1.0 引言把有效载荷送入轨道用的航天飞机的出现,给飞行器和有效载荷的设计带来了一系列新的问题。其中之一是,在起飞时有效载荷受到高强度的声级。国家航宇局总部根据某些研究工作(如参考文献[1]所做的)认识到:有效载荷周围的声级可能高于有效载荷设计使用的声级,这时便开始实行一项计划,其目的是取得可靠的声级估算值和设计噪声控制方法。 1.0 INTRODUCTION The advent of space shuttles that put payloads into orbit has created a series of new problems for the design of aircraft and payloads. One of them is that the payload is subject to a high level of sound at takeoff. Based on some research work (as done in reference [1]), NASA headquarters realized that the sound level around the payload might be higher than the sound level used by the payload design and a program was started, Its purpose is to obtain reliable sound level estimates and design noise control methods.