Author
Deqing Mei
Bio: Deqing Mei is an academic researcher from Zhejiang University. The author has contributed to research in topics: Magnetorheological fluid & Elevator. The author has an hindex of 6, co-authored 11 publications receiving 511 citations.
Papers
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TL;DR: A intelligent recognition system, composed of the feature extraction and the SVM, has an accuracy rate of 95% for the identification of stable, transition and chatter state after being trained by the experiment data.
220 citations
TL;DR: In this paper, a kind of micro/meso sheet soft punch stamping process to fabricated micro channels is investigated via numerical simulations and experiments, where plane strain finite element analysis (FEA) models of different channel geometry are established to analyze the significant parameters associated with this process.
113 citations
TL;DR: In this article, an innovative chatter suppression method based on a magnetorheological (MR) fluid-controlled boring bar for chatter suppression is developed, which changes stiffness and undergoes a phase transformation when subjected to an external magnetic field, is applied to adjust the stiffness of the boring bar and suppress chatter.
111 citations
TL;DR: In this article, the effect of parametric excitation on self-excited vibration was investigated based on a model of a van der Pol-Mathieu-Duffing oscillator with a time delay.
43 citations
TL;DR: In this paper, an innovative chatter suppression method based on a magnetorheological (MR) fluid-controlled boring bar for chatter suppression is developed, which can change stiffness consecutively by varying the strength of the applied magnetic field, was applied to adjust the stiffness of the boring bar and suppress chatter.
Abstract: An innovative chatter suppression method based on a magnetorheological (MR) fluid-controlled boring bar for chatter suppression is developed. The MR fluid, which can change stiffness consecutively by varying the strength of the applied magnetic field, was applied to adjust the stiffness of the boring bar and suppress chatter. The cutting dynamic stability under different natural frequencies of the structure was analyzed by an energy method, which shows that cutting dynamic stability depends on both the natural frequency of the structure and the spindle speed. The chatter suppression mechanism with varying natural frequency is analyzed for further parameter optimization. Furthermore, both theoretical analyses and numerical simulations indicate that a square wave exciting current with a large amplitude and a moderate frequency has a better effect on regenerative chatter suppression. Experiments utilizing a MR fluid-controlled boring bar under an exciting current with different waveforms and frequencies were conducted. The experimental results show that the chatter can be significantly suppressed using MR fluid-controlled boring bar under a square wave exciting current with a frequency of 4–6 Hz and an amplitude of 0–2 A.
38 citations
Cited by
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TL;DR: A review of the state of research on the chatter problem and classifications the existing methods developed to ensure stable cutting into those that use the lobbing effect, out-of-process or in-process, and those that, passively or actively, modify the system behavior as mentioned in this paper.
Abstract: Chatter is a self-excited vibration that can occur during machining operations and become a common limitation to productivity and part quality. For this reason, it has been a topic of industrial and academic interest in the manufacturing sector for many years. A great deal of research has been carried out since the late 1950s to solve the chatter problem. Researchers have studied how to detect, identify, avoid, prevent, reduce, control, or suppress chatter. This paper reviews the state of research on the chatter problem and classifies the existing methods developed to ensure stable cutting into those that use the lobbing effect, out-of-process or in-process, and those that, passively or actively, modify the system behaviour.
790 citations
TL;DR: A critical review of the different chatter suppression techniques can be found in this paper, where the evolution of each technique is described remarking the most important milestones in research and the corresponding industrial application.
454 citations
TL;DR: A path-breaking concept is proposed to harvest the significant benefits of acoustic levitation in air by allowing continuous planar transport and processing of multiple objects, from near-spherical to wire-like, without being limited by the acoustic wavelength.
Abstract: An ultrasonic manipulation apparatus to move objects (41; 42; 45) comprising a host fluid as acoustic medium and the object(s) to be moved, wherein a plurality of ultrasonic wave oscillators is arranged in at least one line. The wave oscillators are connected to a control unit (50) adapted to generate control signals (51, 52) for the wave oscillators (21, 22) to generate a gradient force by superposing one over another the gradient force fields generated by ultrasonic waves produced by the wave oscillators. Drive signals for two adjacent wave oscillators have amplitudes of the sinusoidal inputs for these two adjacent wave oscillators which maintain an essentially constant acoustic potential magnitude during transition of an object between these two wave oscillators (21, 22).
268 citations
TL;DR: In this paper, a comprehensive review of the current researches being carried out on the metallic and composite bipolar plates, covering materials and fabrication methods, is presented, and the phenomenon of ionic contamination due to the release of the corrosion products of metallic bipolar plates and relative impact on the durability as well as performance of PEM fuel cells is extensively investigated.
247 citations
TL;DR: A intelligent recognition system, composed of the feature extraction and the SVM, has an accuracy rate of 95% for the identification of stable, transition and chatter state after being trained by the experiment data.
220 citations