Abstract This paper presents a method to analyze the free vibration of a rotating disk–spindle system in a HDD with hydrodynamic bearings (HDBs) considering the flexibility of a complicated base structure by using finite element method. Finite element equations of each component of a HDD spindle system from the spinning flexible disk to the flexible base plate are consistently derived by satisf...

This paper presents the application of iSight for optimal tip design of complex tool holder spindle. The complex tool holder is used for holding a (milling/drilling) tool of a machine tool. The engineering problem of complex tool holder results from the twisting of spindle of tool holder. This leads to the vibration of tool holder which makes the tool holder malfunction. This engineering proble...

In humans, tendon vibration evokes illusory sensation of movement. We developed a model mimicking the muscle afferent patterns corresponding to any two-dimensional movement and checked its validity by inducing writing illusory movements through specific sets of muscle vibrators. Three kinds of illusory movements were compared. The first was induced by vibration patterns copying the responses of...

Green CNC drilling is a machining process where deionised water, tap water and dry air are used as coolant to increase the efficiency, quality of product reduce harmful industrial waste (solid gaseous). In this research paper, GRA TOPSIS with PCA method optimized multiple response parameters green on HcHcr using HSS twist drill bit. The work considered point angle, spindle speeds, diameters fee...

(Association Française de Lutte contre les Myopathies).ABSTRACT In humans, tendon vibration evokes illusory sensation of movement. We developed a model mimicking the muscle afferent patterns corresponding to any two-dimensional movement and checked its validity by inducing writing illusory movements through specific sets of muscle vibrators. Three kinds of illusory movements were compared. The ...

This study aims to conduct abnormality detection by applying machine learning algorithms when drilling a carbon fiber reinforced plastic laminate. In-process signals including current, thrust force, and vibration were captured during the dry experiments using 6 mm physical vapor deposit diamond-coated drill at consistent spindle speed of 6500 RPM 0.05 mm/rev. Across measurements from out-of-pro...

During voluntary contraction, firing rates of individual motor units (MUs) increase modestly over a narrow force range beyond which little additional increase in firing rate is seen. Such saturation of MU discharge may be a consequence of extrinsic factors that limit net synaptic excitation acting on motor neurons (MNs) or may be due to intrinsic properties of the MNs. Two sets of experiments i...

Wavelet Denoising and Local Mean Decomposition (WDLMD) decompose the vibration signals obtained experimentally into Product Functions (PFs). The most important PFs that reveal chatter information are chosen from among these. These well-known combined to create a signal depicts real-time discourse. Following prediction model for Chatter Index (CI) was established utilising reconstructed signal. ...