从模拟原理和实质上讨论LOCKON等飞行模拟软件与研究所开发的空动实验模拟器的区别

wonderzhe

好文章，顶起来：0（7）：

firefox_st

不是很认同楼主观点，但是：


此贴为深水炸弹，鉴定完毕！！：0： ：0（1）：

IVAN_G

好贴，相比之下，
F4中关于F16的数据更加详尽

Mutha

这是Lock On的气动算法~来自ED
Aerodynamics


Realistic flight dynamics are a characteristic of the Flanker line of simulators. Lock On naturally continues this tradition.

In the dynamic model, non-simplified motion equations are used. Such equations do not overlook inertial characteristics of the plane.
In the model of the engine, real thrust - fuel consumption dependence on flight speed and altitude is considered. This provides real flight characteristics (acceleration, rate of climb, ceiling, maximum and minimum speed, flight range and time).
Non-linear corrections at high angles of attack are taken into account. This enables the ability to model flight at supercritical angles of attack and also stall modes and spins.
For more complicated modes, animation elements are used, for example, for the so called aerobatic "cobra" for Su-27, Su-33 and Mig-29.

General equations

Center of mass motion in wind axes is described by the following equations used at flight characteristics calculation (disregarding sliding)






where

H - is flight altitude;
V - is aircraft speed;
dV/dt - is acceleration;
θ - is flight path angle;
ψ - is heading;
P - is engine thrust;
Qsec - is second fuel consumption;
G - is aircraft weight;
φ - is angle between thrust vector and axe x;
γ - is angle of roll;
q - is dynamic pressure;
Cx - is drag coefficient;
Cy - normal force coefficient.

Sliding is described by the following equation:

When moving on the ground friction force is added: Ffriction = kfr * G * (1 - Ny).
When calculating Mach number and dynamic pressure the table of standard atmosphere is used.
At present in FM the following dependences are accepted for aerodynamics and engine characteristics:
Cy = Cyalfa(M) * α + Cyflaps * k(q) + nonlinear correction(α); Cy ≤ Cymax(M);
Cz = Czbeta(M)* β ;
Cx = Cx0(M) + Cxflaps + Cxpld(M) + Bpol(M) * Cy ** 2 + Dpol(M) * Cy ** 4 - Czbeta * β ** 2;
P(M,H,Dr) = F1(M)*F2(H)*F3(Dr);
Qsec = Ce * P / 3600

where:
M - is Mach number;
α - is angle of attack;
β - is slide angle;
Dr - is engine operating mode.


Dependences Cyalfa(M), Cymax(M), Czbeta(M), Cx0(M), Cxpld(M), Bpol(M), Dpol(M), F1(M), F2(H), F3(Dr) are set by the tables with linear interpolation.

To get real aerodynamics characteristics of aircraft and engine flight characteristics is rather difficult due to secrecy of such information. When there is not enough information on aerodynamics characteristics and engine flight characteristics we have to correct various table dependences to agree then with known flight characteristics (accelerations, turns, climb, flight range, etc).

[ 本帖最后由 Turkey 于 2007-5-26 20:09 编辑 ]

Mutha

看起来Lock On还是通过代入运算得到结果~
但是是基于确定的飞机数据。

有一个例外是X-Plane，它的运算结果完全取决于飞机的3D模型，因此曾经有老外用X-Plane中的Air Plane Maker建模自制的超轻型飞机并模拟试飞。
后来成功驾驶飞机上天。

wonjack

：0（13）： 说句实话  那些体验真实飞行的微软模拟飞行的玩家也是经过培训后才上的塞纳斯的.....

我空军一哥们说  模拟机飞的再好   上了天你就傻X了  ：0（13）：

GeMarK

haha~~

突然让我想起了流体力学在研究工程和CG表现的应用~

研究级要的是精确的数据！

而游戏要的是视觉和触觉上的感受~ 就像圆周率~ 研究级的可能要很多位小数的精确，我们日常生活2位小数即可~

没有可比性~ 楼主只是阐述了两者的不同而已~

作为菜鸟的我，学到了些东西，至少那天我要查询关于空气动力学和飞行力学的资料时，可以更有方向性的找算法了...

：0（7）：

GeMarK

原帖由 wufan 于 2007-5-26 23:18 发表

没觉得人家在扯，几乎时时都能听到许多人提到LOCK ON 的气动的模拟极好，极为真实，等等言论。
我不懂空气动力学，也不懂飞行模拟，但我知道，LOCK ON不可能像某些网友说的那样认为LOCK ON几乎跟真的一样。
...

呵呵~ 相对而已~ 相对而已~ 比起其他的一些模拟飞行的气动来说要相对真实些...：0（11）：

RoyalFlanker

感觉lo还是要像F4一样专心做一种飞机为好 这样真实性才有相当的保证。

Einstein

原帖由 米奇 于 2007-5-22 18:04 发表
差不多可以这么说了..

LO的确使用的就是数据..但是多年来不断的改进和接触军机,LO的气动模拟可以说是飞行模拟界比较优秀的了.

以前看过LO中的F15C和真实中F15C的飞行数据线.气动数据基本符合.

你开过没翅膀的F-15，应该知道这些数据的局限性了吧

aceforever

[quote]原帖由 Turkey 于 2007-5-26 20:01 发表
这是Lock On的气动算法~来自ED
Aerodynamics

这些是计算总体性能的积分式，应该只是阐述原理或者计算宏观性能用的吧。
在软件里的真实我想还是根据事先算好建立的数据库，因此具有很大的局限性，不过已经做得很不错了