Natural aeration method capable of avoiding ship lock valve segment sudden shape type drop sill cavitation

Process combined approval method applied to ERP (enterprise resource planning) system and approval management system

The invention discloses a process combined approval method applied to an ERP (enterprise resource planning) system and an approval management system. The method includes: creating approval processes for all operating conditions, numbering the approval processes and storing the approval processes; when receiving a work ticket adding instruction, generating a work ticket; finding out numbers of the approval processes corresponding to the operating conditions according to the operating conditions selected in the work ticket; when the selected operating conditions in the work ticket have two or more kinds, combining the approval processes of all the operating conditions, and adopting the numbers of the operating conditions with the widest approval range; executing the approval processes according to the numbers. The approval processes of all the working conditions are combined to ensure that one work ticket only has one approval process. Besides, the numbers of the operating conditions with ...

Rapid judgment method for river evolution directivity

The invention relates to the technical field of river channel evolution discrimination, in particular to a quick discrimination method for river channel evolution directivity, and aims to solve the problem that upstream and downstream damming and water falling, the transverse gradient change rule of the water surface of an engineering control and guide curve and the like are not very clear. In order to solve the problem that the water flow energy consumption rate and the energy consumption distribution rule in the construction period of the control and guide project and the threshold condition that the evolution of the project control and guide curve is relatively slow are not clear, the invention provides a rapid judgment method for the river evolution directivity. Calculating on-way resistance loss; calculating local resistance loss; calculating an engineering boundary water flow energy consumption rate; analyzing energy consumption rate distribution; by judging the influence of the construction ...

Natural aeration system capable of avoiding ship lock valve segment sudden enlarging body type ridge dropping cavitation

The invention pertains to the technical field of water conservancy and relates to a natural ventilation method which can reduce the cavitation of a suddenly-expanded drop sill of a valve section of a navigation lock. The method is characterized in that the drop sill adopts a step shape and takes a starting point of an original drop sill as the starting point of a first step of a step-shaped drop sill; after a level surface the first step of the step-shaped drop sill is connected with the second step through a downward curved face; a location where a water flow of the step-shaped drop sill separates is provided with a ventilation system for natural ventilation. By adopting the optimized step-shaped drop sill and the reasonable pipeline distribution, the natural ventilation can be realized in the drop sill; an aeration water flow effectively protects the area where the water flow of the original vertical drop sill separates and covers the cavitation collapsed area of the original drop sill ...