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All Journal Automotive Experiences Al Jahiz: Journal of Biology Education Research
Faris, Waleed Fekry
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Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Education Electrical & Electronics Engineering Energy Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering

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Evaluation the New Hydro-Pneumatic Damper for Passenger Car using LQR, PID and H-infinity Control Strategies Abd - Elwahab, M. Rabie; Moaaz, Ahmad O.; Faris, Waleed Fekry; Ghazaly, Nouby M.; Makrahy, Mostafa M.
Automotive Experiences Vol 7 No 2 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10796

Abstract

In this study, a mathematical model of a new hydro-pneumatic damper consists of a double-acting cylinder, two oil chambers, a damping valve, and an accumulator is developed to assess its response to vertical vibrations in a passenger car. The main idea of the new damper aim to make that the damping coefficient in compression differ than that in rebound which achieve more stability specially during cornering. The damping coefficient difference in compression and rebound can be achieved due to the presence of accumulator. Both passive and active hydro-pneumatic suspension systems with the new damper employing different control strategies such as LQR, PID, and H-infinity control, are employed to assess the effectiveness of the suspension system. The investigation focuses on vertical acceleration, pitch acceleration, suspension deflection, and dynamic tire load. The half-car model is simulated using MATLAB/Simulink, and the results for both active and passive hydro-pneumatic suspensions are analyzed in terms of frequency, time, and power spectral density responses. The findings reveal that the active suspension system with H-infinity control demonstrates an 81% improvement in body acceleration and a 92% improvement in pitch acceleration (angular acceleration) compared to the passive hydro-pneumatic suspension which improve the stability of the vehicle during cornering. Similarly, the implementation of LQR-controlled suspension enhances body acceleration and step acceleration by approximately 40% and 57%, respectively, compared to the passive hydro-pneumatic suspension. Moreover, when compared to the passive hydro-pneumatic suspension, the PID-controlled active hydro-pneumatic suspension exhibits a 64% improvement in step acceleration and a 44% improvement in body acceleration.
Xenotransplantation: A Bioethical Inquiry from Islamic Perspectives Wong, Kee Lam; Faris, Waleed Fekry
Al Jahiz Vol 5 No 2 (2024): Al-Jahiz: Journal of Biology Education Research, July-December 2024
Publisher : Fakultas Tarbiyah dan Ilmu Keguruan UIN Jurai Siwo, Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32332/al-jahiz.v5i2.9544

Abstract

Health, Sicknesses or Diseases in Man are part and parcel of human existence. Islamic Bioethics cover all these life time events from before birth to death and after death. Islamic Thought has indispensable contributions in and is inseparable from Islamic Bioethics. Major Organ Failures are increasingly prevalent and affect the quality of life and survival of enormous number of patients. Allotransplantation gives the ‘second’ life to these patients. However, the supply gap of Human Organs results in phenomenal bioethical and legal problems. Xenotransplantation, especially Porcine Xenotransplantation, can solve this supply gap and those consequential problems. A systematic analysis using English Publications is done to ascertain various bioethical aspects of Xenotransplantation as applicable from the Islamic Perspectives. The authors argue that the prohibition of Pork in Islam is metaphysical. The current permissibility for PXT may be premature and over-simplifies a much-complicated issue. Public interest is often under-considered in Organ Transplantation deliberations. The contributions of Islamic Thought and Islamic Bioethics in Health, Sickness, Treatment, PXT and theological objections to PXT are analysed and discussed. Muslim Countries may have the obligation of promoting and ensuring the success of PXT especially for the interests of under-privileged Muslims.
Co-Authors Abd - Elwahab, M. Rabie Ghazaly, Nouby M. Makrahy, Mostafa M. Moaaz, Ahmad O. Wong, Kee Lam