期刊文献+
共找到26篇文章
< 1 2 >
每页显示 20 50 100
Impacts of automated passenger cars on the capacity of a freeway basic section: applicability in the determination of vehicle adjustment factors in mixed traffic
1
作者 Sia M.Lyimo Valerian Kwigizile +1 位作者 Jun-Seok Oh Zachary D.Asher 《Digital Transportation and Safety》 2023年第4期298-307,共10页
The highway capacity manual(HCM)provides a formula to calculate the heavy vehicle adjustment factor(fHV)as a function of passenger car equivalent factors for the heavy vehicle(ET).However,a significant drawback is tha... The highway capacity manual(HCM)provides a formula to calculate the heavy vehicle adjustment factor(fHV)as a function of passenger car equivalent factors for the heavy vehicle(ET).However,a significant drawback is that the methodology was established solely based on human-driven passenger cars(HDPC)and human-driven heavy vehicles(HDHV).Due to automated passenger cars(APCs),a new adjustment factor(fAV)might be expected.This study simulated traffic flows at different percentages of HDHVs and APCs to investigate the impacts of HDHVs and APCs on freeway capacity by analyzing their influence on fHV and fAV values.The simulation determined observed adjustment factors at different percentages of HDHVs and APCs(fobserved).The HCM formula was used to calculate(fHCM).Modifications to the HCM formula are proposed,and vehicle adjustment factors due to HDHVs and APCs were calculated(fproposed).Results showed that,in the presence of APCs,while fobserved and fHCM were statistically significantly different,fobserved and fproposed were statistically equal.Hence,this study recommends using the proposed formula when determining vehicle adjustment factors(fproposed)due to HDHVs and APCs in the traffic stream. 展开更多
关键词 Connected and automated vehicles Adjustment factors passenger car equivalent factors Automated passenger cars Freeway operation
下载PDF
NUMERICAL ANALYSIS OF NONLINEAR STABILITY FOR RAILWAY PASSENGER CARS 被引量:8
2
作者 Zeng Jing National Traction Power Laboratory, Southwest Jiaotong University 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2001年第2期97-101,共5页
The Newton Raphson iteration and QR algorithm are combined to search the Hpf bifurcation point of the vehicle running on straight track and on large radius curved tracks. Limit cycles that are bifurcated from the equ... The Newton Raphson iteration and QR algorithm are combined to search the Hpf bifurcation point of the vehicle running on straight track and on large radius curved tracks. Limit cycles that are bifurcated from the equilibrium points and the saddle node bifurcation point are computed through employing a variable step Runge Kutta method and the Poincaré map. Finally, numerical simulations are carried out for the stability of a high speed passenger car operating on straight and large radius curved tracks. The influences of the radius of curvature and the superelevation of the track on the stability of the vehicle system are investigated. 展开更多
关键词 Railway passenger car STABILITY BIFURCATION Limit cycle Critical speed
下载PDF
STUDY ON DYNAMIC CURVING BEHAVIOR OF TILTING PASSENGER CARS
3
作者 Liu Hongyou Zeng Jing National Traction Power Laboratory, Southwest Jiaotong University, Chengdu 610031, China 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2002年第4期360-365,371,共7页
By using tilting carbodies, train can negotiate at a higher speed withoutreducing the passenger's ride quality. This is a good method to allow a significant increase inspeed at existing track to improve the railwa... By using tilting carbodies, train can negotiate at a higher speed withoutreducing the passenger's ride quality. This is a good method to allow a significant increase inspeed at existing track to improve the railway transportation capability, and to enhance thecompetition ability of railways with other transportation systems. With the increase of the curvenegotiation speed, the wheel-rail lateral forces and wheel-rail wear of the tilting train willincrease. The self-steering radial bogie is an effective way to solve the problem. The dynamic modelof the tilting passenger car with self-steering bogies is established in detail, and the curvingperformance of the car is investigated. 展开更多
关键词 tilting passenger car self-steering bogie dynamic curving behavior wheel-rail interaction
下载PDF
Kinematic and Kinetic Analysis for the Tilting Mechanism of Railway Passenger Cars
4
作者 邬平波 曾京 刘宏友 《Journal of Modern Transportation》 2000年第1期92-98,共7页
The kinematics and kinetics of the tilting mechanism of railway passenger cars are studied. The parameters of the mechanism are given. The motions of the actuator, the center of gravity of the carbody and the center o... The kinematics and kinetics of the tilting mechanism of railway passenger cars are studied. The parameters of the mechanism are given. The motions of the actuator, the center of gravity of the carbody and the center of coupler are calculated. Finally, the maximum driving force, output power and velocity of the actuator are discussed in detail. 展开更多
关键词 KINEMATICS KINETICS tilting mechanism railway passenger car
下载PDF
Characterization of particulate matter from diesel passenger cars tested on chassis dynamometers 被引量:4
5
作者 Sungwoon Jung Jaehyun Lim +4 位作者 Sangil Kwon Sangwoo Jeon Jeongsoo Kim Jongtae Lee Sunmoon Kim 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2017年第4期21-32,共12页
Emission characterization of particle number as well as particle mass from three diesel passenger cars equipped with diesel particulate filter(DPF), diesel oxidation catalyst(DOC)and exhaust gas recirculation(EGR... Emission characterization of particle number as well as particle mass from three diesel passenger cars equipped with diesel particulate filter(DPF), diesel oxidation catalyst(DOC)and exhaust gas recirculation(EGR) under the vehicle driving cycles and regulatory cycle.Total particle number emissions(PNEs) decreased gradually during speed-up of vehicle from 17.3 to 97.3 km/hr. As the average vehicle speed increases, the size-segregated peak of particle number concentration shifts to smaller size ranges of particles. The correlation analysis with various particulate components such as particle number concentration(PNC),ultrafine particle number concentration(UFPNC) and particulate matter(PM) mass was conducted to compare gaseous compounds(CO, CO2, HC and NOx). The UFPNC and PM were not only emitted highly in Seoul during severe traffic jam conditions, but also have good correlation with hydrocarbons and NOxinfluencing high potential on secondary aerosol generation. The effect of the dilution temperature on total PNC under the New European Driving Cycle(NEDC), was slightly higher than the dilution ratio. In addition, the nuclei mode(DP: ≤ 13 nm) was confirmed to be more sensitive to the dilution temperature rather than other particle size ranges. Comparison with particle composition between vehicle speed cycles and regulatory cycle showed that sulfate was slightly increased at regulatory cycle, while other components were relatively similar. During cold start test, semivolatile nucleation particles were increased due to effect of cold environment. Research on particle formation dependent on dilution conditions of diesel passenger cars under the NEDC is important to verify impact on vehicular traffic and secondary aerosol formation in Seoul. 展开更多
关键词 Diesel passenger cars Particle number emissions Correlation analysis Particle number concentration Ultrafine particle number concentration
原文传递
Production and Sales of Domestic Passenger Cars, Jan. to June, 1997
6
《中国汽车(英文版)》 1997年第4期22-22,共1页
关键词 JUN RATE JAN Production and Sales of Domestic passenger cars
原文传递
Production and Sales of Domestic Passenger Cars Jan. to Nov. 1997
7
《中国汽车(英文版)》 1997年第6期20-20,共1页
关键词 Production and Sales of Domestic passenger cars Jan to Nov
原文传递
Production and Sales of Domestically-made Passenger Cars Jan. to Aug., 1997
8
《中国汽车(英文版)》 1997年第5期24-24,共1页
关键词 Production and Sales of Domestically-made passenger cars Jan to Aug
原文传递
Production and Sales of Domestically-made Passenger Cars Aug. 1997
9
《中国汽车(英文版)》 1997年第5期24-24,共1页
关键词 Production and Sales of Domestically-made passenger cars Aug
原文传递
Production and Sales of Domestic Passenger Cars Nov. 1997
10
《中国汽车(英文版)》 1997年第6期20-20,共1页
关键词 Production and Sales of Domestic passenger cars Nov
原文传递
Production and Sales of Domestically-made Passenger Cars in June, 1997
11
《中国汽车(英文版)》 1997年第4期22-22,共1页
关键词 Production and Sales of Domestically-made passenger cars in June
原文传递
Explicit–Implicit Co-Simulation Techniques for Dynamic Responses of a Passenger Car on Arbitrary Road Surfaces 被引量:2
12
作者 Hongzhou Hu Zhihua Zhong 《Engineering》 SCIE EI 2019年第6期1171-1178,共8页
To study the durability of a passenger car, this work investigates numerical simulation techniques. The investigations are based on an explicit implicit approach in which substructure techniques are used to reduce the... To study the durability of a passenger car, this work investigates numerical simulation techniques. The investigations are based on an explicit implicit approach in which substructure techniques are used to reduce the simulation time, allowing full vehicle dynamic analyses to be performed on a timescale that is dif cult or impossible with the conventional nite element model (FEM). The model used here includes all necessary nonlinearities in order to maintain accuracy. All key components of the car structure are modeled with deformable materials. Tire road interactions are modeled in the explicit package with contact-impact interfaces with arbitrary frictional and geometric properties. Key parameters of the responses of the car driven on six different kinds of test road surfaces are examined and compared with experimental values. It can be concluded that the explicit implicit co-simulation techniques used here are ef cient and accurate enough for engineering purposes. This paper also discusses the limitations of the proposed method and outlines possible improvements for future work. 展开更多
关键词 Durability study Dynamic responses passenger car Explicit–implicit co-simulation Contact-impact Friction SUBSTRUCTURES
下载PDF
Performance Development Target Setting of Passenger Car Diesel Engine
13
作者 ZHENG Guangyong YU Xiumin +2 位作者 LIU Jiangwei SONG Tao LI Wenxiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2013年第3期512-517,共6页
Setting engine emission targets to meet diesel car requirements is particularly important in engine performance development phase. Many researches are focused on associating vehicle performance with engine targets, bu... Setting engine emission targets to meet diesel car requirements is particularly important in engine performance development phase. Many researches are focused on associating vehicle performance with engine targets, but most work is done by testing, which is time and cost consuming, furthermore, the relationship of vehicle and engine will change when either engine or vehicle changes. A GT-Drive model to simulate New European Driving Cycle (NEDC) for passenger car is developed and calibrated by testing data, model precision is controlled within 5%. Time distribution of engine operating conditions when car running NEDC cycle has been analyzed, 10 critical major engine operating points are summarized according to running time proportion. Emission of NOx and smoke control regions containing these 10 points for target engine are set. Vehicle emissions are simulated and evaluated during engine development after engine performance test data are got, and engine combustion system layout and calibration are adjusted until vehicle targets are met. Vehicle is tested in chassis dynamometer finally, the testing results show a good agreement with the simulated results with an error of less than 5%, which proves that the emission value exchange of vehicle and engine is reliable. Performance target decomposition method for passenger car diesel presented can greatly shorten the development cycle and save costs. 展开更多
关键词 passenger car diesel engine emission target New European Driving Cycle simulation analysis
下载PDF
Dongfeng to Form an “Aircraft Carrier” of Passenger Car Chassis Makers
14
《China's Foreign Trade》 2001年第7期35-35,共1页
关键词 of passenger Car Chassis Makers FORM Aircraft Carrier Dongfeng to Form an
下载PDF
Estimation of Passenger Car Equivalents for Basic Freeway Sections at Different Traffic Conditions
15
作者 Jalal Taqi Shaker Al-Obaedi 《World Journal of Engineering and Technology》 2016年第2期153-159,共7页
Passenger car equivalent (PCE) is an important factor which is used to convert traffic volumes containing proportions of heavy good vehicles (HGVs) to a unify measure containing only passenger cars units (PCU). This p... Passenger car equivalent (PCE) is an important factor which is used to convert traffic volumes containing proportions of heavy good vehicles (HGVs) to a unify measure containing only passenger cars units (PCU). This paper uses large data base of real traffic raw data extracted from loop detector before being aggregated to estimate PCEs. These detectors are located on the M25 and the M42 motorway sites in the United Kingdom. The selected sites represent basic freeway segments as they are far away from the influence of entrance (on ramp) and exit (off ramp) sections. The data are filtered properly so as to estimate passenger car equivalents (PCEs) using lagging headway method for close following situations at different speed ranges. The results suggest that for the same location, the equivalency factors are varies significantly based traffic speed. However, it is proved that such variation with traffic speed is influenced by the differences in lengths between HGVs and cars. Regression models have also been developed linking the PCEs with traffic speed. 展开更多
关键词 passenger Car Unit passenger Car Equivalent Trucks Equivalency Factor Lagging Headway Close Following
下载PDF
China June Passenger Car Sales Rise 29% on Discounts
16
《China's Foreign Trade》 2007年第14期32-32,共1页
China's passenger car sales rose 29% in June as automakers cut prices to lure consumers.
关键词 China's passenger car sales automaker prices consumers
下载PDF
Virtual Reconstruction of Long Bone Fracture in Car-to-pedestrian Collisions Using Multi-body System and Finite Element Method 被引量:10
17
作者 HAN Yong YANG Jikuang MIZUNO Koji 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2011年第6期1045-1055,共11页
Lower limb injures are frequently observed in passenger car traffic accidents.Previous studies of the injuries focus on long bone fractures by using either cadaver component tests or simulations of the long bone kinem... Lower limb injures are frequently observed in passenger car traffic accidents.Previous studies of the injuries focus on long bone fractures by using either cadaver component tests or simulations of the long bone kinematics,which lack in-depth study on the fractures in stress analysis.This paper aims to investigate lower limb impact biomechanics in real-world car to pedestrian accidents and to predict fractures of long bones in term of stress parameter for femur,tibia,and fibula.For the above purposes,a 3D finite element(FE) model of human body lower limb(HBM-LL) is developed based on human anatomy.The model consists of the pelvis,femur,tibia,fibula,patella,foot bones,primary tendons,knee joint capsule,meniscus,and ligaments.The FE model is validated by comparing the results from a lateral impact between simulations and tests with cadaver lower limb specimens.Two real-world accidents are selected from an in-depth accident database with detailed information about the accident scene,car impact speed,damage to the car,and pedestrian injuries.Multi-body system(MBS) models are used to reconstruct the kinematics of the pedestrians in the two accidents and the impact conditions are calculated for initial impact velocity and orientations of the car and pedestrian during the collision.The FE model is used to perform injury reconstructions and predict the fractures by using physical parameters,such as von Mises stress of long bones.The calculated failure level of the long bones is correlated with the injury outcomes observed from the two accident cases.The reconstruction result shows that the HBM-LL FE model has acceptable biofidelity and can be applied to predict the risk of long bone fractures.This study provides an efficient methodology to investigate the long bone fracture suffered from vehicle traffic collisions. 展开更多
关键词 passenger car pedestrian accident lower limb FE model long bone fracture impact biomechanics
下载PDF
New Leiderman–Khlystov Coefficients for Estimating Engine Full Load Characteristics and Performance
18
作者 Dariusz Szpica 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2019年第6期192-205,共14页
The paper presents a method of calculating the full load engine characteristics based on the Leiderman–Khlystov relation. Because the values of the coefficients of the discussed function available in literature were ... The paper presents a method of calculating the full load engine characteristics based on the Leiderman–Khlystov relation. Because the values of the coefficients of the discussed function available in literature were determined for obsolete engine designs, an attempt was made to update them. To this end, a chassis dynamometer was used where a database of results had been built for a variety of vehicles. Following the data collection, the coefficients for variety of fueling system(six groups: fuel injected gasoline and turbocharged gasoline, spark ignition LPG Ⅰ–Ⅱ and Ⅳ generation, naturally aspirated diesel and turbocharged diesel) were determined. The identification of the coefficients was carried out in Matlab-Simulink indicating the applicability of the said function for most of the engines, yet the recent popularity of turbocharged gasoline engines requires an additional analysis of the possibility of use of a different functional description. The full load engine characteristics is a basis for the vehicle performance characteristics and, further, for modeling of traffic in a variety of aspects of the vehicle operation. 展开更多
关键词 passenger car Combustion engines Full load engine characteristics Numerical identification
下载PDF
Research of DP600 high strength steel wheels
19
作者 QI Feng and XUE Feng Shanghai baosteel wheels Co.,Ltd.,Shanghai 201941,China 《Baosteel Technical Research》 CAS 2010年第S1期54-,共1页
Steel has been used as a traditional wheel materials for a long time.Before 1980' s,over 90% wheels were made of steels.Then,the yield strength of wheel steels increased gradually from 240 -350 MPa to 600 MPa or h... Steel has been used as a traditional wheel materials for a long time.Before 1980' s,over 90% wheels were made of steels.Then,the yield strength of wheel steels increased gradually from 240 -350 MPa to 600 MPa or higher.The advanced high strength steels become the main wheel materials.Since 1990's,DP600 has been broadly applied in steel wheels oversea.However,there was little research of application of high strength steel wheels(especially wheel disc) in domestic wheel industrial.In presence, DP600 steel wheel is only developed in FAWSH by using imported CKD.Other domestic steel wheel manufacturers did little work on high strength DP600 wheel discs.Baosteel wheels Co.Ltd.is the first domestic company producing DP600 steel discs and has become the leading company in production of high strength wheel.Because of the high strength of DP600,its formability,springback,and wrinkle have become the keys of the successful application of DP600 steel.In this paper,the metallurgical and mechanical properties are firstly introduced and formation problems of DP600 are described compared to traditional steels.Secondly,FLD analysis has been done.Wrinkle and more springback are recognized.To solve these problems,an optimized solution is designed and the good result is obtained.The test has shown that the fatigue property of steel wheel discs made by DP600 have been greatly improved. 展开更多
关键词 passenger car steel wheels high strengthen steel dual phase steel FORMING process DIES FATIGUE
下载PDF
Side Structure Sensitivity to Passenger Car Crashworthiness During Pole Side Impact 被引量:1
20
作者 董光 王大志 +1 位作者 张金换 黄世霖 《Tsinghua Science and Technology》 SCIE EI CAS 2007年第3期290-295,共6页
Side impact accidents of passenger cars with fixed poles may result in severe injuries to the vehicle occupants. In this paper, side structure intrusion was considered as the criterion for passenger cars crashworthine... Side impact accidents of passenger cars with fixed poles may result in severe injuries to the vehicle occupants. In this paper, side structure intrusion was considered as the criterion for passenger cars crashworthiness during side impact with a pole. The relationship between side intrusions and the side structure stiffness was analyzed. The acceleration of the unstruck side vehicle body was selected as the criterion for studying the influence of different side structure components on the side structure stiffness during passenger car pole side impacts. The behavior was analyzed using finite element simulations. The results show that the rocker and the lower part of the B-pillar are the key parts of the side structures in determining the passenger car side stiffness. Passenger car pole side impact crashworthiness is, therefore, most sensitive to these two components. 展开更多
关键词 passenger car pole side impact CRASHWORTHINESS finite element simulation
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部