8 results about "Similarity theory" patented technology

The application relates to a device for quickly determining the rotating speed of a ventilator on a construction site and a use method thereof, and relates to the technical field of ventilator engineering application debugging. The device comprises a hardware main body composed of a controller and a touch display screen, and a control software system with five modules of built-in parameter input, curve fitting, system resistance calculation, target working condition solution and result output. The method is based on the similarity theory of the ventilator, accurately quantifies the pipeline system resistance characteristics through on-site measurement, one-key solves the target running rotating speed, and simultaneously completes the motor adaptability determination and the belt pulley transmission ratio recommendation. The application does not need to transform the original control system of the ventilator, can complete the on-site debugging offline, greatly improves the rotating speed calculation precision, realizes the standard reaching after the replacement of the belt pulley once, and significantly shortens the debugging period and reduces the engineering cost.

This invention provides a dynamic load similarity model test system and related methods and equipment, belonging to the field of civil engineering testing technology. The system includes: a box frame structure, a pavement-underpass tunnel similarity model, a vibrator module, and a data monitoring and acquisition module. The pavement-underpass tunnel similarity model is constructed from similar materials within the box frame structure based on similarity theory. The vibrator module is used to simulate and apply dynamic loads on the pavement and / or vibration loads from the underpass tunnel. The data monitoring and acquisition module is used to collect dynamic response data of the structure under the relevant loads and load value information of the two types of loads. This invention can provide a reliable physical test verification method for studying the dynamic response characteristics of pavement structures and underpass tunnel structures under the coupled influence of pavement dynamic loads and underpass tunnel vibration loads, while taking into account ease of implementation and cost.

This invention discloses a scaled-down model simulation system and method for oil-immersed transformers based on similarity theory, comprising: S1 determining the transformer model and structural parameters required for multiphysics analysis, as well as the similarity ratio of the scaled-down model for simulating physical phenomena; S2 determining the eddy current field control equations adapted to the transformer's electromagnetic field using Maxwell's equations, and deriving the eddy current field similarity criterion based on similarity theory; S3 determining the energy conservation similarity criterion based on the energy conservation equation; S4 determining the momentum conservation similarity criterion based on the momentum conservation equation; S5 determining the convective heat transfer similarity criterion based on convective heat transfer boundary conditions; S6 determining the heat flow compensation principle by integrating various similarity criteria, performing temperature-fluid field simulation, and comparing the simulation results with those of the original structural model and prototype experimental results. This invention is computationally simple, highly accurate, and efficient, and can be well applied to engineering practice.

The invention discloses an optical turbulence transferable feature construction method under heterogeneous observation conditions, and belongs to the technical field of atmospheric optics, boundary layer meteorology and data driving prediction. The method comprises the following steps: firstly, preprocessing heterogeneous observation data to obtain an effective observation sequence meeting a construction condition; secondly, introducing a unified reference height mapping item and a stability bounded correction item into a Monin-Obukhov similarity theory framework, constraining a measurement height item and the stability correction item, and constructing an optical turbulence characterization quantity; then isomorphic re-parameterization is carried out on the effective observation sequence according to constituent variables and a function relation of the optical turbulence characterization quantity, and transferable features with unified physical significance are generated; and finally, carrying out time sequence expansion on the transferable features to form a transferable feature set to be called by a future optical turbulence characterization quantity prediction model of the target scene. According to the method, feature space offset among different observation conditions can be reduced, and feature physical interpretability and migration consistency are improved.

This invention discloses a method for constructing a digital twin model of a core engine rotor based on dynamic similarity, relating to the field of aero-engine condition monitoring technology. The method includes: establishing the dynamic equations of the prototype rotor based on the structural parameters and dynamic characteristics of the prototype core engine rotor system; determining the similarity relationship between the prototype rotor and a similar rotor based on dynamic similarity theory; determining the design parameters of the similar rotor based on the similarity relationship; and constructing the similar rotor based on the design parameters. This invention obtains time-domain characteristic response vectors by collecting and processing the dynamic response data of the similar rotor, capturing its dynamic characteristics; constructing a dynamic similarity mapping operator to realize the feature transformation between the similar rotor and the prototype rotor, alleviating the constraint of limited accuracy in finite element modeling; and inputting the prototype rotor features into the digital twin model to drive its update and reconstruction, achieving high-fidelity deduction of the internal state of the core engine rotor and improving the accuracy and reliability of its dynamic characteristic analysis.

The present application relates to a kind of laboratory simulation test methods of collapse zone grouting filling roof reconstruction effect, belong to coal mining and strata control technical field.The method solves the problem that it is difficult to scientifically, quantitatively predict and evaluate the mechanical properties of grouting roof reconstruction in prior art.The technical scheme is as follows: obtain the block size characteristic parameters of field collapse rock mass by numerical simulation, determine the experimental scale ratio based on similarity theory, simulate the grouting cementation process under overburden stress in special device, and finally drill core sample to test its physical and mechanical parameters.The method realizes controllable, measurable laboratory evaluation of reconstruction effect, can provide direct basis for optimizing process parameters, reducing engineering cost and risk, and promote the resource utilization of coal-based solid waste.

The application relates to a device for quickly determining the rotating speed of a ventilator on a construction site and a use method thereof, and relates to the technical field of ventilator engineering application debugging. The device comprises a hardware main body composed of a controller and a touch display screen, and a control software system with five modules of built-in parameter input, curve fitting, system resistance calculation, target working condition solution and result output. The method is based on the similarity theory of the ventilator, accurately quantifies the pipeline system resistance characteristics through on-site measurement, one-key solves the target running rotating speed, and simultaneously completes the motor adaptability determination and the belt pulley transmission ratio recommendation. The application does not need to transform the original control system of the ventilator, can complete the on-site debugging offline, greatly improves the rotating speed calculation precision, realizes the standard reaching after the replacement of the belt pulley once, and significantly shortens the debugging period and reduces the engineering cost.

The application discloses a displacement simulation method for opening and closing of a storage space and a seepage channel, and the displacement simulation method comprises the following steps: establishing a volcanic rock fracture and cave type oil reservoir physical model parameter by using a similarity theory; determining crude oil viscosity μ o and injection speed q o according to dynamic and motion similarity criteria parameters; obtaining crude oil volume V 总 ; recording injection end pressure P j and production end pressure P e according to the injection speed; calculating a crude oil recovery rate γ 衰竭 of a depletion development; calculating a crude oil recovery rate γ 注水 of a water injection development; and calculating a crude oil recovery rate γ 注气 of a gas injection development. Key parameters of the physical model can be determined according to the characteristics of a field fracture and cave type oil reservoir, and the physical model is better applied to physical simulation to reduce errors between the physical simulation and a mine field test.