“七·五”国家攻关专题“轮式装载机CAD系统”部分成果于1990年2月20日在天津通过鉴定。鉴定的分专题和分专题子项有: 1.装载机液压系统CAD研究; 2.发动机低温启动设计规范的研究; 3.多路阀仿真试验研究; 4.装载机总体参数专家系统子项; 5.95OB装载机工作装置应力谱分析及有限元寿命估算子项; 6.叶栅系统单级向心漏液力变矩器子项; The results of the “7th Five-Year Plan” national research topic “wheel loader CAD system” were passed on February 20, 1990 in Tianjin. The sub-topics and topic sub-topics of the appraisal include: 1. CAD study of loader hydraulic system; 2. research on engine cold start design specification; 3. multi-way valve simulation test study; 4. loader overall parameter expert system sub-item; 5.95 OB loader work device stress spectrum analysis and finite element life estimation sub-item; 6. Cascade system single-stage leakage flow torque converter sub-item;