摘要
航空重力系统测量中,飞机发动机及机载环境引起的高频扰动将会严重影响航空重力系统的测量结果,而航空重力减振系统是有效解决高频振动的主要途径。因此,航空重力减振系统的减振效果,模态参数(固有频率、阻尼比和模态振型)是减振系统结构设计、评价的重要依据。笔者针对航空重力减振系统进行了多项振动试验,结果表明其固有频率避开了飞机发动机的周期振动频率,并且测点1在100～500 Hz高频中振动传递率在-18～-38dB,减振效果显著。
In the survey of the airborne gravity system, high frequency vibration caused by aircraft engine and airborne environment affects the precision of airborne gravity system measurement seriously, and this problem could be solved by the method of vibration reduction system. Therefore, the suppression effect of vibration reduction system and its modal parameters （ natural frequency, damping ratio and model shape） constitute the very important basis of the structural design and evaluation of the vibration reduction system. Aimed at solving the problems existent in the airborne gravity vibration reduction system, the authors made several vibration tests, and the result shows that the natural frequency can avoid the periodic vibration frequency of aircraft engine. In the frequency band of 100--500 Hz, the vibration transmissibility for the measuring point 1 is from -18 to -38 dB, and the vibration reduction effect is quite obvious.
出处
《物探与化探》
CAS
CSCD
2012年第6期960-965,共6页
Geophysical and Geochemical Exploration
基金
高新技术研究发展计划(863计划)(2006AA06A202)项目
中国国土资源航空物探遥感中心对地观测技术工程实验室课题(2010YFL03)
关键词
航空重力
高频振动
减振
模态参数
振动传递率
airborne gravity
high-frequency vibration
vibration suppression
model parameters
vibration transmissibility
