نوید آبادانی Navidabadani.ir
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وبلا گ متعلق به شرکت نوید ابادانی استلایروب 2
Cutter Suction Dredger
A cutter suction dredger is a stationary or self-propelled vessel that uses a rotating cutter head to loosen the material in the bed (‘cutting’A suction inlet located beneath the cutter head (known as the suction mouth) is connected by a suction tube directly to one or more centrifugal pumps. The vacuum force at the suction inlet sucks up the loosened material. The suction tube and cutter head are attached to a ladder. The ladder with cutter head is positioned at the fore of the vesselOn the aft side, the cutter generally has two spud poles. One spud pole (the auxiliary spud) passes straight through the vessel, while the other is mounted on a movable spud carriage, which can be moved lengthwise along the vessel or pontoon. Steel cables are used to move the ladder or cutter head back and forth, with the spud in the spud carriage as the centre of each concentric circle that it describes. Moving the spud carriage causes the cutter suction dredger to move as well (‘stepping’). The cutter suction dredger discharges the dredged material dire
لایروب
suction hopper dredger
The dredging process can be subdivided into two main subprocesses: trailing (propulsion of the ship) and dredging (excavation of the soil from the sea bed and its transport to the ship). Set-points for manipulated variables influencing these processes are determined by two human operators. Consequently, the performance and efficiency of the entire dredging process heavily depend on the experience and insight of these operators
Changes of external variables that have large influence on dredging efficiency, such as the type of soil, dredging depth, water current, etc., require that the operators must constantly change the important settings of the manipulated variables. These include the propeller pitch, the pump drives, the visor angle, swell compensators, etc., when these actuators are controlled manually, or the corresponding set-points for trail speed, mixture speed, soil-water mixture density, etc., when controlled automatically
An important constraint is the limited amount of energy available on-board. Proper distribution of the energy among the different subprocesses is thus crucial. In addition, different operating strategies can be used in different dredging projects, such as the maximization of the production rate vs. optimization of efficiency and awareness of maintenance and fuel costs
The goal of this project is to develop an adaptive decision-support system that will advises the operators on the most suitable control strategy, given a specified goal, such as the minimization of the integral dredging costs per m3 or the maximization of the production per time unit. The system will make use of available knowledge in the form of (partial) mathematical models of the process and will also involve on-line learning and adaptation during operation
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PTFE
بیشترین مقاومت خوردگی در مقابل اسید هاPTFE
پُلی( پلی \تترافلوئورو اتیلن ماده‌ای ساخته شده توسط شرکت مواد شیمیایی دوپون کمترین ضریب اصطکاک را در بین کل مواد دارد معروف‌ترین سازنده تجاری این ماده دوپونت است که آن را با نام تجاری تفلون تولید می‌نماید.
ویژگی‌های فیزیکی این ماده
| ویژگی | واحد | مقدار |
|---|---|---|
| چگالی | g/cm³ | ۲٫۲ |
| نقطه ذوب | °C | ۳۲۷ |
| مدول یانگ | GPa | ۰٫۵ |
| مقاومت تسلیم | MPa | ۲۳ |
| ضریب اصطکاک | ۰٫۰۵-۰٫۱۰ | |
| ثابت دی الکتریک | ε=۲٫۱،tan(δ)<۵(-۴) | |
| ثابت دی الکتریک (۶۰ Hz) | ε=۲٫۱،tan(δ)<۲(-۴) | |
| مقاومت دی الکتریک (۱ MHz) | MV/m | ۶۰ |