Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 43, Issue 1 (2018) 20-36 20 Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Journal homepage: www.akademiabaru.com/arfmts.html ISSN: 2289-7879 Volume Displacement Simulation Impact on the Water Hydraulic Hybrid Driveline Performance Ahmad Anas Yusof 1,* , Saiful Akmal Sabaruddin 1 , Mohd Noor Asril Saadun 1 , Faizil Wasbari 1 1 Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, 76I00 Durian Tunggal, Melaka, Malaysia ARTICLE INFO ABSTRACT Article history: Received 13 February 2018 Received in revised form 1 March 2018 Accepted 2 March 2018 Available online 7 March 2018 The impact of volume displacement simulation on the Water Hydraulic Hybrid Driveline performance is presented in this paper. Hydraulic hybrid system vehicles depend on oil based hydraulic fluid. Therefore, natural concerns of environment and safety promote the uses of the water-based hydraulic hybrid system. The focus of this paper is to gather simulation data of the potential on using water hydraulic technology in hydraulic hybrid systems. In this paper, an extensive study on the mathematical modeling and simulation by using Matlab/Simulink has been conducted to determine the feasibility of water compared to oil, HyspinAWS68 in term of the performance of the hydraulic hybrid driveline. The simulation result indicates that the best performance of hydraulic hybrid driveline is at the specification of volumetric displacement of 250 cm 3 /rev. Keywords: Hydraulic hybrid system, water hydraulic, hydraulic fluid, fluid power Copyright © 2018 PENERBIT AKADEMIA BARU - All rights reserved 1. Introduction The main function of a hydraulic fluid in a hydrostatic power system is to transmit power and movement. In addition to the power transmission, the hydraulic fluids serve to lubricate the contact surfaces, cool different elements and clean the system [1-3]. Typical hydraulic technology depends on petroleum-based hydraulic fluid. Mineral oil has come to be the most popular choice primarily because of its excellent protection against corrosion and good lubricity [4]. However, mineral oil used in oil hydraulic equipment poses a fire hazard in the event of a spillage or leakage. This is especially critical in vehicle accident scenarios where the oil spillage might trigger fire mishaps as explained in the previous study [5-10]. Typical concerns of fire and safety in hydraulic systems promote the uses of the water-based hydraulic system. Through the usage of water hydraulics, problems related to safety and contamination of oil hydraulics in typical hydraulic hybrid technology can be avoided. Water was used in the early days for the transmission of the fluid power. The main advantage of water as pressure medium is its availability, fire resistance, and low cost. On the other hand, the disadvantage of water is poor lubricity, high tendency of rust and has a * Corresponding author. E-mail address: anas@utem.edu.my (Ahmad Anas Yusof) Penerbit Akademia Baru Open Access