飞机的0站位为什么在机头前面130

奋斗亮 · 发表于 2016-3-30 10:32:06

请问飞机的0站位为什么在机头前面130

宵夜哥 · 发表于 2016-3-30 10:42:22

这个是设计时随便标的一般都在机头前边跟厂家有关

奋斗亮 · 发表于 2016-3-30 10:47:16

所有飞机都是这样吗

198848 · 发表于 2016-3-30 10:50:25

欧美的都是这样吧

影皇 · 发表于 2016-3-30 12:12:48

基准面在机头前面，这样得出的机身站位都是正值，不容易出错，做称重报告时也好计算。基准面也可以在机身和机后，那样的话，机身站位有正有负，很是麻烦。m6书有详细的说明，你看看书

501788984 · 发表于 2016-3-30 12:51:04

楼上说的基本差不多。我这里有份资料，里面专门说了为啥现在飞机的Body Station 基准站位在机头（Nose tip of A/C）前面老远的地方。这篇资料是Boeing Witchita分部飞机应力组的一个工程师写的，我觉得可信度挺高。此外，他还解释了为啥比如波音737系列飞机有500A，500B, 500C这样的站位的问题。
你的问题大概总结下就是很久以前飞机Body Station 0确实是在机头的地方。后来这些飞机要发生改变，可能是增长或者加装什么东西（原文说的是‘when the first 'stretch' or derivative was designed）那么有可能会用到负数的站位，飞机的设计工程师觉得非常麻烦，决定以后设计的新飞机的基准站位都放在飞机机头前面老远的地方，在飞机定位体系里留出足够的空间使这种飞机之后的设计改变中不回导致负数站位出现。

Re: A/C Body Station Designations
Date: 03 Nov 97 02:18:53
From: "Richard L. Grubb" <rlg0301@rs195261.ks.boeing.com>
Organization: 3-7DSL
References: 1
View raw article
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JAK1959 wrote:
>
> Could someone please inform me as to where the reference point
> is that body stations are measured from on commercial aircraft?
> Is it the forward pressure bulkhead? Is it the mounting
> structure for the weather radar? Please let me know.
>
> Also, are there any publications that have aircraft diagrams
> that would include both body stations and stringers?
>
> And a final question. How does Airbus designate the body
> stations? Please let me know.
I have been told by a coworker who had this same discussion at another aerospace company, that once, a long long time ago (in a place far far away), Body Station 0.0 was placed at the tip of the nose and waterline 0 may have been placed at the point of contact between the main gear and ground. But when the first 'stretch' or derivative was designed, 'they' vowed never to do that again.
Today (i.e. in my experience over the last 23 years), the origin is placed far enough in front of and below the airplane so as to never require the use of negative values for any reasonable stretched derivative. Of course, Butt Line 0 is placed on the centerline of symmetry. I have also been told that McD planes had waterline 100 placed at a prominent 'horizontal' feature and some other vertical feature such as a bulkhead would be given an arbitrary value such as BS 112.0.
In this explanation, I have been using nomenclature for Boeing fuselages. Other components such as wings and tails or even control surfaces have their own reference systems. I believe Wing Stations are perpendicular to the rear spar.
All of these coordinate systems are tied together on an airplane centerline drawing. All drawings are company proprietary data, but you may be able to write to the public relations department and request the information for particular models.
On a side note, the loads engineers require that an 'all numeric' coordinate system be used in their calculations. Why would a coordinate system never be 'all numeric' you might ask? Well remember those derivative models with stretched fuselages? The fuselages are generally stretched by adding body plugs just in front of the wing and/or just behind the wing. For instance, on the 737 family of airplanes, forward plugs are placed between BS 500 and BS 520. The designers do not want to relabel all of the frame drawings aft of the plug, so the first frame aft of BS 500 is given the 'coordinate' 500A, and so on to BS 500I for the 737-800. This system is impractical to use in engineering numerical analysis. The loads group therefore define a coordinate system (referred to by the terms balance arm or panel station) that has the same numerical value for various derivative models at some point in the center section of the body. A point near the tip of the 737-800 nose then is at BS 130.0 or balance arm -68.0
--
Richard Grubb
BCAG, 737NG Stress, Wichita
rlg0301@sgmail.ks.boeing.com
#include "std_disclaimers.h"

温馨的祝福 · 发表于 2016-3-30 13:07:16

厂家规定的，基准面前为负后为正

249355862 · 发表于 2016-3-30 13:34:45

就是一种设计或叫法

501788984 · 发表于 2016-3-30 14:00:24

见附图的解释

lws713 · 发表于 2016-3-30 18:12:46

为以后飞机的改进，留出空间，不至于使占位值出现负数

HelloSky · 发表于 2016-3-30 19:37:54

501788984 发表于 2016-3-30 14:00
见附图的解释

非常难得的资料！点个赞！

lzzzqw · 发表于 2016-3-30 21:34:04

飞机站位是以飞机最前端为基准以飞机上点到基准面的距离为标号例如前设备标号为178

761534978 · 发表于 2016-3-31 11:44:49

这是厂家的设计，没有为什么。

453379738 · 发表于 2016-4-1 15:21:33

都是这样，如果0开始会有问题。假如换不同型号雷达罩若无预留130可能会造成机头部分负站位

红茶飞 · 发表于 2016-4-2 19:25:16

这主要是跟厂家生产线有关呢，生产飞机的时候波音737的机头前方有放设备在前边，所以基准线不是0，这样他们便于计算飞机尺寸，这个空客算法不同

123sjl · 发表于 2016-4-6 13:20:57

保证正值，便于计算

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