eprintid: 19482 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/01/94/82 datestamp: 2024-06-04 14:11:57 lastmod: 2024-06-04 14:11:57 status_changed: 2024-06-04 14:05:49 type: article metadata_visibility: show creators_name: Zulkifli, S.A. creators_name: Mohd, M.S. creators_name: Abd Aziz, A.R. title: Modeling and Validation of Engine Cylinder Pressure During Starting of Free-Piston Linear Generator by Brushless Motor Commutation ispublished: pub keywords: Engine pistons; Expansion; Linear motors; Mass transfer, Brushless motors; Compression-expansion; Cylinder pressures; Expansion process; Free piston; Free-piston linear generators; Linear engine generators; Mechanical modeling; Modeling and validation; Pressure profiles, Engine cylinders note: cited By 0; Conference of 7th International Conference on Production, Energy and Reliability, ICPER 2020 ; Conference Date: 14 July 2020 Through 16 July 2020; Conference Code:284729 abstract: This paper describes mechanical modeling of a specific configuration of free-piston linear engine-generator (FPLG) during starting, by brushless commutation of linear motor.To account for piston blow-by, or air leakage through piston rings at low starting speeds, the model incorporates an air mass transfer algorithm for the air compression-expansion process in the engine cylinders.The model is verified with experimental data.Pressure profiles obtained during experimental validation of the FPLG are discussed, for different motoring conditions.The improved model shows a reduction of 28 in compression pressure compared to the ideal case.In single-stroke tests, the airflow corrective factor value of C = 3.7 Ã� 10â��7 is found to give the closest profile to experimental pressure for the right cylinder and C = 5.5 Ã� 10â��7 for the left cylinder, while C = 4.1 Ã� 10â��7 best matches the data of cyclic motoring tests.Results show that by increasing motoring voltage, the pistonâ��s amplitude remains unchanged, since increasing motoring energy leads to better compression-expansion process, more effective air spring and a pressure profile closer to the lossless system. © 2023, Institute of Technology PETRONAS Sdn Bhd. date: 2023 official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85140772179&doi=10.1007%2f978-981-19-1939-8_23&partnerID=40&md5=90df1e551eec2c0851166a6dff43f554 id_number: 10.1007/978-981-19-1939-8₂₃ full_text_status: none publication: Lecture Notes in Mechanical Engineering pagerange: 263-279 refereed: TRUE citation: Zulkifli, S.A. and Mohd, M.S. and Abd Aziz, A.R. (2023) Modeling and Validation of Engine Cylinder Pressure During Starting of Free-Piston Linear Generator by Brushless Motor Commutation. Lecture Notes in Mechanical Engineering. pp. 263-279.