Design of High Precision Power Supply for Low-Frequency Vibration Cutting

2004 ◽  
Vol 471-472 ◽  
pp. 494-497
Author(s):  
X.G. Jiang ◽  
D.Y. Zhang
Keyword(s):  
Power Amplifier ◽  
High Precision ◽  
Frequency Band ◽  
Power Supply ◽  
High Stability ◽  
Low Frequency ◽  
Sine Wave ◽  
Vibration Cutting ◽  
Low Frequency Vibration ◽  
Small Band

The frequency of piezoelectric transducer requires high stability and can also be continuously changed. The voltage requires smooth and stable sine wave. To the two problems, a high precision power supply for vibration cutting is designed. It divides the whole frequency band into several small bands. By means of CPLD, the sine wave is digitally fitted individually at each small band. So the sine wave can be always suitable at a wide frequency band. At the power output, OCL power amplifier is adopted. The output sine voltage becomes smooth and stable by adding voltage negative feedback to the power amplifier. The experiment results show its feasibility.

Influence of low-frequency parameter changes on nonlinear vibro-acoustic wave modulations used for crack detection

2017 ◽  
Vol 17 (2) ◽  
pp. 218-226 ◽  
Author(s):  
Bin Liu ◽  
Zhiwei Luo ◽  
Tie Gang
Keyword(s):  
Crack Detection ◽  
Crack Opening ◽  
Low Frequency ◽  
Intensity Variation ◽  
Sine Wave ◽  
Dynamic Strain ◽  
Low Frequency Vibration ◽  
Test Parameters ◽  
Increased Sensitivity ◽  
Acoustic Modulation

The use of vibro-acoustic modulation is an effective nonlinear and nondestructive approach to the detection and monitoring of cracks in fatigued, defective, and fractured materials. However, the vibro-acoustic modulation results strongly depend on choice of the testing parameters. To implement this technique for additional applications, the effect of variation in the test parameters must be well understood. This study investigates the influence of variation in the amplitude and frequency of pumping (low-frequency vibration) signals on the modulation. We apply two kinds of probing excitations, sine-wave and swept-signal excitations, and we measure the modulation intensity variation with changes in the relevant parameters to observe their influence on the modulations. Dynamic strain measurement of the crack area is utilized to analyze the relation between the degree of crack opening/closing and the modulation on the crack interface. The results indicate that the probing amplitude has little effect on the modulation, and furthermore, the sweep-signal excitation technique can be used to select the proper probing frequency. The results also indicate that there is a critical pumping strain value ( εc) for the crack samples. When the pumping strain reaches this critical value, the modulation reaches a maximum. However, the opening/closing area cannot increase any more even if the pumping amplitude further increases, and thus, the modulation does not change. The extent of the crack opening/closing also varies with the pumping frequency. Our results suggest that increased sensitivity to crack detection can be achieved with the use of the resonance frequency as the pumping frequency in vibro-acoustic modulation tests.

scholarly journals Influence on surface characteristics generated in Low Frequency Vibration Cutting

2020 ◽  
Vol 86 (892) ◽  
pp. 20-00323-20-00323
Author(s):  
Akihito MIYAKE ◽  
Ayako KITAKAZE ◽  
Seiko SAKURAI ◽  
Masahiro MURAMATSU ◽  
Kenji NOGUCHI ◽  
...  
Keyword(s):  
Low Frequency ◽  
Surface Characteristics ◽  
Vibration Cutting ◽  
Low Frequency Vibration

scholarly journals Study on machining of GFRP by low frequency vibration cutting

Seikei-Kakou ◽  
1991 ◽  
Vol 3 (1) ◽  
pp. 81-88
Author(s):  
Noboru IIJIMA ◽  
Hidehiko TAKEYAMA
Keyword(s):  
Low Frequency ◽  
Vibration Cutting ◽  
Low Frequency Vibration

Research Progress of Low-Frequency Vibration Cutting and Its Development Tendency

2010 ◽  
Vol 26-28 ◽  
pp. 648-652
Author(s):  
Qi Hong ◽  
Li Zhi Gu ◽  
Chun Jiang Xiang
Keyword(s):  
Manufacturing Process ◽  
Low Frequency ◽  
Research Progress ◽  
Advanced Manufacturing ◽  
Experiment Study ◽  
Vibration Cutting ◽  
Low Frequency Vibration ◽  
History Of ◽  
Cutting Operation ◽  
Development Tendency

Low-frequency vibration cutting is a new kind of advanced manufacturing process with several features of advantages, compared with conventional cutting operation. Based on the review of the history of low-frequency vibration cutting, its special technological effects and applications were discussed, and presented in detail the research progress in mechanism and experiment study on low-frequency vibration cutting. Three primary problems, lack of unified awareness of mechanism, establishment of a unified standard for the choice of certain parameters, application level, still in expertise for low-frequency vibration cutting were explored and the development tendency as well as the prospect of low-frequency vibration cutting in future was foreseen.

Preliminary Studies for Precision Polishing of Micro Structured Mold by Using Three-Dimensional Low Frequency Vibration Utilizing Piezoelectric Actuator Incorporated with Mechanical Amplitude Magnified Mechanism

2012 ◽  
Vol 565 ◽  
pp. 231-236 ◽  
Author(s):  
Sze Keat Chee ◽  
Hirofumi Suzuki ◽  
Junichi Uehara ◽  
Takeshi Yano ◽  
Toshiro Higuchi
Keyword(s):  
Piezoelectric Actuator ◽  
Control Method ◽  
Three Dimensional ◽  
Low Frequency ◽  
Sine Wave ◽  
Work Piece ◽  
Time Control ◽  
Low Frequency Vibration ◽  
Increasing Demand ◽  
Polishing Tool

Precision polishing of micro structured mold has been highly demanded due to the increasing demand for optics manufacturing such as solar optics and DVD pick-up system, and medical devices like μ-TAS [1-5]. These micro structured molds usually have complicated structure and need to be polished after grinding or cutting. In this paper, a three-axis low frequency vibration (3DLFV) polishing actuator is proposed. The actuator consists of 3 multilayers-stacked piezoelectric actuators (PZT) incorporated with mechanical amplitude magnified mechanism. The mechanical amplitude magnified mechanism utilizes mechanical structures which is also called mechanical transformer, which is capable to elongate the stroke of the piezoelectric actuator to almost 13 times to 225 m. By driving the PZT in sine wave with particular phase different, dual direction trajectory such as circle can be achieved, and is proved to be effective in precision mold polishing [8]. With the 3DLFV actuations, polishing tool with polyurethane is actuated to stir the diamond slurry to achieve polishing effects. In polishing experiments, nickel-plating metal used as work pieces are polished with diamond slurry and the polished depths are measured. As a result, three-axis low frequency vibration (3DLFV) is proposed and developed. Its capability in polishing precise mold is studied and confirmed to be efficient. In order to improve the work piece surface, a dwell time control method can be applied with the 3DLFV.

A single and double slotting radial acoustic metamaterial plate

2017 ◽  
Vol 31 (12) ◽  
pp. 1750128
Author(s):  
Nansha Gao ◽  
Hong Hou ◽  
Hang Xin
Keyword(s):  
Frequency Band ◽  
Rational Design ◽  
Low Frequency ◽  
Band Gaps ◽  
Acoustic Properties ◽  
Coupling Mechanism ◽  
Displacement Fields ◽  
Acoustic Metamaterial ◽  
Low Frequency Vibration ◽  
Calculation Results

This paper presents the low-frequency acoustic properties of a new single and double slotting radial acoustic metamaterial plate which is arranged in the axial coordinate. The band structures, transmission spectra, and eigenmode displacement fields of this kind of acoustic metamaterial are different from previous studies. Numerical calculation results show that the first-order band gap (BG) of the radial flexible elastic metamaterial plate is below 200 Hz. A multiple-vibration coupling mechanism is proposed to explain the low-frequency band gaps. By changing the geometric parameters a, t, and g, the location and width of the low-frequency band gaps can be varied neatly. In summary, rational design of geometries and materials is the crucial pathway to open and lower BGs, and could restrain low-frequency vibration similarly. This can be used to protect infrasound, generate filters, and design acoustic devices.

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