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设备比对作为一种有效的质量监控方法,在汽车检测行业得到了广泛应用.众所周知,影响整车排放检测结果的因素较多,试验结果的偏差较大;但因排放检测设备价值昂贵,具备两套及以上排放检测设备的实验室较少,因此,在进行质量监控时,受检测设备数量的限制,难以选择设备比对的方式.本文以5家实验室比对的数据为例,选择其中的极端数据模拟进行两套设备间的设备比对,得出了假设检验用于设备比对的分析方法,并给出了试验数据的置信区间.与实验室间比对结果相比,使用该方法进行两套设备间的比对,比对结果可信. 相似文献
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To simulate two-dimensional free-surface flows with complex boundaries directly and accurately, a novel VOF (Volume-of-fluid) method based on unstructured quadrilateral mesh is presented. Without introducing any complicated boundary treatment or artificial diffusion, this method treated curved boundaries directly by utilizing the inherent merit of unstructured mesh in fitting curves. The PLIC (Piecewise Linear Interface Calculation) method was adopted to obtain a second-order accurate linearized reconstruction approximation and the MLER (Modified Lagrangian-Eulerian Re-map) method was introduced to advect fluid volumes on unstructured mesh. Moreover, an analytical relation for the interface’s line constant vs. the volume clipped by the interface was developed so as to improve the method’s efficiency. To validate this method, a comprehensive series of large straining advection tests were performed. Numerical results provide convincing evidences for the method’s high volume conservative accuracy and second-order shape error convergence rate. Also, a dramatic improvement on computational accuracy over its unstructured triangular mesh counterpart is checked. 相似文献
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应对全球气候变暖,降低由于人类活动加剧所带来的环境污染问题,节能减排成为全世界人类的共同应对议题。2020年,第75届联合国大会明确指出,我国二氧化碳排放将会在2030年达到碳达峰,2060年实现碳中和,即在2060年实现双碳发展目标。相关数据研究调查表明,我国交通领域的二氧化碳排放总量在全社会碳排放总量上占比达到了11%,由此交通运输行业也成为减排的重要行业之一,除了需要相关政策来改善交通运输的产业结构,还需要基于交通管理这一角度,协调好交通运输事业发展和节能减排之间的关系。基于此,文章针对双碳目标下的交通运输管理展开相应的探讨和研究,并提出管理策略,供参考。 相似文献
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