对象数学模型的准确程度，不能直接反映人体及其器官的感受程度。

The veracity of the object mathematic model cannot reflect the human body and organ sense directly.

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阐述了在点焊质量控制过程中，控制对象数学模型的建立过程及计算结果。

The paper deals with the establishment of mathematical model of spot welding for quality control.

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分析研究和实验结果表明，在缺乏对象数学模型的情况下，直流调速系统的智能控制是成功的。

Laboratory experiments and theoretical analysis show that AI control employing these ideas can be successfully applied in DC drive systems, even when plant models are unknown.

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