Accuracy Assessment of Pseudo-Rigid-Body Model for Dynamic Analysis of Compliant Mechanisms
Accuracy Assessment of Pseudo-Rigid-Body Model for Dynamic Analysis of Compliant Mechanisms
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DOI：
10.1115/1.4037186
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发表时间：
2017-10-01
影响因子：
2.6
通讯作者：
Zhang, Xian-Peng
中科院分区：
文献类型：
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作者：
Li, Na;Su, Hai-Jun;Zhang, Xian-Peng
柔顺机构的动态特性分析对于柔顺机构的设计和应用，特别是高速应用中的动力学和控制性能具有重要意义。虽然伪刚体（PRB）模型已被广泛研究的静力分析，其动力分析的准确性是相对较少的评价。在本文中，我们首先评估的PRB模型的准确性，通过比较对连续模型，使用动态模拟。然后，我们研究了质量分布对柔性并联导引机构PRB模型动力学特性的影响。我们表明，当光束质量大于10%的运动平台，误差是显着的。然后，我们提出了一个新的PRB模型与校正的质量分布系数，显着减少的PRB模型的误差。并根据修正后的质量分布系数分析了结构的动力响应。最后，以柔性双平行导向机构为例，验证了所提出的柔性机构动力学PRB模型的有效性。
Dynamic characteristics analysis is very important for the design and application of compliant mechanisms, especially for dynamic and control performance in high-speed applications. Although pseudo-rigid-body (PRB) models have been extensively studied for kinetostatic analysis, their accuracy for dynamic analysis is relatively less evaluated. In this paper, we first evaluate the accuracy of the PRB model by comparing against the continuum model using dynamic simulations. We then investigate the effect of mass distribution on dynamics of PRB model for compliant parallel-guided mechanisms. We show that when the beam mass is larger than 10% of the motion stage, the error is significant. We then propose a new PRB model with a corrected mass distribution coefficient which significantly reduces the error of the PRB model. And the dynamic responses are also analyzed according to the corrected mass distribution coefficient. At last, a compliant double parallel-guiding mechanism is used as a case study for validation of the new PRB model for dynamics of compliant mechanisms.