介绍了微重力模拟实验系统的特点,归纳了研究中的关键问题.总结了主要实现方法,包括:基于自由落体运动、基于抛物线飞行、气浮式、水浮式、吊丝配重式实验系统,以及硬件在环内(hardware in loop)的混合地面实验系统.讨论、比较了各种实...介绍了微重力模拟实验系统的特点,归纳了研究中的关键问题.总结了主要实现方法,包括:基于自由落体运动、基于抛物线飞行、气浮式、水浮式、吊丝配重式实验系统,以及硬件在环内(hardware in loop)的混合地面实验系统.讨论、比较了各种实验系统的应用背景及优缺点;在此基础上,提出了动力学模拟与运动学等效的两种思想,并建立了实验系统,以对路径规划、控制等关键算法进行评估和验证.展开更多
High-frequency seismic data components can be seriously attenuated during seismic wave propagation in unconsolidated （low-velocity） layers, resulting in reduced seismic resolution and signal-to-noise （S/N） ratio. ...High-frequency seismic data components can be seriously attenuated during seismic wave propagation in unconsolidated （low-velocity） layers, resulting in reduced seismic resolution and signal-to-noise （S/N） ratio. In this paper, first, based on Wiener filter theory, inverse filter calculations for near-surface absorption attenuation compensation were accomplished by analysis of the direct wave spectral components from different distances near the surface. The direct waves were generated by detonators in uphole shots and were acquired by receivers on the surface. The spatially varying inverse filters were designed to compensate for the frequency attenuation of 3D pre-stack CRG （common receiver-gather） data. After applying the filter to CRG data, the high frequency components were compensated with the low frequencies maintained. The seismic resolution and S/N ratio are enhanced and match better with synthetic seismograms and better meet the needs of geological interpretation.展开更多
文摘介绍了微重力模拟实验系统的特点,归纳了研究中的关键问题.总结了主要实现方法,包括:基于自由落体运动、基于抛物线飞行、气浮式、水浮式、吊丝配重式实验系统,以及硬件在环内(hardware in loop)的混合地面实验系统.讨论、比较了各种实验系统的应用背景及优缺点;在此基础上,提出了动力学模拟与运动学等效的两种思想,并建立了实验系统,以对路径规划、控制等关键算法进行评估和验证.
基金supported by China Petroleum Technology Innovation Fund Project(Grant No.0610740122)
文摘High-frequency seismic data components can be seriously attenuated during seismic wave propagation in unconsolidated （low-velocity） layers, resulting in reduced seismic resolution and signal-to-noise （S/N） ratio. In this paper, first, based on Wiener filter theory, inverse filter calculations for near-surface absorption attenuation compensation were accomplished by analysis of the direct wave spectral components from different distances near the surface. The direct waves were generated by detonators in uphole shots and were acquired by receivers on the surface. The spatially varying inverse filters were designed to compensate for the frequency attenuation of 3D pre-stack CRG （common receiver-gather） data. After applying the filter to CRG data, the high frequency components were compensated with the low frequencies maintained. The seismic resolution and S/N ratio are enhanced and match better with synthetic seismograms and better meet the needs of geological interpretation.
