Because the restraint of PMB (permanent magnetic bearings) is the elastic restraint, suspended SDOF gyrocompass restrained by PMB, in fact, is not SDOF gyrocompass, but two DOFS gyrocompass.
考虑到永磁轴承约束为弹性约束，永磁轴承约束的悬挂式单自由度陀螺罗盘实质为永磁轴承约束的悬挂式二自由度陀螺罗盘。
The earthquake input energy spectrum of elastic single degree of freedom(SDOF) system under a world-wide ensemble of 40 earthquake records of different site types are studied.
本文以4种场地土条件下40条强震记录为输入，对弹性单自由度（SDOF）系统的地震输入能量谱进行了研究。首先研究了SDOF系统参数和地面运动参数对弹性地震输入能量谱的影响。
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