Mechanical Drift of Ultrasonic-Linear-Motor-Driving Motion Platforms

Sha, Jin; Yao, Zhi Yuan; Geng, Ran Ran

doi:10.4028/www.scientific.net/amm.190-191.1311

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…For instance, Wang et al used a LUMdriven puncture instrument to insert into cells for tens of minutes. The mechanical drift of the LUM could cause the puncture probe to detach from the anchored cell position, reducing measurement accuracy or even causing failure [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Li,

Yao,

2024

Smart Mater. Struct.

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Linear ultrasonic motors (LUMs) have advantages such as de-energized self locking and-micro-nano displacement resolution. However, the presence of mechanical drift negatively affects their positioning and control accuracy, thereby limiting their application in ultra-precision fields. The mechanism of mechanical drift in the motor is currently unclear. In this study, we initially employ the Burgers model for the stator’s clamp and consider the internal friction and stick-slip effects of the slider, enabling the establishment of a non-autonomous dynamic model of the LUM. This model serves as a tool to delve into the mechanism causing mechanical drift. Subsequently, using this established dynamic model, we investigate how the LUM's structural parameters influence mechanical drift and seek methods to mitigate this undesirable phenomenon. Finally, we validate the model's validity and analyze the effects of different clamps on mechanical drift through experimental research. The research findings reveal that the mechanical drift in the LUM is primarily due to structural creep, with the clamp playing a pivotal role in driving the drift. Increasing the tangential stiffness of the clamp component and slider internal friction prove to be effective approaches to reducing mechanical drift. This study holds substantial theoretical and practical significance as it deepens understanding of the mechanisms of mechanical drift in LUMs and offers a pathway to achieve effective drift control.

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Section: Introductionmentioning

confidence: 99%

“…Research on LUM mechanical drift remains scarce, only Geng et al have paved the way with their insightful preliminary investigation into V-shaped LUMs [6,7]. Their findings suggest a strong link between the drift phenomenon and the LUM's clamp structure.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Li,

Yao,

2024

Smart Mater. Struct.

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Section: Introductionmentioning

confidence: 99%

“…In the last decade, Nanjing University of Aeronautics and Astronautics has conducted research on micromanipulation systems based on V-shape LUM drives [16][17][18]. In 2012, Sha et al designed a 1-degree of freedom (1-DOF) micro manipulator driven by LUMs for cell penetration [16]. In 2016, Geng et al developed a 3-DOF compliant parallel micromanipulation (CPM), with a working space in the millimeter range and a displacement resolution of 100 nm [17].…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling and optimization of mechanical drift for compliant parallel micromanipulation driven by V-shape linear ultrasonic motors

Li,

Yao,

et al. 2024

Smart Mater. Struct.

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Designing micro-mechanisms that satisfy large strokes, high precision, and multiple degrees of freedom has consistently been a research focus and challenge in the field of micromanipulation systems. Linear ultrasonic motors (LUMs), with advantages such as millimeter-level travel, nanometer level motion resolution, and power- -off self-locking, significantly contribute to the advancement in the mechanism design of micromanipulation systems. However, the challenge of mechanical drift lacks a comprehensive theoretical analysis to explain its cause and limits its application. This paper presents a mechanical drift modeling method for a compliant parallel micromanipulation (CPM) driven by a linear ultrasonic motor (LUM). The model primarily focuses on the creep characteristics of the flexure clamp element in the LUM. Based on the stiffness matrix analysis method of the compliant parallel mechanism kinematics, the mechanical drift dynamics model of the CPM is established. The influence of the main structural parameters on the CPM mechanical drift is investigated. The research indicates that the creep of flexure clamps in the CPM is the main factor leading to the mechanical drift. Optimization of mechanical drift is achieved by choosing flexure clamps with higher tangential stiffness for LUM and flexure hinge joints with greater flexibility for CPM. Finally, experimental studies reveal that under equivalent conditions, the mechanical drift of the optimized CPM was significantly reduced than before, proving the rationality of the theoretical model and optimization method.

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Mechanical drift modeling and analysis of V-shaped linear ultrasonic motors with a flexible clamp

et al. 2020

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The flexible clamp used in linear ultrasonic motors (LUMs) not only supports the motor but also simplifies the structure and improves the vibration characteristics. However, the flexible clamp causes the mechanical drift phenomenon, leading to a reduction in positional accuracy. To solve this problem, the mechanical drift mechanism and the control methods of V-shaped LUMs are investigated in this work. First, a mechanical model of the stator of a LUM with a flexible clamp is established to analyze the reason for the mechanical drift. Then, based on the mechanical model, the rules of the appearance of mechanical drift in clamping components with different stiffnesses and shapes are studied. The results indicate that mechanical drift is obvious when the stiffnesses of the two flexible clamps are different, whereas it hardly occurs when clamping components with tremendous tangential stiffnesses are used. Finally, two new types of V-shaped LUM stators that have a flexible clamp on one side and an analogous straight-beam clamp on the other side are proposed. Experiments were conducted to validate the mechanical model analysis and the clamp drift findings, and the results demonstrate that the novel motors have little mechanical drift and stable running characteristics and can be used in precision motion platforms.

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Mechanical Drift of Ultrasonic-Linear-Motor-Driving Motion Platforms

Cited by 5 publications

References 3 publications

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Research on the mechanism and control methods of mechanical drift in linear ultrasonic motors

Dynamic modeling and optimization of mechanical drift for compliant parallel micromanipulation driven by V-shape linear ultrasonic motors

Mechanical drift modeling and analysis of V-shaped linear ultrasonic motors with a flexible clamp

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