Views:17 Author:Site Editor Publish Time: 2019-07-26 Origin:Site
What's the relationship bewteen ultrasonic amplitude and energy
The amplitude is a key parameter for the material to be welded, which is equivalent to the temperature of ferrochrome. If the temperature is too low, it will not be welded. If the temperature is too high, the raw material will burn or cause structural damage and strength. Because each transducer is different, the amplitude of the transducer output is different. After adapting the variator and the horn of different ratios, the working amplitude of the horn can be corrected to meet the requirements. The output amplitude of the device is 10-20μm, and the working amplitude is generally about 30μm. The ratio of the horn and the horn is related to the shape of the horn and the horn, the front-to-back area ratio and other factors, such as the exponential change. Amplitude, functional amplitude, stepped amplitude, etc. have a great influence on the transformation ratio, and the front-to-back area ratio is proportional to the total transformation ratio.
For welding machines with different fittings, the simple method is to make the proportion of the working welding head (the material of the welding head must be consistent) to ensure the stability of the amplitude parameters.
Ultrasonic amplitude and energy
The amplitude generally refers to the amplitude of the ultrasonic transducer and the horn device, and the measurement difficulty is that the frequency is high and the amplitude is small. Usually, the frequency is between 19.5 kHz and 21.5 kHz, and the amplitude is between 40 μm and 80 μm. Because of the high frequency, it is beyond the frequency range of most measuring instruments. The small amplitude also puts high demands on the measurement accuracy. Commonly used test methods are powerless to it, so it is difficult to measure. Generally, only the laser vibrometer can be used for measurement, and good results can be obtained. However, the laser vibration measuring equipment is expensive and complicated to operate. It is not necessary to say that the general production unit, that is, the professional research and design unit, is rarely equipped, and it is impossible to apply it universally.
It is well known that for any ultrasonic wave, four parameters can be used for description. In other words, the effect of ultrasound depends only on four parameters, namely time, power, frequency, amplitude. The first two parameters are easy to control, adjust and display. The equipment producers and equipment users are familiar with each other and give enough attention. It is also the adjustment parameter in the daily operation of the equipment. The amplitude (displacement) of ultrasonic vibration is a key indicator of ultrasonic equipment, and it is also a physical quantity that is difficult to measure and difficult to understand. Except for experts and scholars, don't say that the users of the equipment, even the majority of equipment manufacturers, are not very concerned about it. We have compiled most of the instructions for the use of ultrasonic random devices, and there are very few explanations about the amplitude of the ultrasonic waves, including the physical meaning of the amplitude, the control and adjustment of the amplitude.
For the ultrasonic vibration system, from the perspective of transmitting energy, the main indicator is called the sound intensity I of the ultrasonic wave. It refers to the energy transmitted per square centimeter per second in the direction perpendicular to the direction of travel of the traveling wave, ie
Where: ρ is the density of the material
C is the speed of ultrasonic propagation in the material
ω is the angular frequency
ξ is the ultrasonic amplitude
Obviously, as the ultrasonic amplitude increases, the ultrasonic energy multiplies in a square relationship.