Chinese Military Articles: Translation Thread

Discussion in 'Members' Club Room' started by siegecrossbow, Aug 3, 2011.

  1. siegecrossbow
    Online

    siegecrossbow Brigadier
    Staff Member Super Moderator

    Joined:
    Mar 22, 2010
    Messages:
    6,090
    Likes Received:
    8,538
    Re: Translation of amateur Chinese military article, take a look!

    Haha you are right. That is something else I need to fix.
     
  2. latenlazy
    Offline

    latenlazy Colonel

    Joined:
    Jun 24, 2008
    Messages:
    4,271
    Likes Received:
    3,452
    Re: Translation of amateur Chinese military article, take a look!

    You translated dihedral as anhedral didn't you :p
     
  3. delft
    Offline

    delft Brigadier

    Joined:
    Nov 15, 2009
    Messages:
    7,230
    Likes Received:
    6,750
    Re: Translation of amateur Chinese military article, take a look!

    Indeed Siege, there are some rough edge in the translation but it can be well understood. You can already see J-20 taking shape except that it came out even better due to the engine intakes moving to the sides. It is a fascinating read.
     
  4. siegecrossbow
    Online

    siegecrossbow Brigadier
    Staff Member Super Moderator

    Joined:
    Mar 22, 2010
    Messages:
    6,090
    Likes Received:
    8,538
    Re: Translation of amateur Chinese military article, take a look!

    I think I've fixed most of the grammatical and logical bugs in the translation, thnx to Scratch's help. If you feel like quoting Dr. Song's translation any where feel free to link my translation.

    ***NEW EDITS***

    Rephrasing contradictions to conflicts. Kudos to Gambit for the edit.

    Changed trans-sonic to transonic.

    Changed "wing bending mechanism" to wing twist device based on advice from farocean3000 from CJDBY

    Added title.

    Changed "small aspect ratio" to "low aspect ratio".

     
    #84 siegecrossbow, Mar 12, 2012
    Last edited: Mar 16, 2012
  5. delft
    Offline

    delft Brigadier

    Joined:
    Nov 15, 2009
    Messages:
    7,230
    Likes Received:
    6,750
    Re: Translation of amateur Chinese military article, take a look!

    I recently reread the translation and have to make a few remarks.
    First: aerodynamicists use as a measure of average wing chord length wing something they call the mean aerodynamic chord, which is calculated from the outline of the wing plan form. They might say instability is 10% of the mean aerodynamic chord or, being lazy, 10% of MAC.
    Second: MAC is calculated using a standard way, but you can choose how much of the fuselage you add to the wing: do you continue the wing leading edge to the aircraft center line or do you add only what is between the actual wing root chords. It doesn't matter what you do, as long as you are consistent. A sufficiently accurate MAC can be calculated from the estimated dimensions of J-20.
    Third: the aerodynamic center is the point through which the increase in the lift vector goes when the angle of attack is increased ( slightly, that aerodynamic center might move a lot for an awkwardly designed aircraft ). With the center of gravity aft of the aerodynamic center the aircraft is stable in pitch: if the angle of attack is increased the lift increase will help restore the old situation.
    The aerodynamic center of a wing is near or slightly abaft the point at 25% of the MAC. For the whole aircraft it is generally further aft.
    Fourth: In J-20 we know where the center of gravity is from the position of the undercarriage members: about 15% of the distance between nose and main wheels in front of the main wheels. An instability of 10% MAC would put the aerodynamic center that distance in front of the center of gravity, pretty far in front of the wing and a powerful illustration of the contribution of the fuselage to the lift. This also shows the need for the canard deflections we have seen.

    I thank the translators for the great job they have done.
     
  6. Air Force Brat
    Offline

    Air Force Brat Brigadier

    Joined:
    Dec 7, 2011
    Messages:
    8,700
    Likes Received:
    10,164
    Re: Translation of amateur Chinese military article, take a look!

    I concur on all counts, nicely stated sir! and indeed I love the paper, but without the hard work of all of you, I wouldn't know. Thank you.
     
  7. ZELEGEND
    Offline

    ZELEGEND New Member
    Registered Member

    Joined:
    Mar 24, 2012
    Messages:
    12
    Likes Received:
    0
    Really interesting stuff here! Thanks for the translations!
     
  8. Engineer
    Offline

    Engineer Major

    Joined:
    Oct 25, 2008
    Messages:
    3,202
    Likes Received:
    1,397
    Re: Translation of amateur Chinese military article, take a look!

    What is the status of translation for part 2? Is the entire thing done already or does it still need more work?


     
  9. siegecrossbow
    Online

    siegecrossbow Brigadier
    Staff Member Super Moderator

    Joined:
    Mar 22, 2010
    Messages:
    6,090
    Likes Received:
    8,538
    This article is an old effort of mine (dating back to March 2012) on the father of China's laser weapon system, Professor Yijun Zhao. My apologies for taking a year to finish the translation.

    This is one of my harder translations due to the proliferation of technical terms. However there are a lot of interesting information that we can gather from this article. Professor Zhao studied laser ablation of metallic surfaces before he began laser weapon research. We can assume that the weapon he is developing is no ordinary blinder (like the one mounted on Type-99 MBT) but capable of physical damage. He performed preliminary tests very early (1993) and I am inclined to believe that the device has strategic ramifications since all the nations that performed related experiments are members of the UN security council. I believe that the laser in question is designed primarily for missile interception but also could serve the secondary function of anti-satellite warfare.

    Professor Yijun Zhao

    Original Article:

    赵伊君,国防科技大学教授, 应用物理和强光光学专家。l953年毕业于北京大学物理系,历任哈尔滨军事工程学院海军工程系助教、原子工程系讲师,长沙工学院教研室主任,国防科技大学应用物理系副教授、教授、光子对抗研究中心主任、博士生导师。
    1997年当选为中国工程院院士。
    赵伊君教授长期从事原子结构、气体物理力学、核爆炸光辐射和高能激光武器的科研和教学。作为第一完成人获国家科技进步一、二等奖各l项,部委级科技进步一、二等奖各4项。
    六十年代,赵伊君教授参加核试验,基于强爆炸时氧、氨分子反应动力学,定量描述了最小照度现象,建立了由光辐射速报核爆当量方法,荣立二等功;为核试验研制出3种光辐射测试设备,获湖南科学大会奖。
    七十年代,赵伊君教授提出核爆炸多层球模型,其中辐射流体力学方程中状态方程和不透明度由原子结构和高温气体物理力学求出。总结此工作,出版《角动量与原子能量》、《原子结构的计算》、《原子的X—alpha波函数》3部专著,起到了在我国推广原子自洽场计算的作用。
    禁止大气层核试验后,赵伊君教授基于核爆光辐射与强激光同属强光光学,转而探索激光武器破坏机理。用原子分子物理和物理力学方法,提出激光在非完全电离等离子体中的输运及在固体表面沉积算法,建立了脉冲激光使金属壳体层裂、连续激光引起材料软化等模型,得出破坏不同目标所需激光系统的主要参数。
    1976—1983年期间,先后在中国科学院、中国力学学会、中国物理学会召开的全国性学术会议上发表了《高能激光辐照固体材料时热激波效应的计算》、《激光脉冲辐照金属材料时引起的层裂破坏》、《破坏效应研究中的原子分子物理问题》等报告,推动了该领域研究从宏观向微观层次的深入,1988年被863计划某主题聘为强激光破坏机理专题专家。
    1984年起,赵伊君教授被任命为我国武器某任务专家组组长,在总部领导下,他带领来自全国5大部个研究所、数百名科技人员科研团队,经二十多年努力论研究和工程技术方面均取进展。1993年研制出激光武器装置,进行了静态与准动态试验,使我国成为继美、苏、法后第4个进行过该试验的国家,1997年获国家科技进步二等奖(排名1)。
    1996年研制出激光武器进行了动态打靶试验,使我继美、俄后第3个进行过核试验的国家。2005年研制出激光武器样机,进行了演示验证试验,使我国成为继美国后第2个进行核验研的国家,2008年获国家利一等奖(排名l)。
    赵伊君教授建立了全系模型,提出激光器光束发散射望远镜主镜口径、跟踪架与大气湍流强度、相干长度优化准则;提出一种消除强光束定向器内光路中非线性法;证实用自适应光学补偿象差时,可不用信标而进行校正等。
    赵伊君教授像一匹不知疲倦的老马,在国防科技的这一片天地里驰骋,永远向前。

    My Translation:

    Professor Yijun Zhao of the National Defense Technology University is an expert in applied physics and optics. He graduated from the Beijing University's physics department in 1993 and served as a naval engineering teaching assistant at the Haerbin Military Engineering Academy following his graduation. During his career he served as an atomic engineering lecturer in Haerbin, research director at the Changsha Engineering University, and associate professor of the applied physics department at the National Defense Technology University. Upon assuming the role of a professor at NDT he became the director of the photonic defense research center and PhD advisor. In 1997, he was elected Academician at the Chinese Academy of Engineering.


    Professor Zhao specializes in scientific research and education in the fields of atomic structure, gas mechanics, nuclear radiation, and high energy laser weapons. He is the first person to be awarded both first and second place prizes in the national technological advancement awards as well as first and second place prizes in ministerial level technological advancement awards.

    During the 1960s, Professor Zhao participated in nuclear experiment. His study of oxygen-ammonia molecular reaction kinetics during strong nuclear explosions helped describe the minimum illumination phenomenon, which in turn established a new method to measure nuclear explosion yields using radiation speed and landed him his second place award. He also developed three new radiation detection equipment for nuclear experiments and won the Hunan Science Convention Award.

    During the 1970s, Professor Zhao proposed a multi-layer spherical model for nuclear explosions. In his studies he obtained radiation fluid dynamic equations using atomic structure and high temperature gas kinetics. After finishing his research, he published "Angular momentum and Nuclear Power", "Computation of Atomic Structures", and "The X-alpha wave coefficient of the Atom", which assisted nuclear containment field calculations in our country.

    After atmospheric nuclear tests were banned, professor Zhao switched to laser weapon damage research since radiation from nuclear explosions, like high energy lasers, are both categorized under high intensity optics. He used atomic level physics and physical mechanics to propose computation algorithms for laser based plasma channeling and deposition on solid surfaces. He later established models for cracking metallic surfaces using pulsed lasers and causing structural fatigues using continuous laser exposure in order to obtain the primary coefficients for damaging different targets using laser systems.

    Between 1976 and 1983, Professor Zhao published "Computation of thermal shock effect generated by laser radiation on solid material", "Spallation damage caused by pulsed laser radiation on metallic material","Atomic and molecular physics problems encountered during research on destructive effects", and several other papers at the national conferences organized by the Chinese Science Academy, the Chinese Mechanics Society, and the Chinese Physics Society. His work facilitated deeper research and understanding in his field of study. In 1988 he was appointed task manager of high powered laser damage research topic of project 863.

    Since 1984, Professor Zhao had been appointed panel leader of China's XXX weapons specialist panel. Under the guidance of higher leadership, he led a research team consisting of several hundred of the nation's top talents from five major national research centers and made tremendous progress in theoretical research as well as engineering techniques after 20 years of hard work. In 1993 he successfully produced a working laser weapon prototype and performed both static and semi-dynamic firing experiments. Following in the footsteps of the U.S., Great Britain, and France, China became the 4th nation to perform such experiments. In 1997 Professor Zhao won the second place prize of the National Technological Advancement Award (first rank).

    In 1996 he developed a laser weapon that participated in dynamic firing trials- a feat which enabled China to become the third nation with such capabilities after Russia and United States. In 2005 he developed the laser weapon prototype that participated in demonstration trials. As a result China became the second nation after the United States to perform such experiment. He won the first place prize of the National Technological Advancement Awards for his accomplishments (rank one).

    Professor Zhao established the systematic model for laser weaponry. He put forward the proper optimization criterion for the interactions between the caliber of the laser emitter's primary optics and tracking gimbal with the intensity and relative length of atmospheric disturbances. He suggested a solution for eliminating nonlinear propagation of intense beams within the directional optical path which, as the experiments proved, didn't require beacons for atmospheric effect corrections.

    Professor Zhao is like a tireless old stallion that charging forth in the realm of national defense technology.
     
  10. siegecrossbow
    Online

    siegecrossbow Brigadier
    Staff Member Super Moderator

    Joined:
    Mar 22, 2010
    Messages:
    6,090
    Likes Received:
    8,538
    Someone from Pakistan Defense linked my translation to the J-20 article from Wikipedia!

    I know that the link will probably get taken down since it is from a forum but... it still feels nice for someone to recognize your work.

    Chengdu J-20 - Wikipedia, the free encyclopedia
     
Loading...

Share This Page