However, the needs have not yet been attempted.The goal of this study was to verify whether the duty levels and characteristics of the powertrain system for the endurance test ground present the proper conditions and characteristics as endurance test grounds through the comparison and analysis of the endurance test and mobility roads at the front unit. It can be regarded that the evaluation of the driving duty levels and characteristics for the endurance test ground in mobility test fields and mobility roads in army operation areas includes not only the technical test for the powertrain system, but also the test condition that is to be verified in order to guarantee the reliability of the endurance test that affects the powertrain system.A previous study tried to achieve this goal based on wheeled vehicles.

In the case of wheeled vehicles, the same analysis technique can be applied to military trucks and jeeps that represent similar powertrain system mechanisms but there are limitations in the direct application to tracked vehicles due to the differences in powertrain mechanisms, such as vehicle specifications, engine and transmission characteristics, and driving styles [1�C2].This study measured the driving duties presented on a paved course, gravels, and a cross country course established at the Changwon Proving Ground for the mass-produced 000 tracked vehicle. This study also quantified the relative fatigue damages for the major elements of the powertrain system by applying Revolution Counting, Miner��s Rule, and cumulative fatigue damage theory using the torque converter output torque and engine rpm produced during the driving on the corresponding road based on the measurement results.

As a result, it provides important data for considering the endurance duties, including the guarantee of the self-design technique in the endurance test ground of powertrain systems and basic technique, for shortening the endurance test of the powertrain Cilengitide system, which reflects the duty characteristics of the mobility roads in army operation areas.2.?Measurement System and Results2.1. Configuration of the Measurement SystemAlthough the measurement of engine output torque is the most effective way to measure the load of a powertrain system, the measurement environmental conditions, such as high temperature and lack of space for the measurement, are generally insufficient. Thus, this study applied a method that calculates the torque converter output torque using gear ratios by measuring the output torque on a propeller shaft in order to perform an analysis of relative duties.