This book includes eleven excellent chapters that have been prepared using state-of-art methodologies by professional researchers from ten different countries. The chapters in the book comprise the following titles: "System Diagnostics and Prognostics: A Review"; "Random Vibro-Impact Vibration in Mechanical Systems", "The Machine for Cutting Cane and Other Aquatic Plants in Navigable Waterways by Agustin de Betancourt y Molina": Analysis by Computer-Aided Engineering Techniques with an Autodesk Inventor Professional"; "Mechanical Systems and Microfluidics: The Application of a Vision System in the Testing of Fluids Behavior"; "The Study of Limited Invariant Sets and Structures of Relay Stabilized Systems"; "Finding an Unbiased Warranty Length for a Product Under Parametric Uncertainty of Underlying Lifetime Models"; "Modeling of Mechanical Aspects’ (Static, Dynamic) Influence on the Production of Electric Fuel Cell (PEMFC) Power"; "Quantum Graph-Type Models of the Helmholtz Resonator and Completeness of Resonance States"; "Applied Research in Forensic Engineering"; "Energy Efficiency via a Turbulator"; and "A Mathematical Model of a Rocket Engine for Reliability Analysis".