Calculation of temperature of carbon disks of aircraft brakes with account of heat exchange with the environment

Some theoretical model for determining the temperature field of a multi-disk brake

“…where the parameters B i n are calculated from formulae (30) and (33). On the surface of friction ζ = 0 from formula (80) follows known result 23…”

“…where Y(z, t) is the new sought function. Taking into account substitution (23), the boundary-value problem (17)- (20) is presented in the following form…”

“…Calculations were performed for a disk with dimensions d = 14 mm, r i = 26:5 mm, and r e = 37:5 mm, which is made of carbon fibrous composite material Termar-ADF (K r = K z = 21 W m À1 K À1 , c = 728:5 J kg À1 K À1 , and r = 1800 kg m À3 at initial temperature T a = 208C). 23 First, to validate the proposed theoretical model, the temperature values obtained from this model are compared with appropriate experimental data from a previous article. 23 The mentioned experiment applies the heat generation process in the multi-disk aircraft brake with linear reduction of the sliding speed and constant pressure (t i = 0) on the contact surfaces.…”

“…Elongation of braking time and reduction of the pressure and coefficient of friction at modes Solid lines-results from exact solution, dashed lines-results from exact solution without account of convection (for h = 0), dotted lines-the experimental data. 23 Figure 5. Dependences of maximum temperature T max achieved during the process on the coefficient of heat transfer h for three modes of braking.…”

Thermal approach to classifying sequentially written fiber Bragg gratings

“…For these reasons, FBGs find their application in various sectors, for example, automotive, civil engineering, and aerospace [3]. The broad temperature range in aerospace environments is specifically challenging for sensor development, as they can range from −55°C externally over 600°C near the brakes and over 1500°C in the engines [4,5]. Depending on the grating type, the FBGs can withstand temperatures up to and over 1000°C.…”