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Prof. Xianfeng Huang
Guangxi University

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0 building acoustics
0 Building environment
0 daylighting design
0 lighting environment
0 Thermal comfort and environmental quality

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Thermal comfort and environmental quality
daylighting design

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Journal article
Published: 05 April 2021 in Sustainability
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In hot summers, air conditioning (AC) and mechanical ventilation (such as fans) are used as cooling modes that strongly influence the resultant indoor environment, like thermal comfort and air quality in the shops of a Nanning arcade street (qilou). The air circulation mode in shops greatly affects the indoor thermal environment and level of air freshness. The approaches for effectively improving the indoor thermal comfort and air quality are developed in qilou street shops with air-conditioner in a humid and hot region in southern China. Consequently, the purpose of this study is to assess different ventilation schemes in order to identify the best one. By using two indices, i.e., the predicted mean vote (PMV) and the age of air (AoA), in situ measurement and numerical simulation are conducted to investigate humans’ thermal comfort in extreme summer. Then, the indoor thermal comfort and AoA levels in summer under three different ventilation schemes (upper-inlet–upper-outlet, upper-inlet–bottom-outlet, and side-inlet–side-outlet) are comparatively analyzed through numerical computations of the indoor thermal environment. The results show that the upper-inlet–upper-outlet mode of the AC ventilation scheme led to the creation of a favorable air quality and comfortable thermal environment inside the shop, which will help designers understand the influence of the ventilation scheme on the indoor thermal comfort and health environment.

ACS Style

Xianfeng Huang; Chen Qu. Research on Indoor Thermal Comfort and Age of Air in Qilou Street Shop under Mechanical Ventilation Scheme: A Case Study of Nanning Traditional Block in Southern China. Sustainability 2021, 13, 4037 .

AMA Style

Xianfeng Huang, Chen Qu. Research on Indoor Thermal Comfort and Age of Air in Qilou Street Shop under Mechanical Ventilation Scheme: A Case Study of Nanning Traditional Block in Southern China. Sustainability. 2021; 13 (7):4037.

Chicago/Turabian Style

Xianfeng Huang; Chen Qu. 2021. "Research on Indoor Thermal Comfort and Age of Air in Qilou Street Shop under Mechanical Ventilation Scheme: A Case Study of Nanning Traditional Block in Southern China." Sustainability 13, no. 7: 4037.

Journal article
Published: 14 February 2021 in Applied Sciences
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By extracting and simplifying the characteristics of commercial streets with arcades (Qilou) in Nanning, the tissue map of Qilou streets which reflects the urban morphology, including the road network form, block scale, building scale and other characteristics in a hot and humid area is obtained. In addition, the sunshine simulation is performed by using sunshine design software in an environment comprising streets with arcades to simulate street sunlight environments under various conditions. The relationship among street height-to-width ratio, sunshine hours, and street orientation angle is achieved by nonlinear fitting analysis. Then, a model is established to adjust the street height-to-width ratio based on sunshine requirement and street orientation. The finding indicated that when the street is north–south, it is suggested that the street height-to-width ratio is 0.95–1.13 to reduce sunshine hours effectively, and when the street is east–west, it is proposed that one side of the street should have a recessed space to improve the thermal conditions. The results of this study can serve as the specific guidelines that can be adopted in the redesign and reformation of commercial streets with arcades to achieve thermal comfort of Qilou streets in hot and humid areas.

ACS Style

Xianfeng Huang; Congmin Li; Zhixiang Zhuang. Analysis of Height-to-Width Ratio of Commercial Streets with Arcades Based on Sunshine Hours and Street Orientation. Applied Sciences 2021, 11, 1706 .

AMA Style

Xianfeng Huang, Congmin Li, Zhixiang Zhuang. Analysis of Height-to-Width Ratio of Commercial Streets with Arcades Based on Sunshine Hours and Street Orientation. Applied Sciences. 2021; 11 (4):1706.

Chicago/Turabian Style

Xianfeng Huang; Congmin Li; Zhixiang Zhuang. 2021. "Analysis of Height-to-Width Ratio of Commercial Streets with Arcades Based on Sunshine Hours and Street Orientation." Applied Sciences 11, no. 4: 1706.

Journal article
Published: 10 February 2021 in Sustainability
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In this study, based on the current daylighting situation of a museum sculpture exhibition hall, the exhibition space is classified according to the daylighting requirements of the sculptures. Additionally, the daylighting pattern for the sculpture exhibition hall and the display layout of the exhibits are summarized. The daylighting parameters of the exhibition space under different scenarios are calculated. The exhibition space is simulated and analyzed under three daylighting conditions (flat skylights, flat skylights with side windows, and flat skylights with high side windows), and the daylighting parameters are optimized based on the daylighting patterns and components. It is discovered that with the combination of flat skylights and high side windows, the daylight factor (DF) and uniformity of daylighting (UD) of the sculpture exhibition as well as glare rating of the windows are the most favorable. Therefore, the appropriate daylighting pattern and components are determined, and the corresponding optimization strategy for daylighting is proposed. The results show that the daylighting optimization strategy proposed herein can improve the daylighting quality of the museum sculpture exhibition space and yield a suitable light environment.

ACS Style

Xianfeng Huang; Shangyu Zhu. Optimization of Daylighting Pattern of Museum Sculpture Exhibition Hall. Sustainability 2021, 13, 1918 .

AMA Style

Xianfeng Huang, Shangyu Zhu. Optimization of Daylighting Pattern of Museum Sculpture Exhibition Hall. Sustainability. 2021; 13 (4):1918.

Chicago/Turabian Style

Xianfeng Huang; Shangyu Zhu. 2021. "Optimization of Daylighting Pattern of Museum Sculpture Exhibition Hall." Sustainability 13, no. 4: 1918.

Journal article
Published: 03 January 2020 in Energies
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With respect to the light environment of the exhibition halls for Chinese calligraphy and painting works in the museums, the daylighting design in these display spaces have been studied, the key design factors, such as daylighting pattern, and arrangement of exhibits are examined and explored by field trips. Then, the display spaces are divided into diverse categories whose sky light environments are predicted by the demands of exhibits. Under changed daylighting situations, the daylight parameters, i.e., daylight factor (DF) and DF uniformity, discomfort glare index (DGI) and luminance distribution are calculated. Thus, the proper daylighting pattern and elements in the exhibition halls will be decided. The optimization strategies that optimize the parameters of daylighting patterns and elements are presented. The studies have shown that the daylighting quality will improved by the implement of optimal design, and good luminance environment in the calligraphy and painting exhibition halls are obtained.

ACS Style

Xianfeng Huang; Shangyou Wei; Shangyu Zhu. Study on Daylighting Optimization in the Exhibition Halls of Museums for Chinese Calligraphy and Painting Works. Energies 2020, 13, 240 .

AMA Style

Xianfeng Huang, Shangyou Wei, Shangyu Zhu. Study on Daylighting Optimization in the Exhibition Halls of Museums for Chinese Calligraphy and Painting Works. Energies. 2020; 13 (1):240.

Chicago/Turabian Style

Xianfeng Huang; Shangyou Wei; Shangyu Zhu. 2020. "Study on Daylighting Optimization in the Exhibition Halls of Museums for Chinese Calligraphy and Painting Works." Energies 13, no. 1: 240.

Journal article
Published: 14 August 2019 in Sustainability
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By analyzing measurements of the thermal environment of a qilou (arcade building) street, this study used the relative warmth index (RWI) to evaluate the thermal comfort in the colonnade space of a qilou. The analysis of the influence of the temperature, humidity, and wind speed on the thermal comfort in the colonnade space of a qilou street was conducted, and it was shown that the ambient wind speed had a strong influence on the RWI, indicating that a proper increase in the wind speed positively affected thermal comfort in this space. Then, this study also analyzed the effects of different forms of qilou streets on the wind environment by employing computational fluid dynamics (CFD) and summarized the architectural design measures that can improve the thermal comfort, including adopting back chamfer, street gaps, and the appropriate sizing of building components. It was concluded that the wind environment of a qilou could be optimized in terms of these measures, and the average RWI value decreased by 0.06, effectively enhancing the thermal comfort in the colonnade space. The research findings are applicable toward designing a thermally comfortable environment in the transitional space.

ACS Style

Xianfeng Huang; Zhen Lu; Zhixiang Zhuang. Analysis of the Wind Environment to Improve the Thermal Comfort in the Colonnade Space of a Qilou Street Based on the Relative Warmth Index. Sustainability 2019, 11, 4402 .

AMA Style

Xianfeng Huang, Zhen Lu, Zhixiang Zhuang. Analysis of the Wind Environment to Improve the Thermal Comfort in the Colonnade Space of a Qilou Street Based on the Relative Warmth Index. Sustainability. 2019; 11 (16):4402.

Chicago/Turabian Style

Xianfeng Huang; Zhen Lu; Zhixiang Zhuang. 2019. "Analysis of the Wind Environment to Improve the Thermal Comfort in the Colonnade Space of a Qilou Street Based on the Relative Warmth Index." Sustainability 11, no. 16: 4402.

Journal article
Published: 07 January 2019 in Energies
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Existing large-signal control schemes for DC/DC converters formulate control strategies based primarily on nonlinear control theory, and the associated design and implementation are relatively complex. In this work, a decomposition modeling and inverse-system decoupling control method is proposed for DC/DC converters that operate under large-signal disturbances. First, a large-signal circuit-averaged model for DC/DC converters is established. The proposed control system has a double closed-loop control structure composed of a voltage loop and a current loop. Then, the voltage-loop and current-loop controlled subsystems are decoupled and compensated to first-order integral elements using the inverse system method. Several linear feedback controllers are designed for first-order integral systems under various optimization criteria using the optimal control theory. Simulation and experiment were performed on buck–boost converters with resistive and constant power loads. The results show that under the control of the proposed controller, all systems exhibited excellent dynamic and steady-state performance. The proposed method allows the disturbance control of the DC/DC converter, the dynamic behavior control of the voltage loop, and the current loop to become independent processes. The local controller design follows the classical linear control design method and is a simple and effective large-signal control strategy.

ACS Style

Yimin Lu; Haimeng Zhu; Xianfeng Huang; Robert D. Lorenz. Inverse-System Decoupling Control of DC/DC Converters. Energies 2019, 12, 179 .

AMA Style

Yimin Lu, Haimeng Zhu, Xianfeng Huang, Robert D. Lorenz. Inverse-System Decoupling Control of DC/DC Converters. Energies. 2019; 12 (1):179.

Chicago/Turabian Style

Yimin Lu; Haimeng Zhu; Xianfeng Huang; Robert D. Lorenz. 2019. "Inverse-System Decoupling Control of DC/DC Converters." Energies 12, no. 1: 179.

Conference paper
Published: 01 November 2018 in 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)
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Many DC/DC converters with voltage boosting functions have zeros on the right half of the complex plane; they are non-minimum phase systems. Conventional linear controllers have trouble obtaining the ideal control quality of simultaneously satisfying the performance requirements with respect to stability, speed, accuracy, robustness, and simplicity. This paper combines a proportional integral (PI) control rule with an adaptive parameter-adjusting circuit composed of memristors and adaptively adjusts the controller parameters through a memristor circuit to adapt to changes in system operation. The parameter update rules of voltage- and current-controlled memristors are discussed. The analysis indicates that under the control of the memristor-based adaptive PI controller, the closed-loop system's output deviation continuously decreases along the gradient and approaches a minimum. Simulations and experimental verification are performed using a boost converter as the controlled object. The results show that, compared with a conventional PI controller, the proposed controller is more robust, and it is suitable for controlling a power electronic system with nonlinearly time-varying uncertainty and disturbance.

ACS Style

Yimin Lu; Yangyang Wang; Xianfeng Huang. Adaptive Memristor-based PI Control of a DC/DC Converter Non-minimum Phase System. 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) 2018, 1 -6.

AMA Style

Yimin Lu, Yangyang Wang, Xianfeng Huang. Adaptive Memristor-based PI Control of a DC/DC Converter Non-minimum Phase System. 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC). 2018; ():1-6.

Chicago/Turabian Style

Yimin Lu; Yangyang Wang; Xianfeng Huang. 2018. "Adaptive Memristor-based PI Control of a DC/DC Converter Non-minimum Phase System." 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) , no. : 1-6.

Article
Published: 25 January 2017 in International Journal of Circuit Theory and Applications
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To achieve the satisfactory control performance of a dynamic system using a proportion-integration-differentiation (PID) controller, it is necessary that the three parameters of the PID controller are set to values that suit the system to be controlled. Most current applications employ fixed setting parameters that are not adequate for nonlinear time varying systems with uncertainty and disturbances. In this paper, we use neuron weighted tuning functions to develop self-tuning methods that can automatically tune the parameters of PID controllers. The weighting processes performed using voltage-controlled memristors and current-controlled memristor are discussed. It is proven that the output tracking error of a closed-loop system controlled by the proposed controllers and the weight update rules governed by the memristors descends toward its minimum. A simulation and experimental verification of the performances of these controllers in linear and nonlinear systems are included. This proposed PID controllers are shown to be more robust than conventional PID controllers. Copyright © 2017 John Wiley & Sons, Ltd.

ACS Style

Yimin Lu; Qianqian Liang; Xianfeng Huang. Parameters self-tuning PID controller circuit with memristors. International Journal of Circuit Theory and Applications 2017, 46, 138 -154.

AMA Style

Yimin Lu, Qianqian Liang, Xianfeng Huang. Parameters self-tuning PID controller circuit with memristors. International Journal of Circuit Theory and Applications. 2017; 46 (1):138-154.

Chicago/Turabian Style

Yimin Lu; Qianqian Liang; Xianfeng Huang. 2017. "Parameters self-tuning PID controller circuit with memristors." International Journal of Circuit Theory and Applications 46, no. 1: 138-154.

Conference paper
Published: 01 October 2010 in 2010 International Conference on Intelligent System Design and Engineering Application
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With respect to the high sound insulation requirement for a building, the double-leaf walls structure may be considered to employ. The Statistic Energy Analyses (SEA) can be applied to predict the sound insulation of a specified double-leaf wall. On the other hand, realistic engineering practice is a process of inversed sound insulation prediction, i.e. sound insulation requirement is merely known, the configuration and materials of a structure should be determined through inversed prediction. This paper, thus, adopted the artificial immune algorithm to establish the inverse sound insulation prediction model for double-leaf walls. By the proposed model, surface density, the thickness, the Young's modulus (or the longitudinal sound wave speed) of each panel and thickness of cavity will be predicted from inverse direction. Therefore, the material and even the configuration of a double-leaf wall can also be determined.

ACS Style

Xianfeng Huang; Yimin Lu. Inverse Sound Insulation Prediction to Double-Leaf Walls. 2010 International Conference on Intelligent System Design and Engineering Application 2010, 1, 892 -895.

AMA Style

Xianfeng Huang, Yimin Lu. Inverse Sound Insulation Prediction to Double-Leaf Walls. 2010 International Conference on Intelligent System Design and Engineering Application. 2010; 1 ():892-895.

Chicago/Turabian Style

Xianfeng Huang; Yimin Lu. 2010. "Inverse Sound Insulation Prediction to Double-Leaf Walls." 2010 International Conference on Intelligent System Design and Engineering Application 1, no. : 892-895.

Conference paper
Published: 01 September 2008 in 2008 IEEE International Conference on Automation and Logistics
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An approach to the modeling and regulation problem of a buck converter which relies on its hybrid nature is presented. The buck converter is modeled as a switched affine system. Then, using the stored energy in the inductor and the capacitor as the common Lyapunov function, switching rules and activation region of all the subsystems are defined to assess quadratic stability of the converter. Simulation results are provided and compared with those of PID control to demonstrate the validity of this approach. The proposed modeling and control methodology can be extended to other types of converter and port controlled Hamilton linear switched affine system.

ACS Style

Yimin Lu; Xianfeng Huang; Bo Zhang; Liyun Yin. Hybrid feedback switching control in a Buck converter. 2008 IEEE International Conference on Automation and Logistics 2008, 207 -210.

AMA Style

Yimin Lu, Xianfeng Huang, Bo Zhang, Liyun Yin. Hybrid feedback switching control in a Buck converter. 2008 IEEE International Conference on Automation and Logistics. 2008; ():207-210.

Chicago/Turabian Style

Yimin Lu; Xianfeng Huang; Bo Zhang; Liyun Yin. 2008. "Hybrid feedback switching control in a Buck converter." 2008 IEEE International Conference on Automation and Logistics , no. : 207-210.

Conference paper
Published: 01 January 2006 in 2006 6th World Congress on Intelligent Control and Automation
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Two new pulse width modulation (PWM) schemes: chaos-based sinusoidal PWM (SPWM) and chaos-based space vector PWM (SVPWM) are brought forward. There are cluster harmonics around the multiples of switching frequency in conventional SPWM and SVPWM output waves owing to their fixed switching frequencies. Chaos-based PWM strategies utilize a chaotic changing switching frequency to spread the harmonics continuously to a wideband area so that the peak harmonics can be reduced greatly. This can be an effective way to suppress harmonic and reduce ripple current and torque in induction motor drives. The good agreement between theory and simulation has approved the validity of this study

ACS Style

Yimin Lu; Xianfeng Huang; Bo Zhang; Zongyuan Mao. Two Chaos-Based PWM Strategies for Suppression of Harmonics. 2006 6th World Congress on Intelligent Control and Automation 2006, 1, 953 -957.

AMA Style

Yimin Lu, Xianfeng Huang, Bo Zhang, Zongyuan Mao. Two Chaos-Based PWM Strategies for Suppression of Harmonics. 2006 6th World Congress on Intelligent Control and Automation. 2006; 1 ():953-957.

Chicago/Turabian Style

Yimin Lu; Xianfeng Huang; Bo Zhang; Zongyuan Mao. 2006. "Two Chaos-Based PWM Strategies for Suppression of Harmonics." 2006 6th World Congress on Intelligent Control and Automation 1, no. : 953-957.