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书籍/力学书籍/OpenFast/FASTKinetics/auto/FASTKinetics.md
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@ -108,7 +108,7 @@ and $\begin{array}{r l}&{\left[C\left(q,t\right)\right]\Bigr|_{H\triangleright d
# Tower: # Tower:
The distributed properties of the tower bring about generalized inertia forces and generalized active forces associated with tower elasticity, tower damping, tower aerodynamics, and tower weight. Note that I eliminated the tower mass tuners, since it is redundant to have both mass and stiffness tuners when trying to tune tower frequencies (to tune the frequencies for individual modes, all that is needed is to tune the mass or the stiffness for the individual modes, but not both). Note also that I eliminated the tower stiffness tuner’s effects on the gravitational destiffening loads. It is also beneficial to eliminate the tower mass tuners because the tower mass density is needed to compute the tower base loads and thus these tuners affect the tower base loads directly—this makes the form of the tower base load equations considerably more complex and considerably less intuitive. Since the tower elastic stiffness does not directly influence the tower base loads in a fundamental way, the retention of the tower stiffness tuners is much more favorable than the retention of the tower mass tuners (recall that only one set of tuners needs to be retained in order to permit the user to match natural frequencies). The elimination of the tower stiffness tuner’s effects on the gravitational destiffening was done for the same reason (i.e., the gravity loads directly affect the tower base loads, and thus, tower stiffness tuners make the form of the tower base load equations considerable more complex and considerably less intuitive). The fact that the gravitational destiffening of the tower is small compared to the overall stiffness of the tower is another reason this elimination of stiffness tuning effects should not be of significant concern. The distributed properties of the tower bring about generalized inertia forces and generalized active forces associated with tower elasticity, tower damping, tower aerodynamics, and tower weight. Note that I eliminated the tower mass tuners, since it is redundant to have both mass and stiffness tuners when trying to tune tower frequencies (to tune the frequencies for individual modes, all that is needed is to tune the mass or the stiffness for the individual modes, but not both). Note also that I eliminated the tower stiffness tuner’s effects on the gravitational destiffening loads. It is also beneficial to eliminate the tower mass tuners because the tower mass density is needed to compute the tower base loads and thus these tuners affect the tower base loads directly—this makes the form of the tower base load equations considerably more complex and considerably less intuitive. Since the tower elastic stiffness does not directly influence the tower base loads in a fundamental way, the retention of the tower stiffness tuners is much more favorable than the retention of the tower mass tuners (recall that only one set of tuners needs to be retained in order to permit the user to match natural frequencies). The elimination of the tower stiffness tuner’s effects on the gravitational destiffening was done for the same reason (i.e., the gravity loads directly affect the tower base loads, and thus, tower stiffness tuners make the form of the tower base load equations considerable more complex and considerably less intuitive). The fact that the gravitational destiffening of the tower is small compared to the overall stiffness of the tower is another reason this elimination of stiffness tuning effects should not be of significant concern.
塔的分布式特性会产生与塔的弹性、阻尼、空气动力学和重量相关的广义惯性力和广义主动力。需要注意的是，我已剔除了塔的质量调谐器，因为在试图调谐塔的固有频率时，同时使用质量调谐器和刚度调谐器是冗余的（为了调谐各个模式的频率，只需要调谐单个模式的质量或刚度，而不需要两者都调）。同样需要注意的是，我剔除了塔的刚度调谐器对重力失 stiffening 载荷的影响。 剔除塔的质量调谐器也很有益处，因为塔的质量密度是计算塔基载荷所必需的，因此这些调谐器直接影响塔基载荷——这使得塔基载荷方程的形式变得更加复杂，且可读性大大降低。由于塔的弹性刚度并没有从根本上直接影响塔基载荷，因此保留塔的刚度调谐器比保留塔的质量调谐器更为有利（请记住，为了允许用户匹配固有频率，只需要保留一套调谐器即可）。 剔除塔的刚度调谐器对重力失 stiffening 载荷的影响，也是出于同样的原因（即重力载荷直接影响塔基载荷，因此塔的刚度调谐器会使塔基载荷方程的形式变得更加复杂，且可读性大大降低）。 塔的重力失 stiffening 效应相对于塔的整体刚度较小，这也是为什么消除刚度调谐效应不应引起重大担忧的另一个原因。 塔架的分布式特性带来了与塔架弹性、塔架阻尼、塔架气动特性和塔架重量相关的广义惯性力和广义主动力。值得注意的是，我消除了塔架质量调谐器，因为在尝试调谐塔架频率时，同时拥有质量和刚度调谐器是多余的（为了调谐单个模态的频率，所需的只是调谐单个模态的质量或刚度，而不是两者都调谐）。另请注意，我消除了塔架刚度调谐器对重力去刚化载荷的影响。消除塔架质量调谐器也是有益的，因为计算塔基载荷需要塔架质量密度，因此这些调谐器直接影响塔基载荷——这使得塔基载荷方程的形式变得相当复杂且直观性大大降低。由于塔架弹性刚度从根本上不直接影响塔基载荷，因此保留塔架刚度调谐器比保留塔架质量调谐器更有利（回想一下，为了允许用户匹配固有频率，只需保留一套调谐器）。消除塔架刚度调谐器对重力去刚化的影响也是出于同样的原因（即，重力载荷直接影响塔基载荷，因此，塔架刚度调谐器使得塔基载荷方程的形式变得相当复杂且直观性大大降低）。塔架的重力去刚化相对于塔架的整体刚度而言很小，这是这种消除刚度调谐影响的做法不应引起重大关注的另一个原因。
![](images/e8b2ca880b8147c9b8b8bc1ebe78e9edd638f1dbb0fa508ed80d0999d727379c.jpg) ![](images/e8b2ca880b8147c9b8b8bc1ebe78e9edd638f1dbb0fa508ed80d0999d727379c.jpg)