Intelligent overall solution of the hottest traffi

2022-08-12
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With the healthy development of people's income and the development of the western region, the process of urbanization in China is gradually accelerating. With the acceleration of urbanization, the intellectualization of high-rise buildings has become another new highlight in the field of automatic control. However, from the beginning of China's involvement in the building intelligence industry to now, nearly 80% of the domestic high-rise building intelligence projects use foreign monitoring configuration software as the upper platform. There are two main reasons: first, foreign software (such as excel5000, WinCC, etc.) takes longer to use than domestic software, and its stability and function are better than domestic software; Second, foreign software has its own hardware integration products, and its software and hardware can be well combined. However, there is a risk of high investment in the intelligent engineering of buildings (generally accounting for about 5% of the civil engineering cost). Therefore, domestic software is rarely used in the intelligent engineering of high-rise buildings. But in fact, because the intelligent building system belongs to a lagging system, the control accuracy is not as high as that of process control. Considering the project cost, Wanhe Intelligent Engineering Technology Co., Ltd. proposed the following solutions to the developers after reaching a consensus with the developers to use domestic software and hardware to build domestic intelligent building projects

the transportation building in this case analysis is located in the center of a city in Guangdong Province, with a 24 storey building height and a construction area of 40000 square meters. There are three storey podium buildings on both sides of the main building, and the main body of the building is a central symmetrical structure. Its traffic command center is located on the top floor, with offices on the 5th to 23rd floors, restaurants on the 4th floor, and a centralized business hall for certificate processing on the 1st to 3rd floors. The underground is divided into three layers; The first floor is the underground parking lot with 260 parking spaces, the second floor is the electromechanical equipment room, the third floor is the wartime air defense station, and it is the sundry storage room in peacetime

main functions of the transportation building: centralized management of the number of motor vehicles in the urban area; Carry out unified dispatching and management on the road sections where major traffic failures and vehicle peak hours occur

first, the system integration mode of transportation building

there is no unified conclusion about the integration of the whole intelligent building in China. At present, the BMS system integration of large public buildings mainly adopts the following four modes: (1) system integration in the form of contact; (2) Integration by serial communication; (3) Take the building automation system ba as the platform for system integration; (4) System integration based on subsystem equality. The first integration method is the initial means of system integration, which is rarely used in BMS integration now; The second method is too slow in communication speed due to serial communication; The third integration method has great defects. BAS system is a relatively closed system, which lacks the ability to open up. The interface equipment and interface software with other subsystems are limited to specific products, so the system integration ability is limited, and the maintenance and upgrade costs are too high. The binding between bas and BMS is too tight. Once bas fails, BMS will also be paralyzed, lose its normal working ability, and cannot manage and monitor the subsystems that are still working normally

according to the user's requirements and the five principles of system integration, Wanhe Intelligent Engineering Technology Co., Ltd. adopts an integration method based on subsystem equality. The whole transportation building can be integrated into a parallel two-tier structure according to the functional requirements put forward by users. The integrated business information management automation system is composed of an integrated communication platform composed of OA and CN of the transportation building, traffic information communication, alarm system, etc. (MAS); The building management system (BMS) based on building property management is composed of building management related systems such as Ba, FA, SA, etc. In the integrated system, the five subsystems of OA and the six subsystems of CN are coordinated and managed by MAS, and the seven subsystems of Ba and the property management network are managed by BMS. Their databases can be interconnected according to permissions and needs

the company is preparing to improve this threshold again. Secondly, the wiring system of the transportation building

the MAS system in the whole building adopts the generic cabling system as the subsystem of the transmission medium (super class 5 and class 6 hybrid cabling structure)

(I) according to the analysis of user needs

the intelligent system of transportation building mainly includes: power distribution equipment monitoring, electromechanical equipment monitoring, fire alarm, cable television, security automation, broadcast sound, information communication and computer network and other subsystems. Theoretically, generic cabling can support the signal transmission of the above subsystems, covering almost all weak current systems. However, in practical application, the backbone topology of the equipment monitoring system is generally the bus line, while the generic cabling is the star topology. If the generic cabling is used in the system, the length of twisted pair will be increased a lot; The cable TV system can transmit RF signals by using optical cables, but the system reliability will be reduced by adding adapters, and its investment is also more expensive than coaxial cables; If UTP is used for video signal transmission in closed-circuit television monitoring system, its shielding performance is worse than that of coaxial cable. If FTP is used, its price is higher than that of coaxial cable, and the power line should also be laid separately; The fire alarm system is mainly bus structure, which also has the above reasons. At present, the relevant specifications stipulate that the fire alarm line cannot be shared and laid with other lines, and it is not suitable to use generic cabling due to the management system; The output voltage of the broadcast sound system is 70V ~ 120V. If generic cabling is used, there will be cable overvoltage. This part of the system is not suitable for generic cabling. Therefore, the most suitable system for using generic cabling transmission medium is MAS (communication and computer network system)

(II) generic cabling design level

generic cabling design level is divided into basic type, enhanced type and integrated type. In combination with users' needs for voice and data equipment, and considering the development in the next 10 to 15 years, the building adopts a comprehensive design grade, using a mixed group of optical cables and UTP

(III) design scheme of horizontal working area and connecting equipment between devices

scheme 1: select super five categories of products, which can support the requirements of 100Mbps Ethernet and 1Gbps Ethernet, and support the needs of 550MHz broadband video transmission to the desktop, and provide convenience for future upgrading. Since the bottleneck of data transmission mainly lies in data sharing equipment and network switching equipment, the connection equipment between horizontal work areas and management rooms adopts more than five categories of products. In addition, a small number of optical fiber to desktop information points are set in each floor, which are mainly distributed in the comprehensive conference room, command center, network center and key offices. This scheme is very suitable for those systems that want to invest the least but ensure user performance at the same time, that is, where network cost is more important than network bandwidth

scheme 2: select six types of products with better transmission quality, such as wider transmission band and faster transmission speed, and also set a small amount of optical fiber to desktop information points in each floor. The bandwidth and transmission rate of category 6 cabling are much higher than those of category 5 Cabling (it can support the application of 1.2g/2.4gbps ATM and 1.0gbps Gigabit Ethernet, and the data transmission rate is 5 ~ 6 times faster than that of category 5 Cabling). Category VI cabling is used together with the vertical trunk line based on optical fiber media to provide a complete end-to-end cabling solution for high bandwidth applications. It is highly advanced, especially suitable for the expansion and upgrading of future networks, reducing maintenance costs, but the disadvantage is that the price is high. The investment of this scheme is 35% more than that of scheme I, with an increase of about 1.8 million yuan

after further discussion with Party A on the actual demand and project cost, the super class 5 and class 6 hybrid wiring structure is adopted in this system

(IV) data vertical trunk scheme

due to the use of network switches with fast speed on each floor, these increasing network loads exceed the capacity range of large logarithmic twisted pair. In order to support Gigabit Ethernet and higher data rate applications in the future, data vertical trunk adopts multimode optical fiber. Multimode fiber has high optical coupling rate and relatively loose core alignment requirements; When the bending radius is greater than 10 times its diameter, it will not affect the signal transmission. It is a backbone transmission cable that conforms to ieee802.5 FDDI and eia/tia 568 standards; It can support computer networks with a transmission distance of more than 100m in the building and high-speed network transmission applications requiring high bandwidth, so as to ensure the current and future network system requirements

voice system: Although the voice system is not only a traditional service, but also ISDN and other services, the use of super five types of large logarithm copper cable can fully meet the requirements of communication technology in the next 10-15 years. Therefore, the voice vertical trunk adopts super five categories of large logarithm copper cables

(V) information point configuration

information point configuration is mainly determined according to the generic cabling design specification, the owner's requirements for voice and data terminal equipment, and considering a certain amount of information point reservation

referring to the use of generic cabling information points in some domestic traffic management buildings, there are 5-6 information points/10m2 in the office building of the command center and the office hall on the first to third floors, 7-8 information points/10m2 in the network center, and 3-4 information points/10m2 in the general office space. For the areas in the building that are not currently used, they are set according to the basic type and enhanced type according to their specific locations. There are about 5896 information points in this building. Among them, there are 2531 voice points, 3365 data points and 156 optical fiber to desktop points

(VI) main equipment configuration

at present, there are many models of generic cabling products produced at home and abroad, which are mainly divided into three factions: products from Europe, North America, mainland China and Taiwan. Party a selected the products of Simon company of the United States from the equipment recommended by Wanhe Intelligent Engineering Technology Co., Ltd

the specific configuration is as follows: the voice system and data system in each work area subsystem adopt six types of information modules, which can be used in the network environment with a transmission rate of 100MHz. The purpose of using six types of information modules in the voice system and data system is that the two systems can backup each other, which improves the flexibility and scalability of the system; In the horizontal subsystem, the data system and voice system adopt 6-class 4-Pair twisted pair cables, and the optical fiber to the desktop information point adopts 8-core multimode optical fiber (two of which are standby); In the vertical subsystem, the voice backbone adopts 50 pairs of super five category large logarithmic cables, and the data backbone adopts 24 core multimode fiber; The management subsystem mainly adopts the cabinet installation mode, that is, the voice distribution frame and data distribution frame are placed in the 19 inch standard cabinet (the voice system adopts the cabinet distribution frame, the data system adopts the optical fiber distribution box for the termination of the trunk wiring, and the 24 port category 6 distribution frame is used for the termination of the horizontal wiring)

(VII) optical fiber monitoring

card type OTDR instrument and optical power meter are used in the optical fiber monitoring of this project. When the output optical power of the tested optical fiber is too strong to affect the test results, the optical attenuator (such as db-2900) is automatically connected in the optical fiber test link to obtain accurate test results

the optical power meter of the monitoring station monitors and collects the optical power of the measured optical fiber, and transmits the collected data to the optical power control unit. The optical power control unit compares and analyzes the monitored optical power data, and transmits the optical power data exceeding the alarm threshold to the monitoring center. The monitoring center compares, analyzes and counts the data transmitted by each optical power meter, alarms and counts the optical power changes beyond the threshold, judges the faulty light segment, and automatically and quickly starts the optical time domain reflectometer (OTDR) and program-controlled switch (OSW) of the monitoring station to test the faulty optical cable,

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