Non-Standard Day 210C
Implement MIL-STD-210C climatic data
- Library:
航空空间/ Environment / Atmosphere
Description
TheNon-Standard Day 210Cblock implements a portion of the climatic data of the MIL-STD-210C worldwide air environment to 80 km (geometric or approximately 262,467 feet geometric) for absolute temperature, pressure, density, and speed of sound for the input geopotential altitude.
TheCOESA Atmosphere Model,Non-Standard Day 210C, 和Non-Standard Day 310块是相同的块。配置时COESA Atmosphere Model, the block implements the COESA mathematical representation. When configured forNon-Standard Day 210C, the block implements MIL-STD-210C climatic data. When configured forNon-Standard Day 310, the block implements MIL-HDBK-310 climatic data.
TheCOESA Atmosphere Modelblock port labels change based on the input and output units selected from the单位列表。
限制
All values are held below the geometric altitude of 0 m (0 feet) and above the geometric altitude of 80,000 meters (approximately 262,467 feet). The envelope atmospheric model has a few exceptions where values are held below the geometric altitude of 1 kilometer (approximately 3,281 feet) and above the geometric altitude of 30,000 meters (approximately 98,425 feet). These exceptions arise from lack of data in MIL-STD-210C for these conditions.
通常,温度值是线性插值的,密度值是对数插值的。使用完美的气体定律计算声音的压力和速度。信封大气模型有一些例外,其中极值是作为输出提供的唯一值。在这些情况下,压力是插值的。这些包膜大气模型例外适用于所有高压和低压,高温和低温以及高密度和低密度的情况,不包括极端值和1%的发生频率。这些例外是由于在MIL-STD-210C中缺乏这些条件的数据。
另一个限制是,在MIL-STD-210C中,不包括60°S纬度以南地区的气候数据。
该块使用MIL-STD-210C规格中的数据的度量版本。信封内的某些数据对于低密度,低温,高温,低压和高压之间的度量和英语版本之间不一致。最重要的差异发生在以下值中:
对于频率为5%的低密度包络数据,公制单位的密度值在4 km和18 km处不一致,英语单位的密度值在14 km处不一致。
对于具有10%频率的低密度包膜数据,
The density values in metric units are inconsistent at 18 km.
The density values in English units are inconsistent at 14 km.
对于具有20%频率的低密度包络数据,英语单位的密度值在14 km处不一致。
对于20%频率的低温包络数据,20 km时的温度值不一致。
对于具有10%频率的高压包膜数据,在8 km处的度量单位的压力值不一致。
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参考
[1]Global Climatic Data for Developing Military Products.华盛顿特区MIL-STD-210C:国防部,1987年。