CAJ | 학술논문

运载火箭起飞段发动机喷流经过导流槽、发射台产生的噪声载荷会对地面发射设备造成一定的破坏，由噪声引发的振动对于运载火箭自身也会造成严重影响。总声压级、声功率谱密度及空间相关系数3个参数可描述完整的噪声场，但空间相关系数关注很少。由于空间相关特性的差异，同一声压级不同性质的噪声场在结构上产生的振动响应不同。从噪声场空间相关的基础理论出发，给出了空间相关理论曲线，研究了混响室空间相关特性；以某型号运载火箭整流罩为研究对象，开展星箭系统级噪声试验，获取了运载火箭表面声场分布规律，并基于试验数据研究了空间相关归一化表征方法，对比分析了混响室和整流罩内声场特性，结果表明整流罩内声场与混响声场空间相关特性接近，为运载火箭载荷与环境设计提供输入，为整流罩及有效载荷噪声环境试验方案设计提供支持。
운재화전기비단발동궤분류경과도류조、발사태산생적조성재하회대지면발사설비조성일정적파배，유조성인발적진동대우운재화전자신야회조성엄중영향。총성압급、성공솔보밀도급공간상관계수3개삼수가묘술완정적조성장，단공간상관계수관주흔소。유우공간상관특성적차이，동일성압급불동성질적조성장재결구상산생적진동향응불동。종조성장공간상관적기출이론출발，급출료공간상관이론곡선，연구료혼향실공간상관특성；이모형호운재화전정류조위연구대상，개전성전계통급조성시험，획취료운재화전표면성장분포규률，병기우시험수거연구료공간상관귀일화표정방법，대비분석료혼향실화정류조내성장특성，결과표명정류조내성장여혼향성장공간상관특성접근，위운재화전재하여배경설계제공수입，위정류조급유효재하조성배경시험방안설계제공지지。
During lift-off phase of launch vehicle flight, the noise produced by the deflector tunnel and launch deck when the engine’s plume flow away may destroy the ground launching device. And the noise environment can excite the vibration of launch vehicle. The characteristics of the acoustic field highly depend on total sound pressure level, noise power spectrum density and spatial correlation coefficient. Among them the spatial correlation coefficient is less investigated. However, the acoustic fields with different spatial correlation coefficient, but the same sound pressure level can induce different structural vibration response. In this paper, based on the theory of spatial correlation characteristic of acoustic field, the theoretical curves of spatial correlation are obtained and the spatial correlation characteristic of reverberation chamber is studied. Acoustic test of satellite-rocket system level is developed applying a type of launch vehicle fairing and the regular distribution of acoustic field for launch vehicle is obtained. Based on the test data, the normalized characterization method of spatial correlation is validated. Compared with the interior acoustic field between reverberation chamber and fairing, the spatial correlation characteristic of reverberation chamber is close to the fairing. All these studies can provide the input for load and environment design and provide support for the fairing and satellite ground noise environmental test program.