Timedomain responses

In Fig. 4.20 and 4.21 the measured and simulated tower top acceleration response in x-direction are compared. To ensure that the simulation starts in steady-state, the equilibrium point has been determined, and the corresponding state vector has been saved. This state vector is used as initial condition in the performed simulation. From the figures it is clear that the SDLW1 model accurately describes the real response. Note that the time-domain response depends on the unknown (viscous) damper constants. These constants have been estimated from the measured response and are used to generate the presented time histories. To achieve (even) better correlation with the measured response, all model parameters can be updated using the approach presented in Molenaar [191].

Micro Wind Direction Sensor
Figure 4.18: Collection of periodogram estimates of the power spectral density (PSD) of the responses in x-direction (sensor A-01 to A-05, A-07, A-09 and A-11 respectively) from measurement M2.

PSD of sensors in x-direction

PSD of sensors in x-direction

Frequency [Hz]

Figure 4.19: Two-dimensional view of Fig. 4.18. The viewpoint set along the x-axis (thereby disrecarding the accelerometer position information).

Frequency [Hz]

Figure 4.19: Two-dimensional view of Fig. 4.18. The viewpoint set along the x-axis (thereby disrecarding the accelerometer position information).

Time [sec]

Figure 4.20: Measured versus simulated tower top acceleration response from measurement M2. Thin line: measured response and thick line: simulated response.

Time [sec]

Figure 4.20: Measured versus simulated tower top acceleration response from measurement M2. Thin line: measured response and thick line: simulated response.

Figure 4.21: Measured versus simulated tower top acceleration response from 'measurement M2 (zoom of box in Fig. 4.20). Thin line: measured response and thick line: simulated response.
Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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