3results about How to "Good fluid performance" patented technology

A multi-objective optimization method for a two-dimensional pump damping groove based on a GA-BP neural network includes the following steps: S1, establishing design variable parameters in the two-dimensional pump damping groove structure; S2, constructing a simulation model of a two-dimensional piston pump and using this model to simulate and obtain the performance parameters of the hydraulic pump; S3, constructing a GA-BP surrogate model, the process of which is as follows: S31, generating a sample dataset with good parameter space filling performance using Latin hypersquare sampling based on the design variable parameters; S32, establishing a BP neural network model and using a genetic algorithm to optimize and train the model based on the sample dataset, finally obtaining a BP neural network model optimized by the genetic algorithm; S4, using the GA-BP neural network surrogate model as the fitness function, performing multi-objective optimization of the damping groove structure parameter space using a fast non-dominated sorting genetic algorithm to obtain the optimal parameter solution set. This invention significantly improves the comprehensive fluid performance of two-dimensional pumps.

The utility model discloses a kind of PCB motor and its micro fan based on LDS, and PCB motor based on LDS includes LDS base and PCB coil board, and the surface of LDS base is equipped with the metal circuit formed by LDS technology. Reasonably replace the way of winding stator coil of traditional enameled copper wire with PCB coil board, i. e. directly printing stator coil on PCB board, can greatly reduce the volume and occupied space of stator coil, and PCB coil board is directly welded on LDS base, further simplifies structure, reduces the number of components. Integrate the overall structure of micro fan into PCB motor based on LDS, utilize the wiring flexibility of LDS base, effectively optimize overall structure layout, without occupying fluid space inside micro fan, make micro fan more compact and light. In addition, external or built-in drive circuit module structure design can also be selected, to meet different use requirements.

The utility model discloses a torsion type pipeline water turbine damping grid position adjusting mechanism which comprises a conveying pipeline, a sliding groove module and a movable damping grid. A guide through groove is formed in the conveying pipeline and extends in the conveying direction of the conveying pipeline. The sliding groove module is arranged outside the conveying pipeline, the interior of the sliding groove module is communicated with the guide through groove, a variable-pitch spring is arranged in the sliding groove module, and the telescopic direction of the variable-pitch spring is consistent with the extending arrangement direction of the guide through groove; the movable damping screen is arranged in the conveying pipeline in a sliding mode and provided with a connecting rod and a sliding block. One end of the connecting rod penetrates through the guide through groove and then is connected with a sliding block; the sliding block is fixedly connected with one end of a variable pitch spring; when the movable damping screen is scoured by fluid, the variable-pitch spring provides resistance for the movable damping screen so that the movable damping screen can move to the stress balance position. After the scheme is adopted, the self-adaptive adjustment of the position of the rectifying grid can be realized.