The Optimum Design Of The Ultrasonic Horn And The Analysis Of The Acoustical Characteristic

Ultrasonic horn is one of the most important parts in the ultrasonic oscillation, its primary effect in the oscillation system is to blow up the particle displacement and velocity in the mechanical vibrancy, centralize the ultrasonic energy on a lesser acreage. In the strongly sound intensity ultrasonic apply, such as in the application of ultrasonic machining and ultrasonic bonding, the vibration amplitude of the radiant surface generally needs from several decade to several hundred micron, we can magnify the mechanism vibration amplitude to this area, if we joint single-stage or multilevel ultrasonic horn. So, ultrasonic horn has very important function in the whole supersonic system, choosing its performance parameter will mighty impact the practical production. At present, there are many methods relational the ultrasonic horn design in the intimae and overseas, for example, the conventional analytics, the equivalent scheme, the substitute way transmit matrix, finite element method, the represent elasticity and so on. In the traditional design methods, the different shape function of ultrasonic horn is very complicated and tedious to be calculated. Basing on the transmit matrix theory, combining the computer program, applying the numerical method, this paper unifies the kinds of ultrasonic horn design. Founding on the unities theory, I will deeply calculate and analyze the acoustic characteristic of compound ultrasonic horns.The paper has 3 segmental contents.1. Based on the four-end network theory, ultrasonic horn's four-end network parameters be analyzed and calculate and uniform. Parameters can be used in every kind of ultrasonic horns. Various performance factors such as resonance frequency equation, displacement node, amplification factor, input force impedance etc of the ultrasonic longitudinal vibrating horns are expressed in the same equation. Programming with this method. So all kinds of ultrasonic horns' performance factors can be expressed in the same equation. If the parameters be given, the computer will give you the dates of other performance factors. Study the horn's characters such as resonance frequency equation, displacement node, amplification factor charged followed area coefficient based on the conclusion we had got .And compared the conclusion which different horns' characterscharged followed area coefficient. At last compared the different horns' displacement and stress. The research to these aspect can be the reference in practice.2.Develop the theory of the single horns to the compound horns, go on to research all kinds of compound horns. The sameness compound horn's four-end network parameters be uniform. Through the two stage hom and the three stage horn , the accuracy of this method can be proved. Study the compound horn's performance include resonance frequency equation and amplification factor charged follow the area coefficient and the change of the size. And compared the conclusion which different compound horns' characters charged followed area coefficient and the size. At last, compared the different compound horns' displacement and stress. As same as the compound horns, the method we had got can be used in the vibration system. In fact the transducer is a kind of compound horn. We designed a vibration system and calculate the performance, the distribute of displacement ,stress use the programming.3.Based on method we designed, the load transformer performance can be calculate. Study the charge of performances when load is pure resistance or pure reactance. Compared the vibration characteristic on three kinds of horns with pure resistance and pure reactance load. The result shows that, If the load is pure resistance ,on a small filed, the rate of speed of about resonance frequency equation and amplification factor charged follow the load is fast. Beyond this field, the charge of resonance frequency equation became slowly, and approach a boundary cost. And amplification factor date approach zero, lost the function of amplify. When load is pure reactance, resonance frequency equation decrease follow the increase of the load. At last it approach two boundary cost. On a small filed, the rate of speed of amplification factor charged follow the load is fast. Beyond this field, the amplification factor date approach zero. Compared the conclusion of characters which different horns under the load, Study the charge of performances under load which pure resistance and pure reactance. Compared the vibration characteristic on three kinds of horns include single horn, two stage horn, the three stage horn with pure resistance and pure reactance load.