PSO algorithm based thermal contact resistance estimation for variable force hand/object interaction

Modeling thermal contact resistance at the finger-object interface

“…σ % σ skin . With this assumption and substitution of the range of skin properties indicated in Table 1 into Equations (5) and (6), Figure 3(a) shows that PM model predictions are in remarkably good agreement with data for finger contact with an aluminum plate from Maamir et al [12]. This agreement is not surprising since Equation (6) was obtained by fitting data on comparably soft materials and metal surface interfaces where k 2 ) k 1 .This notion, however, starts to be questionable for marble (k marble ¼ 2.9 Wm −1 K −1 ) and is not valid for wood (k wood ¼ 0.23-0.4 Wm −1 K −1 [38] that is comparable to k skin ¼ -0.37 Wm −1 K −1 ).…”

“…The most commonly utilized model for predicting R c at finger-object interfaces [7,9,[12][13][14][15][16][17][18][19][20] was developed in the 1960s by Cooper, Mikic and Yovanovich (CMY) to predict thermal contact resistance between two contacting materials (subscript 1 and 2) with random surface roughness that are much harder CONTACT Konrad Rykaczewski konradr@asu.edu Supplemental data for this article can be accessed here. TEMPERATURE 2019, VOL.…”

“…It is also worthwhile noting that due to the lower exponent, the large variation of measured G skin ( AE 25%) results in only about AE 6% variation in the value of R 00 cÀPM : At P < 2.5 kPa, R 00 cÀCMY is equal to or Table 1. Thermal properties of skin and BaF 2 [27,31] as well as aluminum, marble, and wood [12,38] (in the case of the latter upper value of thermal conductivity was from [38] was used). Since values in italic were not reported, the typical range reported in literature was used instead [37,[39][40][41].…”

“…To further test the applicability of the PM model, the theoretical predictions of finger contact resistance are compared with another experimental data set reported by Maamir et al [12] for fingers in contact with aluminum, marble, and wood surfaces. Unfortunately, these authors did not report apparent contact areas and surface roughness of skin or samples (or any details on sample preparation), therefore several assumptions must be made to calculate the contact resistance.…”

“…Unfortunately, these authors did not report apparent contact areas and surface roughness of skin or samples (or any details on sample preparation), therefore several assumptions must be made to calculate the contact resistance. To start with, Ho and Jones' [27] correlation for A a as a function of F is adopted to determine that the 0.25-10 N force range tested by Maamir et al [12] corresponds to about 1-50 kPa pressure range. While this range is much broader than the first test case of 0.7-11 kPa discussed above, this pressure range is comparable to one reported by Galie et al (up to 35 kPa) [36].…”