Seminar khoa học 12/5/2022
Seminar khoa học tiếp theo của Viện Khoa học Tính toán (INCOS) và Viện Khoa học Vật liệu Tiên tiến (AIMaS), Trường Đại học Tôn Đức Thắng, sẽ được tổ chức trực tuyến vào lúc 9h00 sáng thứ Năm, ngày 12/5/2022.
9.00 AM – 10.00 AM: TS. Nguyễn Sỹ Dũng trình bày về "SD-TCSs Control Deriving from Fractional-order Sliding Mode and Fuzzy-compensator"
Uncertainty and disturbance (UAD) always exist and influence negatively on technical systems. Focusing on improving the effectiveness of smart dampers (SDs)-based semi-active train-car suspensions (SD-TCSs), we present the fuzzy-compensator-enhanced fractional-derivative (FD) order sliding control of a class of SD-TCSs subjected to UAD, in which the disturbance time-varying rate (DTVR) may be high but bounded. To reduce uncertainty related to the mathematical model error, we propose a fractional derivative (FD)-based sliding mode controller (FDSMC) for specifying the main control signal. Whereas, to estimate the compensation for external disturbance, first, we utilize the well-known DO to build an initial framework of the compensator. To avoid conflict between the update-laws of the DO and FDSMC, as well as to make the system dynamic response converge stably to the desired state even if the DTVR increasing but bounded, constraints along with a fuzzy-based adjusting mechanism are then discovered. Thus, we obtain an improved DO (imDO), update-laws of the imDO and FDSMC, and their combination model (imDO-FDSMC) of the proposed controller. The survey results reflect the positive capability of the method.
10.00 AM - 11.00 AM: TS. Nguyễn Trương Khang trình bày về "Microwave and millimeter-Wave Reconfigurable Antenna for 5G Smart Wireless Applications"
Frequency bands for 5G New Radio are separated into two different frequency ranges which include sub-6 GHz frequency band and frequency bands from 24.25 GHz to 52.6 GHz, i.e., millimeter-wave (mmWave) band. In sub-6 GHz band, Cognitive Radio (CR) has emerged as an enabling technology for dynamic, efficient, and flexible spectrum utilization. Particularly, Reconfigurable Antenna (RA) designs in CR system architecture are crucial for either sensing/monitoring or transmitting/communicating functions that can effectively switch its operation between two operating modes. In another hand, mmWave band typically demands exchanging a huge amount of data with small latency while still having reduced size and improved energy efficiency. In addition, reconfigurability in radiation and/or polarization is essential to improve the D2D (device-to-device) communication quality which has to be handled specially in dynamically changing and harsh industrial environments. Therefore, MIMO (multi- input-multi-output) RA in mmWave band has recently attracted the interest of researchers in both academics and industry fields. In this talk, I will present the RA techniques used in microwave and mmWave bands which aims to propose a mmWave MIMO Reconfigurable Antenna based on SIW (Substrate-Integrated-Waveguide) cavity to solve the above-mentioned challenges.