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An Evaluation of Tropical Cyclone Genesis Forecast over the Western North Pacific and the South China Sea from the CMA-TRAMS
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作者 李梦婕 陈子通 +4 位作者 戴光丰 田群 梁卓轩 林青 张艳霞 《Journal of Tropical Meteorology》 SCIE 2024年第1期20-28,共9页
Tropical cyclone(TC) genesis forecasting is essential for daily operational practices during the typhoon season.The updated version of the Tropical Regional Atmosphere Model for the South China Sea(CMA-TRAMS) offers f... Tropical cyclone(TC) genesis forecasting is essential for daily operational practices during the typhoon season.The updated version of the Tropical Regional Atmosphere Model for the South China Sea(CMA-TRAMS) offers forecasters reliable numerical weather prediction(NWP) products with improved configurations and fine resolution. While traditional evaluation of typhoon forecasts has focused on track and intensity, the increasing accuracy of TC genesis forecasts calls for more comprehensive evaluation methods to assess the reliability of these predictions. This study aims to evaluate the effectiveness of the CMA-TRAMS for cyclogenesis forecasts over the western North Pacific and South China Sea. Based on previous research and typhoon observation data over five years, a set of localized, objective criteria has been proposed. The analysis results indicate that the CMA-TRAMS demonstrated superiority in cyclogenesis forecasts, predicting 6 out of 22 TCs with a forecast lead time of up to 144 h. Additionally, over 80% of the total could be predicted 72 h in advance. The model also showed an average TC genesis position error of 218.3 km, comparable to the track errors of operational models according to the annual evaluation. The study also briefly investigated the forecast of Noul(2011). The forecast field of the CMA-TRAMS depicted thermal and dynamical conditions that could trigger typhoon genesis, consistent with the analysis field. The 96-hour forecast field of the CMA-TRAMS displayed a relatively organized threedimensional structure of the typhoon. These results can enhance understanding of the mechanism behind typhoon genesis,fine-tune model configurations and dynamical frameworks, and provide reliable forecasts for forecasters. 展开更多
关键词 CMA-TRAMS CYCLOGENESIS numerical weather prediction tropical cyclone
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放射性^(125)I粒子植入治疗特殊部位肝肿瘤的安全性及有效性 被引量:2
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作者 鲁月 周波 +3 位作者 陈紫彤 刘斌 陈超 李玉亮 《中国现代普通外科进展》 CAS 2023年第9期713-718,共6页
目的:评估放射性^(125)I粒子植入治疗特殊部位肝肿瘤的安全性及有效性。方法:分析2015年12月—2021年12月采用CT引导下放射性^(125)I粒子植入治疗49例60个特殊部位的肝脏肿瘤的临床资料。主要终点是总生存期(OS),次要终点包括无进展生存... 目的:评估放射性^(125)I粒子植入治疗特殊部位肝肿瘤的安全性及有效性。方法:分析2015年12月—2021年12月采用CT引导下放射性^(125)I粒子植入治疗49例60个特殊部位的肝脏肿瘤的临床资料。主要终点是总生存期(OS),次要终点包括无进展生存期(PFS)、疾病控制率(DCR)、客观缓解率(ORR)及肝内复发率(LRR),评估与肝内复发相关的潜在因素。结果:技术成功率为100%,少数患者出现了术后并发症,对症处理后好转。中位OS为12个月(95%CI:11.6612.34),中位PFS为12个月(95%CI:10.8713.13)。1年DCR、ORR和LRR分别为93.48%、60.87%和28.26%。治疗前与治疗后1个月的血液学指标差异无统计学意义(P>0.05)。对肿瘤复发相关因素行Cox单因素分析,结果显示肿瘤来源是影响患者肝内复发时间的因素(P=0.012)。结论:CT引导下放射性^(125)I粒子植入治疗特殊部位肝肿瘤,是一种安全、有效的治疗方法,具有较高的疾病控制率和良好的生存前景,值得临床上进一步推广应用。 展开更多
关键词 放射性^(125)I粒子 肝肿瘤 总生存期 局部肿瘤控制
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热带高分辨率模式(TRAMS-V3.0)技术方案及其系统预报性能 被引量:17
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作者 陈子通 徐道生 +3 位作者 戴光丰 张艳霞 钟水新 黄燕燕 《热带气象学报》 CSCD 北大核心 2020年第4期444-454,共11页
在原模式版本TRAMS-V2.0的基础上,通过对三维静力参考大气、拉格朗日矢量投影、云降水物理和辐射等技术方案进行改进,并且针对高分辨率模式易产生强垂直运动和小尺度扰动等问题,引入水平扩散、垂直运动耗散等技术方案,同时优化模式动力... 在原模式版本TRAMS-V2.0的基础上,通过对三维静力参考大气、拉格朗日矢量投影、云降水物理和辐射等技术方案进行改进,并且针对高分辨率模式易产生强垂直运动和小尺度扰动等问题,引入水平扩散、垂直运动耗散等技术方案,同时优化模式动力物理过程各功能块的调用方式和一些技术参数,最终形成适合热带高分辨率的模式版本TRAMS-V3.0。批量测试表明,新版模式TRAMS-V3.0的预报性能明显优于TRAMS-V2.0,新版模式不仅对形势场和地面要素的预报误差较小,而且各量级降水预报的准确率也比较高,如48小时2 m温度预报RMS由原来的2.4℃降低为1.8℃,晴雨48小时预报准确率由原来的0.736提高到0.810等。基于TRAMS-V3.0建立的预报系统,实时业务应用中展现了系统在晴雨、暴雨、地面要素等方面预报的优势。并针对暴雨空漏报等问题进行了初步的分析,提出下一步技术改进的设想。 展开更多
关键词 热带 高分辨率 数值预报 业务 暴雨
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采用预报涡旋的初始化方案对2015年台风“莲花”、“灿鸿”的试验研究 被引量:8
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作者 黄燕燕 薛纪善 +4 位作者 冯业荣 陈子通 张诚忠 李梦婕 李霁杭 《热带气象学报》 CSCD 北大核心 2018年第5期598-609,共12页
提出了一种采用预报涡旋的初始化方案,用预报涡旋代替bogus模型参与构建模式初始场,采用权重形式合成预报涡旋和分析涡旋获取台风初始涡旋。针对2015年"莲花"和"灿鸿"台风,基于该初始化方案设计了一系列对比试验进... 提出了一种采用预报涡旋的初始化方案,用预报涡旋代替bogus模型参与构建模式初始场,采用权重形式合成预报涡旋和分析涡旋获取台风初始涡旋。针对2015年"莲花"和"灿鸿"台风,基于该初始化方案设计了一系列对比试验进行数值模拟,并对结果进行分析。结果表明:(1)该方案得到的台风初始涡旋结构比bogus模型合理;(2)预报涡旋权重不宜取太大;(3)从长时效预报效果看,采用24 h内预报涡旋比采用长时效预报涡旋台风的路径和强度误差减小;(4)采用同一权重方案对"莲花"、"灿鸿"预报的改进效果不同,其原因与预报涡旋和分析涡旋的协调程度有关。多台风情形下可在初步评估的基础上采用不同时效的预报涡旋和不同权重方案。 展开更多
关键词 涡旋初始化 预报涡旋 合成方法 南海台风模式 数值模拟
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口服降糖药血糖控制不佳2型糖尿病患者联合1次胰岛素治疗方案的探讨 被引量:5
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作者 朱志宏 刘蔼文 +2 位作者 蔡钰玫 陈梓彤 陈立曙 《实用临床医学(江西)》 CAS 2019年第4期21-25,I0001,共6页
目的探讨2型糖尿病(T2D)患者口服降糖药(OAD)血糖控制不佳时联合1次胰岛素治疗的方案(1+OAD)选择。方法回顾性分析于汕头大学医学院第二附属医院2017年6月至2018年9月门诊就诊的T2D患者共71例,其原有降糖方案为磺脲类联合二甲双胍>3... 目的探讨2型糖尿病(T2D)患者口服降糖药(OAD)血糖控制不佳时联合1次胰岛素治疗的方案(1+OAD)选择。方法回顾性分析于汕头大学医学院第二附属医院2017年6月至2018年9月门诊就诊的T2D患者共71例,其原有降糖方案为磺脲类联合二甲双胍>3个月(均已增加至次大推荐剂量)血糖仍未达标,根据加用胰岛素剂型不同分为预混组和甘精组。预混组41例:晚餐前加用人预混胰岛素;甘精组30例:睡前加用甘精胰岛素。回顾12周治疗记录;比较加用胰岛素前(基线)和加用胰岛素12周后2组糖化血红蛋白(HbA1c)、空腹血糖(FPG)、体质量;比较2组平均胰岛素用量、低血糖事件,餐后2h血糖(PPG)及睡前血糖。结果预混组基线和加用胰岛素12周后HbA1c分别为(8.52±0.77)%和(7.10±0.56)%,FPG分别为(9.72±1.27)mmol·L^-1和(6.81±0.78)mmol·L^-1;甘精组基线和加用胰岛素12周后HbA1c分别为(8.41±0.70)%和(7.20±0.52)%,FPG分别为(9.63±1.48)mmol·L^-1和(6.87±0.64)mmol·L^-1。与基线比较,加用胰岛素12周后预混组和甘精组HbA1c(t=18.22,P=0.000;t=11.80,P=0.000)、FPG(t=18.50,P=0.000;t=12.68,P=0.000)均有明显下降;加用胰岛素12周后2组HbA1c、FPG下降幅度比较差异无统计学意义(t=-0.78,P=0.44;t=-0.35,P=0.73)。2组HbA1c达标率(HbA1c<7%)比较差异无统计学意义(χ^2=0.167,P=0.81)。预混组平均胰岛素用量为(0.28±0.06)U·kg^-1,甘精组平均胰岛素用量为(0.29±0.08)U·kg^-1,2组比较差异无统计学意义(t=-0.881,P=0.38)。预混组体质量平均增加(0.27±0.54)kg,甘精组体质量平均增加(0.37±0.45)kg,2组比较差异无统计学意义(t=-0.81,P=0.42)。2组均未发现严重低血糖事件,2组低血糖事件比较差异无统计学意义(χ^2=0.79,P=0.42)。2组PPG比较差异无统计学意义(t=-0.31,P=0.75),而预混组睡前血糖明显低于甘精组(t=-5.71,P=0.000)。结论对于口服磺脲类联合二甲双胍血糖控制不佳的T2D患者,在一定的血糖范围内,晚餐前加用1针预混胰岛素,与加用1针甘精胰岛素对比,胰岛素用量及降低FPG、HbA1c的效果相当,无增加低血糖风险,而预混组对控制晚餐后血糖效果更优。 展开更多
关键词 2型糖尿病 口服降糖药 预混胰岛素 甘精胰岛素 联合治疗
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不同降糖方案对2型糖尿病患者依从性及HbA1c达标率的影响 被引量:1
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作者 刘蔼文 蔡钰玫 +1 位作者 陈梓彤 朱志宏 《中国当代医药》 2019年第26期39-43,共5页
目的比较不同降糖方案对2型糖尿病(T2DM)患者依从性及糖化血红蛋白(HbA1c)达标率的影响。方法回顾性分析我院2017年6月~2018年9月门诊随访的120例T2DM患者资料,依据不同的治疗方法分为A组(单纯口服药物)、B组(磺脲类促泌剂+二甲双胍+预... 目的比较不同降糖方案对2型糖尿病(T2DM)患者依从性及糖化血红蛋白(HbA1c)达标率的影响。方法回顾性分析我院2017年6月~2018年9月门诊随访的120例T2DM患者资料,依据不同的治疗方法分为A组(单纯口服药物)、B组(磺脲类促泌剂+二甲双胍+预混胰岛素30 R晚餐前注射1次)、C组(磺脲类促泌剂+二甲双胍+甘精胰岛素晚餐注射1次)、D组(二甲双胍+预混胰岛素30 R早晚餐前各注射1次),每组各30例。回顾性分析近3个月的四组的血糖控制情况,期间可调整药物剂量,不更改用药方案,比较其血糖达标率及依从性,并分析依从性的影响因素。结果四组依从性比较,差异无统计学意义(χ2=1.445,P=0.963),血糖达标率比较,差异无统计学意义(χ2=0.372,P=0.946),再把各组按依从性好及不依从的患者分为两组,依从性好组HbA1c达标率明显高于依从性差组(t=11.012,P=0.000);单因素分析结果提示,患者受教育程度、经济状况及是否参加医保均影响患者的依从性(P=0.000)。应用Logistic回归分析结果提示,患者受教育程度、经济状况及是否参加医保,为依从性独立影响因素。结论四组治疗方案中依从性相似,糖化血红蛋白达标率相似,但这并不能说明该四种降糖方案效果相似,而应根据患者的个体差异选择不同的降糖方案;另外,在治疗方案恰当的情况下,依从性高的患者HbA1c达标率明显高于依从性低的患者;强化健康宣教、提高全民经济水平、全面推行门诊医疗保险制度可提高患者的依从性,从而优化治疗效果。 展开更多
关键词 2型糖尿病 糖化血红蛋白 依从性 治疗方案
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Verification and Assessment of Real-time Forecasts of Two Extreme Heavy Rain Events in Zhengzhou by Operational NWP Models 被引量:9
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作者 ZHONG Shui-xin ZHUANG Yan +9 位作者 HU Sheng chen zi-tong DING Wei-yu FENG Ye-rong DENG Tao LIU Xian-tong ZHANG Yan-xia XU Dao-sheng DAI Guang-feng MENG Wei-guang 《Journal of Tropical Meteorology》 SCIE 2021年第4期406-417,共12页
In the present study,the performances of the NWP models on two heavy rainfalls on 20 July and 22 August 2021 over Henan Province were investigated.The impacts of the water vapor transport to the extreme rainfall were ... In the present study,the performances of the NWP models on two heavy rainfalls on 20 July and 22 August 2021 over Henan Province were investigated.The impacts of the water vapor transport to the extreme rainfall were further discussed.The results showed that the regional model system in the Guangzhou Meteorological Service generally showed high scores on the extreme rainfall over Henan.The maximum 24h accumulative rainfall by the 24h forecasts by the CMA-GD reached 556 mm over Henan Province.The 24-h and 48-h Threat Score(TS)of heavy rainfall reached 0.56 and 0.64.The comparisons of the Fraction Skill Score(FSS)verifications of the heavy rainfall by CMA-GD and CMA-TRAMS at the radium of 40km reached 0.96 and 0.87.The water vapor transport to the extreme rainfall showed that the vertically integrated water vapor transport(IVT)of the whole layer before the occurrence of the heavy rainfall exhibited a double-eyes distribution in case 7·20.The north eye over Henan reached the same magnitude of IVT as the typhoon eye(Cempaka)over south China.The IVT over the lower troposphere(<500 hPa)showed an overwhelming magnitude than the upper level,especially in the planetary boundary layer(<700 hPa).More practical technique needs to be developed to improve its performances on the forecasting of extreme rainfall,as well as more experiments need to be conducted to examine the effects of the specific terrain and physical schemes on the extreme rainfall. 展开更多
关键词 extreme rainfall CMA-GD IVT double-eyes distribution
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A Review on GRAPES-TMM Operational Model System at Guangzhou Regional Meteorological Center 被引量:5
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作者 ZHONG Shui-xin chen zi-tong +8 位作者 XU Dao-sheng DAI Guang-feng MENG Wei-guang ZHANG cheng-zhong ZHANG Yan-xia WU Kai-xin FENG Ye-rong chen De-hui XUE Ji-shan 《Journal of Tropical Meteorology》 SCIE 2020年第4期495-504,共10页
This review summarizes the general developments of the operational mesoscale model system based on the Global/Regional Assimilation and Prediction System-Tropical Monsoon Model (GRAPES-TMM) at the Guangzhou Regional M... This review summarizes the general developments of the operational mesoscale model system based on the Global/Regional Assimilation and Prediction System-Tropical Monsoon Model (GRAPES-TMM) at the Guangzhou Regional Meteorological Center. GRAPES-TMM consists of the Tropical Regional Atmospheric Model System for the South China Sea (TRAMS, a typhoon model with a horizontal resolution of 9 km), the Mesoscale Atmospheric Regional Model System (MARS, 3km) and the fine-scale Rapid Update Cycling (RUC, 1km) forecasting system. The main advances of model dynamical core and physical processes are summarized, including the development of the 3D reference atmosphere scheme, the coupling scheme between dynamics and model physics, the calculation of nonlinear terms by fractional steps, the gravity wave drag scheme induced by sub-grid orography and a simplified model for landsurface scheme. The progress of model applications is reviewed and evaluated. The results show that the updated 9-3-1forecasting system provides an overall improved performance on the weather forecasting in south China, especially for typhoon-genesis and typhoon-track forecasting as well as short-range weather forecasting. Capabilities and limitations as well as the future development of the forecasting system are also discussed. 展开更多
关键词 GRAPES-TMM TRAMS physical processes 9-3-1 forecasting system
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A STUDY ON THE PREDICT ABILITY OF GRAPES MODEL OVER SOUTH CHINA: COMPARISONS BY TWO INITIALIZATION CONDITIONS BETWEEN ECMWF AND NCEP 被引量:3
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作者 ZHONG Shui-xin chen zi-tong 《Journal of Tropical Meteorology》 SCIE 2020年第1期27-34,共8页
This paper aims to assess the performances of different model initialization conditions(ICs)and lateral boundary conditions between two global models(GMs),i.e.,the European Centre for Medium-Range Weather Forecasts(EC... This paper aims to assess the performances of different model initialization conditions(ICs)and lateral boundary conditions between two global models(GMs),i.e.,the European Centre for Medium-Range Weather Forecasts(ECMWF)and National Centers for Environmental Prediction(NCEP),on the accuracy of the Global/Regional Assimilation and Prediction System(GRAPES)forecasts for south China.A total of 3-month simulations during the rainy season were examined and a specific case of torrential rain over Guangdong Province was verified.Both ICs exhibited cold biases over south China,as well as a strong dry bias over the Pearl River Delta(PRD).In particular,the ICs from the ECMWF had a stronger cold bias over the PRD region and a more detailed structure than NCEP.In general,the NCEP provided a realistic surface temperature compared to the ECMWF over south China.Moreover,GRAPES initialized by the NCEP had better simulations of both location and intensity of precipitation than by the ECWMF.The results presented in this paper could be used as a general guideline to the operational numerical weather prediction that uses regional models driven by the GMs. 展开更多
关键词 model initialization conditions GRAPES torrential rain cold bias
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Applicability of Temperature Discrete Equation to NMRF Boundary Layer Scheme in GRAPES Model 被引量:3
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作者 ZHANG Yan-xia chen zi-tong +1 位作者 MENG Wei-guang XU Dao-shen 《Journal of Tropical Meteorology》 SCIE 2022年第1期12-28,共17页
By deriving the discrete equation of the parameterized equation for the New Medium-Range Forecast(NMRF)boundary layer scheme in the GRAPES model,the adjusted discrete equation for temperature is obviously different fr... By deriving the discrete equation of the parameterized equation for the New Medium-Range Forecast(NMRF)boundary layer scheme in the GRAPES model,the adjusted discrete equation for temperature is obviously different from the original equation under the background of hydrostatic equilibrium and adiabatic hypothesis.In the present research,three discrete equations for temperature in the NMRF boundary layer scheme are applied,namely the original(hereafter NMRF),the adjustment(hereafter NMRF-gocp),and the one in the YSU boundary-layer scheme(hereafter NMRF-TZ).The results show that the deviations of height,temperature,U and V wind in the boundary layer in the NMRF-gocp and NMRF-TZ experiments are smaller than those in the NMRF experiment and the deviations in the NMRF-gocp experiment are the smallest.The deviations of humidity are complex for the different forecasting lead time in the three experiments.Moreover,there are obvious diurnal variations of deviations from these variables,where the diurnal variations of deviations from height and temperature are similar and those from U and V wind are also similar.However,the diurnal variation of humidity is relatively complicated.The root means square errors of 2m temperature(T2m)and 10m speed(V10m)from the three experiments show that the error of NMRF-gocp is the smallest and that of NMRF is the biggest.There is also a diurnal variation of T2m and V10m,where T2m has double peaks and V10m has only one peak.Comparison of the discrete equations between NMRF and NMRF-gocp experiments shows that the deviation of temperature is likely to be caused by the calculation of vertical eddy diffusive coefficients of heating,which also leads to the deviations of other elements. 展开更多
关键词 NMRF boundary layer scheme turbulent equation temperature discrete equation CMA-GD model
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新形势下校园冰雪运动推广研究 被引量:8
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作者 王东 陈姿彤 孟德翰 《冰雪运动》 2021年第5期76-79,共4页
校园冰雪运动推广是我国建设冰雪体育强国的重要内容。在2022年北京冬奥会背景下,我国正逐步向冰雪体育强国发展和前进。随着“三亿人参与冰雪运动”和“冰雪运动进校园”政策的颁布,让冰雪运动在校园繁荣发展是新形势下时代的召唤。从... 校园冰雪运动推广是我国建设冰雪体育强国的重要内容。在2022年北京冬奥会背景下,我国正逐步向冰雪体育强国发展和前进。随着“三亿人参与冰雪运动”和“冰雪运动进校园”政策的颁布,让冰雪运动在校园繁荣发展是新形势下时代的召唤。从校园冰雪运动发展的现状和存在的问题出发,探讨冰雪运动进校园的意义和推广普及途径,展望校园冰雪运动发展的未来,以期为推动全国冰雪运动进校园政策的落定和实施奠定基础。 展开更多
关键词 新形势 校园冰雪运动 推广
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Development of 1km-Scale Operational Model in South China 被引量:2
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作者 chen zi-tong DAI Guang-feng +2 位作者 WU Kai-xin ZHONG Shui-xin XU Dao-sheng 《Journal of Tropical Meteorology》 SCIE 2021年第4期319-329,共11页
To support short-range weather forecasts,a high-resolution model(1km)is developed and technically upgraded in the South China Regional Center,including the improvement of the 3D reference scheme and the predictor-corr... To support short-range weather forecasts,a high-resolution model(1km)is developed and technically upgraded in the South China Regional Center,including the improvement of the 3D reference scheme and the predictor-corrector method for semi-implicit semi-Lagrangian(SISL)in model dynamical core,as well as the improvement of physical parameterization.Furthermore,the multi-process parallel I/O and parallel nudging techniques are developed and have facilitated rapid updating in the assimilation prediction system and fast-output post processing process.The experimental results show that the improved 3D reference scheme and upgraded physic schemes can effectively improve the prediction accuracy and stability with a longer integration time step.The batch test shows that the precipitation forecast performance of 1-km model is significantly better than that of 3-km model.The 1-km model is in operation with a rapidly updating cycle at 12-minute intervals,which can be applied to short-range forecasts and nowcasting. 展开更多
关键词 numerical weather prediction reference atmosphere semi-implicit semi-Lagrangian rapidly updating cycle short-range forecast
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Performance Evaluation of the GRAPES Model in Wind Simulations Over South China 被引量:1
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作者 ZHONG Shui-xin chen zi-tong +6 位作者 DING Wei-yu XU Dao-sheng ZHANG Yan-xia WU Kai-xin LIANG Jia-hao TIAN Qun WANG Li-wen 《Journal of Tropical Meteorology》 SCIE 2021年第1期1-9,共9页
In the present study,the performance of the GRAPES model in wind simulation over south China was assessed.The simulations were evaluated by using surface observations and two sounding stations in south China.The resul... In the present study,the performance of the GRAPES model in wind simulation over south China was assessed.The simulations were evaluated by using surface observations and two sounding stations in south China.The results show that the GRAPES model could provide a reliable simulation of the distribution and diurnal variation of the wind.It showed a generally overestimated southerly wind speed especially over the Pearl River Delta region and the south of Jiangxi Province as well as the coastal region over south China.GRAPES also exhibited a large number of stations with the opposite surface wind directions over the east of Guangxi and the south of Jiangxi during the nocturnalto-morning period,as well as an overall overestimation of surface wind over the coastal regions during the afternoon.Although GRAPES could simulate the general evolutional characteristics of vertical wind profile,it underestimated wind speed above 900 hPa and overestimated wind speed below 900 hPa.Though the parameterization scheme of gravity wave drag proved to be an effective method to alleviate the systematic deviation of wind simulation,GRAPES still exhibited large errors in wind simulation,especially in the lower and upper troposphere. 展开更多
关键词 GRAPES wind simulation overestimated surface wind systematic deviation
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重型载货汽车行驶工况辨识策略 被引量:1
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作者 史培龙 陈子童 +1 位作者 符凯 赵轩 《长安大学学报(自然科学版)》 CAS CSCD 北大核心 2023年第3期125-133,共9页
针对山区公路行驶的重型载货汽车实现多种持续制动系统主动介入和退出时车辆行驶工况准确辨识,提出了基于隐形马尔科夫模型(HMM,hidden Markov model)和Tkagi-Sugeno模糊神经网络模型(T-S FNN)的双层复合保守行驶工况辨识策略。首先,选... 针对山区公路行驶的重型载货汽车实现多种持续制动系统主动介入和退出时车辆行驶工况准确辨识,提出了基于隐形马尔科夫模型(HMM,hidden Markov model)和Tkagi-Sugeno模糊神经网络模型(T-S FNN)的双层复合保守行驶工况辨识策略。首先,选取制动踏板平均开度、制动踏板作用比例、制动次数及平均单次制动时长表征时间窗内制动踏板动作特性,建立不同时间窗长度的HMM和T-S FNN的工况模型;其次,通过道路试验的方法,利用滚动时间窗原理和K-means空间聚类方法建立了上坡工况、小起伏路面工况和长大下坡工况,并对HMM和T-S FNN进行离线训练。为了验证提出的行驶工况辨识策略,进行了在线辨识验证。结果表明:与以HMM为主的辨识策略相比,双层复合保守识别策略对小起伏路面工况和长大下坡工况的辨识更加灵敏和准确。以HMM为主的辨识策略控制过程中,排气制动开启时间占总时长的91.72%,而以双层复合保守识别策略控制时排气制动开启时间占比下降了19.58%,开启次数为3,比前者少开启1次,鲁棒性能更优。 展开更多
关键词 汽车工程 重型载货汽车 行驶工况 隐马尔科夫模型 T-S模糊神经网络模型
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