Analysis on Stability for Uncertainty Complex Control System Based on Knowledge

Concept of stability is vague, but it is basic characteristic of dynamic system, and precondition that make all kinds of control system run normally. Today it is still a challenge to analyze stability for uncertainty complex control system, whose mathematic modeling is impossible or very difficult, so it is very hard to judge whether a system running is stable or not by mathematic stability criterion. A kind of analyzing method is presented, which combine absolute stability with self-locked concept of heuristic search, it may analyze system stability in more range through adjusting self-collected loop parameters for uncertain control system based on knowledge control model. It is shown that stability analyzing method is effective and suitable for practical physical system in the engineering project.     

Voltage Stability Control of Local Power System

In this paper,the conception of bus voltage stability control area of local powersystem is presented,based on the practical criterion for voltage stability calculated by the real-timeinformation and the quasi-real time information form the power system.The method is test6d onIEEE-30-bus test system and results are satisfactory.     

Vehicle Lateral Stability Control Based on Sliding Model Control

In view of the vehicle cornering or path changing under ultimate handling maneuver, a 3-DOF nonlinear vehicle dynamics model which takes the vehicle lateral velocity, yaw rate and body roll angle as the State variables is presented. Based on the dynamic analysis, the method which using additional yaw moment produced by different longitudinal braking force among each wheels to improving vehicle handling stability in emergency situations is discussed. Considering the sideslip angle as one of the vehicle state variables is difficult to measuring, the sideslip angle estimation based on vehicle dynamic model and kinematics is designed. And then, based on the theory of siding model control, the combining sliding model control system is founded, which taking the vehicle yaw rate and body side-slip angle errors between the estimated and the real as the input variables, and taking the braking torque and the steering angle as control aims. The simulation results indicate that the control method can effectively improve the vehicle lateral handling stability.     

The Building and Roof Garden

The roof garden has great functioning of smoothing the shortage of land resource in the city and making use of the land resource diversity and efficiently. It is an efficient and reasonable way to exploit the open space the roof of the building. From the classic roof garden of the world, we can find out that roof garden has close relationship with the building. Roof garden is different with other kind landscape in the city, it needed cooperation of landscape architect and architect from at the stages of design, construction, upholding and management. We should attach importance to roof garden in the construction of building.     

Research on Assembly Construction, Positioning Control and its Detecting Technology for Retractable Roof Structure of Glass Skylight in Guiyang Southwest International Trade City

The retractable roof structures are developing technology for commercial buildings. The charecteristics of retractable roof structure of glass skylight, which is defferent with other retractable roof structure were introduced through an actual project in     

Exponential Stability Analysis for TS-model-based Fuzzy Chaotic Control Systems With Delays

The issue of exponential stability for TS-model-based fuzzy chaotic control systems with constant or time-varying delays is investigated. A linear-feedback fuzzy controller is designed using parallel dispersal compensation technique for a large class of chaotic control systems. By means of the Lyapunov-Krasovskii functional approach in combination of the linear matrix inequality and differential inequality techniques, the criteria for exponential stability of the TS-model-based fuzzy controller are derived, and the corresponding control laws are presented. The results are easy to be calculated numerically because of the linear matrix inequalities representation.     

Analysis on Wind-induced Dynamic Response of Arched Corrugated Metal Roof

It is generally considered that the seismic response of arched corrugated metal roof is not the control factor of structure design because of its light dead weight, but the wind-induced dynamic response on the structure is significant, so more attention must be paid to it. First, the wind simulation of the structure by AR model is carried out. Then, the TRANS method in the ANSYS is used to calculate the dynamic responses in time domain to compare the results with those in frequency domain in order to verify the validity of the two methods.     

Dynamic Heat Transfer Analysis of a Water Storage Roof

On the basis of analyzing the complicate heat and humid exchange between the outdoor air and the water layer of the roof,the authors obtained a heat transfer model and it's transmit matrix. The temperature and heat flux responses of the internal roof surface is greatly lowered than that of non-water layer roof. It can be concluded that the maintenance of a water layer on the roof is a good way to resist the fluctuation of outdoor temperature and significantly reduce the cooling load of a building.     

Study on Heat Insulation and Use of Passive Evaporated Roof

According to different construction ways and materials, three kinds of roof, that is ,passive evaporated roof with freedom water surface , water stored roof by means of pore material and hygroscopic roof,are introduced in this paper . Meanwhile the theory of heat insulation and energy efficiency on passive evaporation roofs and suitable weather and places to be used are also discussed .The results show that all kinds of passive evaporated roofs have high efficiency in heat insulation because of water's high specific heat and large quantity of absorbed latent heat,and that they can be adopted according to the practical local weather ,natural resource and economical development.     

On the Design of Roof Garden

Building roof garden can widen the green area and expand the green space effectively.It has the ecological function for improving the environment, beautification function for molding a person's sentiment and colorful practical function. It can promote the ecological balance of the city and optimize the environment for human residence to meet the needs of people to approach the nature and return to the nature. In designing roof garden, the favorite factors, such as wide field of vision, good illumination, large temperature difference, little pollution, small people flow as well as adverse factors concerning the field, bearing capacity, soil and wind power should be taken into account. In the meantime, to create an outer ecological space with abundant cultural connotation, it is necessary to take safety as prerequisite, ecology as basis,artistic quality as its core, function as its purpose and economy as its guarantee.     

屋顶农业栽培基质配比的筛选及对生菜生长、品质的影响

本文通过屋顶栽培试验,在保持生长环境相同的条件下,对7种不同配比基质的理化性质及其对生菜生长情况和品质的影响进行了研究,同时运用灰色关联法对各基质的效果进行综合分析。从而为筛选合适的屋顶农业轻质基质提供理论依据。结果表明,各配比处理基质的容重为0.38~0.60g/cm3,总孔隙度为54.77%~74.17%,EC为242~1150 μs/cm,其中花生壳和蘑菇渣的加入可显著降低容重、增加孔隙度,牛粪和草炭对基质养分含量影响最显著;相对于CK,不同配比基质促进了生菜生长,其中T4、T5处理显著提高株高、叶长和干、鲜重;T5对提高生菜的可溶性糖和可溶性固形物含量最为明显。综合各项指标通过灰色关联法分析,T5(V(花生壳):V(牛粪):V(蛭石):V(珍珠岩):V(草炭)=2:2:2:2:2)处理适合屋顶农业中生菜的栽培,效果最好,可以作为屋顶农业中优良的轻质基质配方。     

The Effect of Structure Form on Wind Resistance of Large Cantilevered Roof

On the background of grandstand cantilevered roofs of two aiding foreign stadiums, the wind resistance of two large cantilevered roofs with different structure forms is compared on the basis of pressure data acquired from wind tunnel test of rigid models, according to their models, frequencies, mean wind pressure coefficients and fluctuating wind pressure power spectrum densities. A conclusion is made that the arch on the front edge of the large roof can improve the wind resistance, and is validated by calculating wind induced responses of the two kinds of the large roofs. Finally, several reasons for that the arch on the front edge is beneficial to the wind resistance of the large cantilevered roof are concluded.     

楼顶平台蔬菜水培系统设计及应用效果

在平顶楼房的顶部平台，利用循环水培技术进行蔬菜无土栽培，具有较高的经济效益和社会效益，在南方地区，每年可生产绿叶蔬菜12～16茬，平均每平方米可生产蔬菜52～66kg，每平方米面积创利58元。其栽培关键技术是利用防风墙、防护棚等设施，克服楼房顶部小气候条件变化激烈问题。     

屋顶绿化木本植物的抗旱性研究

为了筛选出适宜屋顶绿化需要的节水抗旱木本植物,在2010年4-6月,以石家庄市的气候条件为基础,测定自然干旱胁迫条件下16种屋顶绿化木本植物的叶片面积、相对含水量、质膜相对透性、可溶性糖含量等指标,综合分析16种木本植物树种的抗旱性。结果表明,柳树、小叶杨、白榆、杠柳抗旱性最强,推荐用于屋顶绿化;金叶女贞、桑树、紫叶小檗、棣棠、红瑞木、珍珠梅、金银木、臭椿、大叶黄杨的抗旱性中等,通过精细管理也可用于屋顶绿化;金叶榆、构树、火炬的抗旱性弱,建议选用时应加强灌溉措施。     

Analysis on Effect of Traffic Loads on Landslide Stability

In the design of landslide control engineering,the effect of traffic loads has not been taken into account.The authors simplified the traffic loads as mobile dead loads and traffic dynamic load.The mobile dead load ranges from 2.34 to 6.41 kPa.The impact coefficient was chosen to denote the traffic dynamic load and ranges from 0.1 to 0.4.Using several stability analysis methods widely accepted by engineers,combining two analysis samples,by the contrast of stability tests with and without consideration of the mobile dead load or the traffic dynamic load,the authors found that when the traffic load is not taken into account,the stability coefficient of shallow layer landslide(<8m) is overrated by 4.3-11 percent or 5.8-12.1 percent in comparison with the case when the mobile dead load or traffic dynamic is taken into account respectively,that is,the influence of mobile dead loads and traffic dynamic load is cannot be neglected.In case of medium deep layer landslide or the road is passing through the anti sliding section,the influence of the traffic load is a little and can be neglected.     

Indoor Temperature of Green Roof in Heat Transfer Critical State

Based on the existing experiment, the heat flux characteristics of green roof in passive indoor thermal environment and thermal parameter suitable for evaluation of the thermal performance of green roof were analyzed. It is found that there is indoor critical temperature in acceptable indoor thermal environment range for green roof, in which there is no heat transfer from roof. Through the correlation analysis of internal surface heat flux of roof and the temperature difference between indoor and outdoor, it is shown that the indoor critical temperature is 1.5℃ lower than air temperature outside for green roof.     

9种轻型屋顶绿化景天属植物的抗旱性研究

为了筛选适宜无养护轻型屋顶绿化的抗旱植物,以胭脂红景天(Sedum spurium ‘Coccineum’)、佛甲草(S. lineare)、金叶佛甲草(S. lineare ‘JinYe’)、八宝景天(S. spectabile ‘Borea’)、松塔景天(S. nicaeense)等9种景天属植物为试验材料,通过光照培养箱模拟屋顶绿化环境进行控水试验,研究干旱胁迫下不同品种叶片含水量、超氧化物歧化酶,(SOD)活性、丙二醛(MDA)含量等抗旱相关生理指标的变化情况,同时观察景天的外部形态变化。结果表明：随着干旱胁迫时间的增加,抗旱性强的品种叶片含水量下降幅度较小,脯氨酸反应不剧烈;除胭脂红景天外,大部分景天品种膜脂过氧化程度较轻,说明景天属植物总体上抗旱性较强。通过隶属函数法综合分析,9种轻型屋顶绿化景天属植物的抗旱性由强至弱的顺序为：佛甲草>八宝景天>垂盆草>宽叶佛甲草>费菜>德景天>松塔景天>金叶佛甲草>胭脂红景天。     

Analysis on the effect of runoff retention and pollution load control for two vegetation roofs during rainfall events

In order to understand the effect of runoff retention and pollution load control for vegetation roofs during rainfall events, the evaluation criterion of vegetation roof performance is redefined and two vegetation roofs are established artificially based on the code for the design of roof greening, which is investigated during rainfall events. Results show that ophiopogon japonicus roof can delay the production of runoff by 25〖XC半字线.tif,JZ〗48 min compared to the rain occurring and retention runoff volume by 40%〖XC半字线.tif,JZ〗58%, while sambucus dhinensis roof can make the generation of runoff 60〖XC半字线.tif,JZ〗130 min later than the rain beginning and runoff volume retention can be as high as 54%〖XC半字线.tif,JZ〗80%. In addition to PO 3-4 P, the reduction of pollution load of NO -2 N, NH3 N, TP, COD, TN and NO -3 N by both vegetation roofs can reach 95.1%〖XC半字线.tif,JZ〗98.6%, 87.2%〖XC半字线.tif,JZ〗93%, 72.4%〖XC半字线.tif,JZ〗83%, 76%〖XC半字线.tif,JZ〗81.8%, 68.7%〖XC半字线.tif,JZ〗78.4% and 40.9%〖XC半字线.tif,JZ〗60.6% respectively. The level of pH, COD, NH3 N and TP in vegetation roofs runoff can meet class Ⅲ surface water standard. Meanwhile, both vegetation roofs have similar effect in neutralization acid deposition (i.e., from 5.8〖XC半字线.tif,JZ〗6.0 (in rain water) to 7.0〖XC半字线.tif,JZ〗7.6 (in eco roof runoff water)). Plants grown on vegetation roofs can influence the performance of vegetation roofs. Based on the results, ophiopogon japonicus has an advantage of sambucus chinensis in controlling phosphorus pollution, while sambucus chinensis manifests better in reducing nitrogen load. Vegetation roofs are becoming an important urban landscape more and more, and study results in this paper provide references for the improvement of vegetation roofs construction and more reasonable evaluation of their running performance.