根据非参数刚体接触-分离的转动副间隙分析模型,以间隙变化量大且对平衡力施加变化最敏感的转动副作为研究对象,对200 k N小型压力机所需的最佳平衡力进行了研究。为了确定压力机所需的最佳平衡力,从间隙角位移、间隙角速度、滑块运动...根据非参数刚体接触-分离的转动副间隙分析模型,以间隙变化量大且对平衡力施加变化最敏感的转动副作为研究对象,对200 k N小型压力机所需的最佳平衡力进行了研究。为了确定压力机所需的最佳平衡力,从间隙角位移、间隙角速度、滑块运动误差和间隙碰撞力4个方面给出了间隙变化的评价指标。通过在滑块上施加不同的平衡力,分析4个间隙评价指标的变化,确定了施加给压力机滑块的最佳平衡力。最后,应用Adams仿真,验证了针对偏置六连杆机构拉深成形压力机,采用该间隙模型预测压力机的最佳平衡力是合理可行的。展开更多
The Three Gorges Project（TGP） ship lift employs 4 safety mechanisms, of which one consists of a rotary locking screw and a nut jaw column. The thread pair clearance（TPC） of safety mechanisms is set at 60 mm. Owing...The Three Gorges Project（TGP） ship lift employs 4 safety mechanisms, of which one consists of a rotary locking screw and a nut jaw column. The thread pair clearance（TPC） of safety mechanisms is set at 60 mm. Owing to influential factors,the TPC changes randomly in the upward/downward-stroke of the ship chamber. If it diminished to 0, the safety mechanism would be jammed, thus resulting in disastrous accidents. By the bearing test of the drive system, 7 influential factors have been studied; 15 other influential factors（including 8 factors of manufacture and installation deviation, 3 factors of chamber offset, 2 factors of external load and 2 factors of wear） have been analyzed based on the design data. Results by the limit superposition reveal that the TPC change varies from -43.8 mm to ＋48.4 mm when the water level of the chamber ranges from 3.4 m to 3.6 m. According to the Gaussian distribution, the probability of the TPC change varied from -53.7 mm to ＋58.8 mm in the most detrimental status is99.74%, therefore, the TPC remains in a safe condition. This paper puts forward that two-phase operation of the drive system should be adopted so as to reduce the maximum TPC change to -44.6 mm.展开更多
文摘根据非参数刚体接触-分离的转动副间隙分析模型,以间隙变化量大且对平衡力施加变化最敏感的转动副作为研究对象,对200 k N小型压力机所需的最佳平衡力进行了研究。为了确定压力机所需的最佳平衡力,从间隙角位移、间隙角速度、滑块运动误差和间隙碰撞力4个方面给出了间隙变化的评价指标。通过在滑块上施加不同的平衡力,分析4个间隙评价指标的变化,确定了施加给压力机滑块的最佳平衡力。最后,应用Adams仿真,验证了针对偏置六连杆机构拉深成形压力机,采用该间隙模型预测压力机的最佳平衡力是合理可行的。
基金Supported by the Key Research Program of State Power Corporation(SPKJ016-06)the Key Scientific Research Project of Hubei Province(2004AC1O1D31)the Key Scientific Research Project of China Three Gorges Corporation(0722018)
文摘The Three Gorges Project（TGP） ship lift employs 4 safety mechanisms, of which one consists of a rotary locking screw and a nut jaw column. The thread pair clearance（TPC） of safety mechanisms is set at 60 mm. Owing to influential factors,the TPC changes randomly in the upward/downward-stroke of the ship chamber. If it diminished to 0, the safety mechanism would be jammed, thus resulting in disastrous accidents. By the bearing test of the drive system, 7 influential factors have been studied; 15 other influential factors（including 8 factors of manufacture and installation deviation, 3 factors of chamber offset, 2 factors of external load and 2 factors of wear） have been analyzed based on the design data. Results by the limit superposition reveal that the TPC change varies from -43.8 mm to ＋48.4 mm when the water level of the chamber ranges from 3.4 m to 3.6 m. According to the Gaussian distribution, the probability of the TPC change varied from -53.7 mm to ＋58.8 mm in the most detrimental status is99.74%, therefore, the TPC remains in a safe condition. This paper puts forward that two-phase operation of the drive system should be adopted so as to reduce the maximum TPC change to -44.6 mm.
