工程硕士英语展示PPT.pptVIP

A conference on improvement of the naval ships’ speed Characters in the play (in order of appearance) FuLipeng: An official of the Defense Department; Wangjia: An expert in power system of ships; Luoxiao and Yangyu: Experts in type and structure of ships; LvYanwei: An expert in hull material. Cargo ship Vietnamese naval ship Chinese naval ship The factors influencing a ship’s speed The power is not large enough, The fuel efficiency is low. The main problems of the current warship power system: Steam, Diesel engine power, Gas turbine power drive, Diesel fuel oil machine hybrid drive. The common power systems of Chinese warships ： Start-up difficulties→The rapid response of the speed. Large quality→Increase the warship load. Low fuel efficiency→A waste of energy. The main problems of diesel engine: Ship structures Hull is not ideal streamline Water plane area is huge another existing problem: air resistance 1. superstructure(上层建筑) volume is too large 2. superstructure form is too complex Present hull material——steel Problem：heavy weight 、low strength、low toughness、easy corrosion、no stealth Before the service several years later Nuclear fuel instead of ordinary fuel Improvement suggestions Nuclear reactors produce fission reaction releasing enormous energy. Reason: Method: Improvement suggestions NO1. Big power Advantages: Attention: Treatment of nuclear waste NO2. Long life time Water resistance Friction resistance Wave resistance wet surface area shape under waterline Low speed High speed High speed ships Catamaran(双体船) Swath(小水线面双体船) Twin hull Twin hull