Identification of a bird constitutive model and its parameters is a very difficult work in bird-impact coupling solution. In order to identify the constitutive model and the parameters simultaneously, an inversion analytic model for the bird material parameters is given based on penalty function method and nonlinear optimization principle, and then combining the model preferential criterion proposed in this paper, the identification system of the bird constitutive model is established with ANSYS Parametric Design Language (APDL). Finally, the feasibility and practicability of this identification method are verified by an example.
In order to improve the photovoltaic maximum power point tracking (MPPT) system efficiency and electrical performance, the multiple DC/DC converter technology is introduced into the photovoltaic MPPT system. And a novel control strategy is proposed, which make the multiple DC/DC converter can change operating mode according to the ambient light intensity, to achieve a more flexible and effective photovoltaic MPPT control. The working process and implementation of the new photovoltaic MPPT system with multiple DC/DC converters was analyzed, and the experimental results are provided to verify the feasibility of superiority and the proposed system solutions.
The dual-excited electromagnetic flowmeter with arc-electrodes in the paper can measures liquid level and flow velocity. A pair of electrodes is set as signal injection electrodes on the pipe bottom. AC signal injected used to determine liquid level. The theoretical analysis and experiment results indicate that it is feasible for partially filled pipes.
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