Sea locks that connect inland canals and rivers to the open sea are crucial links ensure efficient navigation of ships. Floating bollards (FBs) significant components locks, they affected by factors such as large ships, speed entry, irregular mooring lines coupled with corrosion chloride salts from seawater intrusion environment. These aggravate damage metal structures, which seriously threatens safety FBs. Overloading FBs forces caused illegal use for braking ships enter at excessive is...

The numerical tools can be used to facilitate the design of railway pantograph‐catenary system. validation current results is mostly performed at a speed slower than 350 km/h. This paper aims and analysis super‐high‐speed. catenary model constructed based on nonlinear finite element approach employing absolute nodal coordinate formulation. A multibody dynamics adopted represent pantograph. measurement data are collected by an inspection vehicle equipped with instrumented pantograph operating...

Due to the large scale of navigation ships, fast speed entering lock, and irregular mooring complicated flow conditions in lock chamber, it is common for floating bollards suffer structural damage or even failure due overloaded force. However, traditional cable load measurement method cannot offer real-time feedback on force characteristics bollards, making difficult accurately judge its service status. To this end, according bollard structure type condition a representative ship project...

The icing phenomenon usually happens in Pantograph-catenary system winter, which would cause the intensifying of pantograph-catenary vibration and formation arc. Therefore, studying interaction between arc catenary is great significance. In this paper, model contact line set up utilizing ANSYS/Workbench, transient thermal analysis heating performed, correctness verified. Then finite element established, temperature distribution obtained. simulation results show that will erosion effect act...

When ship navigates at sea, collision avoidance of ship’s speed alteration is frequently adopted by officer on watch in order to prevent from forming situation with target ship(s). Bacterial foraging algorithm (BFA) that imitates the social behavior Escherichia coli an optimal search method suitable for complex problems. This research adopts bacterial find strategy economical viewpoint, combining international regulations preventing collisions sea (COLREGS) and safety domain ship. An time...

Due to the sea water intrusion and development trend of using large-scale ships, more stringent requirements are put forward for safety delivery process mooring equipment operation shiplock. The maximum loads shiplock, i.e., floating column (FMC), generally occurred at end delivery. superimposed effect turbulent flow marine corrosive environment can accelerate failure structure which leads incidents, including structural damage FMC breakage lines ship, etc. is mostly influenced by three...

With the rapid development of High-speed railway and Electric power system in China, Electrification special 27.5 kV feeder cable has been widely used domestic railway. When AC current flows through conductor cable, shielding layer will generate a corresponding induced electromotive force which magnitude is mainly proportional to length value conductor. on sheath too large, it may cause grounding fault endanger safety people equipment, so necessary. Excessive metal single-core high-voltage...

This paper presents a downhole increase in the pumping process used rack device processing technology and methods. Discussed assurance measures control of machining accuracy approach.

Focused on the image data storage, compression and transmission of mars rover, system design key hardware/software architecture are carried out in this paper based analysis function requirements features. Image algorithm protocol proposed, storage module Mars rover is designed implemented. The multi-camera partition parallel file FPGA（Field Programmable Gate Array）is realized. adaptive first 1 run length coding for DSP realized module. Finally management, flexible control ratio, quality...

A flume experiment is carried out to explore regular waves shoaling and breaking in surf zone. The topography two-slope model, which composed of a steep slope 1:5 gentle 1:40. incidence have heights 0.05, 0.06, 0.07, 0.08, 0.09 0.10 m, periods 1.0 sec. In order describe the wave propagation zone, height collected by gauges recorded high-speed camera. results show that, when increased, increases, while location point moves forward. When larger enough, trend slow down. Besides, secondary...

Wave breaking is the most complex and intensified physical process in coastal zone. And as maximum this area, wave height has a major impact on ocean engineering ship sailing. In paper, present calculation methods for are concluded divided into two categories: one directly computing models using deep elements; other indirectly based surf model criterion of breaking.

Using HF-Doppler detector we have been observed ionosphere disturbance continuously for about 20 years. Firstly, We gave a theoretic explanation to normal frequency-shift records, then using two typical cases pointed out that in china there exist F2 layer infrasonic which due severe weather. Through analyzing their spectrums, found three remarkable peaks. And comparing with foreign researchers, indicated disturbances possess local features. Finally, concluded features of occurring our area.

Over the last decade, neural networks have found application for solving a wide range of areas from business, commerce, data mining and service systems. Hence, this paper constructs new model based extension theory network to forecast ship transportation. The is combination network. It uses an distance measure similarity between cluster center, seek out useless data, then use forecast. When presenting test example prediction transportation, results verifies effectiveness applicability novel...

This paper uses the information on Xijiang floating production storage and offloading mooring system coupled with dynamic analysis of to generate scenarios for most likely causes damage wires if this is result in further progressive system. The modeling reflects fundamentals FPSO can be used investigate potential leg damage. has been indicative behavior lines under various conditions when BTM connected. model tensions, bending moments radiuses close lower socket. However models have checked...

In order to design a double buoys mooring system in the estuary of Yalu River for loading work 40,000 tons bulk cargo ship, article mainly based on practicality meteorological condition this sea area and data vessel as well national criterion, do some calculations wind force, current wave force total with calculation result make designation buoy system, decide size buoy, length chain, depth Deadman. The construction according has good effect; method are proved useful.

In order to evaluate the ship traffic safety about large water area, system of maritime macroscopic was developed, which can give simulation result under setting conditions, using electronic chart display and information conform S57 S52. The model flow is proposed, play an important part in system. outcome be provided according assessment method safety, displayed on ECDIS. With clicking icons by mouse button, offered.

This paper compared air gap and tolerance voltages correction methods on high altitude area, based them we analyze method considering the special environmental conditions of Sichuan-Tibet railway. With test results short in different areas China, verified adaptability insulation at an 4000 to 4500m. As a result, formulated value external under 50Hz overvoltage lightning impulse 27.5kV traction power supply system 4000m