Some industrial equipments are required by the human operation such as bulldozers, excavators and cranes. Construction machines with better operability are necessary to improve productivity. Evaluations of those operational equipments are performed to obtain the better operability by subjective evaluations of the specific evaluator at the design stage. However, subjective evaluations require the skill of evaluator or a lot of sample data. In this paper, relationships between approximated parameters expressed as a low order system and subjective evaluations are verified by using the Weber-Fechner law. The evaluated motion is the boom up motion for an excavator. The simulator for the boom motion has been made because the real excavator has the limited condition. Therefore, the evaluation is performed numerically and experimentally. Approximated system parameters for the real excavator are calculated by the genetic algorithm.
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