Chapter 4 Tires, Wheels, and Brakes Virginia Tech（第四章轮胎、车轮和刹车弗吉尼亚理工大学）.pdf

Chapter 4 Tires, Wheels, and Brakes 4.1. Introduction The number of tires required for a given aircraft design gross weight is largely determined by the flotation characteristics, which will be discussed in detail in Chapter Seven. Assuming that the number and distribution pattern of the tires is already known, this chapter provides guidelines to the selection of the tires, wheels, and brakes that will meet the performance and safety requirements [2 and 20]. As a part of the landing gear configuration definition process, tires, wheels, and brakes selection algorithms were developed based on the procedure as discussed in this chapter. Specified selection criterion, e.g., minimum size, weight, or pressure, are used to select suitable tires and wheels from manufacturer’s catalog [24] and industry standards [25], while statistical database was used to size the brakes as required to meet the braking requirements. 4.2. Type, Size and Inflation Pressure of the Tire The tire selection process involves listing all candidates that meet the performance requirements. A list of tires and wheels used on commercial transports can be found in Appendix D. The primary consideration is the load-carrying capacity of the tire during the speed regime normally applicable for landing or takeoff cycles. In addition, the number of plys and type of construction, which determines the weight of the tire and its operational life, is important from an economic standpoint. Other considerations include the inflation pressure of the tire and the size of the wheel. The former must be chosen in accordance with the bearing capacity of the airfield from which the aircraft is designed to operate from, whereas the latter must have sufficient space to house the brake assembly. 30 4.2.1. Basic Tire Constructions Radial tires have gained growing acceptance since t