Electrode-skin impedance model parameter identification method based on stimulation frequency response

A technology of skin impedance and model parameters, applied in probabilistic CAD, CAD numerical modeling, special data processing applications, etc., can solve problems such as being unsuitable for highly nonlinear and non-convex, complex optimization, and slow convergence speed.

Active Publication Date: 2020-10-20
NANCHANG UNIV
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Problems solved by technology

However, most meta-heuristic algorithms cannot balance exploration and development well, and there are problems such as slow convergence speed and easy to fall into local optimum.
[0006] To sum up, it can be seen that the existing human skin impedance circuit model only considers the skin impedance and ignores the influence of the contact between the human fingertip and the electrode array.
Moreover, when establishing a nonlinear skin impedance model, the existing skin impedance model only considers that the nonlinear impedance is related to stimulati

Method used

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  • Electrode-skin impedance model parameter identification method based on stimulation frequency response
  • Electrode-skin impedance model parameter identification method based on stimulation frequency response
  • Electrode-skin impedance model parameter identification method based on stimulation frequency response

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Embodiment Construction

[0037] The invention will be further illustrated by the following examples.

[0038] Step 1. Deriving the mathematical expression of the electrode skin impedance model, which is specifically expressed as follows:

[0039] (a) First set the electrode-skin impedance model nonlinear resistance R p The relationship with the stimulation frequency f is:

[0040] R p (f)=a+be c / f (7)

[0041] where a, b and c are model constants.

[0042] (b) Skin-electrode impedance for:

[0043]

[0044] Among them, the relationship between the ω angular frequency and the frequency f satisfies: ω=2πf. So (8) can be written as:

[0045]

[0046] (c) Empathy for epidermis-deep tissue impedance for:

[0047]

[0048] (d) Overall electrode-skin impedance So there are:

[0049]

[0050] (e) Further obtain the mathematical expression of the electrode-skin impedance circuit model:

[0051]

[0052] where r is determined by the constant resistance r 1 、r 2 Composition, j i...

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Abstract

The invention discloses an electrode-skin impedance model parameter identification method based on stimulation frequency response. The method is characterized in that resistance and capacitance parameters of the electrode and finger epidermis, finger dermis and subcutaneous tissue are fully considered, an electrode-skin impedance model based on stimulation frequency response is provided for the first time, an improved sine and cosine algorithm is used for identifying parameters of the electrode-skin impedance model, and an accurate electrode-skin impedance model is obtained.

Description

technical field [0001] The invention relates to the parameter identification of a human hand electrode-skin impedance model in an electric stimulation-based tactile feedback device, in particular to a model parameter identification method in an electrode-skin impedance model based on a stimulation frequency response. It is used to construct an accurate force-tactile mapping relationship in the human-computer interaction system to ensure the stability and accuracy of the human-computer interaction electric tactile reproduction control. Background technique [0002] In recent years, tactile reproduction technology has been widely used in human-computer interaction fields such as robots and virtual reality. Due to the advantages of simple structure, fast response and easy control, electrotactile devices have been highly valued by researchers from all walks of life. However, establishing an accurate skin impedance model based on measured stimulus-response data is crucial for ta...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F111/08G06F111/10
CPCG06F30/20G06F2111/08G06F2111/10
Inventor 李春泉罗族何永华江逸冰熊维进王子航陶艺程
Owner NANCHANG UNIV
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