Results 71 to 80 of about 1,031 (236)

Detection of Chatter in Machining Processes by the Multiscale Maximum Approximate Entropy and Continuous Wavelet Transform

Applied Mechanics
Chatter is a complex dynamic instability in machining processes and presents nonlinear and nonstationary behavior. Detection of this phenomenon before a catastrophic failure occurs has great importance in the industry today.
Daniel Pérez-Canales, Juan Carlos Jáuregui-Correa, José Álvarez-Ramírez, Luciano Vela-Martínez   +3 more
doaj   +1 more source

PID‐Like Robust Control of Non‐Minimum Phase Robotic Manipulators

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT This paper proposes an output‐feedback tracking controller for non‐minimum phase nonlinear systems with unknown uncertainties and external disturbances, where not all states are measurable, and the zero dynamics are unstable. The approach combines a backstepping‐based stabilizing state‐feedback law with a cascade extended high‐gain observer ...
Mohammad Al Saaideh, Almuatazbellah Boker, Mohammad Al Janaideh   +2 more
wiley   +1 more source

Neural Network‐Based Adaptive Super‐Twisting Control for Perturbed Nonlinear Systems: Lyapunov Design

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT A newly developed robust control strategy based on an adaptive neural network (ANN) estimator performed in concert with adaptive super‐twisting (ASTW) control is presented. The proposed adaptive robust control algorithm is applied to a class of perturbed nonlinear systems and features a significantly decreased control gain with respect to the ...
Mohammad Javad Mirzaei, Mohamed Assaad Hamida, Yuri Shtessel, Franck Plestan   +3 more
wiley   +1 more source

Frequency‐Domain Analysis of External Signal Propagation Through Sliding Mode Control Systems With Dynamic Actuators

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT The importance of frequency domain methods in analysis and design of sliding mode (SM) control systems is mostly associated with chattering, where the advantages of these methods over state‐space and Lyapunov's methods are quite obvious.
I. M. Boiko
wiley   +1 more source

Key Technical Fields and Future Outlooks of Space Manipulators: A Survey

SmartBot, EarlyView.
This paper systematically reviews the technological development of space manipulators, emphasizing the unique challenges posed by space environments. It examines four areas: structural design, modeling, planning, and control, while introducing typical ground test platforms.
Gang Chen, Zeyuan Huang, Ying Yan, Xiaokang An, Zhikai Zhao, Jirong Lin, Xiangrong Zhao, Xianyuan Gao, Junyi Zong, Xuewen Jia, Zhipeng Yao, Jianliang Liao, Ning Ji   +12 more
wiley   +1 more source

The Trajectory of an Agreement: Tracing Objectivated Knowledge Across a Series of Mundane Encounters

Symbolic Interaction, EarlyView.
This article adds to the sociological study of time and temporality in everyday life by building on recent longitudinal developments within conversation analysis. It investigates members' methods to bring about change within their shared (life) world. It examines how, as part of an extended project of action, one agreement made early on is continually ...
Sarah Hitzler, Jonas Kramer
wiley   +1 more source

Transfer learning methods for Three-Axis CNC anomaly detection [PDF]

Advanced Manufacturing
Transfer learning is a machine learning method used to train a network using prior knowledge from a source network. This method has been applied for anomaly detection in CNC machines to detect anomalies such as chatter.
Eugene Li, Yang Li, Sasank Kakarla, William Melek, Sanjeev Bedi   +4 more
doaj   +1 more source

Detection of Regenerative Chatter Vibrations of Turning Workpiece.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C, 1993
In this paper, we propose a new method of detecting regenerative chatter of turning workpiece by using spectrum of vibration of the workpiece. Characteristics of vibrations of the workpiece during cutting was investigated first, and then algorithm of detection was thought out from the investigated results.
Eiji Kondo, Hiroshi Ota, Tadao Kawai
openaire   +2 more sources

Suitable habitat of Himalayan wolf in Upper Mustang, Annapurna Conservation Area, Nepal

Wildlife Biology, EarlyView.
Decades ago, the Himalayan wolf Canis lupus chanco, a genetically distinct sub‐species of the gray wolf Canis lupus, faced persecution by local communities in the Nepalese Himalayas. Recently, wolf populations have returned and recolonized, sparking concerns about conflicts over livestock depredation, and emphasizing the urgent need for comprehensive ...
Deu Bahadur Rana, Jhamak Bahadur Karki, HimLal Shrestha, Thakur Silwal, Bikash Ghimire, Bikram Shrestha   +5 more
wiley   +1 more source

An effective investigation of chatter prediction system on Al6061 alloy in an end milling process

Journal of Engineering and Applied Science
Visual examination of the surface topography, in conjunction with the other sensors, may confirm the existence of chatter. Online chatter detection during real machining operations is possible with the use of sensors, and the presence of noise in their ...
Trivikrama Raju C, Jakeer Hussain S, Yedukondalu G, Murahari Kolli   +3 more
doaj   +1 more source