Find Expansion Speed of Piezoelectric Actuator | 16+ mph

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To find the expansion speed of a piezoelectric actuator, the formula used is displacement multiplied by frequency, converted to miles. The calculation resulted in a speed of over 16 mph for an actuator displacing 20 micrometers at 200,000 hertz. However, it is noted that piezoelectric actuators do not typically reach speeds close to the speed of sound. The discussion highlights a misunderstanding regarding the expected particle velocity of these devices. Overall, the actual speeds achieved by piezoelectric actuators are significantly lower than anticipated.
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Does anyone know how to find the "expansion" speed of a piezoelectric actuator? I tried displacement x frequency in hertz x 2 x 60 x 60 and then converted from um to miles. I'm getting 16> mph or an actuator that displaces 20um at 200,000 hertz.

I thought these things moved fast, approaching the speed of sound fast.
 
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http://www.piceramic.com/piezo-technology/properties-piezo-actuators.html
 
There is no reason to expect the particle velocity approaching the speed of sound.
 
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