Hybrid test method based on vector finite element and FPGA

Abstract

The present invention discloses a hybrid test method based on a vector finite element and an FPGA. The method comprises the following steps: dividing a to-be-analyzed structure into a numerical sub-structure and an experimental sub-structure; establishing a numerical model in an FPGA by using a parallel computing technology and adopting a vector finite element; writing an external compensation controller in the FPGA by using a control theory of feed-forward plus feedback; designing I / O in the FPGA to implement conversion and transfer between a numerical computation amount and an experimental simulation amount; running an FPGA hardware program regularly by using a LabVIEW real-time module; transferring data between FPGA hardware and a host computer by using FIFO; setting up a displacement loading device of the experimental sub-structure and establishing a connection with an I / O module of the FPGA hardware; and in the host computer, establishing a data communication interface between the host computer and an FPGA hardware terminal, so as to realize visualization of experimental data. The method provided by the present invention can effectively solve the problem of excessive computing pressure caused by numerical sub-structure calculation in a hybrid experiment, and is particularly suitable for a hybrid experiment in which a numerical sub-structure has a large number of computing degrees of freedom and requires real-time operation.

Description

technical field [0001] The invention relates to the technical field of civil engineering test, in particular to a hybrid test method based on vector finite element and FPGA. Background technique [0002] Hybrid test is a new test method developed in recent years for testing the dynamic response of large civil structures under extreme environmental loads, such as earthquakes, typhoons, floods, etc. The hybrid test divides civil structural members into numerical substructures that are easy to simulate under the linear elastic stress state and experimental substructures that involve nonlinear and elastoplastic mechanical behaviors and are difficult to calculate according to the complexity of mechanical properties. The combined method obtains the dynamic response of the numerical value and experimental substructure respectively, and realizes the dynamic performance analysis of the whole structure through the data transfer at the boundary of the substructure. The hybrid test is ...

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Problems solved by technology

However, such simplification greatly limits the scope of application of real-time mixing experiments.

For those structural systems with uniform mass distribution, such as cables, dams, long-span bridges, etc., the mechanical behavior of the numerical substructure must adopt a sufficient number of degrees of freedom to achieve accurate simulations, which makes real-time substructure tests often difficult due to numerical Computational pressure on substructure parts is too high for real-time effects

[0004] In summary, how to effectively solve the technical problem that real-time results cannot be achieved due to the excessive calculation pressure of the numerical substructure when performing mixed tests on the mass distribution system structure with a large number of degrees of freedom in the numerical substructure is currently a problem for those skilled in the art. Known and Urgently Needed Problems

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