柳亚芳和娄帅在2017年三校博士学术文化节上的宣讲

2017年北航-清华-北大三校“歼十杯”博士生学术文化节即将于本周末在顺鑫绿色度假村举行。来自北京航空航天大学ld乐动体育官方网站的柳亚芳和娄帅同学将带来关于各自研究课题的宣讲。

柳亚芳同学的报告题目是《直升机旋翼摆振阻尼器的结构设计和动力学分析》。

报告内容是：The elastomeric lag dampers suppress the ground resonance and air resonance that play a significant role in the stability of the helicopter. In this paper, elastomeric lag damper which is made from silicone rubber is built. And a series of experiments are conducted on this elastomeric lag damper. The stress-strain curves of elastomeric lag dampers employed shear forces at different frequency are obtained. And a finite element model is established based on Burgers model. The result of simulation and tests shows that the simple, linear model will yield good predictions of damper energy dissipation and it is adequate for predicting the stress-strain hysteresis loop within the operating frequency and a small-amplitude oscillation.

娄帅同学的报告题目是《高精度WENO格式研究》。

报告内容是：本文针对高精度WENO (格式展开研究工作。首先分析原始 WENO 和 WENO-Z 格式的构造思想：在保证稳定性和收敛性的前提下，提高不光滑模板的权重，使得格式更偏向“中心”，这有利于降低格式耗散，提高格式的精度。基于上述改进思路，提出了修正格式 WENOZP，修正格式在权重中新加入一项，进一步提高不光滑模板的权重，使得 WENOZP 在激波和间断处拥有与 WENO-Z 同样的稳定性和分辨效果，而在较高梯度的光滑区域和极值点附近，表现出更高的分辨精度。