Synthetic Data for Predictive Maintenance: A Systematic Review and Framework for Industry 4.0 Applications | 2026 Publication type A1 Journal article (refereed), original research Author(s) Nieminen Walter, Gebreweld Haben, Liuha Arto, Nissinen Mikko, Verdugo Mario, Mikkola Aki, Kutvonen Antero Digital revolution LUT Business School LUT School of Engineering Sciences LUT School of Energy Systems