4 results about "Scale separation" patented technology

A control method for vehicle magnetorheological suspension based on dual-timescale separation includes: establishing an equivalent drive circuit model with time delay; separating the equivalent drive circuit model into two timescales based on singular perturbation theory to construct a fast-changing current subsystem and a slow-changing control subsystem; designing a slow-changing control subsystem controller for the slow-changing control subsystem, calculating the reference current output by the slow-changing control subsystem, and then outputting the reference current to the fast-changing current subsystem; designing a fast-changing current subsystem controller for the fast-changing current subsystem, designing a Smith predictor to compensate for the time delay, and calculating the compensated duty cycle output by the fast-changing current subsystem by combining the reference current and the non-singular reaching law; and outputting the compensated duty cycle to the equivalent drive circuit model to achieve real-time control of the magnetorheological suspension. This invention can effectively handle the multi-source time delay problem of magnetorheological suspension in two timescales, improving vehicle ride comfort and handling stability.

This invention discloses a simulation calculation method for macro- and micro-scale coupled pollution at coal material induced airflow transfer points, comprising the following steps: S1: Constructing a three-dimensional model of an open underground transfer point and a flow field calculation grid; S2: Establishing a macro- and micro-scale separation strategy for solid materials; S3: Calculating macroscopic coal flow motion and spatial porosity based on the discrete element method; S4: Calculating fine dust diffusion based on a fluid dynamics discrete phase model; S5: Performing asynchronous coupled calculations of fluid and discrete element methods, which can avoid simulation result distortion and the problem of coupled simulation easily leading to grids exceeding 100 million and calculation divergence.

The invention provides a sea surface height abnormal data fusion method and device, and relates to the technical field of ocean data processing. According to the method, flattening processing is carried out on wide-swath two-dimensional sea surface height abnormal data, so that the wide-swath two-dimensional sea surface height abnormal data can be fused with along-rail sea surface height abnormal data under a unified framework; the method comprises the following steps: flattening one-dimensional data, performing scale separation on the flattened one-dimensional data, fusing different scale components by adopting an optimal interpolation method based on space-time, compensating a fusion result corresponding to a second scale by utilizing a trained compensation model, and finally reconstructing fusion results obtained under different scales to obtain a fusion result. Therefore, large-scale background information and sub-mesoscale detail information can be processed separately and reconstructed cooperatively, and the problem that a small-scale structure is easy to be smoothed excessively due to mutual coupling of different-scale information in an existing unified fusion mode is solved. The obtained target sea surface height anomaly fusion data can well consider the stability of a background field and the recovery capability of a fine structure.

The application discloses a simulation calculation method for macro-micro coupling pollution of a coal mine material induced airflow transfer point, and comprises the following steps: S1, constructing an underground open transfer point three-dimensional model and a flow field calculation grid; S2, establishing a macro-micro scale separation strategy of a solid phase material; S3, calculating macroscopic coal flow movement and spatial porosity based on a discrete element method; S4, calculating micro-fine dust diffusion based on a fluid mechanics discrete phase model; and S5, performing asynchronous coupling calculation of a fluid and a discrete element, so that the problems of simulation result distortion and grid over one hundred million and calculation divergence caused by coupling simulation can be avoided.