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The mismatched errors of the anti-backlash double-roller enveloping hourglass worm (ADEHW) plays a very critical role on its performance, but the influence of errors on ADEHW are rarely reported in available literatures, and the most important thing that we concerned is how to acquire the meshing equation and generate the tooth profile of ADEHW involving errors. Therefore, the new anti-backlash double-roller enveloping hourglass worm tooth profile equation which involved the grinding wheel radius, angular position error of the worm wheel axis, the centre distance errors and the shaft angle was established for the first time in order to study the effects of worm parameters on the worm tooth profile by using the theories of differential geometry and gear meshing. A new method to acquire the contact line of worm was presented by using the corresponding computer program and dichotomy. The real tooth surface was acquired based on the Pro/E software using the contact helix line equation and the three-dimension (3D) geological modeling of the Anti-backlash double-roller enveloping hourglass worm was established. The results obtained show that the formula established of worm tooth profile is important to analysis the characters of gearing mesh and parameter.

Olympic Games in 2008 is not only a world sports event, but also a great opportunity to show our current level of economic development and modern science and technology strength. Precision water-saving irrigation automatic control system by plant physiology this paper described is one of the Olympic Games facilities projects, which takes standards of water plant physiologically need and soil water content as the basis, Through the combination of independent research and development of irrigation monitoring controller and wireless data transmission , implement a drip irrigation, sprinkler irrigation, micro-irrigation, and low-pressure pipelines, such as different modes of irrigation automatic control. On this basis, the system monitors by GSM remote wireless communication make all irrigation incidents automatically enter into the database, and generate a variety of reports to the irrigation data for statistical analysis. This paper describes system structure on two aspects of hardware and software design, it is characterized by a flexible mode of operation, reliable control and data transmission, low-cost, remarkable water-saving effect. National Road precision water-saving irrigation project's preliminary trial implies that this new type of precision water-saving irrigation control system with independent intellectual property rights has a higher value for promotion.