12博

Journal of Guidance, Control, and Dynamics, Ahead of Print.

The propagation nature of sonic waves in a temperature gradient field is often simplified with uniform temperature assumptions, resulting in compensation errors in ultrasonic-based oil film measurement. Focusing on this, a novel compensation method of inverting the temperature gradient via ultrasonic signal is proposed. For thrust bearings, the time shift of the reflected signal from the substrate-coating

Full-field three-dimensional (3D) displacement measurement is highly sought after for the mechanical design, assessment, and health monitoring of large structures. The emerging microwave displacement measurement technique provides the potential for wide-ranging full-field measurement capabilities; however, it still faces challenges in achieving full-field 3D displacement measurement. In this article

This paper proposes a new passive self-tuning vibration neutraliser, which contains a mass, a spring, a lever, a lever fulcrum and a passively self-tuning device. The mass and spring are connected to the two ends of the lever. The other end of the spring is attached to the primary structure. The effective stiffness and mass are dependent upon the position of the fulcrum, which is self-tuneable passively

Journal of Guidance, Control, and Dynamics, Ahead of Print.

Inspired by the biomechanics of human shoulder and elbow joints, this study proposes a novel 4-DOF human-inspired flexible mechanism (HIFM). The HIFM integrates a dual-mode operational characteristic that combines rigidity and flexibility, with a particular emphasis on its flexible mode, which significantly enhances the safety and stability of capturing non-cooperative targets. First, a dynamic model

Quasi-zero stiffness (QZS), a beneficial nonlinear feature, offers solutions like wide-bandwidth vibration isolation, energy harvesting, and adaptive shape-changing with multi-stability. However, high-end applications require QZS to be miniaturized, demanding compact size, lightweight, high durability, and low complexity. This paper introduces a groundbreaking nonlinear mechanical meta-structure, the

Optimization of systems of damped primary structures with tuned mass dampers (TMDs) remains a challenge for analytical methods to date. Due to the existence of the primary structure damping, the well-known fixed point theory is not directly applicable. This paper deals with this problem. First, it is found that there exist two so-called semi-fixed points of which the abscissas are independent of TMD’s

In this paper, the dynamic responses of a rotor-bearing system with an asymmetric shaft are studied, focusing on the effect of the shaft asymmetry on the dynamic response of the rotor-bearing system. The asymmetric shaft is modeled considering shear effect based on Timoshenko beam theory. Both one-sided and two-sided cuts are considered in the cross-section of the asymmetric shaft. Various positions

To improve the vibration attenuation performance of the all-terrain vehicles (ATVs) equipped with magnetorheological (MR) suspension with parameter uncertainty and time delay in the sensitive frequency band of human body, this study proposed a finite-frequency robust (FFR) H∞ control strategy. Firstly, a MR suspension model with seven degrees of freedom is established. The boundaries of parameter uncertainty

Journal of Guidance, Control, and Dynamics, Ahead of Print.