چكيده به لاتين
Brake pad is an essential part of braking system and play a significant role in the safety and comfort of passengers. Many researches has been conducted, in recent years, to simulate the brake pad behavior. In this thesis, the brake pad wear of a passenger car is simulated, using finite element analysis. Also a sensitivity study is performed to show the ways of improving the design parameters. In this context, a standard-sized pin of a known brake pad is cut for testing. Test results such as friction and wear coefficients are used in numerical simulation. Then an algorithm is proposed for finite element simulation of wear combining with the Archard’s wear equation. As the first step, the obtained results of pin wear simulation are compared with experimental measurements. Comparing the worn mass in experimental and numerical approaches shows high accuracy of the developed algorithm. Consequently, single-piston and double-piston brake pad cases are studied. The amount of contact area between rotor and pad, worn mass and squeal possibility in two types of brake pad are compared. It is shown that using a double-piston brake pad can improve the mentioned parameters comparing to single-piston case. After defining four design parameters for a double-piston brake pad, Taguchi Method with orthogonal array is applied to find optimum levels of defined parameters to maximize the contact area and minimize the “worn mass. The ANOVA method is used for estimating the influence of each parameter on desired outputs. It is shown that the contact area is most likely be affected by back plate thickness while the worn mass is more sensitive to the piston diameter closer to the pad leading edge. Finally, after designing Taguchi and finding optimum levels of variables for the least amount of the wear, low impact also the slight wear of the brake pad on the amount of material into the environment is studied.
