仪表系统的数学模型是进行特性分析的基础，可分为时域模型（time domain model）、频域模型（frequency domain model）和离散模型（discrete model）。
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The principle and the formulation systems of fiber lasers were introduced, and a time-domain dynamic model and a spectral-domain model were established based on the optical-field traveling-wave rate equations and extended transfer matrix methods.2.
推导了环形腔光纤激光器的行波速率方程,在此基础上建立了时域和频域模型。
参考来源 - 可调谐环形腔掺铒光纤激光器的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
通过与已有的频域模型比较，证明了该数学模型的正确性。
The correctness of this model is proved by comparing it with the existing frequency-domain model.
为了获得鲁棒pid参数整定所需的过程模型，进行了闭环频域模型辨识的研究。
In order to obtain the dynamic model of the process to be used by robust PID, closed-loop model identification algorithm in frequency domain is researched.
研究了基于积分最小二乘指标的SISO时滞系统频域辨识与频域模型降阶问题。
Based on the integral least_squares index, a new approach to frequency_domain identification and model reduction of SISO systems with delay is proposed.
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