6.0 KiB
算例： 1 正常发电工况：
- 均匀风
- 没有变桨、偏航、转速调整 对比结果 功率、叶片变形量、什么什么载荷？
q 叶片、塔架的振型如何看？
风速 8m/s 转速不知
1、Bladed、FAST 15MW模型直接对比结果
2、V0.5软件与fast 15mw对比
3、气动改用AeroDyn ED对比
V4.0 vs V3.5 新增 .fst
- seast ElastoDyn
- 增加ptfmxyIner
- 增加YAW-FRICTION
AD 15
- 删去 AFAeroMod
- 删去 FrozenWake
- 增加NacelleDrag
- 增加BEM_Mod
潜在问题： 1 刚度、模态曲线是否一致 bladed 模态振型导出 bladed 模态与fast一致后，计算结果如何 2 气动结果差异
测试过程
- 采用v3.5气动数据情况下，多体计算结果与FAST一致
- 采用v4.0气动数据情况下，多体计算结果与FAST一致
fast bladed 载荷对比 叶片载荷
| fast | |||
|---|---|---|---|
| Spn1MLxb1 | Blade 1 local edgewise moment at span station 1 | About the local xb1-axis | (kN-m) |
| Spn1MLyb1 | Blade 1 local flapwise moment at span station 1 | About the local yb1-axis | (kN-m) |
| Spn1MLzb1 | Blade 1 local pitching moment at span station 1 | About the local zb1-axis | (kN-m) |
| Spn1FLxb1 | Blade 1 local flapwise shear force at span station 1 | Directed along the local xb1-axis | (kN) |
| Spn1FLyb1 | Blade 1 local edgewise shear force at span station 1 | Directed along the local yb1-axis | (kN) |
| Spn1FLzb1 | Blade 1 local axial force at span station 1 | Directed along the local zb1-axis | (kN) |
| bladed | |||
| Bladed 1 Mx | Principal axes | (N-m) | |
| Bladed 1 My | Principal axes | (N-m) | |
| Bladed 1 Mxyz | Principal axes | (N-m) | |
| Bladed 1 Fx | Principal axes | (kN) | |
| Bladed 1 Fy | Principal axes | (kN) | |
| Bladed 1 Fxyz | Principal axes | (kN) |
Principal axes: The positive z-axis follows the local deflected neutral axis at each blade station towards the blade tip. The positive y axis is defined by the principal axis orientation. The positive x axis is orthogonal to the y and z and follows the right hand rule. For output loads, the origin of the axes is on the neutral axis at each local deflected blade station. (see diagram below)
主轴：正向z轴沿每个叶片位置向叶片末端的挠曲中性轴延伸。正向y轴由主要轴系方向定义。正向x轴垂直于y轴和z轴，并遵循右手螺旋定则。对于输出载荷，坐标原点位于每个挠曲中性轴上。（见下方的示意图）
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principal axes coordinate system
Note that there is a subtle difference between the “principal axis” frame and the “blade local element frame”. The “blade local element frame” is orientated so that the X vector in this coordinate system points directly between adjacent nodes on the blade. The other two coordinate system vector directions are determined by the “principal axis twist” angle. This is explained in more detail in DNV GL technical note UKBR-110052-T-31-A The “principal axis” frame is used for load output in Bladed. The principal axis orientation is calculated by taking the average orientation of the two blade elements at the node where the elements join. This is illustrated below. The two adjoining local element frames are shown in green and red. The principal axes output frame is shown in blue. Note that the element local coordinate system has its x direction along the element, unlike the “principal axes” coordinate system which has z along the element axis. 需要注意的是，“主轴系”和“叶片局部单元系”之间存在细微差别。 “叶片局部单元系”的定向方式是，该坐标系中的X向量直接指向叶片上相邻节点之间的连线。另外两个坐标系向量方向由“主轴扭转”角度决定。 详情请参见DNV GL技术备忘录UKBR-110052-T-31-A。 Bladed中用于输出载荷的是“主轴系”。主轴方向的计算是通过取叶片节点处两个叶片单元的平均方向来实现的。下图所示。两个相邻的局部单元系分别用绿色和红色表示。主轴输出系用蓝色表示。 需要注意的是，局部单元坐标系的x方向沿着单元方向，而“主轴系”坐标系的z方向沿着单元轴方向。
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Relationship between blade "local element axes" and "principal axes coordinates"
Root axes: The orientation of the axes is fixed to the blade root and does not rotate with either twist or blade deflection. The axis set does rotate about the z axis with pitch. For output loads, the origin of the axes is on the neutral axis at each local deflected blade station. 根部坐标轴：坐标轴的方向固定于叶片根部，不会随扭角或叶片挠曲而旋转。坐标轴系会绕z轴旋转，以适应变桨角度。对于输出载荷，坐标轴原点位于每个局部挠曲叶片位置的受力中性轴上。