Volume 44,Issue 9,2021 Table of Contents

1 Simultaneous identification of structural parameter and external force with particle filter

LI Tianzhi , LIU Gang , ZHANG Liangliang

2021, 44(9):1-7. DOI: 10.11835/j.issn.1000-582X.2020.059

[Abstract](384) [HTML](841) [PDF 2.84 M](685)

Abstract:
To accomplish identification of parameters and force under unknown external force, the velocity, displacement, structural parameters and external force are simultaneously augmented into to the state vector for model formulation, and particle filter with good performance in nonlinear system is then used to identify both the parameters and force. There will be drift of the identified force during force identification due to the lack of velocity and displacement measurement. This paper uses trapezoidal integration and zero-phase high-pass filtering to calculate the velocity and displacement with acceleration. The calculated values are used to adjust the velocity and displacement obtained by particle filter at a specific interval to eliminate the drift. It is demonstrated in simulation that this method can provide relatively accurate estimation results and ameliorate the drift phenomenon during force identification.

2 Analysis of the model uncertainty for predicting the ultimate bearing capacity of strip footings on sand overlying clay

GUAN Yu , ZHANG Yibo

2021, 44(9):8-16,39. DOI: 10.11835/j.issn.1000-582X.2021.09.002

[Abstract](340) [HTML](670) [PDF 5.60 M](748)

Abstract:
A sand layer overlying clay is common in practice. The conventional Terzaghi's bearing capacity theory is unavailable in this type of nonhomogeneous soil. The semi-empirical methods toward addressing the bearing capacity of strip footings on sand overlying clay, which are widely used in geotechnical engineering, may yield unreliable solutions. In this paper, the bearing capacity of footings on sand overlying clay is evaluated using discontinuity layout optimization (DLO), which is a rigorously upper bound limit analysis method. A bearing capacity reduction factor is developed based on the conventional Terzaghi's bearing capacity theory, and a set of design charts of this factor for various scenarios is illustrated. Subsequently, a simplified regression-based approach, relevant to a wide range of geometric and strength parameters, is proposed. Based on a database of the bearing capacity of footings on sand overlying clay from prior literatures, the model uncertainty for the proposed method is validated and characterized.

3 Measurement and simulation optimization of light environment of traditional dwellings: the case study of Miao dwelling in Huangtu Village, Danzhai County, Southeast Guizhou

HUANG Haijing , DONG Zhang

2021, 44(9):17-30. DOI: 10.11835/j.issn.1000-582X.2020.214

[Abstract](433) [HTML](700) [PDF 18.17 M](586)

Abstract:
Because traditional dwellings are basically built by the villagers, and the light environment design is rarely considered, the indoor lighting effect of the building is poor. In order to improve the light environment of traditional dwellings, a light environment experiment was carried out on a representative Miao dwelling in Huangtu Village, Danzhai County, Southeast Guizhou. The light environment was studied in combination with the spatial characteristics of the dwellings. The results show that the daylighting performances of the main rooms do not meet the requirements of standard for daylighting design. The size and position of daylighting windows, the form of interior space, and the reflective properties of surface materials all have an impact on the interior light environment. Quantitative analysis of various influential factors was conducted by software simulation. With the premise of minimizing the impact of light environment transformation on the original architectural features and spatial structure, the comprehensive optimization strategies for light environment of traditional dwellings were put forward, such as adjusting the size and quantity of lighting windows, increasing the roof daylighting tiles and daylighting windows under the eaves, paving light color wallpaper, and setting adjustable reflective louver. The results of the study can provide reference for the protective transformation of interior lighting environment of traditional dwellings and the daylighting design of new dwellings.

4 Study on the trespass threshold of static light trespass on indoor activities of residents

FAN Qing , ZHANG Mingyu , SONG Jieqiao , YU Juan , YANG Xingzong

2021, 44(9):31-39. DOI: 10.11835/j.issn.1000-582X.2021.09.004

[Abstract](313) [HTML](800) [PDF 784.96 K](471)

Abstract:
Research shows that light trespass produced by static light sources for functional lighting such as roads and signs affects residents' indoor activities. Through subjective evaluation, the experiment based on the subjective feelings of residents was carried out combining, with the operation definition of threshold, and the luminance trespass thresholds of two kinds of light colors (yellow and white light), four area ratios (trespass full windows, 1/4 windows, 1/16 windows, 1/64 windows) of urban static white light trespass with normal indoor lighting conditions were calculated. The results show that the intensity of trepass is closely related to the dregree of trespass, the area ratio is negatively correlated with the degree of trespass and a power function equation of the luminance threshold and area ratio is obtained.

5 Indoor light thermal environment and strategy analysis of aerogel glass residential building in summer

ZHANG Yi , YANG Liu , LUO Zhixing

2021, 44(9):40-50. DOI: 10.11835/j.issn.1000-582X.2020.232

[Abstract](305) [HTML](941) [PDF 14.54 M](624)

Abstract:
Taking the aerogel glass residential building designed and constructed in Solar Decathlon China 2018 (SDC2018) as an example, this paper simulated the building in the design stage, and measured the indoor temperature and illumination after the building was built. The results show that the energy saving effect of aerogel glass was more significant than that of the wooden lattice envelope with 26.06% less energy consumption, but effective shading measures should be taken in summer. The indoor illumination of the aerogel glass room was greater than 300 lx, which met relevant design requirements. The improvement measures were put forward for the existing problems of this building, which was of great significance for the promotion and application of aerogel glass building.

6 Parametric plan optimization and structural intelligent design method of modular steel buildings

CHEN Shengge , ZHOU Ting , CHEN Zhihua , LIU Jiadi

2021, 44(9):51-66. DOI: 10.11835/j.issn.1000-582X.2021.09.006

[Abstract](460) [HTML](779) [PDF 10.47 M](694)

Abstract:
This article takes five-story steel structure modular building housing as an example to explore the complete chain of multi-objective optimization for parameterized plane and structural intelligent design. First of all, a parametric plane modeling and design method for steel structure building are proposed. Secondly, the Rhinoceros & Grasshopper modeling platform is used to write a Python script language to achieve structural intelligent design. Finally, the Ladybug & Honeybee building energy performance simulation plug-in and Karamba finite element structure are combined with Octopus data processing platform. Based on the two goals of total building energy consumption and steel consumption, the size of different rooms on the building plane and the size of structural members are designed and optimized to generate the Pareto optimal solution that meet the requirements of structural bearing capacity, and the correlation coefficients between parameter variables and the objective functions are obtained.

7 Energy saving and comfort optimization of shading control strategies in different climate zones

ZHOU Hanyu , LIU Gang , WANG Lixiong , LIU Kuixing

2021, 44(9):67-76. DOI: 10.11835/j.issn.1000-582X.2020.210

[Abstract](402) [HTML](1202) [PDF 2.48 M](796)

Abstract:
Shading design is one of the important factors that affect building energy saving, indoor light and thermal comfort. The sun shading system can reduce the solar radiation, cooling energy consumption in summer and glare, but at the same time, it will lead to higher lighting and heating energy consumption in winter. In order to study the energy saving and environmental comfort of typical shading control strategies for hotel buildings in the cold areas and the areas with the hot summer and warm winter in China, the effects of three shading forms and ten control strategies on energy consumption and comfort in different climatic zones are simulated by COMFEN. Their performances are assessed in respects of cooling, heating, lighting and total energy consumption, as well as light and thermal comfort and comprehensive optimization index. The simulation results show that the shading control strategy will affect the building energy consumption and indoor comfort. Optimal control strategies are given corresponding to different optimization objectives. In addition, some suggestions are provided for the selection of shading strategies and designs through the analysis of the differences between the two climatic regions.

8 Chaotic time series composite prediction of office building energy consumption

YU Junqi , DUAN Jiayin , ZHAO Anjun , JING Wenqiang , WANG Jiali

2021, 44(9):77-87. DOI: 10.11835/j.issn.1000-582X.2020.309

[Abstract](345) [HTML](660) [PDF 1.40 M](628)

Abstract:
The existing energy consumption prediction methods for office buildings fail to take into account the chaotic change characteristics of energy consumption data. In this paper, a method of energy consumption prediction for office buildings based on chaotic time series was proposed. The method first reconstructed the phase space of the time series of the research object, and judged that whether it had chaotic characteristics. Then the combination model of chaos theory was established and applied in vector regression for training. Finally, Markov chain was used to eliminate the cumulative errors caused by parameter transfer of the combination model, and the final prediction result was obtained. In order to verify the effectiveness of the algorithm, the energy consumption monitoring data of an office building in Xi'an was taken as an example for analysis. The proposed method was compared with other prediction methods, such as nonlinear autoregressive neural network and support vector regression. The experimental results show that the prediction accuracy of the chaotic time series combination model modified by Markov was significantly improved, the prediction result was better than those of other models and more consistent with the change law of energy consumption of office buildings, providing effective data support for energy conservation optimization.

9 Optimization of air supply parameters based on thermal comfort under stratum ventilation with pulsating air supply

LIAO Chunhui , CHENG Yong , TIAN Xue

2021, 44(9):88-97. DOI: 10.11835/j.issn.1000-582X.2021.09.009

[Abstract](434) [HTML](739) [PDF 1.71 M](876)

Abstract:
Pulsating air supply combined with stratum ventilation has the potential to improve thermal comfort on the premise of ensuring good energy efficiency and indoor air quality. An indoor three-dimensional transient computational fluid dynamics (CFD) model for pulsating air supply combined with stratum ventilation was established and verified, and 26 simulation cases were calculated. Based on the dynamic thermal comfort evaluation indexes verified by experiments, namely the time-averaged predicted mean vote (TAPMV) and time-averaged percentage of dissatisfied due to draft (TAPD), the influences of various parameters of the pulsating air supply function (i.e., total period duration, ratio of the high-velocity duration to the low-velocity duration, and air supply velocity) on thermal comfort were investigated. One of the multi-criteria optimization methods, i.e., Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS) was used. It was found that, when the total cycle duration was 300 s, the ratio of the high-velocity duration to the low-velocity duration was 1, the air supply velocity of the high-velocity duration was 1.95 m/s, and the air supply velocity of the low-velocity duration was 1.05 m/s, the comprehensive evaluation of thermal comfort is the best.

10 Path planning and charging strategy for electric logistics vehicles with clustering non-dominated sorting

XU Tingting , HU Xiaorui , HU Wen , LI Shuangqing , CHI Lei

2021, 44(9):98-108. DOI: 10.11835/j.issn.1000-582X.2021.09.010

[Abstract](313) [HTML](682) [PDF 1018.51 K](685)

Abstract:
The limited battery capacity, long charging time and inadequate supporting facilities of electric logistics vehicles restrict their effective promotion in the logistics and distribution field. In this paper, an improved cluster non-dominated sorting genetic algorithm (AP-NSGA-II) is proposed to solve the multi-objective route optimization problem of electric logistics vehicles. A charging strategy is established:dividing the distribution clusters by designing weighted AP clusters to avoid the randomness and blindness of the initial population, and reducing the running time and complexity of the non-dominated sorting algorithm by the scale of distribution points within the clusters. According to the distribution and distance relationship of charging stations, the electric logistics vehicles execute partial charging strategy. Finally, the effectiveness of the algorithm is demonstrated by simulation experiments, and the differences between full charging and partial charging conditions for electric logistics vehicles are compared.

11 Task scheduling optimization based on QoS cloud computing

NIE Qingbin , CHEN Feixu , QIN Meifeng , CAO Yaoqin

2021, 44(9):109-116. DOI: 10.11835/j.issn.1000-582X.2021.09.011

[Abstract](325) [HTML](1072) [PDF 752.00 K](772)

Abstract:
Cloud computing technology is in rapid development. In order to meet the increasingly diverse cloud computing user service quality (QoS) requirements and to improve the efficiency of cloud computing resource scheduling, a cloud computing resource scheduling optimization algorithm based on improved ant colony algorithm is proposed, including establishing cloud computing-resource model and user QoS requirements model. In order to obtain better results and solve the problem of the local optimal solution caused by the fast convergence of traditional ant colony algorithm, a random selection mechanism is added to the traditional ant colony algorithm. The time, cost and effective availability fitness factor of results are optimized and improved to obtain the global optimal solution. The traditional ant colony algorithm, Min-Min scheduling algorithm and improved ant colony optimization algorithm are compared by simulation experiments. Experimental results show that the improved ant colony optimization algorithm has advantages in scheduling efficiency, cost saving, time-saving and quality results in task execution.

12 Distributed power control technique of cognitive radio Ad hoc network based on supermodel game

LI Xianglu , HOU Dong , TIAN Jie

2021, 44(9):117-131. DOI: 10.11835/j.issn.1000-582X.2021.09.012

[Abstract](411) [HTML](605) [PDF 2.10 M](545)

Abstract:
In this paper, a distributed power control technique is proposed for Ad hoc network composed of secondary users (SU) within a single-hop cognitive radio Ad hoc network (CRAHN) application scenario in Interweave mode to maximize the capacity of the secondary network. Once authorized spectrum becomes idle, SUs in the secondary network will use authorized spectrum for concurrent communication, which aims at optimizing the transmission power of each SU so as to optimize the network spectrum efficiency. We first introduce the optimization approximation model of network capacity according to the given application scenario. In order to solve the non-convex problem, we establish the equivalent game model based on the network capacity optimization problem. Then we prove the existence and uniqueness of Nash equilibrium under the condition of different SINR. Finally, we propose a distributed power control algorithm based on Gradient Play method to realize optimal resource allocation. Simulation results show that the proposed algorithm can support a certain number of concurrent communication users and improve the spectral efficiency of the network system to a certain degree.

13 RiskRank: an analysis method of network risk propagation

ZHANG Zhigang , CHANG Chaowen , HAN Peisheng , HOU Xiang

2021, 44(9):132-138. DOI: 10.11835/j.issn.1000-582X.2021.09.013

[Abstract](857) [HTML](840) [PDF 636.61 K](835)

Abstract:
This paper proposes a RiskRank method to analyze the network risk propagation by studying the path and law of the network risk propagation. By computing the similarity and proximity between network nodes, a graph of network risk propagation is built, based on which a network risk propagation model is trained by iterations of random walk. The model is used to dynamically analyze the process of network risk propagation and quantitively evaluate the risk of network nodes. A high-risk clustering method is proposed based on the density clustering algorithm to isolate the high-risk area, thus controlling the security risk. The experimental results show that the accuracy, the precision and the recall of the RiskRank model is 97.4%, 98.1% and 86.4%, respectively.

14 Optimization design method of surface plasmon resonance based photonic crystal fiber polarization filter

JIA Pinggang , ZUO Fangjun , LIU Lei , AN Guowen

2021, 44(9):139-146. DOI: 10.11835/j.issn.1000-582X.2021.216

[Abstract](350) [HTML](861) [PDF 3.69 M](745)

Abstract:
In this paper, a method for optimizing the performance of photonic crystal fiber (PCF)polarization filter based on the surface plasmon resonance (SPR) effect was proposed. The method was realized by using the asymmetry of the metal filler and the refractive index environment around the core. The study shows that the effective refractive index of the surrounding materials could be effectively controlled by the special design features of the core and metal filler of the photonic crystal fiber to realize the birefringence effect of the metal plasma mode and the birefringence of the core mode of the fiber. Therefore, when the core mode and metal surface plasmon mode satisfy the phase matching conditions, the polarization filtering effect could be achieved, and a good extinction ratio could be obtained without complex structure design of the photonic crystal fiber, which reduced the difficulty of device preparation and solved the problem that the designed fiber structure could not realize the actual preparation.

Home

Volume 44,Issue 9,2021 Table of Contents

Current Issue

Volume

Issue

Most Read

Most Cited

Most Downloaded