Thermal Protection of Piezoelectric Actuators Using Complex Electrical Power Measurements and Simplified Thermal Models

Yong, Yuen Kuan; Eielsen, Arnfinn A.; Fleming, Andrew J.

doi:10.1109/tmech.2023.3277437

Cited by 1 publication

(1 citation statement)

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“…Factors affecting the stability of ultrasonic drill include the high and low temperatures of the asteroid surface (−45 to 90 • C) [4], the control method and impedance matching of the ultrasonic drive power [5], [6], the type of ultrasonic drill motion [7], [8], and the weight-on-bit control method [9]. High and low temperatures can cause changes in drilling performance by affecting the impedance characteristics of the ultrasonic drill [10]. Resonant frequency tracking and constant amplitude control of the ultrasonic drive power are crucial for maintaining the amplitude stability of the piezoelectric transducer [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Passive Versus Active Control of Weight-on-Bit for an Ultrasonic Percussive Drill

Wang,

Li,

Quan

et al. 2024

IEEE/ASME Trans. Mechatron.

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Multiple ultrasonic percussive drill cross-drilling anchoring helps to achieve long-term, secure attachment of sampling platforms in extreme environments. Ultrasonic percussive drills require less weight-on-bit (WOB) and lower power than conventional drills, making them more suitable for asteroid anchoring mission. Choosing a suitable WOB control method is one of the key factors to ensure rapid and stable drilling, but there is little research on the effect of WOB control method on ultrasonic drilling performance. To address the technical challenges of drilling, this paper investigates the effects of passive and active WOB control on ultrasonic drilling performance. Firstly, the mechanical configuration of an ultrasonic percussive drill is presented and a full-wavelength piezoelectric transducer is designed using impedance analysis (IA) and Experimental Modal Analysis (EMA). Then, passive control of WOB is implemented using suspended weights, and active control is implemented using a linear actuator. Finally, the effect of the WOB control method on drilling performance is experimentally verified on rocks with different compressive strengths. Our results show that active control is better suited to WOB variation and rock compressive strength variation. When the WOB is 5 N, the drilling rate of passive control is slightly higher than that of active control, but the difference is not significant. When the WOB is 10 N and 15 N, the drilling rate of active control surpasses that of passive control. The ultrasonic percussive drill's power consumption is less than 60 W. This paper provides a technical reference for selecting the WOB method for ultrasonic percussive drills in planetary exploration.

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