A New Multi
Abstract: In recent years a number of proposed bridge monitoring systems such as wireless sensor network based bridge monitoring system, based on polling of the fragmented state of multi-point bridge monitoring system for use with the kind of technology to build large-scale fragmented state monitoring system But for a different bridge monitoring technology or with the existing bridge monitoring systems are still serious problems of compatibility, operability weak. Bridge monitoring system introduced in the soft Communicate Platform, using a variety of software communications platform to bridge the existing monitoring site to provide the system interfaces of different technologies and unified communications platform, enabling a variety of different subsystems of the distributed bridge monitoring on-site and remote access to centralized control, it is a feasible technical way.
Bridge monitoring system uses the existing monitoring methods include use of mobile GSM network to connect the bridge monitoring approach and use of fiber optic cable to connect the bridge monitoring mode [1]. Both methods are based on the dedicated transmission channel, the implementation of point of collection and control. Therefore, in accordance with the two monitoring methods to establish the bridge monitoring systems are a single dedicated system that is only a monitoring system for monitoring a particular bridge, could not form a large monitoring network. In recent years, works in theory also proposed some new bridge monitoring methods, such as wireless sensor network based bridge monitoring system [2-3], based on polling of the fragmented state of multi-point bridge monitoring system [4], etc., these methods applied using the same kind of technology to build large-scale fragmented state monitoring system, but for a different bridge monitoring technology or with the existing bridge monitoring systems are still serious problems of compatibility, operability weak. In addition, the existing bridge monitoring systems are basically used a different network equipment, monitoring technology and network structure, which not only requires a lot of manpower, material, maintenance management, there are big difficulties, statistical analysis and monitoring of exchange of experience is also very unfavorable. Over the entire city or region to achieve the distributed remote monitoring bridge help reduce costs and improve the efficiency and capacity control, so its study is necessary. However, based on existing monitoring systems of various bridges of different technical interfaces, direct Internet, or hardware devices connected by a high difficulty, cost of large soft-level from a bridge monitor the site to achieve a variety of loosely coupled distributed system, remote monitoring is a feasible solution.
1 existing bridge monitoring Existing bridge monitoring systems used to monitor the most traditional manual method except for data measurement, recording and treatment, mainly in two ways: using mobile GSM network to connect the bridge monitoring approach and use of fiber optic cable connection bridge monitoring approach. GSM connections by way of the bridge to monitor the use of GSM voice channel to establish point to point data transmission channel, by monitoring the central computer control of the bridge were all collected data acquisition instrument. This method, the same set of data center equipment can only be collected at the same time, a bridge or a collection apparatus connected Sensor Data. And equipment on the bus on the way of control is the control point, so data collection is slow, tedious operation. Method of data transmission for mobile networks based on dedicated channels, the high cost, inconvenient to use. Use cable to connect the bridge monitoring approach, in fact, applies a special cable or fiber optic cable instead of leased telecommunications utility in the way the first one kind of mobile GSM network to the middle of the transmission network more reliable and higher data rates. But still the point of collection and control method uses an additional high cost of optical network equipment, maintenance is difficult to monitor the center and fixed, difficult to set up large-scale monitoring network.
Can be seen that in accordance with the above two monitoring methods to establish the bridge monitoring systems are a single dedicated system that is only a monitoring system to monitor a particular bridge, could not form a large monitoring network.
In recent years, theoretical work has proposed a new method of bridge monitoring, the core idea of this approach: each monitoring point of intelligent control unit through the data transmission unit and the communication base station access to GPRS or CDMA network , connected to the Internet, and then monitoring center through a router to connect a computer [4]. Through this network connection, the monitoring center computer can be asynchronous with the number of monitoring points simultaneously establish a data transmission connection, to achieve multi-point monitoring and control. While monitoring the data center computer processing unit multi-threaded approach to achieve multi-tasking data acquisition and data processing. Scattered distribution in the bridge, the use of this new monitoring method, if more bridges with the same networking equipment and technology to form a new large-scale monitoring network, the monitoring of multi bridges, or only theoretically possible and the reason is: The formation of this new monitoring method under scattered over a large bridges monitoring system, the use of a collection system for the uplink multiple physical interfaces or communication protocols are different, the intelligent control unit requires a variety of different The acquisition instrument for adaptation and communication protocol physical interface adapter; Similarly, the intelligent control unit of the uplink physical interface and communication protocol different from the requested data transmission unit down with different physical interfaces and communication protocols, while both the uplink data transfer unit is a unified access GPRS or CDMA network interface and communication protocols. Practice, requires a variety of data transmission unit is very difficult, so this case can not be implemented in this way.
2 soft-level design ideas From the soft aspects of the bridge to monitor the scene of multiple different data transfer between subsystems, transport and communications, the typical approach is to set up a public communications network communications software platform, the software communication platform of the adaptation of various subsystems interface, protocol conversion, and remote data transmission. This software platform, communication platform, also known as software bus, Figure 1 shows the soft bus bridge monitoring system architecture as a viable platform.
Software bus platform, including hardware interface module, the kernel and application software bus interface unit. Hardware interface modules include a variety of hardware interface drivers to receive data from external hardware software bus sent to the above core modules, and software bus from the core modules described in the operation of receiving an order sent to external hardware. Multi-threaded software bus core, including task scheduling, message queue processing function units, from the hardware interface unit receives the data sent to the application interface unit, and from the upper interface unit to receive the operation command sent to the hardware interface unit. Application provides the external interface unit to monitor human-machine interface of the bridge above the soft bus access interface units, from soft core to receive data bus to send to an external bridge
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