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为了使得无人机载转台拥有更小的体积和质量,提出了一种新型机载球形转台的设计,该转台采用压电装置作为驱动源,取代了传统的电磁电机,并且替换了传统的串联驱动方式而采用了结构较为紧凑的并联驱动方式,从而达到了缩小转台体积,减少转台质量的目的。转台方位轴和俯仰轴的转动分别由一对驱动足独立驱动,以实现转台对目标的跟踪。将转台的数字化模型导入到Adams中进行多体动力学仿真,结果表明转台可以实现多方位旋转,符合预期。采用了Creo4.0软件对球形转台进行了建模,在给模型赋完材料后显示,该球形转台与拥有相同驱动力矩的电磁电机相比,质量减小了48%,体积减小了将近29%。将球形转台的有限元模型简化并导入ANSYS中进行模态分析,结果显示该球形转台的前六阶固有频率在1k Hz到10k Hz之间,而工况中干扰频率在100Hz以下,因此不会产生共振情况,而且各振型中最大形变量符合国家标准,保证了该转台的刚度。该球形转台的设计对同类转台的设计提供了借鉴。
In order to make the UAV turntable have a smaller size and quality, a new design of airborne spherical turntable is proposed. The turntable uses a piezoelectric device as a driving source to replace the traditional electromagnetic motor, and replaces the traditional series Drive mode and the use of a more compact parallel drive, so as to reduce the turntable size, reduce turntable quality purposes. Rotation of the azimuth and pitch axes of the turntable is independently driven by a pair of driving feet, so as to realize the tracking of the target by the turntable. The digital model of the turntable was imported into Adams for multi-body dynamics simulation. The results show that the turntable can achieve multi-directional rotation, as expected. Creo4.0 software was used to model the spherical turntable, after the completion of the model material shows that the spherical turntable with the same driving torque of the electromagnetic motor compared to 48% reduction in mass, the volume decreased by nearly 29 %. The finite element model of the spherical turntable was simplified and imported into ANSYS for modal analysis. The results showed that the first six natural frequencies of the spherical turntable were between 1k Hz and 10k Hz and the interference frequency was below 100Hz in the working condition. Resonance occurs, and the maximum deformation in each vibration mode conforms to the national standard, which ensures the rigidity of the turntable. The design of the spherical turntable provides the reference for the design of the similar turntable.