efficiency. Second, torque bit obviously lower...

Flood front is the jump interface where fluids distribute discontinuously, whose condition theoretical basis of a mathematical model multiphase flow in porous medium. The conventional at expressed as continuous Darcy velocity and fluid pressure (named CVCM). Our study has inspected this conclusion. First, it revealed that principle mass conservation no direct relation to conservation, former not true foundation later, because only reflects kinetic characteristic particles one position(the...

Free‐piston engine generator is a new type of hybrid power device and regarded as the next‐generation energy conversion which can replace traditional internal combustion engine. This paper focused on stability combines experimental results to study key factors affecting free‐piston engine, such ignition time, intake pressure, equivalence ratio, operating frequency. The simulation showed that advance angle increased, indicated mean effective pressure increased significantly coefficient...

Fault diagnosis for quality control during the multivariate production process is widely used to detect abnormal fluctuations, find out failure reasons and take measures maintain stability of system accordingly.The neural network methodology has become a main method in field intelligent recently.However, it certain deficiencies such as longer training time, slower convergence rate easier falling into local optimal solution easily.As result, effect fault diagnose influenced.Thus, this article...

In this paper, the structure of cylindrical shell with a reinforced circular cutout using combination model solid element and was analyzed by Finite Element Method (FEM) simulations. Multipoint constraint (MPC) method is mainly used to solve connection between when considering calculation accuracy efficiency model. The established in ANSYS, has been compared element. result showed that aspects stress distribution pressure hull near cutout, buckling behavior its instability response, almost...

The cavitation phenomenon and shaft deformation have a significant impact on the tribological performance of journal bearing. A mixed lubrication model is developed that takes into account surface roughness asperity contact, as well effects deflection. fluid–solid coupling effect in bearing deformation, film pressure are investigated. boundary conditions regimes discussed. results simulations with without compared under steady-state conditions. show when considered by given load,...

Noise caused by vibration in ship’s seawater piping system can easily transfer outboard. This will destroy the stealth of some military ships for especial purpose. In this paper, experiments were carried out to investigate pipe under prompting pump a testing platform. The transmission character along pipeline is researched and isolation effects shock absorption bracket flexible rubber bellows analyzed. Based on results, advices given resisting system.

This article mainly expounds on the connotation of index evaluation system large-scale, non-grid-connected wind power industry and its construction principles, determines levels scientific significance calculation method each index, conducts case analysis in accordance with constructed system. The is divided into two levels: (1) first level includes macro groups four aspects, respectively reflecting characteristics economy, society, environment, random fluctuation power; (2) second reflects...

Floating nuclear power stations are vessels with reactors, designed to offshore oil and gas drilling, island development remote areas. The safety of the facilities is an important issue. Leak-Before-Break (LBB) assessment essential design evaluation plants against a sudden double-ended guillotine break pipes. This paper describes LBB procedure applicable nuclear-class pipe floating station. loads considered in analysis include variation temperature/pressure, swing underwater impact....

With advanced high-strength steels and high value-added development, it is very important to improve the cooling capacity intensity of run out table system. The key technology break vapor between hot strip cold water increase direct contact area. In order realize ultra fast cooling, Laboratory research such as jet nozzle type selection diameter decision factory tests testing have been done. Experiment results show that circular has bigger hitting power than fan-type nozzle. However, drainage...

Abstract The numerical simulation analysis of the fluid-solid coupling ship’s boring water-lubricated bearing is carried out to study influence law inclination and eccentricity rotating shaft on pressure distribution fluid flow state in bearing. results show that tilt changes shape inner passage bearing, resulting unstable When normal, value decreases first then increases axial direction. However, after rotation tilted, change opposite; stress rubber layer generally shows an increasing trend...

In order to solve the problems of oxygen deficient combustion and poor mixing effect in W-flame boiler, a new type dynamic field was put forward, which straight flow tertiary air-ejecting changed into swirl flow, cold model boiler filed simulated by FLUENT this paper. For purpose assessing mechanism aerial field, concept factor introduced describe behavior established according particle's velocity turbulence, density distribution relative whole space. Simulation results show that has such...