JP2961782B2 - Low sound pressure level rocket fairing - Google Patents
Low sound pressure level rocket fairingInfo
- Publication number
- JP2961782B2 JP2961782B2 JP1337470A JP33747089A JP2961782B2 JP 2961782 B2 JP2961782 B2 JP 2961782B2 JP 1337470 A JP1337470 A JP 1337470A JP 33747089 A JP33747089 A JP 33747089A JP 2961782 B2 JP2961782 B2 JP 2961782B2
- Authority
- JP
- Japan
- Prior art keywords
- fairing
- sound pressure
- pressure level
- low sound
- rocket fairing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/002—Launch systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/228—Damping of high-frequency vibration effects on spacecraft elements, e.g. by using acoustic vibration dampers
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は低音圧レベルロケットフェアリングに関し、
特にロケット打上時の機械環境条件の低減の一つとして
ロケットフェアリングに生じる音圧レベルを低減する低
音圧レベルロケットフェアリングに関する。なお、ロケ
ットフェアリングとはロケットの流線型の先端構造をい
う。The present invention relates to a low sound pressure level rocket fairing,
In particular, the present invention relates to a low sound pressure level rocket fairing for reducing the sound pressure level generated in a rocket fairing as one of the reductions in mechanical environment conditions at the time of launching a rocket. The rocket fairing refers to a streamlined tip structure of a rocket.
従来、ロケットフェアリング内の音圧レベルの低減技
術としては、フェアリングの内面に吸音材をはりつける
方法、あるいは、フェアリングに制振材を付加してフェ
アリングの振動をおさえることにより、音圧レベルの発
生を低減する方法がある。Conventionally, techniques for reducing the sound pressure level within a rocket fairing include attaching a sound absorbing material to the inner surface of the fairing, or adding vibration damping material to the fairing to reduce the vibration of the fairing. There are ways to reduce the occurrence of levels.
上述した従来の低音圧レベルロケットフェアリングは
ある程度音圧レベルを低減しているが、フェアリング内
のペイロードの設計に対して、クリティカルな影響があ
る欠点があり、さらに軽量で効果のある大きな音圧レベ
ルの低減材料が望まれている。Although the above-mentioned conventional low sound pressure level rocket fairing reduces the sound pressure level to some extent, it has a drawback that has a critical effect on the design of the payload in the fairing, and also has a lighter and more effective loud sound. Materials that reduce pressure levels are desired.
本発明の低音圧レベルロケットフェアリングはペイロ
ードを搭載し隔壁で密閉されたロケットフェアリング内
に空気より分子量の小さい不活性気体を充てんしてい
る。The low sound pressure level rocket fairing of the present invention is loaded with an inert gas having a molecular weight smaller than that of air in a rocket fairing mounted with a payload and sealed with a partition wall.
次に本発明について、図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の断面図である。ペイロー
ド１はフェアリング２、隔壁３に囲まれた空間内に搭載
される。また、この空間には空気より分子量より小さい
（密度の小さい）不活性ガス４が充てんされる。フェア
リング２内の音圧はロケットの打上げ中の遷音速時に発
生する衝撃波によってフェアリング２が励振され、その
振動がフェアリング２内側の気体を励振することにより
生じる。一般にフェアリング空間内の音圧レベルとフェ
アリングの振動、フェアリング空間内の気体の密度には
次式に示すような関係がある。今、P:音圧（音響荷
重）、A:フェアリングの面に垂直な方向の振幅、ω：フ
ェアリング振動数、ρ：フェアリング空間内の気体の密
度とすると、 Ｐ∝Ａω２ρ すなわち、空気よりも密度の小さいヘリウムガス等
を、フェアリング内に充てんしておくことにより、両者
の密度比分だけ音圧レベルを低減させることができる。
例えば空気とヘリウムガスの密度比が約1/7であるの
で、音圧レベルは約1/7（約−17dB）に低減させること
ができる。FIG. 1 is a sectional view of one embodiment of the present invention. The payload 1 is mounted in a space surrounded by the fairing 2 and the partition 3. In addition, this space is filled with an inert gas 4 having a smaller molecular weight (smaller density) than air. The sound pressure in the fairing 2 is generated by exciting the fairing 2 by a shock wave generated at the transonic speed during launch of the rocket, and exciting the gas inside the fairing 2. In general, the sound pressure level in the fairing space, the vibration of the fairing, and the density of the gas in the fairing space have the following relationship. Now, if P: sound pressure (acoustic load), A: amplitude in the direction perpendicular to the plane of the fairing, ω: fairing frequency, ρ: density of gas in the fairing space, P∝Aω 2 ρ By filling the fairing with helium gas or the like having a lower density than air, the sound pressure level can be reduced by the density ratio between the two.
For example, since the density ratio between air and helium gas is about 1/7, the sound pressure level can be reduced to about 1/7 (about -17 dB).
以上説明したように本発明は、従来、空気が充てんさ
れていたフェアリング内にヘリウム等の分子量の小さい
不活性ガスを充てんすることにより、フェアリング内の
音圧レベルを低減できる効果がある。As described above, the present invention has the effect of reducing the sound pressure level in the fairing by filling the fairing, which has been conventionally filled with air, with an inert gas having a low molecular weight such as helium.
第１図は本発明の一実施例の低音圧レベルロケットフェ
アリングの縦断面図である。 １……ペイロード、２……フェアリング、３……隔壁、
４……不活性ガス。FIG. 1 is a longitudinal sectional view of a low sound pressure level rocket fairing according to an embodiment of the present invention. 1 ... payload, 2 ... fairing, 3 ... partition wall,
4 ... Inert gas.
Claims (1)
ットフェアリング内に空気より分子量の小さい不活性気
体を充てんしたことを特徴とする低音圧レベルロケット
フェアリング。A low sound pressure level rocket fairing characterized in that an inert gas having a smaller molecular weight than air is filled in a rocket fairing mounted with a payload and sealed by a partition wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1337470A JP2961782B2 (en) | 1989-12-25 | 1989-12-25 | Low sound pressure level rocket fairing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1337470A JP2961782B2 (en) | 1989-12-25 | 1989-12-25 | Low sound pressure level rocket fairing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03193597A JPH03193597A (en) | 1991-08-23 |
| JP2961782B2 true JP2961782B2 (en) | 1999-10-12 |
Family
ID=18308946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1337470A Expired - Lifetime JP2961782B2 (en) | 1989-12-25 | 1989-12-25 | Low sound pressure level rocket fairing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2961782B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8915472B2 (en) * | 2012-05-11 | 2014-12-23 | The Boeing Company | Multiple space vehicle launch system |
| US9180984B2 (en) | 2012-05-11 | 2015-11-10 | The Boeing Company | Methods and apparatus for performing propulsion operations using electric propulsion systems |
-
1989
- 1989-12-25 JP JP1337470A patent/JP2961782B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03193597A (en) | 1991-08-23 |
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