CAJ | 학술논문

针对直管式科里奥利质量流量计固有频率高且相位差小、难以实现高精度测量的问题，对数字式过零检测和计及负频率的DTFT这两套计算频率和相位差的算法进行深入研究，评估其测量的精度和处理的实时性，以说明将其应用于直管式科氏质量流量计的可行性。选择能够满足信号实时处理要求的DSP芯片TMS320C6726为处理核心，研制科氏质量流量变送器。针对直管式科氏质量流量计信号处理的难点和DSP芯片上外围模块资源的局限性，给出变送器硬、软件设计方案，实时实现两套算法。对研制的变送器进行处理时间测试、零点稳定性测试、电信号测试和水流量标定实验。结果表明，所研制的变送器具有较好的处理实时性和精度。
침대직관식과리오리질량류량계고유빈솔고차상위차소、난이실현고정도측량적문제，대수자식과령검측화계급부빈솔적DTFT저량투계산빈솔화상위차적산법진행심입연구，평고기측량적정도화처리적실시성，이설명장기응용우직관식과씨질량류량계적가행성。선택능구만족신호실시처리요구적DSP심편TMS320C6726위처리핵심，연제과씨질량류량변송기。침대직관식과씨질량류량계신호처리적난점화DSP심편상외위모괴자원적국한성，급출변송기경、연건설계방안，실시실현량투산법。대연제적변송기진행처리시간측시、영점은정성측시、전신호측시화수류량표정실험。결과표명，소연제적변송기구유교호적처리실시성화정도。
It is difficult to achieve high precision measurement for straight-tube type Coriolis mass flowmeters be-cause of their characteristics of high resonance frequency and small phase difference.To solve this problem, two sets of algorithms, digital zero-crossing detection and DTFT considering negative frequency contribution are re-searched deeply to evaluate their measurement accuracy and processing speed .And the results show that these two algorithms are feasible for the signal processing of straight-tube type Coriolis mass flowmeter .A Coriolis mass flow transmitter is developed by choosing TMS320C6726 chip as the core microprocessor to meet the requirement of real-time processing.Aiming at the difficulties of signal processing of straight-tube type Coriolis mass flowmeter and the resource limitation of TMS320C6726, the design schemes of transmitter hardware and software are presented and the algorithms are realized in real-time.System tests and water flow calibrations of the transmitter are performed . The experimental results show that the developed transmitter possesses high processing speed and accuracy .