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1.
To carry out the deep space exploration tasks near Sun-Earth Libration point L2, the CRTBP dynamic model was built up and the numerical conditional quasi-periodic orbit (Lissajous orbit) was computed near L2. Then, a formation controller was designed with linear matrix inequality to overcome the difficulty of parameter tuning. To meet the demands of formation accuracy and present thruster’s capability, a threshold scheme was adopted for formation control. Finally, some numerical simulations and analysis were completed to demonstrate the feasibility of the proposed control strategy. 相似文献
2.
基于高速数据采集的阻抗测试 总被引:2,自引:0,他引:2
以高速A/D卡配合恒电位仪,设计了一套包括正弦波输出、高速数据采集、实时图形显示的腐蚀电化学阻抗测试系统。应用非线性最小二乘法对李沙育(Lissajous)方程进行拟合,从而求出腐蚀体系的复数电极阻抗(Z),并绘制成奈奎斯(Nyquist)阻抗图进行参数解析,实例测量表明,在1kHz ̄0.01Hz的频率范围内,其测试结果与Solartron 1250FRA具有一致性。 相似文献
3.
According to the requirement of multi-parameter time and frequency measurement without frequency normalization,a different frequency synchronization theory is proposed based on Lissajous figure method and the variation law of Lissajous figure which are used in practice teaching of frequency measurement.The theory can achieve high-precision transmission and comparison of time and frequency and precise locking and tracking of phase and frequency,improve the level of scientific research on time and frequency for postgraduate,and promote practice teaching innovation of time frequency measurement for undergraduate.Utilizing the ratio of horizontal and vertical inflection point of the Lissajous figure,the nominal frequency of the measured signal is precisely calculated.The frequency deviation between the measured frequency and its nominal frequency can be obtained by combining the turning cycle of the Lissajous figure.By observing the phase relationship between the frequency standard signal and the measured signal,the accurate measurement of the frequency isimplemented.Experimental results show that the direct measurement and comparison better than the 10-11 order of magnitude with common frequency source can be fmished between any signal frequencies.The frequency measurement method based on the theory has the advantage of simple operation,quick measurement speed,small error,low noise and high measurement precision.It plays an important role in time synchronization,communications,metrology,scientific research,educational technology practice and equipment and other fields. 相似文献
4.
Drawing embeds time within itself, notating changes in space and duration. For Babak Bryan and Henry Grosman , founding partners of BanG studio in Long Island City, New York: ‘The drawing is a result of process, but it also describes process.’ It is only through this temporal practice that an essential connection is developed between drawing and building. With the widespread adoption of building information modelling (BIM), linear graphic representation finds itself in crisis, challenged by the static inertia of the model. As Bryan and Grosman describe, the well-crafted drawing remains essential to their studio's approach informing the method of ‘making and remaking’. 相似文献
5.
日-地系拉格朗日点任务及其转移轨道设计方法 总被引:2,自引:0,他引:2
刘建忠 《导弹与航天运载技术》2009,(1)
绕日-地系拉格朗日点的深空探测任务越来越多,这些任务的目标轨道一般为Halo轨道或Lissajous轨道.介绍了3种从地球停泊轨道出发到拉格朗日点的转移轨道设计方法,并进行了对比.最后以Az=-800 000 km的Halo轨道为例,验证了直接转移轨道设计方法的有效性. 相似文献
6.
首先采用多维图形法对拍振的小频差问题进行了仿真分析和试验,将传统的二拍振动理论扩展到多源拍振,获得了拍振的上下限幅值和基频,通过仿真试验验证了理论解的正确性;然后提出了观测小频差现象的多维图形法,绘制了二拍的Lissajous图形和三拍的扭线面图形,对不同频差得到的拍图进行了分析.分析发现,Lissajous图形和扭线... 相似文献
7.
电极结构对介质阻挡放电参数的影响研究 总被引:1,自引:1,他引:0
为了优化介质阻挡放电(DBD)反应器设计,提高放电效率,提出一种针阵列芒刺状棒电极结构。利用电压-电荷Lissajous图形法,研究了光滑铜棒、螺纹铜棒和针阵列芒刺状铜棒电极等反应器电极结构对DBD放电参数的影响。实验结果表明,随着外加激励电压的升高,5种电极结构的放电功率P和平均放电电流Im及周期传输电荷量Q都随之增大。相同激励电压下,针阵列芒刺状棒电极的P、Im、Q值最大。针阵列芒刺状铜棒电极的气隙等效电容Cg随电压的升高呈震荡形式增加,而光滑电极和螺纹电极的Cg随电压的升高呈减小的趋势。研究结果表明,针阵列芒刺状铜棒电极更有利于挥发性有机物的去除,针间距越小,能量利用率越高。 相似文献
8.
9.
The interaction of the Lissajous singularity and singular Lissajous line carried by non-paraxial polychromatic beams is studied. It has been found that with propagation the singular Lissajous line breaks into more than two Lissajous singularities, pairs creation and annihilation of Lissajous singularities, the handedness reversal and change in the degree of polarization of Lissajous singularities, as well as the change in the shape of Lissajous figures may take place. 相似文献
10.