Results 41 to 50 of about 434 (175)

A vibration control method for chatter mitigation in milling process based on sliding mode control and reinforcement learning

Scientific Reports
Chatter is a self-excited vibration phenomenon that limits the productivity, surface quality and tool life of milling operations. In this study, an active chatter mitigation strategy is proposed by integrating sliding mode control (SMC) with ...
Satyam Paul
doaj   +1 more source

Fundamental Investigation of the Application Behavior and Stabilization Potential of Milling Tools with Structured Flank Faces on the Minor Cutting Edges

Journal of Manufacturing and Materials Processing
In milling processes in which material removal is performed periodically from solid material, dynamic effects are generally considered to be responsible for instabilities and subsequent productivity limits.
Raphael Isaak Elias Schönecker, Jonas Baumann, Rafael Garcia Carballo, Dirk Biermann   +3 more
doaj   +1 more source

Self-Excited Vibrations Counteraction in Machine Tool — Cutting Process System Using Controllable Eliminator of Vibration

Engineering Transactions, 2006
In the paper, the results of simulation investigations on the application of a semi-active vibration eliminator for suppression of machining chatter are presented.
Marcin Chodźko, Krzysztof Marchelek, Arkadiusz Parus   +2 more
doaj   +1 more source

AI‐enabled bumpless transfer control strategy for legged robot with hybrid energy storage system

CAAI Transactions on Intelligence Technology, EarlyView.
Abstract Designing Hybrid energy storage system (HESS) for a legged robot is significant to improve the motion performance and energy efficiency of the robot. However, switching between the driving mode and regenerative braking mode in the HESS may generate a torque bump, which has brought significant challenges to the stability of the robot locomotion.
Zhiwu Huang, Zi Yu, Hui Peng, Zixuan Wang, Xiaokang Dai, Weirong Liu, Jing Wang   +6 more
wiley   +1 more source

A Rapid Method to Quantify High-Frequency-Dominant Signals Based on Fixed-Interval Fractal Dimension

Fractal and Fractional
The fractal dimension (FD) is an effective indicator to characterize various signals in engineering. However, the FD is nearly twice that of its maximum value when examining high-frequency-dominant signals, such as those in milling chatter.
Feng Feng, Xinguo Song, Yu Zhang, Zhen Zhu, Heng Wu, Pingfa Feng   +5 more
doaj   +1 more source

The choice to submit: freedom, gender, and the figure of God in Pentecostal Nigeria Le choix de se soumettre : liberté, genre et figure divine chez les Pentecôtistes du Nigeria

Journal of the Royal Anthropological Institute, EarlyView.
Why do some women choose to submit to their husbands in marriage? In anthropology, the paradox of ‘chosen submission’ has famously been explored by Saba Mahmood. Her work amongst Egyptian women donning the veil in the Islamic da'wa movement spotlights the notion of ‘piety’ to explore how devotion to God can act as a powerful motivator of human ...
Naomi Richman
wiley   +1 more source

Design of eddy current dampers for vibration suppression in robotic milling

Advances in Mechanical Engineering, 2018
The milling robot normally has a low stiffness which may easily cause chatter during machining. This article presents a novel eddy current damper design for chatter suppression in the robotic milling process.
Fan Chen, Huan Zhao
doaj   +1 more source

Influence of Damping Interface Materials on Vibroacoustic Behavior and Surface Quality in Hard Turning Operations [PDF]

JES: Journal of Engineering Sciences
This study examines whether damping interface materials can reduce vibrations and improve surface finish during hard machining. Experiments were run using standard steel tooling alongside four alternative interface materials: epoxy granite composite ...
Walid Shewakh, Majed Moosa
doaj   +1 more source

Cardiovascular Plasticity and Adaptation of High‐Altitude Birds and Mammals

Integrative Zoology, EarlyView.
This schematic depicts the cardiovascular adaptations of mammals and birds to high‐altitude hypoxia. It highlights key phenotypic changes in oxygen transport and cardiac responses, driven by molecular mechanisms including transcriptional regulation and genetic modifications.
Huishang She, Yanhua Qu
wiley   +1 more source

Comparative Genomics and Functional Evidence for Convergent Adaptation to Hypoxia in Mammals

Integrative Zoology, EarlyView.
This study reveals convergent selection in mammals adapted to hypoxia. Functional assays demonstrate that amino acid mutations reduce oxidative stress, attenuate hypoxia‐induced injury, and modulate the hypoxia‐inducible transcription factor (HIF)‐driven hypoxic response.
Hao Dong, Chunxu Wang, Enqing Pei, Liang Zhao, Simin Chai, Ran Tian   +5 more
wiley   +1 more source