• Title/Summary/Keyword: ultrasonic process

Search Result 676, Processing Time 0.024 seconds

Surface Flatness Improvement in Si Anisotropy Etching Process Utilizing Ultrasonic Wave Technology (초음파 기술을 이용한 실리콘 이방성 식각 공정에서의 표면 평탄화 향상 연구)

  • Yun, Eui-Jung;Kim, Jwa-Yeon;Lee, Kang-Won;Lee, Seok-Tae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2005.07a
    • /
    • pp.416-417
    • /
    • 2005
  • In this study, we optimized the process of Si anisotropy etching by combing tetramethyl ammonium hydroxide (TMAH) etching process with ultrasonic wave technology. New ultrasonic TMAH etching apparatus was developed and it was used for fabricating a $20{\mu}m$ thick diaphragm for Si piezoresistive pressure sensors. Based on comparison study on etch rate and surface flatness, it was observed that the Si anisotropy etching methode with new ultrasonic TMAH etching apparatus (at 40 kHz/ 500 watt) was superior to conventional etching methods with TMAH or TMAH+ammonium persulfate(AP) solutions.

  • PDF

An analysis of cutting process with ultrasonic vibration by ARMA model (자동회귀-이동평균(ARMA) 모델에 의한 초음파 진동 절삭 공정의 해석)

  • I.H. Choe;Kim, J.D.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.11 no.2
    • /
    • pp.85-94
    • /
    • 1994
  • The cutting mechanism of ultrasonic vibration machining is characterized as two phases, that is, an impact at the cutting edge and a reduction of cutting force due to non-contact interval between tool and workpiece. In this paper, in order to identify cutting dynamics of a system with ultrasonically vibrated cutting tool, an ARMA modeling is performed on experimental cutting force signals which have a dominant effect on cutting dynamics. The aim of this study is, through Dynamic Date System methodology, to find the inherent characteristics of an ultrasonic vibration cutting process by considering natural frequency and damping coefficient. Surface roughness and stability of cutting process under ultrasonic vibration are also considered

  • PDF

Optimization of Electro-UV-Ultrasonic Complex Process for E. coli Disinfection using Box-Behnken Experiment (Box-Behnken법을 이용한 E. coli 소독에서 전기-UV-초음파 복합 공정의 최적화)

  • Kim, Dong-Seog;Park, Young-Seek
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.33 no.3
    • /
    • pp.149-156
    • /
    • 2011
  • This experimental design and response surface methodology (RSM) have been applied to the investigation of the electro-UV-ultrasonic complex process for the disinfection of E. coli in the water. The disinfection reactions of electro-UV-ultrasonic process were mathematically described as a function of parameters power of electrolysis ($X_1$), UV ($X_2$), and ultrasonic process ($X_3$) being modeled by use of the Box-Behnken technique, which was used for fitting 2nd order response surface model. The application of RSM yielded the following regression equation, which is empirical relationship between the residual E. coli number (Ln CFU) in water and test variables in coded unit: residual E. coli number (Ln CFU) = 23.69 - 3.75 Electrolysis - 0.67 UV - 0.26 Ultrasonic - 0.16 Electrolysis UV + 0.05 Electrolysis Ultrasonic + 0.27 $Electrolysis^2$ + 0.14 $UV^2$ - 0.01 $Ultrasonic^2$). The model predictions agreed well with the experimentally observed result ($R^2$ = 0.983). Graphical 2D contour and 3D response surface plots were used to locate the optimum range. The estimated ridge of maximum response and optimal conditions for residual E. coli number (Ln CFU) using 'numerical optimization' of Design-Expert software were 1.47 Ln CFU/L and 6.94 W of electrolysis, 6.72 W of UV and 14.23 W of ultrasonic process. This study clearly showed that response surface methodology was one of the suitable methods to optimize the operating conditions and minimize the residual E. coli number of the complex disinfection.

In-process Weld Quality Monitoring by the Multi-layer Perceptron Neural Network in Ultrasonic Metal Welding (초음파 금속용접 시 다층 퍼셉트론 뉴럴 네트워크를 이용한 용접품질의 In-process 모니터링)

  • Shahid, Muhammad Bilal;Park, Dong-Sam
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.21 no.6
    • /
    • pp.89-97
    • /
    • 2022
  • Ultrasonic metal welding has been widely used for joining lithium-ion battery tabs. Weld quality monitoring has been an important issue in lithium-ion battery manufacturing. This study focuses on the weld quality monitoring in ultrasonic metal welding with the longitudinal-torsional vibration mode horn developed newly. As the quality of ultrasonic welding depends on welding parameters like pressure, time, and amplitude, the suitable values of these parameters were selected for experimentation. The welds were tested via tensile testing machine and weld strengths were investigated. The dataset collected for performance test was used to train the multi-layer perceptron neural network. The three layer neural network was used for the study and the optimum number of neurons in the first and second hidden layers were selected based on performances of each models. The best models were selected for the horn and then tested to see their performances on an unseen dataset. The neural network models for the longitudinal-torsional mode horn attained test accuracy of 90%. This result implies that proposed models has potential for the weld quality monitoring.

Research on Ultrasonic Sterilization Effect of Treatment Equipments (초음파 처리조의 구조에 따른 살균효과 연구)

  • Lee, Yanglae;Kim, Hyunse;Baek, Minhyuck
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.22 no.5
    • /
    • pp.818-823
    • /
    • 2013
  • In the process of sterilization during the manufacture of beverages, both the treatment time and the temperature influence the beverage taste and flavor. Therefore, to improve the beverage quality, a nonthermal sterilization method is preferred to a high-temperature one. A nonthermal method, ultrasonic treatment by shock waves from cavitation, has been known to have a sterilizing effect. In this study, to observe the effect of ultrasonic frequency and treatment time on beverage quality, batch type ultrasonic equipment was fabricated and tested. Further, to evaluate the applicability of this ultrasonic method to an in-situ process, flow type ultrasonic heptagonal equipment was fabricated and then used to perform a sterilization experiment. Subsequently, the sterilizing effect was measured under ultrasonic and low-temperature ($55^{\circ}C$) treatments. Based on the obtained results, ultrasonic sterilization technology that can be applied for treatments at flow rates of up to 3 L/min was developed.

Investigation for Optimization of Ultrasonic Soil-Washing Process for Remediation of Diesel Contaminated Soil (유류오염토양의 복원을 위한 초음파 토양세척 공정의 최적화에 대한 연구)

  • Park, Beom-Guk;Son, Young-Gyu;Hwang, An-Na;Khim, Jee-Hyeong
    • Journal of the Korean Society of Hazard Mitigation
    • /
    • v.11 no.1
    • /
    • pp.101-105
    • /
    • 2011
  • Determination of ultrasonic frequency and experimental design approach to optimization of ultrasonic soil-washing process for remediation of diesel contaminated soil were investigated. Ultrasonic frequencies of 35, 72, and 100 kHz were used for determination of optimal frequency. $MINITAB^{(R)}$ program was used for experimental design of optimal washing condition. The optimal ultrasonic frequency was 35 kHz. Even though the number of cavitation bubble is little, however cavitation bubbles involving larger energy compared with high frequency was generated. Therefore, the removal efficiency at low frequency was higher than at high frequency. However the input energy has to be considered when the process is applied. The statistical tests from a factorial experiment shows that the application of ultrasound and mechanical mixing are the most important factor for design of an ultrasonic soil washing process. The lab-scale experiments are required to get the optimal condition of ultrasound and mechanical mixing for application of ultrasonic soil washing process.

Characteristics of High-Aspect-Ratio Ultrasonic Machining of Glass (초음파에 의한 고 세장비 유리가공 특성)

  • 신용주;김헌영;장인배;김병희;전병희
    • Transactions of Materials Processing
    • /
    • v.11 no.7
    • /
    • pp.608-613
    • /
    • 2002
  • An ultrasonic machining process is efficient and economical means for precision machining of glass and ceramic materials. However, the mechanism of the process with respect to the crack initiation and propagation and the stress development in the ceramic workpiece subsurface arc still not well understood. In this research, we have investigated the basic mechanism of ultrasonic machining of ultrasonic machining of glass by the experimental approach. For this purpose, we designed and fabricated the desktop micro ultrasonic machine. The feed is controlled precisely by using the constant load control system. During machining experiments, the effects of abrasive characteristics and machining conditions on the surface roughness and the material removal rate are measured and compared.

Evaluation of Laser-based Ultrasonic Signals due to Fiber Orientation of CFRP (CFRP의 섬유강화재 배향성에 따른 레이저유도초음파 신호특성 평가)

  • Choi Sang-Woo;Lee Joon-Hyun;Byun Joon-Hyung;Seo Kyeong-Cheol
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • 2004.04a
    • /
    • pp.143-146
    • /
    • 2004
  • Fiber reinforced plastic material should be inspected in fabrication process in order to enhance quality by prevent defects such as delamination and void. Generally, ultrasonic technique is widely used to evaluate FRP. In conventional ultrasonic techniques, transducer should be contacted on FRP. However, conventional contacting method could not be applied in fabrication process and novel non-contact evaluating technique was required. Laser-based ultrasonic technique was tried to evaluate FRP plate. Laser-based ultrasonic waves propagated on CFRP were received with various transducers such as accelerometer and AE sensor in order to evaluated the properties of waves due to the variation of frequency. Velocities of laser-based ultrasonic waves were evaluated for various fiber orientation.

  • PDF

A Experimental Study on the Ultrasonic Influence for Melting the Paraffin the Ice (초음파가 얼음과 파라핀 용해에 미치는 영향에 관한 실험적 연구)

  • 이재효;김태훈
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.13 no.11
    • /
    • pp.1106-1113
    • /
    • 2001
  • This paper presents experimental works on the ultrasonic influence during melting of ice and paraffin and compared the paraffin's result with ice's results. The experiments was carried out under two setting conditions.: 1) Heater without ultrasonic vibration, 2) heater with ultrasonic vibration. Experimental observations show that the ultrasonic vibration enhances significantly the phase-change process (melting) so that the melting time is reduced about 16∼25% compared to those of molting process without ultrasonics in the melting of both ice and paraffin. But the influence of ultrasonics was not significant to affect the reduction of the power consumption. In the case of paraffin, the reduction rate of power consumption was about 20%, but the reduction of the power consumption was increased about 0∼12%.

  • PDF