Circuit layout for the simulation of moments of inertia on test

Details Circuit layout for the simulation of moments of inertia on test Circuit layout for the simulation of moments of inertia on test

1985-05-06

1986-11-11

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

738664, G01M 1500

Patent

active

046215247

ABSTRACT:
Test stands for automotive vehicles at the present are required in most cases to permit dynamic tests wherein an essential criterion consists of the simulation of the actual vehicle inertia moment, in order to obtain a realistic acceleration behavior. The test stand normally has a constant inertia moment. A process and a circuit layout is proposed for the simulation of vehicle inertia moments, whereby the test stand and the test specimen represent a n-mass oscillator, the masses of which are elastically joined together. By means of electronic functional elements (24, 25, 27, 32, 33, and 34), an m number of further masses are imitated electronically so that the regulation technical structure corresponds to the differential equation system of a (n+m) mass system. An air gap moment controlled electric machine is used as the transmission element (34) between the electric functional elements (24, 25, 27, 32, 33, and 34) and the mechanical masses. By setting the time constants (T.sub.Kfz, T.sub.CKfz) and the amplification factors (K.sub.dKfz) of the functional elements (24, 25, and 27), the vehicle vibration behavior (natural frequency, attenuation) may also be imitated, in addition to the simulation of the vehicle inertia moment.

REFERENCES:
patent: 3712127 (1973-01-01), Petersen
patent: 4327578 (1982-05-01), D'Angelo
patent: 4457165 (1984-07-01), Wiederrich
"Simulating the Dynamic Performance of the Engine by an Electric Motor Serving as Test Rig Drive", Hans-Juergen von Thun, Electronics for National Security Conference, Sep. 27-29, 1983, pp. 397-411.
"Bremsenpruefstand mit Schwung-Massensimulation", Hans-Juergen von Thun, Antriebstechnik, 1981, No. 6, pp. 49-53.

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