Identification Method of Electrical Parameters of Vibration Energy Harvester
An energy harvester and electrical parameter technology, which is applied in the field of electrical parameter identification of vibration-type energy harvesters, and can solve problems such as inability to accurately identify the electrical parameters of the harvester.
Active Publication Date: 2019-06-04
SHANGHAI UNIV
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[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a method for identifying electrical parameters of a vibratory energy harvester to solve the problem that the electrical parameters of the harvester cannot be accurately identified when the restoring force model of the harvester is unknown
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[0027] The present invention will be further described below in conjunction with accompanying drawing.
[0028] The equivalent model of vibration energy harvester is as follows: figure 1 As shown, the model consists of mass m, nonlinear spring k n , a piezoelectric transducer with a damping coefficient c and an electromechanical coupling coefficient η. z a is the vibration displacement of the collector in absolute coordinates, z b is the basic excitation of the collector shell, then the relative displacement z can be written as equation (1)
[0029] z=z a -z b (1)
[0030] The system equations can be written as:
[0031]
[0032]
[0033] in: is the unknown restoring force function, η is the electromechanical coupling coefficient, C p is the equivalent capacitance of the piezoelectric material, R L For the external load resistance, u is the output voltage. η and C p is the unknown parameter to be estimated.
[0034] When the system is excited by a small-am...
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The invention relates to a vibration energy collector electrical parameter identification method, which belongs to the field of energy collection and solves the problem that collector electrical parameters can not be accurately estimated in a condition with an unknown collector restoring force model. Based on a collector electrical equation, the invention provides a method of identifying collector electrical parameters which are independent from kinetic parameters. Through building a relationship between a collector vibration acceleration and an output voltage amplitude, a least square method is used for solving to-be-estimated electrical parameters. The electrical parameter identification process is independent from a kinetic parameter identification process, the collector restoring force model does not need to be judged in advance, the electrical parameter identification precision is not influenced by the kinetic parameters, and thus, the method is applicable to identification of electrical parameters of various nonlinear collectors. The problems of model identification and parameter identification of the vibration energy collector in the condition with the unknown restoring force model are solved, and a theoretical basis is laid for design and optimization of the vibration energy collector.
Description
technical field [0001] The invention relates to the field of vibration energy harvesting, in particular to a method for identifying electrical parameters of a vibration energy harvester. Background technique [0002] Low-power systems such as wireless sensor nodes and monitoring units are currently widely used in structural health monitoring, fault diagnosis, and early fault warning systems. Harvesting vibration energy from the environment is one of the important ways to provide power for it, forming a research hotspot. Therefore, the development and improvement of the parameter identification method of the vibration energy harvester system has important value and significance for the structural design, parameter optimization and engineering application of the vibration energy harvester. [0003] At present, in the identification of electrical parameters of vibration energy-type energy harvesters, due to the coupling characteristics of electromechanical systems, prior infor...
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IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 陈立群袁天辰杨俭丁虎
Owner SHANGHAI UNIV