In order to improve ride comfort and handling performance of the vehicle, an adaptive hybrid control algorithm is proposed for semi-active suspension systems. The virtues of sky-hook is combined with ground-hook contr...In order to improve ride comfort and handling performance of the vehicle, an adaptive hybrid control algorithm is proposed for semi-active suspension systems. The virtues of sky-hook is combined with ground-hook control strategies and a more suitable compromise for the suspension systems is chosen. The hybrid coefficient is tuned according to the longitudinal and lateral acceleration so as to improve the vehicle stability especially in high speed conditions. Damping continuous adjustable absorber is used to continuously control the damping force so as to eliminate the damping force jerk instead of traditional on-off control policy. Based on suspension stroke measured by sensors, unscented Kalman filter is designed to estimate the suspension states in real-time for the realization of hybrid control, which improves the robustness of the control strategy and is adaptive to different types of road profiles. Finally, the proposed control algorithm is validated under the following two typical road profiles: half-sine speed bump road and the random road. The simulation results indicate that the hybrid control algorithm could offer a good coordination between ride comfort and handling of the vehicle.展开更多
本文建立了液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry,LC-MS/MS)检测鱼肉中氯霉素残留的分析方法。试样经乙酸乙酯提取,氮吹浓缩后通过QuEChERS净化,C_(18)色谱柱分离,以水和甲醇为流动相进行洗脱,电喷雾负...本文建立了液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry,LC-MS/MS)检测鱼肉中氯霉素残留的分析方法。试样经乙酸乙酯提取,氮吹浓缩后通过QuEChERS净化,C_(18)色谱柱分离,以水和甲醇为流动相进行洗脱,电喷雾负离子模式检测,溶剂内标法定量。结果表明,氯霉素在1~20 ng/mL线性范围内线性关系良好,检出限为0.2μg/kg,定量限为0.5μg/kg,3个水平浓度加标下的平均回收率在88.0%~91.0%之间,相对标准偏差为3.39%~5.28%(n=6)。该方法具有前处理简便、基质效应低、准确性高等优点,可用于批量水产品中氯霉素药物残留检测。展开更多
文摘目的建立高效液相色谱-串联质谱法快速测定粮油制品中黄曲霉毒素B1含量的分析方法。方法样品中的黄曲霉毒素B1经提取、免疫亲和柱净化、浓缩等步骤,以5 mmol/L乙酸铵溶液、乙腈-甲醇溶液(50:50,V:V)为流动相,按照梯度洗脱程序,通过液相色谱-串联质谱法进行测定,外标法定量。结果黄曲霉毒素B1在0.2~20ng/mL浓度范围内与峰面积呈现良好的线性关系,线性方程为Y=68577.3X-20845,r>0.998,加标回收率在85.0%~94.1%之间,相对标准偏差(relative standard deviation, RSD)<5.5%,方法检出限和定量限分别为0.07和0.2μg/kg。结论该方法测定结果准确、可靠,可用于快速测定粮油制品中黄曲霉毒素B1的含量。
基金Projects(51375046,51205021)supported by the National Natural Science Foundation of China
文摘In order to improve ride comfort and handling performance of the vehicle, an adaptive hybrid control algorithm is proposed for semi-active suspension systems. The virtues of sky-hook is combined with ground-hook control strategies and a more suitable compromise for the suspension systems is chosen. The hybrid coefficient is tuned according to the longitudinal and lateral acceleration so as to improve the vehicle stability especially in high speed conditions. Damping continuous adjustable absorber is used to continuously control the damping force so as to eliminate the damping force jerk instead of traditional on-off control policy. Based on suspension stroke measured by sensors, unscented Kalman filter is designed to estimate the suspension states in real-time for the realization of hybrid control, which improves the robustness of the control strategy and is adaptive to different types of road profiles. Finally, the proposed control algorithm is validated under the following two typical road profiles: half-sine speed bump road and the random road. The simulation results indicate that the hybrid control algorithm could offer a good coordination between ride comfort and handling of the vehicle.
文摘本文建立了液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry,LC-MS/MS)检测鱼肉中氯霉素残留的分析方法。试样经乙酸乙酯提取,氮吹浓缩后通过QuEChERS净化,C_(18)色谱柱分离,以水和甲醇为流动相进行洗脱,电喷雾负离子模式检测,溶剂内标法定量。结果表明,氯霉素在1~20 ng/mL线性范围内线性关系良好,检出限为0.2μg/kg,定量限为0.5μg/kg,3个水平浓度加标下的平均回收率在88.0%~91.0%之间,相对标准偏差为3.39%~5.28%(n=6)。该方法具有前处理简便、基质效应低、准确性高等优点,可用于批量水产品中氯霉素药物残留检测。
