當工作（zuò）頻（pín）率很低（在人的聽覺範圍內）就會產生噪音。當（dāng）頻率低（dī）於20kHz時，工作噪音不僅變（biàn）得很大，而且可能（néng）超出相關條（tiáo）例所規（guī）定的安全噪音的限度。在需要（yào）高功率去除汙垢而不（bú）用考慮工（gōng）件表麵損傷的應用（yòng）中，通（tōng）常選擇從20kHz到（dào）30kHz範圍內的較低清洗（xǐ）頻率該頻率範圍內的清洗頻率常常被用於清（qīng）洗大（dà）型、重型零件或高密度材料的工件。

When the working frequency is very low (within the range of human hearing), noise will be produced. When the frequency is lower than 20kHz, the working noise not only becomes very loud, but also may exceed the safety noise limit stipulated by relevant regulations. In the application that needs high power to remove dirt without considering the surface damage of workpiece, the lower cleaning frequency from 20kHz to 30kHz is usually selected. The cleaning frequency in this frequency range is often used to clean large, heavy parts or high-density materials.

超聲波清洗機設備廠家告訴（sù）您：高頻通常被用於清洗較小的零件，或清除微小顆粒。高頻還被用於被工件表麵不允許損傷的應用。

Ultrasonic cleaning equipment manufacturers tell you: high frequency is usually used to clean smaller parts, or remove small particles. High frequency is also used in applications where the surface of the workpiece is not allowed to be damaged.

使用高頻可從幾個方麵（miàn）改善（shàn）清洗性能。隨（suí）著（zhe）頻（pín）率的（de）增加，空化泡的數量（liàng）呈線（xiàn）形增加，從而產生更多更密集的衝擊（jī）波使其能進入到更小的縫隙中。如果功率（lǜ）保（bǎo）持不變，空化（huà）泡變小，其釋放的能（néng）量相應（yīng）減少，這樣有效（xiào）地減小了對工件表麵的損傷。

The use of high frequency can improve the cleaning performance from several aspects. With the increase of frequency, the number of cavitation bubbles increases linearly, resulting in more and more dense shock waves, which can enter into smaller gaps. If the power remains unchanged, the cavitation bubble becomes smaller, and the energy released is reduced accordingly, which effectively reduces the damage to the workpiece surface.

高頻的另一個優勢在於減小了粘滯邊界層（céng）（泊努裏效應），使得超聲波能夠'發現'細小的微粒。市場上常用頻率的產品有28KHz、32KHz、40kHz.

Another advantage of high frequency is that it reduces the viscous boundary layer (ponuri effect), which makes it possible for ultrasound to 'discover' fine particles. The frequency products commonly used in the market are 28kHz, 32kHz and 40KHz

功率密度：

Power density:

功率（lǜ）密度=發射功率（W）/發射麵積（cm2），通（tōng）常≥0.5W/cm2.超聲波的功率密度越高，空化效果越強，清洗速度（dù）越快，清洗效果越好。但長時間，高密度的清（qīng）洗，容易造成清洗物件表麵產生"空化"腐蝕。

The higher the ultrasonic power density is, the stronger the cavitation effect is, the faster the cleaning speed is, and the better the cleaning effect is. However, long-time and high-density cleaning is easy to cause cavitation corrosion on the surface of the cleaned object.

清洗溫度：

Cleaning temperature:

一般來說，超聲波在50℃-85℃時，效果好。

Generally speaking, the effect of ultrasonic is good at 50 ℃ - 85 ℃.