Abstract Aerodynamic forces on a slender prism are frequently estimated by conventional measurements using rigid models, thus the characteristics of unsteady aerodynamic forces inherent to an aeroelastic prism often remain unclear. Erected upon empirical results measured from aeroelastic, forced vibration and rigid models, this work supplies a holistic investigation on the characteristics of unsteady aerodynamic forces acting on a slender prism. First, local and generalized aerodynamic forces, unsteady pressures, corresponding power spectra, and Strouhal numbers on the three models are comparatively presented and discussed. Subsequently, wind-induced responses predicted by aerodynamic forces on the three models are drawn parallel to experimental results for comparison. The comparison indicates that the aerodynamic forces measured from aeroelastic and forced vibration models include the effect of structural motion, whereas those observed from a rigid model do not. Furthermore, the responses predicted by aerodynamic forces on an aeroelastic model are in close agreement with experimental results, whereas remarkable discrepancies are found for both forced vibration and rigid models. In addition, the hybrid aeroelastic-pressure balance (HAPB) test technique proves more effective in the measurement of aerodynamic forces than the forced vibration test technique. Ensuing investigation, this work not only advances our understanding on the characteristics of unsteady aerodynamic forces on an aeroelastic prism, but also ascertains the effectiveness of the aforementioned wind tunnel techniques.

中文翻译：

---

气动弹性棱镜上非定常气动力特性的比较研究

摘要 细长棱镜上的气动力通常通过使用刚性模型的常规测量来估计，因此气动弹性棱镜固有的非定常气动力特性往往尚不清楚。根据气动弹性、受迫振动和刚性模型测量的经验结果，这项工作提供了对作用在细长棱镜上的非定常空气动力特性的整体研究。首先，比较介绍和讨论了三种模型的局部和广义气动力、非定常压力、相应的功率谱和 Strouhal 数。随后，通过空气动力对三种模型预测的风致响应与实验结果平行绘制以进行比较。比较表明，从气动弹性模型和受迫振动模型测量的空气动力包括结构运动的影响，而从刚性模型观察到的空气动力则没有。此外，气动力模型对气动弹性模型的响应与实验结果非常吻合，而受迫振动模型和刚性模型均存在显着差异。此外，混合气动弹性压力平衡 (HAPB) 测试技术在空气动力测量方面证明比强制振动测试技术更有效。随后的调查，这项工作不仅增进了我们对气动弹性棱镜上非定常气动力特性的理解，而且还确定了上述风洞技术的有效性。