模拟微硬盘读写通道伺服信号对微硬盘通道的设计以及测试都起着重要的作用,文章提出了一种基于高集成化直接数字频率合成技术的程控信号发生器实现模拟微硬盘读写通道伺服信号的设计方案,方案采用超大规模FPGA(field-pro-grammable log...模拟微硬盘读写通道伺服信号对微硬盘通道的设计以及测试都起着重要的作用,文章提出了一种基于高集成化直接数字频率合成技术的程控信号发生器实现模拟微硬盘读写通道伺服信号的设计方案,方案采用超大规模FPGA(field-pro-grammable logic)集成高速PDSP(programmable digital signal processor)和直接数字频率合成技术(DDFS)设计,经试验证明,与传统使用分离器件和集成电路设计方案相比,通过该设计方案产生信号的质量高,波形光滑,不用再另接滤波电路且能输出2-100次谐波,电路设计有集成化、低功耗,简单化、易现场修改、便于程控等优点.展开更多
文章提出了一种基于高集成化的直接数字频率合成技术构成的程控信号发生器的设计方案,用于模拟微硬盘读写通道的伺服信号,方案采用超大规模FPGA(field-programmable logic)集成PDSP(programmable digital signal processor)设计和直接...文章提出了一种基于高集成化的直接数字频率合成技术构成的程控信号发生器的设计方案,用于模拟微硬盘读写通道的伺服信号,方案采用超大规模FPGA(field-programmable logic)集成PDSP(programmable digital signal processor)设计和直接数字频率合成技术,试验结果证明,与传统使用分离器件设计方案相比,该方案能产生较高质量信号。电路设计有集成化、低功耗,简单化、易现场修改、便于程控等优点。展开更多
Aiming at the deficiency of diagnosis method based on vibration signal,a novel method based on speed signal with singular value decomposition and Hilbert transform(SVD-HT)is proposed.The fault diagnosis mechanism base...Aiming at the deficiency of diagnosis method based on vibration signal,a novel method based on speed signal with singular value decomposition and Hilbert transform(SVD-HT)is proposed.The fault diagnosis mechanism based on the speed signal is obtained by constructing the shaft misalignment fault model firstly.Then the SVD-HT method is applied to the processing of the speed signal.The accuracy of the SVD-HT method is verified by comparing the diagnosis results of the order spectrum method and the SVD-HT method.After that,the diagnosis results based on vibration signal and speed signal under no-load and load patterns are compared.Under the no-load pattern,the amplitudes of the speed signal components f_(r),2f_(r) and 4f_(r) are linear with the misalignment.In addition,under the load pattern,the amplitudes of the speed signal components f_(r),2f_(r) and 4f_(r) have a linear relationship with the load.However,the diagnosis result of the vibration signal does not have the above characteristics.The comparison results verify the robustness and reliability of the speed signal and SVD-HT method.The method presented in this paper provides a novel way for misalignment fault diagnosis.展开更多
文摘模拟微硬盘读写通道伺服信号对微硬盘通道的设计以及测试都起着重要的作用,文章提出了一种基于高集成化直接数字频率合成技术的程控信号发生器实现模拟微硬盘读写通道伺服信号的设计方案,方案采用超大规模FPGA(field-pro-grammable logic)集成高速PDSP(programmable digital signal processor)和直接数字频率合成技术(DDFS)设计,经试验证明,与传统使用分离器件和集成电路设计方案相比,通过该设计方案产生信号的质量高,波形光滑,不用再另接滤波电路且能输出2-100次谐波,电路设计有集成化、低功耗,简单化、易现场修改、便于程控等优点.
文摘文章提出了一种基于高集成化的直接数字频率合成技术构成的程控信号发生器的设计方案,用于模拟微硬盘读写通道的伺服信号,方案采用超大规模FPGA(field-programmable logic)集成PDSP(programmable digital signal processor)设计和直接数字频率合成技术,试验结果证明,与传统使用分离器件设计方案相比,该方案能产生较高质量信号。电路设计有集成化、低功耗,简单化、易现场修改、便于程控等优点。
基金National Key Research and Development Program of China(No.2017YFF0108100)。
文摘Aiming at the deficiency of diagnosis method based on vibration signal,a novel method based on speed signal with singular value decomposition and Hilbert transform(SVD-HT)is proposed.The fault diagnosis mechanism based on the speed signal is obtained by constructing the shaft misalignment fault model firstly.Then the SVD-HT method is applied to the processing of the speed signal.The accuracy of the SVD-HT method is verified by comparing the diagnosis results of the order spectrum method and the SVD-HT method.After that,the diagnosis results based on vibration signal and speed signal under no-load and load patterns are compared.Under the no-load pattern,the amplitudes of the speed signal components f_(r),2f_(r) and 4f_(r) are linear with the misalignment.In addition,under the load pattern,the amplitudes of the speed signal components f_(r),2f_(r) and 4f_(r) have a linear relationship with the load.However,the diagnosis result of the vibration signal does not have the above characteristics.The comparison results verify the robustness and reliability of the speed signal and SVD-HT method.The method presented in this paper provides a novel way for misalignment fault diagnosis.
