Design of fractional‐order compensator for the car suspension system

• Κύριος συγγραφέας: Μεμλίκαϊ, Εβίσα
• Άλλοι συγγραφείς: Memlikai, Evisa
• Γλώσσα: English
• Έκδοση: 2021
• Θέματα: Compensators; CMOS analog integrated circuits; Fractional calculus; Fractional-order circuits; Fractional-order elements; Car suspension; Fractional-order filters; Κλασματικός λογισμός; Κυκλώματα κλασματικής τάξης; Αντισταθμιστές; Ανάρτηση αυτοκινήτου

The subject of this M.Sc. Thesis deals with the design of a fractional - order compensator. An innovative way of design is presented having the multiple benefits of fractional calculus, such as the easier tuning of the system. In particular, the design of a compensator for the car suspension is presented, in order to control the vertical oscillation of the wheels, implying an oscillation of their distance from the main suspended body of the vehicle with main purpose, reducing the oscillations that reach the body. The compensator circuit is initially approached with various MATLAB command set methods that aim to create integer class polynomials equivalent to the fractional transfer function. Fractional - order elements are not yet commercially available, so these approaches are necessary. Then, after presenting and comparing the results of these methods and selecting the case with the the lowest error, the implementation of the circuit is supervened. The implementation of the control system has been carried out using MOS transistors that operate in the sub threshold region and allow operation with low voltage and power consumption. The last part is the simulation of the system at layout level and the presentation of the fully integrated, and fully electronically controlled circuit and its response. The performance of the proposed system is verified through post-layout simulations using Cadence and the Design Kit provided by the Austria Mikro Systeme (AMS) 0.35µm CMOS process.