## 1 Test description

In this test we compare the eigenfrequencies of an isolated DTU 10-MW blade given in Table 6.4 of Bak et al. (2013) to results obtained in Ashes.

## 2 Model

The DTU 10-MW blade can be found in the Blade database. The blade is fixed at its root.

## 3 Benchmarks

In the following sections, the different modeshapes are illustrated and the expected eigenfrequencies as listed in Bak et al. (2013) are given.

### 3.1 First flapwise mode

The expected eigenfrequency is
$$f_1 = 0.61 \text{ Hz}$$
.
This mode shape is illustrated in the figure below:

### 3.2 First edgewise mode

The expected eigenfrequency is
$$f_2 =0.93\text{ Hz}$$
.

### 3.3 Second flapwise mode

The expected eigenfrequency is
$$f_3 =1.74\text{ Hz}$$
.

### 3.4 Second edgewise mode

The expected eigenfrequency is
$$f_4 = 2.76\text{ Hz}$$
.

### 3.5 Third flapwise mode

The expected eigenfrequency is
$$f_5 =3.57\text{ Hz}$$
.

### 3.6 Third edgewise mode

The expected eigenfrequency is
$$f_6 =6.66\text{ Hz}$$
.

### 3.7 Fourth flapwise mode

The expected eigenfrequency is
$$f_7=6.11\text{ Hz}$$
.

## 4 Results

The test is considered passed if the results from Ashes are within 5% of the data from the specification document. A bar plot comparing the eigenfrequncies is available on the following link: