Abstract Very early bolt looseness monitoring has been a challenge in the field of structural health monitoring. The authors have conducted further study previous researches, with aim detecting very conditions. intrinsic features vibro-acoustic signals contain underlying dynamic characteristics denoting full range Correspondingly, this paper proposes novel ResNet-integrated approach based on feature extraction percussion sounds. percussion-caused sound were extracted by variational mode...

No AccessEngineering NoteAdaptive Suppression of Linear Structural Vibration Using Control Moment GyroscopesQuan Hu, Yinghong Jia and Shijie XuQuan HuSchool Astronautics, Beihang University, 100191 Beijing, People's Republic China, JiaSchool China XuSchool ChinaPublished Online:25 Apr 2014https://doi.org/10.2514/1.62267SectionsRead Now ToolsAdd to favoritesDownload citationTrack citations About References [1] D'Eleuterio G. M. T. Hughes P. C., "Dynamics Gyroelastic Continua," Journal Applied...

Abstract Rolling bearings play a crucial role as components in mechanical equipment. Malfunctioning rolling can disrupt the normal operation of equipment and pose safety hazards. Traditional deep learning-based methods for diagnosing faults present several issues, such insufficient feature information fault samples, high model complexity low accuracy. To overcome these challenges, this paper introduces an intelligent approach bearing diagnosis using intrinsic extraction convolutional block...

This work studies the maneuver control and vibration suppression of a flexible free-flying space robot using variable-speed moment gyros as actuators. A novel manipulator is designed. The dynamics multibody system derived by Kane method. Based on singular perturbation approach, decoupled into slow subsystem fast subsystem. associated with rigid motion dynamics, related to link dynamics. composite strategy proposed combination two controllers for these subsystems. An adaptive sliding mode...

The power-to-gas (P2G) technology—a promising way to connect power and gas networks—will be widely used in the power-gas-heating integrated system (PGHIS) promote its operational flexibility. However, higher costs will affect application of P2G on PGHIS scheduling, which cannot ignored. In this paper, a scheduling model considering cost wind utilization is proposed analyze impact characteristics. First, including introduced, different kinds are clarified capture characteristics P2G. Then,...

Damage to tunnel lining significantly influences the stability of tunnels during operation, particularly under conditions extra-high ground stress. This article investigates linings subjected stress, providing an in-depth analysis crack damage modes. A time-varying reliability model based on structural performance function is proposed, which incorporates effects plastic zone and identified The distribution surrounding rock stress field throughout excavation process were simulated,...

Vanillylmandelic acid (VMA) and homovanillic (HVA) are biomarkers for the diagnosis course-of-disease monitoring of malignant tumor neuroblastomas, which endanger infants children.

This paper presents a comprehensive recursive formulation of dynamic equations for multibody systems with variable-speed control moment gyroscopes. It permits any rigid or flexible body in the system to have cluster gyroscopes generic configuration as actuators. The detailed dynamics actuators is taken into consideration capture its interactions flexibilities structures. algorithm obtained through analyzing kinematics and between two adjacent bodies, both which can be flexible, one other...

Abstract Bolt-ball joints are widely used in space structures, and their looseness may lead to major safety accidents. The current bolt monitoring methods based on deep learning usually have high computational complexity, it is difficult guarantee its efficiency under practical scenario. To mitigate this problem, here paper, an efficient robotic-assisted bolt-ball joint approach using convolutional block attention module (CBAM)-enhanced lightweight ResNet proposed. Firstly, the tapping...

The attitude-tracking control of a rigid spacecraft using only two internal torques is addressed. First, given reference trajectory classified as feasible or unfeasible according to the preservation violation momentum conservation law. dynamics error then formulated on attitude manifold SO(3) with angular actuators inputs. Given Lie group structure SO(3), transverse function approach utilized design an law ensuring asymptotically ultimately bounded tracking for any trajectory. For...

A flexible body with a distribution of stored angular momentum is viewed as gyroelastic body. The structure may require active vibration suppression, which can be controlled using collection control moment gyroscopes. This study investigates the optimal placement collocated rate sensors and gyroscope actuators for constrained based on genetic algorithms. First, dynamics modal analysis are presented. state-space model adopted that contains sensors. Based concept controllability observability...