A Dual Frequency Ultrasonic Cleaning Tank Developed by Transient Dynamic Analysis

Abstract

At present, development of manufacturer’s ultrasonic cleaning tank (UCT) to match the requirements from consumers usually relies on computer simulation based on harmonic response analysis (HRA). However, this technique can only be used with single-frequency UCT. For dual frequency, the manufacturer used information from empirical experiment alongside trial-and-error methods to develop prototypes, resulting in the UCT that may not be fully efficient. Thus, lack of such a proper calculational method to develop the dual frequency UCT was a problem that greatly impacted the manufacturers and consumers. To resolve this problem, we proposed a new model of simulation using transient dynamics analysis (TDA) which was successfully applied to develop the prototype of dual frequency UCT, 400 W, 18 L in capacity, eight horn transducers, 28 and 40 kHz frequencies for manufacturing. The TDA can indicate the acoustic pressure at all positions inside the UCT in transient states from the start to the states ready for proper cleaning. The calculation also reveals the correlation between the positions of acoustic pressure and the placement positions of transducers and frequencies. In comparison with the HRA at 28 kHz UCT, this TDA yielded the results more accurately than the HRA simulation, comparing to the experiments. Furthermore, the TDA can also be applied to the multifrequency UCTs as well. In this article, the step-by-step development of methodology was reported. Finally, this simulation can lead to the successful design of the high-performance dual frequencies UCT for the manufacturers.

Vibration Analysis and Development of a Submersible Ultrasonic Transducer for an Application in the Inhibitory Activity of Pathogenic Bacteria

“…Ultrasonic Transducer (UT) is an electronics device that transforms electricity into vibration in the range of 20-200 kHz transmitted through media for such applications. For example, UT has been used in welding machines [1], cell disruptors [2], and cleaning machines [3][4][5][6][7]. For the cleaning purpose, UT can be divided into two types of operation: Outer Ultrasonic Transducer (OUT) and Submersible Ultrasonic Transducer (SUT), as shown in Fig.…”

“…Moreover, the PZT8 has been used in devices that require higher durability than the PZT4 [17][18][19][20]. However, all mentioned technology in previous studies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] cannot provide a satisfactory result in the industrial cleaning process. The produced cavitation still did not fully cover the industrial grade's tank even though there are several UTs installed.…”

“…The produced cavitation still did not fully cover the industrial grade's tank even though there are several UTs installed. For the acoustic simulation, the manufacturers commonly use the finite element approach such as harmonic response analysis (HRA) to figure the positioning of the UTs which perform the necessary criteria of the cleaning process according to the customers' needs [3][4][5][6][7]. In addition, for the cleaning machines included a particle eliminated system, the computational fluid dynamics (CFD) may be applied to find outflow rate, flow direction, shapes, and locations of inlet and outlet.…”

“…The results were optimized to achieve a high cleaning process efficiency to prevent recontamination of the products [6]. It can be noticed that in [3][4][5][6][7] the research relied on the commercial UTs using acoustic simulation which gave rise to the limitation of the cleaning efficiencies. Therefore, if the computational simulation has been employed to develop the specially designed UTs suit to the specific utilization, the efficiency of the cleaning process certainly is increased.…”

A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

“…After that, the results in Figure 9a would be calculated using a fast Fourier transform (FFT) and then normalized with the maximum pressure to obtain the normalized power spectrum (NPS) as in Figure 9b. This NPS could be the indicator to precisely investigate the frequency, as mentioned in [29]. From the results in Figure 9a, it was confirmed that the shapes of the modifications affected the average pressure.…”