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The dynamic behavior of a towed vibratory roller has been studied through modal testing techniques. Physical mass changes of the frame of the roller have been made to avoid resonance problems and the predicted behavior improvement of the roller is collaborated in the experiments.

A multi-sensing device with a piezoresistive pressure sensor for hydraulic system control was developed, applied to a hydraulic belt conveyor and tested. One single pressure sensor was installed inside a hydraulic motor. By analyzing the output signals, the following engineering variables were measured and could be analyzed: running speed, torque, absolute displacement, horsepower, pressure, mass flow rate of conveyed materials and even malfunction diagnosis. High speed resolution, torque and mass flow rate measurements are focused on in this paper. Based on data sampling rates and windows, high resolution speed data from a hydraulic motor sensor was measured. Relationships between mass flow rates on the conveyor belt and torques due to loading under various situations are presented.

Forecasting the sales of combines and tractors in today's ever changing and volatile marketplace is a difficult task; moreover, it is becoming increasingly important to manufacturers whose goal is to maximize profits with just-in-time policies. Farmers are independent business managers who react to a variety of factors and a unique set of circumstances. Predicting how these individuals will respond to changes in the economic atmosphere is an even more perplexing task than forecasting their business environment. Individually, some farmers may choose to postpone machinery purchases when their cashflow is reduced. Collectively, farmers react to certain factors in a more cohesive manner. For example, if farm commodity prices rise and interest rates are relaxed the agricultural sector will undoubtably increase machinery purchases. Therefore, Federal government policies and also fiscal and monetary policies affect both the farmer's income and the associated agricultural industries sales.

Fluid power is used extensively in forestry equipment with some novel applications of hydraulics to fell, move and process logs and trees. Hydraulic components undergo rugged use under severe conditions, over long periods of minimal maintenance. Selected hydraulic designs are illustrated and discussed. Design features for service requirements on forestry equipment are detailed.