Gautam A.,Indian Institute of Technology Kanpur |
Gautam A.,Indian Ministry of Railways |
Agarwal A.K.,Indian Institute of Technology Kanpur
International Journal of Engine Research | Year: 2013
A large-bore, four-stroke, medium-speed, compression-ignition railway traction locomotive engine was fueled with cottonseed methyl ester (Biodiesel). The cottonseed methyl ester was stored for 6 months under ordinary storage conditions, and various fuel properties of this seasoned cottonseed methyl ester were evaluated. Various blends of cottonseed methyl ester (B10, B20, B50 and cottonseed methyl ester) were evaluated for engine performance, emissions and combustion characteristics of the locomotive engine compared to baseline diesel. Correlation of the fuel-injection performance parameters with the physical properties of biodiesel has been carried out. The engine was able to operate on cottonseed methyl ester without noticeable power loss. With cottonseed methyl ester, the thermal efficiency decreased marginally by 0.7% and the brake-specific energy consumption increased by 0.1 MJ/kWh at the rated power. Due to the lower calorific value of biodiesel, brake specific fuel consumption (BSFC) increased by 13.4% at eighth engine notch, nitrogen oxide emissions increased by 8% and particulate matter emissions decreased by 32% vis-a-vis mineral diesel. Nitrogen oxide emissions were found to be a function of injection timings, global oxygen/carbon ratios, time of the maximum mean in-cylinder temperatures and apparent heat release. Particulate matter emissions were found to depend on the air-fuel mixture's oxygen/carbon ratio, fuel bound oxygen and fuel-injection pressure. The experiments were carried out to evaluate the in-cylinder pressure, heatrelease rate, cumulative heat release, fuel-injection pressure, needle lift and fuel-injection velocities. Increased fuel-injection pressures (1000 bar compared to 900 bar for mineral diesel), advanced fuel-injection timings, shorter combustion duration, advanced in-cylinder pressures and higher heat-release rates were observed for biodiesel and blends. The findings of the present study have provided further insights into the combustion of biodiesel in locomotive engines. © 2012 IMechE.
Liu Y.,Southwest Jiaotong University |
Zhao G.-T.,Indian Ministry of Railways
Advanced Materials Research | Year: 2013
In view of ballasted-CRTS II ballastless track transition section on the bridge ofBeijing-Shanghai high-speed railway, the influence of track random irregularity and pier foundationsettlement difference on acceleration and stability index of locomotive body are discussed by thefinite element method. And then, by using the index of rail deflection gradient to describe the law ofdynamic interaction, rail-wheel dynamic response, attenuation distance of locomotive bodyacceleration and change of sleeper pressure caused by under-rail stiffness difference are analyzed.Finally, the recommended value of reasonable length of transition section is put forwarded. © (2013) Trans Tech Publications, Switzerland.
An G.-D.,Indian Ministry of Railways
Tiedao Xuebao/Journal of the China Railway Society | Year: 2010
The technique of precise engineering surveying for high-speed railways is one of the key techniques to construct high-speed railways successfully. According to the requirements for track smoothness of high-speed railways, this paper expounds the surveying principle for integration of the surveying control network in the three phases of design, construction and operation through studies on theories and tests, explores systematically the technical standards for the coordinate system of high-speed railway plane and elevation control surveying, the height datum, the principle for network distribution, surveying methods and precision as well as the confirmation regulations. The recent practical construction and operation of high-speed railways verify the scientific and advanced nature, adaptability and reliability of the technical standards for precise engineering surveying of high-speed railways in our country.
Das P.P.,Indian Ministry of Railways |
Mahato S.N.,National Institute of Technology Durgapur
2016 2nd International Conference on Control, Instrumentation, Energy and Communication, CIEC 2016 | Year: 2016
Artificial Bee Colony Algorithm (ABC) has been used to optimize the design of a six-phase induction motor (SPIM). Multi-objective function has been considered for optimization. Comparison of the optimum design using Artificial Bee Colony Algorithm with that of traditional design and Genetic Algorithm (GA) based optimum design has been presented, which shows that improved design can be achieved by Artificial Bee Colony technique of optimization. Comparison of the results obtained has been done to find the fittest method of optimization for the said purpose. Performances of the induction motor have been evaluated for each design effectively. © 2016 IEEE.
Singh B.,Indian Institute of Technology Delhi |
Niwas R.,Indian Ministry of Railways
IEEE Transactions on Industry Applications | Year: 2016
This paper presents power quality improvement of a permanent-magnet-synchronous-generator-based diesel generator (DG) set feeding three-phase loads using a static compensator (STATCOM). A three-leg voltage-source converter (VSC) with a capacitor on the dc link is used as a STATCOM. The reference source currents for the system are estimated using an Adaline-based control algorithm. A pulsewidth modulation current controller is used for generation of gating pulses of insulated-gate bipolar transistors of the three-leg VSC of the STATCOM. The STATCOM is able to provide voltage control, harmonics elimination, power factor improvement, load balancing, and load compensation. The performance of the system is experimentally tested on various types of loads under steady-state and dynamic conditions. A three-phase induction motor with variable-frequency drive is used as a prototype of diesel engine with the speed regulation. Therefore, the DG set is run at constant speed so that the frequency of supply remains constant irrespective of loading condition. © 1972-2012 IEEE.
Ma Y.-Q.,Indian Ministry of Railways
Advanced Materials Research | Year: 2014
A large number of experiments have been carried out in this study to reveal the effect of the steel fiber dosage on the mechanical properties of HPC (high performance concrete). The mechanical property includes compressive strength, elastic modulus and flexural strength. The results indicate that the addition of steel fiber increase the compressive strength, elastic modulus and flexural strength of HPC. When the steel fiber dosage is less than 2%, these mechanical property parameters are increasing gradually with the increase of steel fiber dosage, while these parameters begin to decrease when the steel fiber dosage is more than 2%. With the development of HPC, the application of steel fibers in HPC becomes more and more popular. In the actual construction of steel fiber reinforced HPC, the dosage of steel fiber should be controlled strictly in order to ensure that the steel fibers can perform their best improvement on high performance concrete. © (2014) Trans Tech Publications, Switzerland.
Ma Y.-Q.,Indian Ministry of Railways
Advanced Materials Research | Year: 2014
A great deal of experiments have been carried out in this study to reveal the effect of the water-binder ratio and fly ash content on the workability and strengths of GHPC (green high performance concrete). The workability of GHPC was evaluated by slump and slump flow. The strengths include compressive strength and splitting tensile strength. The results indicate that the increase of water-binder ratio can improve the workability of GHPC, however the strengths of GHPC were decreased with the increase of water-binder ratio. When the fly ash content is lower than 40%, the increase in fly ash content has positive effect on workability of GHPC, while the workability begins to decrease after the fly ash content is more than 40%. The addition of fly ash in GHPC has adverse effect on the strengths, and there is a tendency of decrease in the compressive strength and splitting tensile strength of GHPC with the increase of fly ash content. © (2014) Trans Tech Publications, Switzerland.
Mishra S.,Indian Ministry of Railways
Water and Energy International | Year: 2013
Conventional ac traction power is a Single Wire Earth Return (SWER) System, This places challenge on, containment of the touch potential of the rail. As traction powers increase, return current management which is closely related to the earthing and bonding practice, becomes an important factor to be considered in the economics & safety of traction power supply-under which billions of kilo metres of freight and passenger movement is logged. Further, need of structure and platform earthing is emerging as a major challenge to guarantee safety to the users, with steadily increasing transformation capacity in traction sub-stations. Similarly, dc traction systems pose an entirely different set of challenges to the adjoining non-railway installations. The presentation aims to flag the issues and provide Indian Railways' experience and global practices.
Zhao L.,Beijing Jiaotong University |
Ran Y.,Beijing Jiaotong University |
Mu J.,Indian Ministry of Railways
Zhongguo Tiedao Kexue/China Railway Science | Year: 2010
A transmission-line theory based simulation model of the induced voltage envelope of the cab signal was proposed. The influence law of the compensation capacitor failure on the induced voltage envelope of the cab signal was analyzed, and the comprehensive fault diagnosis method for track circuit based on genetic algorithm was proposed by utilizing the linear mapping relationship between the inductive voltage of the cab signaling and the current of the track circuit signal. In this method, with the compensation capacitor and the ballast resistance chosen as the decision variables, with the minimum difference between the envelop of the real inductive voltage of the cab signal and the envelop of the simulated signal current of the corresponding track circuit as the objective to form the fitness function, by genetic operations such as selection, crossover and mutation, the optimum value of each decision variable under current state was obtained, thus the comprehensive diagnosis of the track circuit was realized. Experiment results show that the GA method, which is firstly introduced into the diagnosis of track circuit, can give correct and comprehensive judgement by means of the actual record data of the cab signaling under the condition of multiple compensation capacitor failure and unstable ballast resistance, make up the shortage of current methods, and provide a new and effective method for track circuit diagnosis.