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有限差分法模拟单位冲激函数声波在钻柱中传播

DOI: 10.6052/1000-0879-12-070, PP. 40-44

Keywords: 单位冲激函数声信号,周期性管结构,有限差分法,数值模拟,通带

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Abstract:

为实现声波为载波,钻柱为信道传输井下信息的目的,了解声波在钻柱中的传输规律是必要的.将钻柱简化为理想周期性管结构,利用有限差分方法,对单位冲激函数声信号在钻柱中传播进行了模拟,分析接收信号时域及频域分布得出响应信号持续时间较长,信号随时间增长衰减,且最大幅值较输入信号小;钻柱结构的信道为梳状滤波器结构;通带存在谐振尖峰,尖峰数量与钻杆及接头数量有关.模拟结果与同类研究成果有较好的一致性.

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