Dissertation > Excellent graduate degree dissertation topics show

Study Ultrasonic in the Cleaning Technology

Author: MaKun
Tutor: ZhangQingFan
School: Shandong University
Course: Control Theory and Control Engineering
Keywords: Ultrasonic cleaning technology Ultrasonic generator Main circuit research Matching network Automatic frequency tracking The Digital PWM signal generator
CLC: TB490
Type: Master's thesis
Year: 2008
Downloads: 517
Quote: 4
Read: Download Dissertation

Abstract

Ultrasound technology in the early twentieth century, for nearly a century, the development of ultrasound technology is one of the most active part of the acoustic development, and now it has penetrated into the building of national defense, national economy and people's lives, and science and technology and other fields. Ultrasonic cleaning technology has also been a wide range of development, compared to a variety of other cleaning, ultrasonic cleaning showed great superiority. Ultrasonic cleaning machines, high efficiency and high cleanliness, thanks to the penetration and cavitation shock wave generated by the acoustic wave propagation in the medium, so it is easy to clean parts with complex shapes and cavities and pores . The physical mechanism of ultrasonic cleaning ultrasonic cavitation, so to achieve good results must choose the acoustic parameters and the physical and chemical properties of the cleaning agent. Sound intensity, the higher, more intense cavitation, but the sound intensity reaches a certain value, the cavitation becomes saturated. Ultrasonic cleaning machine ultrasonic generator and ultrasonic transducer, this article focuses on the ultrasonic generator. Contents of this article covers the following aspects: 1, the main loop of the study include: the protection of the inverter main circuit, switch, power tube drive and high-frequency transformer design, that is, the input circuit (including the input protection circuit, rectifier filter circuit) The half-bridge inverter circuit (ultrasound frequency circuit) and the matching circuit (inductance matching). The main circuit design can meet produce ultrasonic frequency signal and the best match the requirements of the protection of the generator in the power grid voltage is too big or too small input. The half-bridge inverter drive circuit design used in this paper is the IR integrated half-bridge drive IR21844. Drive transformer can be avoided with this method is designed to simplify the design step, at the same time can reduce component cost savings. Transducer electrical end matching network research: This article describes several common matching network, and select the inductor matching network according to actual requirements. Design matching the inductance parameter, the application impedance analyzer accurate measurement of the cleaning bath (a load (cleaning solution) when the electrical parameters of the equivalent circuit with the transducer), and calculated according to the mathematical derivation of the matching inductor Evaluate Formula matching inductor sense of value. 3, to achieve automatic control of the frequency tracking circuit: this article uses a digital phase locked loop method, the use of integrated digital PLL CD4046 and fewer separate components constitute a phase-locked circuit, thereby improving the reliability of the automatic frequency tracking. 4, digital PWM signal generator research design: using direct digital frequency synthesis (DDS) as a signal generator, DDS technology is applied to the signal source can greatly improve the resolution of the source to reduce costs, reduce the size.

Related Dissertations

CLC: > Industrial Technology > General industrial technology > Industrial common technology and equipment > Factory, workshop
© 2012 www.DissertationTopic.Net Mobile