Development of a finite element model of a finger pad for biomechanics of human tactile sensations

Vodlak, Teja; Vidrih, Zlatko; Fetih, Dusan; Perić, D.; Rodič, Tomaž

doi:10.1109/embc.2015.7318510

Cited by 3 publications

(4 citation statements)

References 12 publications

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“…Previous finite element studies of human touch [28][29][30][31][32][33][34][35][36][37][38] mostly consider two or three dimensional simulations of finger tactile exploration, studying mechanical behaviour at the point of contact or within the soft tissue. Abdolvahab [39] proposed a biomechanical model of a finger for simulation of the squeeze film effect, i.e.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Multi-physics modelling and experimental validation of electrovibration based haptic devices

et al. 2016

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Electrovibration tactile displays exploit the polarisation of the finger pad, caused by an insulated high voltage supplied plate. This results in electrostatic attraction, which can be used to modulate the users perception of an essentially flat surface and induce texture sensation. Two analytical models of electrovibration, based on parallel plate capacitor assumption, are demonstrably taken and assessed by comparisons with experimental results published in literature. In addition, an experimental setup was developed to measure the electrostatic force between the finger pad and a high voltage supplied plate in a static and out-of-contact state in order to support the use of parallel plate capacitor model. Development, validation, and application of a computational framework for modelling tactile scenarios on real and virtual surfaces rendered by electrovibration technique is presented. The framework incorporates fully parametric model in terms of materials and geometry of the finger pad, virtual and real surfaces, and can serve as a tool for virtual prototyping and haptic rendering in electrovibration tactile displays. This is achieved by controlling the applied voltage signal in order to guarantee similar lateral force cues in real and simulated surfaces.

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…The material and geometrical properties used in the model were obtained from literature [32,47], see Table 2. Since the finger pad can exhibit large elastic deformations the hyperelastic Neo-Hookean constitutive law is employed [35,48,49]. Built-in two dimensional quadrilateral plane strain F-bar finite elements [50] are utilised.…”

Section: Mechanical Domainmentioning

confidence: 99%

Multi-physics modelling and experimental validation of electrovibration based haptic devices

et al. 2016

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“…FEM simulations of tactile scenarios Previous finite element studies of human touch mostly include two or three dimensional modelling of finger pad exploration of real surfaces on tribological [16,17] as well as neuro-mechanical levels or vibratory stimulations [18][19][20]. Abdolvahab [21] simulated the "squeeze film" effect, by comparing sliding of a finger pad over a real edge and a surface with varying friction coefficient.…”

Section: Input Friction Datamentioning

confidence: 99%

“…The multi-physics computational framework used in this work is capable of simulating friction modulation due to electrostatic attraction directly from applied voltage signal in the haptic display, without changing the friction properties of the surface. Current work employs a 2D version of previously developed framework validated with experimental data [20,17] as it is very useful for parametric studies in parallel to the computationally intensive 3D model. The framework was used here mainly in order to generate friction profiles µ RS (r) for CAE database for three simple RS, i.e.…”

Section: Input Friction Datamentioning

confidence: 99%

Electrovibration Signal Design

Vidrih

Vezzoli²

2016

Haptics: Perception, Devices, Control, and Applications

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Electrovibration technique can modify user's perception of a surface through the modulation of the sliding friction accordingly to the voltage applied. This paper is introducing a novel approach to virtual haptic rendering in electrovibration based haptic displays in order to provide realistic feeling of a simulated surface, where the required voltage signal is obtained using a simplified equation. The approach was validated by the use of a finite element computational framework able to simulate tactile scenarios on real and virtual surfaces. A database of precompiled tactile scenarios was generated to predict outputs for custom parametric surfaces through a conditional average estimator method. In addition, an experimental database obtained by active exploration of different surfaces, is utilised for texture rendering. A web application, comprising the algorithms described in the paper, has also been developed, and is freely available to use at http://www.haptictexture.com.

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Friction Reduction through Ultrasonic Vibration Part 1: Modelling Intermittent Contact

Vezzoli

Vidrih

Giamundo

et al. 2017

IEEE Trans. Haptics

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Ultrasonic vibration is employed to modify the friction of a finger pad in way that induces haptic sensations. A combination of intermittent contact and squeeze film levitation has been previously proposed as the most probable mechanism. In this paper, in order to understand the underlying principles that govern friction modulation by intermittent contact, numerical models based on finite element (FE) analysis and also a spring-Coulombic slider are developed. The physical input parameters for the FE model are optimized by measuring the contact phase shift between a finger pad and a vibrating plate. The spring-slider model assists in the interpretation of the FE model and leads to the identification of a dimensionless group that allows the calculated coefficient of friction to be approximately superimposed onto an exponential function of the dimensionless group. Thus, it is possible to rationalize the computed relative reduction in friction being (i) dependent on the vibrational amplitude, frequency, and the intrinsic coefficient of friction of the device, and the reciprocal of the exploration velocity, and (ii) independent of the applied normal force, and the shear and extensional elastic moduli of the finger skin provided that intermittent contact is sufficiently well developed. Experimental validation of the modelling using real and artificial fingertips will be reported in part 2 of this work, which supports the current modelling.

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Development of a finite element model of a finger pad for biomechanics of human tactile sensations

Cited by 3 publications

References 12 publications

Multi-physics modelling and experimental validation of electrovibration based haptic devices

Multi-physics modelling and experimental validation of electrovibration based haptic devices

Electrovibration Signal Design

Friction Reduction through Ultrasonic Vibration Part 1: Modelling Intermittent Contact

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