Mesh

Mesh network namely "wireless Mesh network", it is a wireless network, is more than by AD jump, evolved hoc network is solving "the last kilometer" problem of key technical one. In the process of evolution as a next-generation network, wireless is an indispensable technology. Wireless mesh network with other collaborative communication can be. Is a dynamic can expanding network architecture, any two equipment are can keep wireless Internet.

introduction

Mesh WLAN network than one hop network more stable, this is because in data communication, network performance play and not rely on a node. In traditional one hop wireless network, if the fault occurred in the AP fixed, then the network all wireless equipment can communicate in Mesh network. And, if a node fault occurred in the AP, it can choose a AP again, data can still communicate destination. High speed from physics perspective, wireless communication means communication distance of the shorter, the better communication effect will be. Because as communication distance growth, wireless signals will not only weak and mutual interference, so as to reduce the efficiency of data communication in Mesh network. And, in a shorter wireless network connection instead of past, so as to ensure long connection with high speed data will be between the nodes. Rapid transfer Mesh technology can make the WLAN installation deployment, network expansion and more convenient. Many manufacturers are launched feature-rich Mesh products, thus make deploy large-scale carrier-grade wireless intracity networks become possible. (specific Mesh technology says can reference related manufacturers of technical document.) such as: Strix developed the DMA protocol (Strix Dynamic Architecture Mesh ™, Dynamic Mesh structure), make wireless access points with automatic configuration, and make the network efficiency network optimization properties. Provide self organization, repair itself, update Dynamic network connection, and ensure safety etc function.

Wireless mesh network (WMN) technology is based on IP access for new wireless mobile communication technology, suitable for the regional environmental coverage and broadband high-speed wireless access. Wireless Mesh network based on the distribution of numerous reticulation wireless access point mutual cooperation and coordination, have broadband high speed and high frequency spectrum efficiency advantage, has the dynamic self-organizing, since configuration, since such prominent characteristics, thus maintaining wireless Mesh technology and network, the research development and application, become the hot topic wireless mobile communication, especially in the future of mobile communication system long-term evolution (LTE), wireless Mesh technology and network become attention focus.

significance

Mesh in finite element method of significance for "points unit". Namely research objects taken apart into a finite element of each geometry geometry and each node force and deformation analysis, wrote the partial differential equations, and finally put all the unit nodes partial differential equations contact, the generation into load and boundary constraint condition, by functional analysis method. Decomposition unit can according to objects into

Beam model objects: beam element, 2 nodes

Curved surface, sliced, sheet metal, shell: shell element, 4-5 node

Entities: tetrahedron unit 4-5 node (analytical error is bigger, easily convergence, many CAE software step can be completed units classification and unit - node modification), or hexahedron units, 8-21 nodes (precise but easily not convergence and difficult) divided unit. The significance of Mesh in reverse modeling for by a Point Cloud Point Cloud) data generation (small triangle geometry Body), the latter (facet can be directly used for various rapid prototyping (Prototype).

Through three coordinates measuring instrument or CT slices way to get complicated appearance products such as the point cluster, generating surface. ASCII,. Taking landuse-dat etc (X, Y, Z format) text data, is the point cloud.

application

MESH technology in the meaning of coal industry

For construction of modern mine, mine, various local digital technology companies with this goal in efforts to develop technology WIFI. Based on the wireless communication system used in coal mine has come into use. Including the use of the MESH technology communication systems, such as KT109R etc.

In coal mine underground complex harsh environments, the conventional communication technology such as landslide, often affected by the circumstances such as power beset in wireless communication system, if use the MESH technology, even communications cable damage every communication stations, downhole between communicate MESH technology still available for mine. The move also provides a reliable emergency rescue the platform.