Due to its inherent safety feature, the modular high temperature gas-cooled reactor (MHTGR) has been seen as one of the best candidates in building next generation nuclear plants (NGNPs). Since the MHTGR dynamics has ...Due to its inherent safety feature, the modular high temperature gas-cooled reactor (MHTGR) has been seen as one of the best candidates in building next generation nuclear plants (NGNPs). Since the MHTGR dynamics has high nonlinearity, it is necessary to develop nonlinear power-level controller which is not only beneficial to the safe, stable, efficient and autonomous operation of the MHTGR but also easy to be implemented practically. In this paper, based on the concept of shiftedectropy and the physically-based control design approach, it is proved theoretically that the simple proportional-differential (PD) output-feedback power-level control can provide globally asymptotic closed-loop stability. Numerical simulation results verify the theoretical results and show the influence of the controller parameters to the dynamic response.展开更多
Small modular reactors(SMRs) are beneficial in providing electricity power safely and viable for specific applications such as seawater desalination and heat production. Due to its inherent safety feature, the modular...Small modular reactors(SMRs) are beneficial in providing electricity power safely and viable for specific applications such as seawater desalination and heat production. Due to its inherent safety feature, the modular high temperature gas-cooled reactor(MHTGR) is considered as one of the best candidates for SMR-based nuclear power plants. Since its dynamics presents high nonlinearity and parameter uncertainty, it is necessary to develop adaptive power-level control, which is beneficial to safe, stable, and efficient operation of MHTGR and is easy to be implemented. In this paper, based on the physically-based control design approach, an adaptive outputfeedback power-level control is proposed for MHTGRs. This control can guarantee globally bounded closedloop stability and has a simple form. Numerical simulation results show the correctness of the theoretical analysis and satisfactory regulation performance of this control.展开更多
矿用轴流式局部通风机在工作时产生强烈的噪声,严重危害工作人员的身心健康,降低风机噪声就成为亟待解决的问题。以一台FBS No 8.0型矿用两级轴流局部通风机为研究对象,采用大涡模拟(Large Eddy Simulation,LES)与基于Lighthill声类比的...矿用轴流式局部通风机在工作时产生强烈的噪声,严重危害工作人员的身心健康,降低风机噪声就成为亟待解决的问题。以一台FBS No 8.0型矿用两级轴流局部通风机为研究对象,采用大涡模拟(Large Eddy Simulation,LES)与基于Lighthill声类比的FW-H(Ffowcs Williams-Hawkings)模型相结合的方法,针对前级动叶5种周向非均匀分布方案,分别模拟得到风机的声功率级分布和不同区域气动噪声的时频特性,并与前级动叶周向均匀分布方案进行比较。结果表明:前级动叶的周向非均匀分布,打破其尾迹气流对下游导叶的周期性冲击,削弱前级动叶与中导叶之间的周期性干涉噪声,降低叶顶附近、叶片尾缘处和叶根处的声功率级;与前级动叶周向均匀分布的原风机叶顶区域压力脉动的时域特征相比前级动叶周向非均匀分布仅使其相位发生改变,幅值并无明显变化;考察的5种动叶周向非均匀分布方案,均能使风机在通过频率处发生调制现象,即将基频和谐频处所对应的离散噪声峰值均匀地分布于两侧,从而显著降低风机在通过频率处的离散噪声。展开更多
文摘Due to its inherent safety feature, the modular high temperature gas-cooled reactor (MHTGR) has been seen as one of the best candidates in building next generation nuclear plants (NGNPs). Since the MHTGR dynamics has high nonlinearity, it is necessary to develop nonlinear power-level controller which is not only beneficial to the safe, stable, efficient and autonomous operation of the MHTGR but also easy to be implemented practically. In this paper, based on the concept of shiftedectropy and the physically-based control design approach, it is proved theoretically that the simple proportional-differential (PD) output-feedback power-level control can provide globally asymptotic closed-loop stability. Numerical simulation results verify the theoretical results and show the influence of the controller parameters to the dynamic response.
文摘Small modular reactors(SMRs) are beneficial in providing electricity power safely and viable for specific applications such as seawater desalination and heat production. Due to its inherent safety feature, the modular high temperature gas-cooled reactor(MHTGR) is considered as one of the best candidates for SMR-based nuclear power plants. Since its dynamics presents high nonlinearity and parameter uncertainty, it is necessary to develop adaptive power-level control, which is beneficial to safe, stable, and efficient operation of MHTGR and is easy to be implemented. In this paper, based on the physically-based control design approach, an adaptive outputfeedback power-level control is proposed for MHTGRs. This control can guarantee globally bounded closedloop stability and has a simple form. Numerical simulation results show the correctness of the theoretical analysis and satisfactory regulation performance of this control.
