A diverse collection of research articles exploring various aspects of mechanical and structural dynamics. The issue encompasses a wide range of topics, including robotics, transmission systems, control methods, fault diagnosis, vibration analysis, and energy harvesting.

The issue kicks off with an exploration of robot-assisted reduction of pelvic fractures, where a hybrid configuration of a parallel mechanism and guide rail is designed for large workspace and load capacity requirements. The subsequent articles delve into transmission systems, featuring studies on power reflux hydraulic transmission systems, discrete sliding mode control for brushless DC motors, and fault diagnosis utilizing deep learning techniques.

The journal also delves into advanced vibration analysis methods. One study introduces the application of one-dimensional convolutional neural networks for mechanical transmission fault diagnosis, while another proposes an improved convolutional neural network approach for rotating machinery fault diagnosis, demonstrating enhanced accuracy and reduced training time.

Furthermore, the issue delves into practical applications, including fault diagnosis methods for hydraulic disc brakes and rotating machinery. Urbanization's impact on tunnel construction is investigated, focusing on the dynamic behavior of tunnel structures. Additionally, the issue presents innovative approaches to energy harvesting, such as nonlinear gyromagnetic excitation piezoelectric superposition beam energy harvesters.

Through a synthesis of these articles, the issue paints a comprehensive picture of the latest advancements and challenges in mechanical engineering, structural dynamics, and related fields. From medical robotics to energy-efficient technologies, the research presented contributes to a deeper understanding of various phenomena and solutions within the realm of vibration, control, diagnosis, and structural behavior. The insights offered in this issue have practical implications for engineering design, system optimization, and ensuring the safety and performance of mechanical systems in diverse applications.

Minvydas Ragulskis
Prof. Dr. Minvydas Ragulskis
Kaunas University of Technology, Lithuania, Editor in Chief
August 2023, Pages (825-1039)