Research and design of a novel, low-cost and flexible tactile sensor array

Huang, Yuanyang; Jiang, Qi; Li, Yibin; Zhao, Chenlu; Wang, Junjie; Liang, Pei

doi:10.1016/j.measurement.2016.09.021

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…The hyperelastic membrane material represented by EAPs possesses the characteristics of large elasticity and high strain energy density. It has a wide application prospect in high-tech fields such as soft robots [1][2][3], flexible actuators, and transducers [4,5]. Because the uniaxial tension test cannot accurately describe such material characterization and because friction between the contact surfaces occurs during uniaxial compression, resulting in complex stress states such as compression and shear, which results in inaccurate test results, the equibiaxial tension test of a hyperelastic membrane has become the primary method for determining its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Equibiaxial Planar Tension Test Method and the Simulation Analysis for Hyperelastic EAP Membrane

Luo

Zhu

Zhao

et al. 2023

Advances in Polymer Technology

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The equibiaxial planar tension test is an important method for determining the mechanical properties of hyperplastic membranes, and it is also critical to designing an effective equibiaxial tension test rig to meet experimental accuracy requirements. However, any analysis addressing the accuracy of this test is not reported in the literature. In this paper, an equibiaxial planar tension apparatus is proposed for conducting single-corner-point tension tests on hyperelastic electroactive polymer (EAP) membranes. The experimental data were compared with those obtained from two-corner-point-fixed tension tests and fitted with nonlinear material models, and the model’s parameters were also evaluated. Finally, the widely-used finite element software ABAQUS was employed to simulate equibiaxial planar tension methods and investigate the impact of clamping mode and point number on test accuracy as well as the uniformity of overall deformation. The test results indicate that the stress-strain curves for the two tensions remain consistent across small stretch ratios. However, as the stretch ratio increases (about λ > 2.25 ) in two-corner-point-fixed tension, stress shielding may lead to a degradation of strain uniformity and result in greater stresses than single-corner-point tension. Additionally, both the three-parameter Yeoh model and the four-parameter Ogden model can provide an accurate description of the EAP membrane material. The simulation results indicate that the axial strain variation amplitudes remain below 5% within a region spanning approximately 80% of the specimen’s overall length from its center to edge and even below 1% within a region spanning 85% in the single-corner-point tension; stress inaccuracies increase with stretch ratio, while the calculated error is about 2.1% when λ = 4 in the single-corner-point tension test, which has the smallest stress error among the tests; when the number of tension points is increased, the overall deformation becomes more sufficient, and the test accuracy improves as well. The conclusions drawn from this paper will be beneficial in designing equibiaxial planar tension test rigs and analyzing their accuracy and uniformity of deformation.

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Section: Introductionmentioning

confidence: 99%

Equibiaxial Planar Tension Test Method and the Simulation Analysis for Hyperelastic EAP Membrane

Luo

Zhu

Zhao

et al. 2023

Advances in Polymer Technology

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“…Combined with the triangle positioning algorithm, his team realized the detection of contact force and contact position. The results show that the force and space detection accuracy of the pressure sensor array reaches 88.23% [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Plantar Pressure Detection System Based on Flexible Hydrogel Sensor Array and WT-RF

Liu

Xiao

Wang

et al. 2021

Sensors

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This paper presents a hydrogel-based flexible sensor array to detect plantar pressure distribution and recognize the gait patterns to assist those who suffer from gait disorders to rehabilitate better. The traditional pressure detection array is composed of rigid metal sensors, which have poor biocompatibility and expensive manufacturing costs. To solve the above problems, we have designed and fabricated a novel flexible sensor array based on AAM/NaCl (Acrylamide/Sodium chloride) hydrogel and PI (Polyimide) membrane. The proposed array exhibits excellent structural flexibility (209 KPa) and high sensitivity (12.3 mV·N−1), which allows it to be in full contact with the sole of the foot to collect pressure signals accurately. The Wavelet Transform-Random Forest (WT-RF) algorithm is introduced to recognize the gaits based on the plantar pressure signals. Wavelet transform realizes the signal filtering and normalization, and random forest is responsible for the classification of the processed signals. The classification accuracy of the WT-RF algorithm reaches 91.9%, which ensures the precise recognition of gaits.

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“…Flexible pressure distribution sensors based on polymers have also been developed. [8][9][10][11][12][13][14][15][16] In general, these devices are applicable to large areas with low spatial resolution because of their flexibility and low cost per unit area. Additionally, they can be worn around the arm or stomach, and are often used to evaluate the tactile stimulation of these body parts.…”

Section: Introductionmentioning

confidence: 99%

Planar-type MEMS tactile sensor integrating micro-macro detection function of fingertip to evaluate surface touch sensation

Watatani

Terao

Shimokawa

et al. 2019

Jpn. J. Appl. Phys.

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In this study, a tactile sensor integrating micro-and macro-scale tactile detection components was developed to reproduce the micro/macro touch sensations of the human fingertip. The micro-scale tactile detection component comprises a 500 μm diameter contactor that mimics the shape and size of the fingerprint ridge, and detects the micro shape of surfaces and local friction with high spatial resolution. The macro-scale tactile detection component detects the overall contact force and slipperiness via a wide-area sensor that mimics the skin of the fingertip. Three fabric samples with different weave structures were analyzed using the fabricated device. The fine surface pattern of the fabrics and slip friction were detected, and the differences according to the weave structure clearly extracted. Additionally, the contact force dependency of the tactile information, which is an important factor with regard to the touch sensation of a fabric, was successfully obtained using the two detection components.

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Research and design of a novel, low-cost and flexible tactile sensor array

Cited by 9 publications

References 11 publications

Equibiaxial Planar Tension Test Method and the Simulation Analysis for Hyperelastic EAP Membrane

Equibiaxial Planar Tension Test Method and the Simulation Analysis for Hyperelastic EAP Membrane

Plantar Pressure Detection System Based on Flexible Hydrogel Sensor Array and WT-RF

Planar-type MEMS tactile sensor integrating micro-macro detection function of fingertip to evaluate surface touch sensation

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