摘要
建立了五自由度的车载无人机的振动系统在随机路面激励下的数学模型 ,并获得路面不平度双激励下的功率谱矩阵 ,运用功率谱密度法求得频域上的频响特性和加速度的均方值。由路面功率谱反推路面不平度的方法 ,对A、B、C和D 4个国家等级路面不平度交替冲击的复杂情况进行了时域模拟 ,运用MAT LAB的Simulink工具 ,仿真了无人机在一次运载任务剖面中的载荷响应。
A 5 DOF UAV-on-Truck vibration system under excitation of random road surfaces is mathematically modeled. Power spectrum matrices are obtained from double excitations from multi-roughness road surfaces. Frequency response characteristics of the vibration system in frequency domain and rms values of the UAV vertical acceleration are evaluated using a power spectral density method. Using time-domain excitations derived from road surface power spectrums as the inputs to the vibration system, a time-domain simulation is performed for the response to impact on road surfaces with A,B,C and D level roughness. In this simulation, load responses of UAV are given for a ground carrying mission profile, using the Simulink tool in MATLAB.
出处
《飞机设计》
2004年第3期21-24,共4页
Aircraft Design
