From the analysis of experiment data of the multi-axle vehicle chassis searching process, it is less accurate to predict multi-axle vehicle dynamic characteristic with simplified two-axle vehicle model. So it is impor...From the analysis of experiment data of the multi-axle vehicle chassis searching process, it is less accurate to predict multi-axle vehicle dynamic characteristic with simplified two-axle vehicle model. So it is important to find out a more effective modeling method in the study of multi-vehicle stability. In the development of heat transfer fluid（HTF） six-axle vehicle, a whole vehicle multi-body dynamic model is built through collaborate flowchart using Teamcenter Engineering, UG NX3 and MSC.Adams. The modeling method of connected hydragas spring suspension is validated by running test results. Based on this whole vehicle model, a kinematical analysis of suspension is implemented to achieve optimized suspension geometry parameters according to the stable requirement. Then, different handling simulations are carried out with regard to various tire characteristics, driving con- figurations, and equipments. According to the evaluation of whole vehicle handling characteristic, some design rules are summarized to improve the stability of multi-axle vehicle.展开更多
以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度...以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度,在多时间尺度下灵活规划发电主体出力。首先,日前调度以微电网经济性运行为目标,利用全生命周期理论建立经济模型,计及储能电池荷电状态(state of charge,SOC)对寿命的影响;其次,日内实时调度以供电稳定性为目标,充分考虑预测误差给系统带来的可能性崩溃,利用储能PQ源实时修正VF源的功率偏差,改善储能VF源的健康状态;最后,通过算例仿真,得到满足微电网经济、稳定运行的综合优化调度方案,并验证了该策略的有效性和合理性。展开更多
本试验以前期筛选获得的具有潜在抑菌和脱毒活性的副干酪乳杆菌LS2(Lactobacillus paracasei LS2)、植物乳杆菌S6-2(Lactiplantibacillus plantarum S6-2)和干酪乳杆菌GD2-1(Lactobacillus casei GD2-1)3株乳酸菌为研究对象,探讨其对全...本试验以前期筛选获得的具有潜在抑菌和脱毒活性的副干酪乳杆菌LS2(Lactobacillus paracasei LS2)、植物乳杆菌S6-2(Lactiplantibacillus plantarum S6-2)和干酪乳杆菌GD2-1(Lactobacillus casei GD2-1)3株乳酸菌为研究对象,探讨其对全株玉米青贮饲料有氧稳定性和霉菌毒素的影响。试验将田间遭受霉菌侵染(FI组)和霉菌未侵染(NFI组)全株玉米分别进行以下接种剂处理:1)未接种乳酸菌对照(CON处理);2)接种副干酪乳杆菌LS2(LS2处理);3)接种植物乳杆菌S6-2(S6-2处理);4)接种干酪乳杆菌GD2-1(GD2-1处理)。青贮180 d后开窖,将各组青贮饲料暴露于空气中4 d,期间动态取样分析全株玉米青贮饲料的发酵参数、化学组分、微生物数量和霉菌毒素含量。结果表明:1)无论是否遭受霉菌侵染,LS2处理有氧暴露4 d后全株玉米青贮饲料pH最低;NFI组中LS2处理乳酸和乙酸含量最高。2)NFI组S6-2和GD2-1处理酵母菌和霉菌数量在有氧暴露第2天时快速上升,之后GD2-1处理保持稳定,而S6-2处理略有下降;FI组各处理酵母菌和霉菌数量在有氧暴露期间整体呈现上升趋势。3)田间霉菌侵染显著提高了全株玉米青贮饲料黄曲霉毒素B 1(AFB 1)含量(P<0.05),各乳酸菌接种剂处理显著降低了AFB 1含量(P<0.05),GD2-1处理降低了玉米赤霉烯酮含量(P<0.05),而GD2-1处理显著降低了呕吐毒素含量(P<0.05)。4)无论是否遭受霉菌侵染,LS2处理均维持了最长的有氧稳定时间,有氧稳定性显著高于其他处理(P<0.05)。综上所述,青贮饲料有氧暴露后,田间霉菌侵染使全株玉米青贮饲料品质进一步下降并导致有氧腐败提前;无论是否遭受霉菌侵染,接种副干酪乳杆菌LS2的全株玉米青贮饲料在有氧暴露期间始终保持着较高的乳酸和乙酸含量,并维持了最高的有氧稳定性。展开更多
文摘From the analysis of experiment data of the multi-axle vehicle chassis searching process, it is less accurate to predict multi-axle vehicle dynamic characteristic with simplified two-axle vehicle model. So it is important to find out a more effective modeling method in the study of multi-vehicle stability. In the development of heat transfer fluid（HTF） six-axle vehicle, a whole vehicle multi-body dynamic model is built through collaborate flowchart using Teamcenter Engineering, UG NX3 and MSC.Adams. The modeling method of connected hydragas spring suspension is validated by running test results. Based on this whole vehicle model, a kinematical analysis of suspension is implemented to achieve optimized suspension geometry parameters according to the stable requirement. Then, different handling simulations are carried out with regard to various tire characteristics, driving con- figurations, and equipments. According to the evaluation of whole vehicle handling characteristic, some design rules are summarized to improve the stability of multi-axle vehicle.
文摘以新能源为主体的微电网系统存在前期资本投入大、电网刚性不足等问题,特别是离网型微电网由于失去大电网的支撑,安全稳定运行面临更大的挑战。本文针对离网型交流微电网设计了双层调度策略,即经济最优化日前调度和日内稳定运行实时调度,在多时间尺度下灵活规划发电主体出力。首先,日前调度以微电网经济性运行为目标,利用全生命周期理论建立经济模型,计及储能电池荷电状态(state of charge,SOC)对寿命的影响;其次,日内实时调度以供电稳定性为目标,充分考虑预测误差给系统带来的可能性崩溃,利用储能PQ源实时修正VF源的功率偏差,改善储能VF源的健康状态;最后,通过算例仿真,得到满足微电网经济、稳定运行的综合优化调度方案,并验证了该策略的有效性和合理性。
