Abstract: The topology of network affects the load balancing and service lifetime of the sensor nodes. Clustering is an effective pattern of topology management for wireless sensor networks. According to the distribution characteristics of the vascular paths and inspirations to topology for wireless sensor networks,a non-uniform hierarchical clustering algorithm was presented. First we studied the structural characteristics of the vascular network, then etabalished the mathematical model and network topology. The nodes with different pressure values in wireless sensor networks are hierarchically marked and statically clustered with non-uniform probability based on the improved particle swarm optimization. So the non-uniform hierarchical clustering topology is established with different scale and quantity of clusters in different hierarchy area. Simulation shows that the algorithm can optimize the network clustering, balance the nodes' energy consumption. It also lengthens service lifetime and avoids the hot issue in the energy consumption of network.

Key words: Wireless sensor networks, Topology, Hierarchical clustering, Non-uniform, Particle swarm optimal