Plough calculation peculiarities for walking tractors

Slicot Drives Tractors! 1

We describe the successful application of a SLICOT subroutine in a control engineering problem. Based on GPS data it is possible to automatically steer farm vehicles along a prescribed trajectory. The bottleneck for the successful on-line implementation of a LQG regulator is the numerical solution of a discrete-time algebraic Riccati equation in real-time and at high accuracy. This is achieved ...

Dr. Harold Kleinert and the Plough

Kentucky, at his clinic which was a veritable beehive of activity almost entirely devoted to the surgery of the hand. I remember that it was located near about the Mohammad Ali Avenue, who recently passed away because that is where he was born as Casius Clay. Years before I first met Dr. Kleinert, I had served as a resident at the Grace Hospital in Detroit (1972) where they used to speak about ...

Parabolic Geometries , Cr { Tractors , And

Power Hop Instability of Tractors

Power hop is a “porpoising” type of pitch/bounce oscillation superimposed on the forward motion of tractors equipped with pneumatic tires. It is most often observed with tractors having two powered axles pulling towed implements in moderate to high draft field operations on dry soils. As power hop begins, the tractor exhibits gradually increasing vibration amplitudes until the operator, of nece...

An empirical depreciation model for agricultural tractors in Spain

This work analyses the market value of second hand agricultural tractors in Spain for the period 1999-2002, with the aims of obtaining the most appropriate valuation models (through the use of ordinary least squares regression) and proposing an empirical model that estimates the true depreciation of these vehicles. Differences in tractor depreciation were studied in terms of the three horsepowe...