Wireless sensor network is a new technology that combines short-range wireless communication technology, microelectronic sensors, and embedded systems. It is gradually used in intelligent traffic systems and other related fields that require data collection and detection. The ZigBee technology based on the IEEE 802.15.4 specification has the following good features: 1 Low power consumption, 2 normal 5 cell batteries can support a node for 6 to 24 months; 2 strong network capabilities, the network can reach up to nodes, and Supports a variety of networking methods such as tree, star, and mesh; 3 transmission distance is long, and the distance between two nodes can reach several hundred meters outdoors, and can reach several kilometers after increasing the transmission power; 4 high reliability, with many Level security model; 5 Low cost, open, simplified ZigBee protocol stack, works in the 2.4 GHz license-free ISM band.
The wireless sensor network has excellent characteristics and can provide an effective means for information collection of the intelligent traffic system. It can monitor the vehicles in all directions at intersections, and improves and simplifies and improves signal control algorithms to improve traffic efficiency based on the monitoring results. Wireless sensor networks can be used to implement subsystems such as control subsystems and boot subsystems. For example, the technology can be applied to improve the signal controller and realize the public transportation priority function of the intelligent public transportation system.
The wireless sensor network construction for ITS is shown in Fig. 1. In the wireless sensor network structure, the aggregation nodes on both sides of the installation road form a self-organized multi-hop mesh Mesh basic network architecture, and the dedicated sensor terminal nodes for traffic information collection Each neighboring sink node forms a star network to communicate and the final data will be aggregated to the gateway node. The gateway node can be installed as a module in the traffic signal controller at the intersection. Through the signal controller's proprietary network, the collected data is sent to the traffic control center for further processing.
In the deployment of wireless sensor networks, the convergence nodes can be installed on roadside pillars, bars, and other transportation facilities. The gateway nodes can be integrated in the traffic signal controller at the re-crossing junction. The dedicated sensor terminal nodes can be buried under the road surface or installed in the Roadside, moving vehicles on the road can also install sensor nodes to dynamically join the sensor network.
Characteristics of centrifugal casting of alloy furnace tube:
1, depending on the directional solidification from the outside of the contact with the mold, the quality of extremely dense without casting shrinkage cavity and foreign body clamping is obtained.
2. Central control cylindrical products with uniform thickness can be obtained due to centrifugal force.
3. As there are no factors affecting solidification and shrinkage, products with low casting stress can be obtained.
4. Due to the dense structure and developed columnar crystal of centrifugal casting, it has good oxidation resistance at high temperature, anti-carburization and high temperature strength.
5. It can work continuously for a long time under the temperature of 800-12000c and pressure of 3-4mpa.
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