Acoustic study on motorcycle helmets with application of novel porous materialLavrentjev, Jüri; Rämmal, HansSAE Technical Paper Series : The 25th Small Engine Technology Conference (SETC2019) : Small Powertrains–Innovating for Their Future Role, International Conference Center Hiroshima, November 19-21, 2019 : Final program2020 / Paper 2019-32-0531, p. 1-7 : ill https://www.sae.org/publications/technical-papers/content/2019-32-0531/ http://www.setc-jsae.com/2019docs/SETC2019_FinalProgram_all.pdf Conference proceedings at Scopus Article at Scopus

Design and performance of acoustic metamaterial structure for inlet duct noise attenuation [Online resource]Lavrentjev, Jüri; Rämmal, HansSETC 2017 : 23rd Small Engine Technology Conference “Small Engine Technology - Generating a Promising Future”, November 15-17, 2017 Jakarta, Indonesia : Final program : SAE Technical Paper2017 / 2017-32-006, p. 37 http://www.setc-jsae.com/past_docs/2017/list_of_paper.pdf

Endurance of micro-perforated elements in unmanned ground vechicle’s small diesel engine silencer applicationRämmal, Hans; Lavrentjev, JüriSAE Technical Paper Series : The 25th Small Engine Technology Conference (SETC2019) : Small Powertrains–Innovating for Their Future Role, International Conference Center Hiroshima, November 19-21, 2019 : Final program2020 / Paper 2019-32-0533, p. 1-8 http://www.setc-jsae.com/2019docs/SETC2019_FinalProgram_all.pdf Conference proceedings at Scopus Article at Scopus

Reliability study of micro-perforated elements in small engine silencer applicationRämmal, Hans; Lavrentjev, JüriSETC 2017 : 23rd Small Engine Technology Conference “Small Engine Technology - Generating a Promising Future”, November 15-17, 2017 Jakarta, Indonesia : Final program : SAE Technical Paper2017 / 2017-32-0075, p. 37 http://www.setc-jsae.com/setc2017docs/2017finalprogram/SETC2017_Final.pdf