Matra

About: Matra is a based out in . It is known for research contribution in the topics: Signal & Detector. The organization has 1330 authors who have published 1216 publications receiving 17967 citations.

Apparatus for driving an electrical load from a principal and an auxiliary power source

Abstract: System for supplying a load (M) with electrical energy from a main source (SP) and from an auxiliary source (UC) consisting of an energy storage and recovery device of the high mass energy capacitor type, in which the auxiliary source (UC) is connected directly to the terminals of the load (M), characterised in that a power electronics interface (IEP), of the switched-mode static converter type, is interposed between the main source (SP) and the auxiliary source (UC), this interface being continuously monitored on the basis of electrical quantities characterising the system status, so as to obtain smoothing of the power supplied by the main source (SP).

A study of Turbulent Flow in Pipe Contractions

Abstract: An experimental study of turbulent water flow through abrupt contractions was carried out in order to determine the detailed flow field. Wall static pressure measurements enabled the calculation of pressure loss coefficients for a range of contraction area ratios from 0.13 to 0.67 over a Reynolds number range of 40000–200000. The effect of variations in contraction sharpness was also established. Measurements of mean velocities and turbulence intensities were made using a two-component laser Doppler anemometer for one area ratio of 0.332 to establish the detailed flow features.

Switching means for use on-board a spacecraft

Abstract: Switching means of a satellite has a first set of switches for receiving respective channel slots of de-multiplexed narrow band channels. The set of switches may be made up of four position switches 5 1 , 5 2 etc. Switch 5 2 may be connected straight through, or to the straight through positions of switches 5 1 and or 5 3 via interswitch connections. The same is possible with the second set of switches 6. A wide selection of the possible frequency slots is possible (for example eight out of sixteen) to allow routing among the amplifiers 9, 10, some of which are designated as redundant.

Accuracy of Discrete Models for the Solution of the Inverse Dynamics Problem for Flexible Arms, Feasible Trajectories

Abstract: The inverse dynamics problem for a single link flexible arm is considered. The tracking order of consistent and lumped finite element models is derived and compared with the tracking order of the continuous model when there is no tip-mass. These comparisons show that discrete models fail to identify the tracking order of a modelled continuous system. A frequency domain analysis shows that an increase in the model order extends the well-modelled low-frequency range and, at the same time, increases the inadequacy in the high-frequency range. As a result, inverse dynamics solutions computed with discrete models do not converge to the continuous solution as the model order increases. The use of high-frequency filters allows us to construct a convergent numerical procedure. A conjecture about the tracking order is presented when there is a tip mass. It is shown that the same results are obtained if superposition of modes rather than finite elements is used.

Base station for a radiotelephone communication system with switchig members for connecting link lines to transmitter members

Abstract: The relay base of the invention comprises a receive antenna connected to a receiver coupling member associated with receiver members connected to respective digital processing units. The digital processing units are connected to transmitter members via link lines each of which is associated with one of the digital processing units and all of the transmitted members via parallel connections, each transmitter member including a switching member causing one of the link lines to be put into communication with the associated transmitter member.