The Design And Measurement Analysis Of Engine Front End Accessory Drive System

Engine Front End Accessory Drive system is collectively referred to all kinds ofaccessory drive systems at the engine front end, including the serpentine belt accessory drivesystem and V-typed belt accessory drive system, we call it FEAD system for short. Theaccessories such as aircondition compressor, water pump, alternator, power steering and fansare driven by the crankshaft through the transmission belt. In order to guarantee thetransmission ability, tensioning devices are used in the FEAD system to make proper tensionon the belt.When compared with the V-typed belt accessory drive system, the serpentine beltaccessory drive system has an advantage of large contact area, easy to maintain, lowertransmission power loss, compact space for the layout etc. Due to the space saving ability thatuse only one V-ribbed belt can drive all the accessories to work, V-ribbed belt is widely usedafter the twice oil crisis broke out in the1970s.The FEAD system, if not well pre-designed at the static status, directly use dynamicsimulation and/or experimental verification to find out a good layout design proposal. Thenthis method appears to aimless and low efficiency as it look for terms in a wide range andtakes a lot of time. Therefore, from the R&D costs and shorten the development cycleconsiderations, pre-static-design becomes necessary. The study work of this dissertationincludes:1. Introduce the basic principles of belt drive and layout design. Gives the definition andcalculation methods of the system slip threshold.2. From the following three aspects expound the FEAD system’s noise generation andcontrol: pulley misalignment, slipping and resonance.3. Introduce the process of the calculation of the FEAD system, determine the mainparameters for the V-ribbed belt, tensioners.4. Introduce the measurement methods and data processing methods of the FEADsystem.