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为准确复现某半挂牵引车车架铸造横梁试验场失效模式并提升结构可靠性,对典型工况静强度进行了分析;通过对比仿真结果与应力试验,验证了有限元模型准确性并发现了结构薄弱点,对结构进行了优化设计;建立了刚柔耦合的整车虚拟样机模型及试验场扭曲路面,提取了车架连接处载荷,结合惯性释放的方法完成了两种方案车架疲劳寿命计算,并进行了两种方案扭转疲劳台架试验。结果表明:改进方案在典型工况静强度、基于扭曲路面的虚拟疲劳寿命及基于台架试验的扭转疲劳寿命等方面均有较大提升,验证了改进方案的有效性。 相似文献
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某乘用车副车架在台架试验过程中出现早期开裂失效,根据该台架试验对应的副车架工况确定边界条件进行有限元静力分析,得到危险工况下的应力分布情况。通过电测试验验证有限元分析结果。根据有限元计算结果分析开裂原因,并提出对策。对改进后的副车架进行的台架试验证实,改进后开裂问题得到解决。 相似文献
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某厂重型电动轮矿用自卸车在使用过程中频繁出现发动机支架、变速箱支架、燃油箱支架与车架纵梁连接处开裂和撕裂现象,经分析疲劳损坏是支架与纵梁连接处焊缝开裂的主要原因。为了研究焊接参数、焊接工艺对焊接质量的影响,利用SDS1000电液伺服疲劳试验机,进行多次不同形式的疲劳拉伸实验,结果表明,采用多层焊接工艺成型的焊缝的疲劳寿命要优于单层焊焊缝的疲劳寿命。 相似文献
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为解决车架二横梁失效问题,文中首先建立了车架及其强度计算有限元模型,并通过车架模态和应力测试验证了车架及其强度计算有限元模型的正确性;然后,根据用户实际使用工况对车架进行了非线性强度计算,明确了二横梁失效的主要原因及初步优化方案;最后,结合车架用户道路载荷谱及二横梁材料疲劳寿命曲线的测试结果,采用CriticalPlane与Dirlik相结合的计算方法对改进方案进行了疲劳性能预测,并完成了用户道路试验。研究结果表明:不同用途及细分市场的车辆,有其自身预期的临界工况,计算工况与车辆实际使用工况接近是解决部件失效问题的关键,但根据用户使用工况及用途推荐相应定位产品的营销策略是避免部件失效问题的根本。 相似文献
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针对扭转梁开发过程中台架实验开裂问题,应用有限元分析和台架应力采集进行综合对比,调查开裂原因,再结合实际生产工艺提出整改方案。对整改方案进行CAE分析和样件台架验证可行性,经过方案多次优化最终解决扭转梁台架开裂问题。 相似文献
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L. Zhu Dr D. Toncich R. Nagarajah K. Romanski 《The International Journal of Advanced Manufacturing Technology》1997,13(10):696-707
This paper introduces a PID-like fuzzy controller model, which consists of only five fuzzy rules. Each fuzzy rule is designed to carry out a single control task. A self-learning procedure is used to determine the input scale factor for auto-tuning the system. A new performance criterion is suggested as an object function for the auto-tuning procedure. The features of this fuzzy controller, used in position control applications, are demonstrated by the simulation results of two different types of plants — a d.c. motor and an inverted pendulum.Nomenclature
adjusting parameter of AIAE
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C
I
integral control constant in ruleR
I
-
C
L
leading control constant in ruleR
zn
andR
zp
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C
P
proportional control constant in ruleR
P
andR
N
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D
ZE
domain of membership function
ZE
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K
a
adaptive adjusting constant ofC
L
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K
H
adjusting parameter for high-border of dynamic domain space
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K
L
adjusting parameter for low-border of dynamic domain space
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P
R
ramp input command
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P
S
step input command
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S
de
scaling factor for input variable de(change of error)
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S
e
scaling factor for input variablee(error)
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S
o
controller output scaling factor
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U
max
maximum output limit of fuzzy controller 相似文献
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Al2O3–50BaSO4–20Ag, Al2O3–50BaSO4–10SiO2, Al2O3–50(mass%)SrSO4, Al2O3–50PbSO4–5SiO2, Al2O3–50BaSO4 and Al2O3–50BaCrO4 composites (mass%) were prepared by spark plasma sintering and their microstructure and high-temperature tribological properties were evaluated. Al2O3–50BaSO4–20Ag composites (mass%) showed the lowest friction coefficients at the temperature ranging from 473 to 1073 K. Thin Ag film was observed on the wear tracks of the composites above 473 K. In addition, the friction coefficients of Al2O3 composites containing SrSO4 and PbSO4 were as low as those of Al2O3–BaSO4 and Al2O3–BaCrO4 composites at the temperatures up to 1073 K. The thin films formed on the wear tracks of the Al2O3–SrSO4 composites were composed of Al2O3 and SrSO4 phases, while the films formed on the wear tracks of the Al2O3–PbSO4–SiO2 composites consisted of Al2O3, PbSO4 and SiO2 phases. 相似文献
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