Measurement and Control

Towle, L. C.

doi: 10.1177/002029407801100101pmid: N/A

The paper begins by discussing those aspects of maintenance of low-power electrical equipment in hazardous atmospheres that are common to both intrinsically safe and type ‘N’ equipment. The salient points particular to each of the techniques are then discussed separately, the points made on intrinsically safe equipment being in line with current accepted practice and those on type ‘N’ equipment being slightly more controversial.

doi: 10.1177/002029407801100102pmid: N/A

The Hydraulics Research Station at Wallingford, Oxon, carries out specific studies and undertakes background research in the field of civil engineering hydraulics. A large part of the work is carried out on a commercial basis, but it also does work for the Department of the Environment. Studies for developing countries is funded by the Ministry of Overseas Development. The total staff of the station is 260 and the annual budget is about £2 million. The HRS's work was on view during Open Days last summer, and its scope can be seen from the details of some of the instrumentation aspects given below.

Ryan, Frank

doi: 10.1177/002029407801100103pmid: N/A

doi: 10.1177/002029407801100104pmid: N/A

doi: 10.1177/002029407801100105pmid: N/A

Ashworth, E. O.

doi: 10.1177/002029407801100106pmid: N/A

An outline of the computer simulation technique is presented, along with a description of the representation of the railway locomotive/train system. This is followed by a survey of locomotive/train simulation, based mainly on work carried out at the Railway Technical Centre, Derby. Firstly, the simulation of train movement and its application to models of the working railway is described. Secondly, the simulation of train control systems within a train simulation is dealt with. Finally, an introduction is given to the computer simulation used in locomotive and train simulators. The paper concludes with some views on the reasons for computer simulation, and mentions the problems and success of the technique.

doi: 10.1177/002029407801100107pmid: N/A

Gladding, E. A.

doi: 10.1177/002029407801100108pmid: N/A

Grimble, M. J.

doi: 10.1177/002029407801100109pmid: N/A

A complex frequency version of the time domain adjoint operator for a linear time-invariant system is obtained. A very simple relationship is shown to exist between this operator and the system transfer function matrix. A simple method of simulating the adjoint system is described.