Modelica-based hydraulic excavator energy transfer precise model construction method

Abstract

The invention discloses a Modelica-based hydraulic excavator energy transfer precise model construction method, which comprises the following steps: firstly, decomposing an excavator energy transfer system to obtain a system model, a subsystem model, a component model and an element model; then, constructing component models, and packaging the component models into a component model library, wherein the component model library and the component model library form subsystem models; establishing a hydraulic excavator energy transfer system model for the subsystem model; then carrying out a component bench test, obtaining correction parameters of a key model based on the bench test; and finally, carrying out in-service operation data acquisition and characteristic parameter extraction, fusing bench test data and in-service operation data, carrying out system-level model correction and verification by adopting an optimization algorithm, and constructing a hydraulic excavator energy transfer precise model. The energy transfer model constructed by the method has layering, reusability and expandability, and the modeling efficiency is greatly improved; and the energy transfer relation can be reflected more accurately and truly, and energy consumption analysis, energy conservation and consumption reduction of the hydraulic excavator are facilitated.

Description

technical field [0001] The invention relates to the technical field of hydraulic excavator system modeling, in particular to a Modelica-based method for constructing an accurate model of hydraulic excavator energy transfer. Background technique [0002] An excavator is a kind of construction machinery that performs excavation, loading and leveling operations intermittently or continuously in a certain order. It is widely used in earthwork construction such as industrial and civil buildings, road construction and municipal engineering, and occupies an important position in construction machinery. Therefore, it is particularly important to carry out energy transfer simulation analysis and optimal control of hydraulic excavators. Since the hydraulic excavator is a very complex construction machine, which involves knowledge in many fields such as machinery, hydraulic pressure and control, the existing modeling and simulation methods usually use different software platforms to mo...

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Problems solved by technology

In addition, in order to realize the multi-domain co-simulation of excavator machinery, hydraulic pressure and control, the models established based on the above single-domain simulation software need to provide the mutual interface required for simulation. However, the interface-based co-simulation method has the following problems: First, in the Co-simulation requires decoupling between system domains or models during modeling. For multi-domain coupling systems, it may affect the fidelity of the model and even make it difficult to simulate certain behavioral characteristics of the system. Second, co-simulation will significantly reduce the cost of simulation solutions. efficiency and accuracy, and even lead to solution failure

In the traditional simulation analysis, due to the lack of support of in-service operating data, the model parameters are obtained by fitting the component bench test data, which can only reflect the accuracy of the model, and the model deviates from the actual working conditions, and the accuracy is low; There are random errors in the service operation data, and the model parameters obtained through statistical analysis have high accuracy but low precision

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