A longitudinal &amp; longitudinal-torsional vibration actuator for rotary-percussive ultrasonic planetary drills

Bai, Deen; Quan, Qiquan; Wang, Yinchao; Tang, Dewei; Deng, Zongquan

doi:10.1016/j.asr.2018.09.037

Cited by 21 publications

(7 citation statements)

References 27 publications

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“…e experimental results show that the addition of ultrasonic vibration can signi cantly reduce the drilling pressure. Based on this advantage, some scholars try to use ultrasonic vibration technology in the process of extraterrestrial rock sample acquisition [6,7]. en some scholars put forward the rotarypercussive ultrasonic drill based on the structure of longitudinal torsional coupled vibration [7,8].…”

Section: Introductionmentioning

confidence: 99%

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Han

Zhao

Zhang³

et al. 2022

Shock and Vibration

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As a type of ultra-high frequency loading, ultrasonic vibration is an effective way to break the rock at high rates. Exploring the influence of various factors on the loading effect is essential for its effective application to assist drilling. In this study, the damage evolution of granite under ultrasonic vibration with different amplitudes was investigated. The theoretical and numerical simulation models of rock breaking by ultrasonic vibration were established. The research group applied ultrasonic vibration loading to granite using different amplitudes. The damage characteristics were tested by NMR experiment, and the damage evolution was numerical analyzed by Particle Flow Code software. The result shows that the propagation of cracks is positively correlated with the amplitude of ultrasonic vibration. The increase of amplitude magnifies the generation of transverse cracks, which is conducive to the stripping of rock fragments. A threshold value was found for the amplitude, and fractures show different propagation and expansion characteristics at the higher and lower values. Increasing the amplitude magnifies the stress at the crystal defect and speeds up the crack propagation process. The stress wave generated by ultrasonic vibration inside the rock will attenuate with the increase in depth. Increasing the amplitude value will amplify the stress in the influence area, and decrease the size of the area.

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Section: Introductionmentioning

confidence: 99%

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Han

Zhao

Zhang³

et al. 2022

Shock and Vibration

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“…The traditional rotary drilling technology is difficult to operate in a weak gravitational environment and hard rock formations due to problems such as high-required axial force, continuous holding torque, high power consumption, large mass, inability to circulate effectively, and severe wear of the drill bit [5][6][7] . In order to better realize the efficient sampling of hard objects of extraterrestrial celestial rocks, domestic and foreign scholars and institutions have carried out a lot of research on extraterrestrial rock sampling technology, including projectile sputtering sampling technology [8][9][10] , cutting sampling technology 11 , impact and coring sampling technology [12][13], pneumatic sampling technology 14 , impact and ultrasonic vibration drilling sampling technology [15][16][17][18][19][20][21][22][23][24][25][26][27][28] , etc. Among them, the impact and ultrasonic vibration drilling sampling technology has the characteristics of simple structure, low power consumption, small-required axial force, strong controllability and strong adaptability 15 .…”

Section: Introductionmentioning

confidence: 99%

Design of high-frequency and micro-amplitude impactor suitable for extraterrestrial rock sampling

Zhang

Yu²,

Zhang³

et al. 2022

2nd International Conference on Artificial Intelligence, Automation, and High-Performance Computing (AIAHPC 2022)

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The traditional rotary drilling technology has the problems of high-required axial force, high power consumption, large mass and serious wear of the drill bit. It is difficult to be better applied in the detection of extraterrestrial celestial bodies with weak gravitational environment and hard rock layers. The high-frequency micro-amplitude impactor can greatly reduce the drilling pressure and power consumption by using high-frequency impact to drill objects with high hardness such as rocks. Therefore, based on the piezoelectric transducer, a high-frequency micro-amplitude impactor is designed by analyzing the configuration of the horn and the collision system of the spring-mass system. It is verified that the no-load frequency of the impactor is above 1000Hz, and that the amplitude is about 0.2mm. Finally, the validity of the design of the high-frequency and micro-amplitude impactor is verified by the sandstone-drilling experiment.

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“…Generally, there are two main investigations to be made into rotary longitudinal–torsional coupled ultrasonic vibration-assisted grinding (LTUAG), namely the design of the LTUAG device and the optimisation of the LTUAG process. In terms of the design of the LTUAG device, the amplitude ratio of torsional-to-longitudinal vibration is a critical parameter for LTUAG and is mainly integrated through the structure to achieve the vibration modal conversion from longitudinal vibration to torsional vibration [ 12 , 13 , 14 ]. In terms of optimising the LTUAG process parameters, compared to longitudinal ultrasonic vibration, longitudinal–torsional coupled ultrasonic vibration can not only reduce more than 50% of the axial force when drilling hard and brittle materials [ 15 ], but can also improve the material removal rate [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Torsional Vibration in Longitudinal–Torsional Coupled Ultrasonic Vibration-Assisted Grinding of Silicon Carbide Ceramics

Chen

et al. 2021

Materials

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Rotary longitudinal–torsional coupled ultrasonic vibration-assisted grinding (LTUAG) is a new manufacturing method that can improve the grinding ability of silicon carbide ceramics. However, compared with longitudinal ultrasonic vibration-assisted grinding (LUAG), the role of torsional vibration in the grinding process is unclear. In this study, an effective method for measuring longitudinal–torsional coupled ultrasonic vibration amplitude and an experimental setup for measuring actual amplitude during grinding are proposed. The trajectory of the abrasive grains under the same grinding parameters and the same longitudinal amplitude during LTUAG and LUAG are analysed. Ultrasonic amplitude curves under the condition of tool rotation are then measured and analysed. Finally, the effect of torsional vibration on grinding force and surface roughness under the same grinding conditions is explained. Experimental analysis shows that the introduction of torsional vibration has little effect on the trajectory length and does not change the number of interference overlaps between abrasive grain tracks. Torsional vibration will only increase the cutting speed during grinding and reduce the undeformed chip thickness, which will reduce the grinding force and improve the surface roughness of LTUAG.

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A longitudinal & longitudinal-torsional vibration actuator for rotary-percussive ultrasonic planetary drills

Cited by 21 publications

References 27 publications

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Design of high-frequency and micro-amplitude impactor suitable for extraterrestrial rock sampling

The Effect of Torsional Vibration in Longitudinal–Torsional Coupled Ultrasonic Vibration-Assisted Grinding of Silicon Carbide Ceramics

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