Vegetation plays a key role in improving wind environment of residential districts,and is helpful for creating a comfortable and beautiful living environment.The optimal design of vegetation for wind environment impro...Vegetation plays a key role in improving wind environment of residential districts,and is helpful for creating a comfortable and beautiful living environment.The optimal design of vegetation for wind environment improvement in winter was investigated by carrying out field experiments in Heqingyuan residential area in Beijing,and after that,numerical simulation with SPOTE(simulation platform for outdoor thermal environment) experiments for outdoor thermal environment of vegetation was adopted for comparison.The conclusions were summarized as follows:1) By comparing the experimental data with simulation results,it could be concluded that the wind field simulated was consistent with the actual wind field,and the flow distribution impacted by vegetation could be accurately reflected;2) The wind velocity with vegetation was lower than that without vegetation,and the wind velocity was reduced by 46%;3) By adjusting arrangement and types of vegetation in the regions with excessively large wind velocity,the pedestrian-level wind velocity could be obviously improved through the simulation and comparison.展开更多
Sloshing experiment is crucial to determine the reaction performance of regeneration columns on an offshore floating platform.A novel type of column motion simulating device and a Marine Predator Algorithm-based Slidi...Sloshing experiment is crucial to determine the reaction performance of regeneration columns on an offshore floating platform.A novel type of column motion simulating device and a Marine Predator Algorithm-based Sliding Mode Controller(MPA-SMC)are proposed for such sloshing experiments.The simulator consists of a Stewart platform and a steel framework.The Stewart platform is located at the column's center of gravity(CoG)and supported by the steel framework.The platform's hydraulic servo system is controlled by a sliding mode controller with parameters optimized by MPA to improve robustness and precision.A numerical sloshing experiment is conducted using the proposed device and controller.The results show that the novel motion simulator has lower torque during the column sloshes,and the proposed controller performs better than a well-tuned PID controller in terms of target tracking precision and anti-interference capability.展开更多
冷水机组是建筑暖通系统中供冷/供热的核心设备,其运行工况复杂多变,且易受环境波动影响。对此,该文提出了一种基于多模型自适应预测控制(multiple model adaptive predictive control,MMAPC)的冷水机组智能调控策略。首先,根据热力学...冷水机组是建筑暖通系统中供冷/供热的核心设备,其运行工况复杂多变,且易受环境波动影响。对此,该文提出了一种基于多模型自适应预测控制(multiple model adaptive predictive control,MMAPC)的冷水机组智能调控策略。首先,根据热力学机理分析建立了冷水机组的机理模型;然后,基于模型预测控制理论,结合自适应加权的控制变量融合方法,设计了冷水机组的多模型自适应预测控制策略;最后,为方便多模型自适应控制策略的部署与测试,研发了可实现数据解析及自主决策的冷水机组调控实验平台。在三种典型工况的对比实验中,所提出多模型自适应预测控制策略比传统控制的平均跟踪误差降低了70%。展开更多
基金Project(50878111) supported by the National Natural Science Foundation of China
文摘Vegetation plays a key role in improving wind environment of residential districts,and is helpful for creating a comfortable and beautiful living environment.The optimal design of vegetation for wind environment improvement in winter was investigated by carrying out field experiments in Heqingyuan residential area in Beijing,and after that,numerical simulation with SPOTE(simulation platform for outdoor thermal environment) experiments for outdoor thermal environment of vegetation was adopted for comparison.The conclusions were summarized as follows:1) By comparing the experimental data with simulation results,it could be concluded that the wind field simulated was consistent with the actual wind field,and the flow distribution impacted by vegetation could be accurately reflected;2) The wind velocity with vegetation was lower than that without vegetation,and the wind velocity was reduced by 46%;3) By adjusting arrangement and types of vegetation in the regions with excessively large wind velocity,the pedestrian-level wind velocity could be obviously improved through the simulation and comparison.
文摘Sloshing experiment is crucial to determine the reaction performance of regeneration columns on an offshore floating platform.A novel type of column motion simulating device and a Marine Predator Algorithm-based Sliding Mode Controller(MPA-SMC)are proposed for such sloshing experiments.The simulator consists of a Stewart platform and a steel framework.The Stewart platform is located at the column's center of gravity(CoG)and supported by the steel framework.The platform's hydraulic servo system is controlled by a sliding mode controller with parameters optimized by MPA to improve robustness and precision.A numerical sloshing experiment is conducted using the proposed device and controller.The results show that the novel motion simulator has lower torque during the column sloshes,and the proposed controller performs better than a well-tuned PID controller in terms of target tracking precision and anti-interference capability.
文摘冷水机组是建筑暖通系统中供冷/供热的核心设备,其运行工况复杂多变,且易受环境波动影响。对此,该文提出了一种基于多模型自适应预测控制(multiple model adaptive predictive control,MMAPC)的冷水机组智能调控策略。首先,根据热力学机理分析建立了冷水机组的机理模型;然后,基于模型预测控制理论,结合自适应加权的控制变量融合方法,设计了冷水机组的多模型自适应预测控制策略;最后,为方便多模型自适应控制策略的部署与测试,研发了可实现数据解析及自主决策的冷水机组调控实验平台。在三种典型工况的对比实验中,所提出多模型自适应预测控制策略比传统控制的平均跟踪误差降低了70%。
