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"중력 보상"

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"중력 보상"

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Design and Performance Optimization of a Wire-spring Based Planar Gravity Compensation Mechanism for a Robotic Arm
Kyuna Park, Minhyo Kim, Sangrok Jin
J. Korean Soc. Precis. Eng. 2026;43(6):559-566.
Published online June 1, 2026
DOI: https://doi.org/10.7736/JKSPE.025.00020
This study introduces a wire-spring based planar gravity compensation mechanism and evaluates its performance through both analysis and experiments. The mechanism features three pulleys, one spring, and one wire, all arranged in a planar configuration for compact installation within a robotic arm. A linear approximation of the target gravitational torque was derived using the least-squares method, allowing for the determination of spring stiffness and initial tension. Experimental results indicated that the proposed mechanism reduced the maximum torque by approximately 63%. However, the measured slope was gentler than the theoretical model due to friction losses. Additional tests that varied spring stiffness (k) and initial wire tension (A) confirmed that k primarily influences the slope of the compensation torque, while A affects its intercept. This finding suggests that compensation performance can be tailored to specific requirements by adjusting these parameters. The study successfully demonstrates a compact and lightweight mechanism and experimentally validates its tunability through design adjustments. Future research will focus on reducing friction, extending the mechanism to multi-degree-of-freedom systems, and validating performance under dynamic conditions for applications in collaborative and medical robots.
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Article
Development of a Statically Balanced Lifting Device for Repetitively Transporting Construction Materials
Byungseo Kwak, Seungbum Lim, Jungwook Suh
J. Korean Soc. Precis. Eng. 2024;41(12):929-937.
Published online December 1, 2024
DOI: https://doi.org/10.7736/JKSPE.024.083
In the field of construction automation, significant research efforts continue to focus on replacing human labor; however, the varied and dynamic nature of construction sites still requires human intervention. The high task intensity in construction sites, particularly in lifting heavy materials, frequently results in musculoskeletal disorders among workers. To address this issue, this paper proposes a lifting device to replace manual material transportation through an opening between floors. The lift is designed with a gear-constrained double parallelogram mechanism to enable straight vertical movement. Moreover, a crank-rocker mechanism is incorporated to improve efficiency in repetitive tasks, reduce the required driving torque, and simplify control complexity. Additionally, this study introduces a passive gravity compensation mechanism that employs springs and cables, tailored to the lifting process, to enhance payload capacity and stabilize actuation. Through the integration of these mechanisms, the necessary motor capacity and control costs are significantly reduced. The effectiveness of the device is validated by actuation experiments with a fabricated prototype.

Citations

Citations to this article as recorded by  Crossref logo
  • Complete gravity balancing of the general four-bar linkage using linear springs
    Chin-Hsing Kuo
    Mechanism and Machine Theory.2025; 214: 106140.     CrossRef
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