表面上是 聯合船舶設計發展中心 用 三維小板數值法(hsc3d)這套公式 協助設計出沱江艦的雙船體艦身構型,而且計算結果和水槽測試十分吻合
問題來了這套三維小板數值法(hsc3d)的數據資料庫哪裡來的
我覺得有兩種可能
1.外國給得
2.聯合船舶設計發展中心建造數艘穿浪雙船體的技術驗證船 用土法煉鋼的方式跑上數年蒐集相關數據資料
請問大家認為哪種能性比較高
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hn1271n wrote:
表面上是 聯合船舶設...(恕刪)
隱形戰機的物理原理的電磁波反射和繞射
只要有簡化的方程式就能由超級電腦計算出來哪種外形能夠隱形
只是最後的暗房測試比較困難
隱形戰機的簡化物理方程式是由俄羅斯人的科學家提出的
而1970年代被美國發明出來
彼得·烏菲莫切夫（俄語：Пётр Я́ковлевич Уфи́мцев，1931年－），蘇聯科學家，被認為是現代匿蹤飛機技術的創意推動者，在1960年代，他開始研究簡單二維物體的電磁波反射方程。
1964年，他在《莫斯科學院無線電工程學報》上發表了一篇頗有創意的論文「物理衍射理論中的邊緣波行為」。在這篇文章中，他提出，物體對雷達電磁波的反射強度和物體的尺寸大小無關，而和邊緣佈局有比例關係。烏菲莫切夫說明了如何計算飛機表面和邊緣的雷達反射面。從他的理論可以得出一個結論，即使一個很大的飛機，仍然可以被設計成能夠「匿蹤」的。
他的大部分研究成果被翻譯成英語，到了1970年代，美國科學家發展了一些烏菲莫切夫的理論，發明了飛機「匿蹤」的概念。
https://en.wikipedia.org/wiki/Petr_Ufimtsev
Pyotr Yakovlevich Ufimtsev (Russian: Пётр Я́ковлевич Уфи́мцев) (born 1931 in Altai Krai) is a Soviet/Russian physicist and mathematician, considered the seminal force behind modern stealth aircraft technology. In the 1960s he began developing equations for predicting the reflection of electromagnetic waves from simple two-dimensional shapes.[1]
Much of Ufimtsev's work was translated into English, and in the 1970s American Lockheed engineers began to expand upon some of his theories to create the concept of aircraft with reduced radar signatures.[2]
Contents
1 Biography
2 Developing the mathematics
3 Books
4 References
5 External links
Biography
Ufimtsev was born into a peasant family in the village of Ust-Charysh Pristan, in the Altai region, of the former USSR (N 52.40, E 83.66). At the age of 3 his father was repressed by the regime and later died in a forced labor camp (GULAG system). In 1949 Ufimtsev finished school and entered the physics-math department at Almaty State University (now in Kazakhstan). Because of progressing myopia (nearsightedness) he had to move from Almaty to a specialized clinic located in Odessa, Ukrainian SSR. Later in 1952 he continued his studies at the Odessa State University. After graduating from university in 1954 he was invited to attend the Institute of Radio-engineering and Electronics in Moscow, where he specialized in electronic warfare.
Developing the mathematics
Ufimtsev became interested in describing the reflection of lasers while working in Moscow. He gained permission to do work on it after being advised that work was useless and would curtail his advancement. Because the work was considered of no military or economic value, Ufimtsev was allowed to publish his work internationally.[3]
A stealth engineer at Lockheed, Denys Overholser, had read the publication and realized that Ufimtsev had created the mathematical theory and tools to do finite analysis of radar reflection.[4] This discovery inspired and had a big role in the design of the first true stealth aircraft, the Lockheed F-117. Northrop also used Ufimtsev's work to program super computers to predict the radar reflection of the B-2 bomber.
In the 1960s Ufimtsev began developing a high-frequency asymptotic theory for predicting the scattering of electromagnetic waves from two-dimensional and three-dimensional objects. Among such objects were the finite size bodies of revolution (disk, finite cylinder with flat bases, finite cone, finite paraboloid, spherical segment, finite thin wire). This theory is now well known as the Physical Theory of Diffraction (PTD).
The first results of PTD were collected in the book: P.Ya. Ufimtsev, Method of Edge Waves in the Physical Theory of Diffraction, Soviet Radio, Moscow, 1962. In 1971 this book was translated into English with the same title by U.S. Air Force, Foreign Technology Division (National Air Intelligence Center ), Wright-Patterson AFB, OH, 1971. Technical Report AD 733203, Defense Technical Information Center of USA, Cameron Station, Alexandria, VA, 22304-6145, USA.
According to the following publications, this theory played a critical role in the design of American stealth-aircraft F-117 and B-2.[5][6][7]
See also the Forewords written by K. Mitzner to the books:
Ufimtsev, P.Ya. Theory of Edge Diffraction in Electromagnetics, Tech Science Press, Encino, California, 2003.
Ufimtsev, P.Ya. Fundamentals of the Physical Theory of Diffraction, Wiley & Sons, Inc., Hoboken, New Jersey, 2007.
In these two books, P.Ya. Ufimtsev presented the further development and application of PTD and its validation by the exact mathematical theory. In particular, a new version of PTD, based on the concept of elementary edge waves, is presented in his book Fundamentals of the Physical Theory of Diffraction (2007). With appropriate modifications the modern PTD can be utilized for the solution to many practical problems. Among them are the design of microwave antennas, mobile radio communication, construction of acoustic barriers to decrease a noise level, evaluation of radar cross sections for large objects[8] (tanks, ships, missiles, etc.).
Dr. Ufimtsev has been affiliated with a number of research and academic institutions, including the Institute of Radio Engineering and Electronics of the USSR Academy of Sciences (Moscow), Moscow Aviation Institute, the University of California (Los Angeles, Irvine) and most recently, the Moscow State University (Russia, 2007) and the Siena University (Italy, 2008). Currently he is a retiree and a consultant in the field of electromagnetics. Among his honors and awards are the USSR State Prize and the Leroy Randle Grumman Medal.[9]
Ufimtsev taught at the University of California, Los Angeles (UCLA), which is the same school that Ben Rich, developer of the F-117 "Stealth Fighter", studied for his graduate degree.
Books
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cche1079 wrote:
中國的022雙體船就是由澳洲協助設計的, 整個022船體基本就是國外一手包辦.....
台灣這方面似乎沒有外國公司的公開技術支援,不過台灣研究雙體船大約是10年前就開始的, 好幾年之前有看過聯合設計中心的雙體模型在水槽模擬測試的照片,有部分測試數據據說來自台灣的大學造船系所.......
應該這樣說
最先是有外國建議作戰方式，在方式中再去找需要的東西，但傳統構型要能符合的噸位會較大，所以外國建議其他構型船體，能得到較大的上層面積擺東西，而且噸位比較小。但台灣本身沒有這方面的經驗及技術，所以外國又提供構型做參考或是台灣設計後請「外國看一下」，完成後，外國還提出一些建議供之後參考，就這樣。
外國什麼也沒賣，也沒技轉，台灣自己設計建造
我亂夢的~~
越是自卑就越戰狼，越是戰狼就更顯得自卑！
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文章編號：52436041
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文章編號：58340871
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文章編號：58341834
