http://www.dsti.net/Information/News/74784
西科斯基向海軍提交新的CH-53K專案計畫
2012-03-30
[據英國《飛行國際》網站2012年3月26日報導]CH-53K專案經理稱,美國海上航空系統指揮部(NAVIAR)正在評估西科斯基公司最新提交的關於4架量產型CH-53K製造的計畫。
NAVAIR在3月底收到了西科斯基公司提交的計畫書,評估完成後可能會授出採購合同,但沒有確定具體時間。
這4架機將採用與生產型完全相同的構型,用於使用評估及研製試驗。
根據目前的計畫,CH-53K將於2019年投入使用,比之前的計畫晚了一年,海軍陸戰隊希望能採購200架該機。專案啟動時,軍方計畫的採購數量僅為156架,預定于2015年形成初始作戰能力,但海軍陸戰隊將項目推後了3年,於2007年啟動,並將採購數量提高到227架。
在CK-53K服役前,海軍陸戰隊將繼續使用其現有CH-53E直升機,但計畫於2012年底退役掉現有的所有CH-53D。
近期CK-53K專案進展十分順利,一位海軍陸戰隊高層官員稱該專案為一個“很好的新聞故事”。
儘管該機採用了CH-53這一系列的編號,但實際上可以看做是一個全新設計的型號,並引入了一系列全新的技術。該機採用了電傳飛控系統、全新的發動機、複合材料槳葉和全新的駕駛艙,其主減速器則被稱為是一件“藝術品”,全部的設計工作都是在CATIA-5電腦輔助設計軟體環境下完成的。海軍陸戰隊認為,若項目的後續進展仍然順利,在2014年就能完成CH-53K的首飛。
但是,地面試驗機上的集成系統測試必須在收費前完成,目前用於地面試驗的原型機還沒有製造完成,預計試驗將於2013年開始進行。
地面試驗機上將裝備絕大部分的子系統,包括駕駛艙、液壓系統、旋翼頭和複合材料槳葉。
目前很多子系統已開始試驗,為在地面試驗機上的安裝做準備。其7500shp(5600千萬)的GE38-1B發動機已完成了超過1100小時的試驗。
西科斯基公司還建造了一個靜態的試驗機身,用於測試機身的結構載荷分佈。
西科斯基公司目前正在建造2架飛行測試機,用於解決研製過程中的問題。
當飛行試驗驗證了該機的適航性後,海軍陸戰隊將在4架預生產型機上開始使用試驗,並承擔一部分研製試驗。
軍方要求CH-53K能夠在1830米壓力高度、35℃環境下具備12300千克的有效載荷,並能夠在該載荷下具備204千米以上的航程。此外,還需進行評估,以證明CH-53K能夠完全融入陸戰隊的作戰體系中。只有這些試驗全部完成後,陸戰隊才有可能批准CH-53K的低速預生產。(中國航空工業發展研究中心 李昊)
http://www.flightglobal.com/news/articles/sikorsky-tables-new-ch-53k-proposal-369923/
Sikorsky tables new CH-53K proposal
PrintBy: Dave Majumdar Washington DC 11:00 26 Mar 2012 Source:
The US Naval Air Systems Command (NAVAIR) is evaluating a proposal from Sikorsky to build four production-representative CH-53K Super Stallion heavy-lift helicopters, says the US Marine Corps' programme manager.
"We're looking at the proposal now," says Col Robert Pridgen.
NAVAIR received the proposal at the beginning of March, he says. A contract award is expected some time after this has been evaluated, although Pridgen says: "I don't want to nail down a date."
The four pre-production aircraft will be "fleet-representative" and be used for operational evaluations, as well to finish developmental testing.
The CH-53K is now scheduled to become operational in 2019 - one year later than previously slated - and the Marines hope to buy about 200 of the three-engined type.
When the programme first started, the service only wanted to buy 156 aircraft, Pridgen says. Initial operational capability was then set for late 2015, but the USMC upped the order and stretched the programme out by three years in August 2007. Production numbers were to have reached as many as 227, before they were trimmed back to 200.
The USMC will continue to operate the legacy three-engined CH-53E until the new "Kilo" model replaces it, but plans to retire its remaining twin-engined CH-53Ds at the end of 2012.
Development of the CH-53K is moving ahead smoothly, Pridgen says. One senior Marine official singled out the programme as a "good news story".
Despite the CH-53 designation, the K-model helicopter is a clean-sheet design incorporating all-new technology, Pridgen says. It has a fly-by-wire control system and new engines, as well as a split-torque transmission described by Pridgen as a "work of art", composite rotor-blades and a new cabin, all designed using CATIA-5 computer-aided design software.
If all continues to go smoothly, "we'll go flying [in] 2014", Pridgen says.
However, that first flight will be preceded by the start of integration testing on a ground test vehicle that is currently under construction at Sikorsky's facilities in West Palm Beach, Florida.
"That's going to occur in 2013," Pridgen says.
The ground test vehicle will have most of the subsystems of a flyable aircraft, including the cockpit, hydraulics, rotor-head and composite blades.
"It will truly be integration for us to understand what the aircraft looks like dynamically," Pridgen says.
A number of subsystems are already being tested in preparation for installation in the ground test airframe. The CH-53K's 7,500shp (5,600kW) General Electric GE38-1B turboshaft engine design has already accumulated over 1,100h in test and Pridgen says: "We've been testing components for some time now."
Sikorsky has also built a static test airframe, which is being used to determine how the helicopter handles the structural loads that will be imposed on it in flight. That testing is underway at the company's facility in Connecticut.
Only after the new helicopter satisfactorily completes those tests will the aircraft be cleared for flight, Pridgen says.
Two flight test vehicles that will be used for developmental purposes are currently in production in West Palm Beach.
Once basic flight tests prove that the helicopter is airworthy, the Marines intend to start operational testing on the four pre-production aircraft, in conjunction with finishing developmental tests.
"With that data I will do something called operational test 1B," Pridgen says. "And that's where we bring Marines in."
The USMC's VMX-22 operational test squadron will verify the service's requirement to lift 12,300kg (27,000lb) at a 6,000ft (1,830m) pressure altitude on a 35˚C (95˚F) day, roughly three times the lift capacity of the CH-53E. The helicopter is also required to carry that load over a distance of 110nm (204km).
The unit will also make sure the aircraft is suitable for fleet use and integrate it into the USMC's order of battle. Only after these tests have taken place will the Marines approve low-rate initial production, which Pridgen expects to occur in 2015.