The thesis compares different methods used to obtain structural dynamic responses: Mode Displacement, Modal Truncation Augmentation, and Mode Acceleration. There is limited existing literature on these methods, with only a few recent scientific articles providing further insights into their differences and capabilities. The thesis conducts detailed analyses of the mentioned methods and also compares the "Inertia Relief-based" method to the Modal Truncation Augmentation method. Both methods are implemented by default in MSC Nastran's RESVEC function, which calculates residual vectors to obtain improved structural dynamic responses. Chapter 1 discusses the first methods, while Chapter 2 focuses on their implementation, code validation using reference literature data, and application to the Euler-Bernoulli beam finite element model.