A National Measurement System for Radiometry, Photometry, by A. C. Parr

By A. C. Parr

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3 shows a diagram of the mechanism and a detail of the lowest part of the main support. Development of a Heliostat for a Solar Tower Power Plant 49 Fig. 3 Azimuth mechanism and detail A A Fig. 4 Elevation mechanism 4 Elevation Mechanism The elevation mechanism (Fig. 4) consists in a four bars mechanism working with a ball screw and actioned by an electric motor. It moves the reflective surface up and down until 90°. The best quality of this configuration is the zero backlash of the ball screw, this means that the position of the mirrors would be exact depending on the time of the day.

Output Stabilization of Linear Systems with Disturbances 39 Theorem 1 Under assumptions A1–A3, if uðtÞ is designed according to (6), yðtÞ tends exponentially to zero. , ^zðtÞ ¼ P^xðtÞ tends to ^ Þ will vanish, zðtÞ ¼ PxðtÞ). Therefore, the errors ðz1 À ^z1 Þ, ðz2 À ^z2 Þ, and ðw À w and, since ðA11 À B1 K Þ is Hurwitz, z1 will tend asymptotically to zero. Thereby, yðtÞ will tend to zero also. , [11]). Let us consider the following linear longitudinal model of a Boeing 767, :  xðtÞ þ Bu  ðtÞ þ Ew  ðt Þ xðtÞ ¼ A  ðtÞ þ Du  ðtÞ þ Fw  ðt Þ yðtÞ ¼ Cx where x is the state vector whose components are the surge velocity ul , the angle of attack a, the pitch rate q, and the pitch angle h.

4 shows the x component of the dynamic unbalance moment f Mfc , analytical and numerical. Both figures show a perfect match of the two approaches. 5 Discussion About a Balancing Geometry The balancing of the planetary gear train requires that both relations (20) and (21) are zero. Some design parameters, namely a and snc c , are related to the functional and gear design of the mechanism and cannot be used to balance it. Regarding the static balancing, the first term of Eq. 20 (mn sinðaÞGny ) is mostly determined by embodiment requirements of gears 1 and 3 (Fig.

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