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Then, a group of beelines are used to approximate the boundaries of the plates and the Fourier expansion method is applied to the boundary conditions along the plate boundaries.
其次,用一组直线段近似板的边界,并对边界作Fourier展开,作相应的阶次截断后,得到固有频率方程。
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Then, a group of beelines are used to approximate the boundaries of the plates and the Fourier expansion method is applied to the boundary conditions along the plate boundari...
其次,用一组直线段近似板的边界,并对边界作Fourier展开,作相应的阶次截断后,得到固有频率方程。
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On strength computation,the finite element models of rotating mirror were established according to the real structure of the mirror,and the rotating three-faced beryllium mirror were analysed.Results display that the surface deformation magnitude of the mirror is approximately 0.334 6 μm,and the maximum stress is 0.204 GPa at 600 m/s of edge linear speeed.The regions of maximum stress are on the axial hole and symmetric to symmetrical planes of mirror body,and keep beelines to surfaces.On the modal analysis,the results show that the first and second modals of bending vibration exist around 3.4×105 r/min and 6.6×105 r/min,which appear binate and orthogonal respectively,and another modal belongs to the first torsional vibration that occurs by 5.13×105 r/min.
运用该方法得出转镜镜面变形量、内部应力分布和振动模态参量的定量数值:在边缘线速度600 m/s下,三面体铍转镜的最大变形量为约0.334 6 μm;最大应力0.204 GPa,位于轴孔附近并与镜面距离最短处;两个在互相垂直平面内的一阶弯曲振动模态发生在3.4×105 r/min附近,一阶扭振点位于5.13×105 r/min附近,两个二阶弯曲振动点位于6.6×105 r/min附近。
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By connecting two eggs with the same design through no more than three beelines, your aim is to collect as many eggs as possible.
由连接两个鸡蛋具有相同的设计,通过不超过3 beelines ,您的目的是要收集很多蛋,尽可能。
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However, Results of wavelet analysis of linear chirp signals are beelines on time frequency scheme.
通常情况下,线性调频信号小波变换的结果在时间尺度图上呈现曲线的形式,而在时频图上呈现直线的形式。
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