Vehicle Research and Development Establishment

Ahmadnagar, India

Vehicle Research and Development Establishment

Ahmadnagar, India

Time filter

Source Type

Sarma P.K.,Gandhi Institute of Technology and Management | Krishna D.R.,Vehicle Research and Development Establishment | Ramanarayanan C.P.,Vehicle Research and Development Establishment | Srinivas V.,Gandhi Institute of Technology and Management
International Journal of Heat and Technology | Year: 2012

The present analysis is essentially a theoretical approach to establish the performance characteristics of engine oil cross flow heat exchanger with cold air as the unmixed coolant at different altitudes of the flight. The present configuration of the heat exchanger is a specific case being used by Vehicle Research Development Establishment (VRDE). The study takes into account die thermo- physical property variation of engine oil with respect to temperature in the oil ducts. The predictions from theoretical considerations are compared with the conventional empirical equations available in heat transfer handbooks. It is observed that the theoretical results related to effectiveness of heat exchanger deviate markedly from results of computational procedures found in the heat transfer data books. Further, the present analytical approach is rendered into a dimensionless correlation .The outlet temperature estimates from the analytical study for the engine oil and cold air at different altitudes agree very satisfactorily with the corresponding values from the proposed correlation equation.


More R.R.,Vehicle Research and Development Establishment | Adhav P.,Sardar Vallabhbhai National Institute of Technology, Surat | Senthilkumar K.,Vehicle Research and Development Establishment | Trikande M.W.,Vehicle Research and Development Establishment
Applied Mechanics and Materials | Year: 2014

Amphibious design of combat vehicle has become a challenging task in the context of increase in Gross Vehicle weight(GVW) of present generation combat vehicles due to demand for increased armour protection and higher capacity engine and transmission, incorporation of multiple weapon systems, increased ammunition storage and larger addition of electrical and electronic items. Development of combat vehicles is complex and very expensive, and normally limited with less number of prototypes. The scale modeling technique and experimental model testing in conjunction with CFD analysis offer a viable solution to accomplish the amphibian design of a combat vehicle with adequate confidence before manufacturing the actual prototype. In the present work, an approach involving experimental towing test of scaled vehicle model and CFD simulation has been used to carry out the amphibious design of an 8×8, wheeled, combat vehicle with a GVW of 22 ton. In this work, a 1/5th scaled model of the vehicle was manufactured and tested in a towing tank at different test speeds for drag and stability analysis. CFD analysis was carried out on the full scale model to gain adequate details about the dynamics of vehicle in the water in addition to drag estimation. Good correlation has been found in drag values and the flow patterns obtained from towing tank tests and CFD simulations. © (2014) Trans Tech Publications, Switzerland.


Anand Raj R.,Vellore Institute of Technology | Shrivastava S.,Vehicle Research and Development Establishment | Trikande M.W.,Vehicle Research and Development Establishment
2015 International Conference on Industrial Instrumentation and Control, ICIC 2015 | Year: 2015

Developing vehicles with semi-active suspension by replacing passive system has been a great interest in the field of automotive industry. Maintaining stability and performance in spite of uncertainties in working environment is a prior concern for designing successful control system. Skyhook control policy is adapted for giving good ride performance. This paper introduces an optimum method for controlling vibration of semi-active suspension system in a quarter car system. Fuzzy logic controller developed on the basis of skyhook algorithm is compared with on-off and continuous skyhook control in time domain. The results show that Fuzzy logic gives better vibration control and along with PID velocity control gives better ride comfort than its counterparts. © 2015 IEEE.


Ambekar A.,Indian Institute of Technology Bombay | Bhangale R.,Indian Institute of Technology Bombay | Dukale A.,Indian Institute of Technology Bombay | Gandhi R.,Indian Institute of Technology Bombay | And 3 more authors.
49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference | Year: 2013

Experimental investigation of spray combustion of the monopropellant nitromethane (NM) assisted by a hot surface is presented. Spray combustion of NM was studied in a constant volume combustion chamber fitted with glow plugs within the chamber pressure range of 1 to 5 bar. The sprays were produced by injecting approximately 0.1 ml of the propellant through a commercial gasoline injector. Ignition was achieved by using two glow plugs placed in a horizontally opposed manner at a distance of 70 mm from the nozzle tip within the chamber. The pressure rise within the chamber was used to elucidate the ignition and combustion processes. The ignition delays were found to be in the order of milliseconds, with high heat release rates accompanying the combustion phenomena. The maximum differential pressures reached during combustion were found to increase with chamber pressure up to 3 bar, and decrease thereafter. The rate of pressure rise achieved after combustion were also found to be dependent on the initial chamber pressures. FTIR spectrometry of the combustion products yielded further insight into the reactions.


Ambekar A.,Indian Institute of Technology Bombay | Mallick L.,Indian Institute of Technology Bombay | Gandhi R.,Indian Institute of Technology Bombay | Chowdhury A.,Indian Institute of Technology Bombay | And 2 more authors.
49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference | Year: 2013

An experimental investigation was conducted to characterize the strand combustion of pure isopropyl nitrate (IPN) blended with a known de-sensitizer dibutyl sebacate (DBS). The blend was prepared with 75% IPN mixed with 25% DBS by weight so as to mimic the composition of Otto fuel II. Quartz tubes of 3, 5, 7.5, and 9 mm in diameters were utilized to create the strands of various diameters. The experiments were conducted in a quiescent atmosphere of air and the ambient pressure was varied from 5 to 40 bar in steps of 5 bar. Ignition of the strands was achieved by using a heated 60 μm Nichrome wire dipped in the liquid. The dependence of the linear burning rate of IPN-DBS blends on ambient pressure as well as the strand diameter was elucidated. The temperatures in the flame zone were measured with K-type thermocouples of 250 urn diameter. The ambient pressure variation was investigated for a strand diameter of 5 μm while, the tube diameter variation was studied at 5 and 40 bar pressure. The linear burning rate of IPN-DBS blends in 5 mm diameter tube was found to rise with pressure. The gas phase temperature above the tip of the tube was measured using 250 μm K-type thermocouple. The burning rate of IPN-DBS blends was found to be lower than that of pure IPN as well as Otto fuel II.


Ambekar A.,Indian Institute of Technology Bombay | Mallick L.,Indian Institute of Technology Bombay | Gandhi R.,Indian Institute of Technology Bombay | Chowdhury A.,Indian Institute of Technology Bombay | And 2 more authors.
49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference | Year: 2013

An experimental investigation was conducted to characterize the combustion of a pure monopropellant isopropyl nitrate (IPN). Quartz tubes of 3, 5, 7.5, and 9 mm inner diameter were utilized to create the strands of varying dimensions. The experiments were conducted in a quiescent atmosphere of air and the ambient pressure was varied from atmospheric pressure to 40 bar in steps of 5 bar. Ignition of the IPN strands was achieved by using a heated 60 μm Nichrome wire dipped in the liquid. The dependence of the linear burning rate of pure IPN on ambient pressure as well as the strand diameter was elucidated. The temperatures in the flame zone and liquid phase were measured by K-type thermocouples of 250 and 75 μm diameters respectively. The ambient pressure variation was investigated for strand diameter of 5 mm, while the tube diameter variation was studied at 1, 10, 20 and 40 bar pressure. The linear burning rate of pure IPN strands of 5 mm diameter was found to exhibit staged behavior where a steep rise in burning rate with pressure was observed after an initial decreasing trend. The linear burning rate was found to reduce with increasing tube diameter. The effect of IPN monopropellant flame was prominently observed only for pressures higher than 10 bar.


Trikande M.W.,Vehicle Research and Development Establishment | Jagirdar V.V.,Vehicle Research and Development Establishment | Sujithkumar M.,Vehicle Research and Development Establishment
Applied Mechanics and Materials | Year: 2014

Comparative performance of vehicle suspension system using passive, and semi-active control (onoff and continuous) has been carried out for a multi-axle vehicle under the source of road disturbance. Modelling and prediction for stochastic inputs from random road surface profiles has been carried out. The road surface is considered as a stationary stochastic process in time domain assuming constant vehicle speed. The road surface elevations as a function of time have been generated using IFFT. Semi active suspension gives better ride comfort with consumption of fraction of power required for active suspension. A mathematical model has been developed and control algorithm has been verified with the purpose/objective of reducing the unwanted sprung mass motions such as heave, pitch and roll. However, the cost and complexity of the system increases with implementation of semi-active control, especially in military domain. In addition to fully passive and fully semi-active a comparison has been made with partial semi-active control for a multi-axle vehicle to obviate the constraints. The time domain response of the suspension system using various control logics are obtained and compared. Simulations for different class of roads as defined in ISO: 8608 have been run and the ride comfort is evaluated and compared in terms of rms acceleration at CG in vertical direction (Z), which is the major contributor for ORV (Overall Ride Value) Measurement. © (2014) Trans Tech Publications, Switzerland.


Singh M.,Vehicle Research and Development Establishment | Singh M.,College of Engineering, Pune | Jaybhaye M.D.,Vehicle Research and Development Establishment | Jaybhaye M.D.,College of Engineering, Pune | And 2 more authors.
Defence Science Journal | Year: 2014

In this paper authors have discussed risk quantification methods and evaluation of risks and decision parameter to be used for deciding on ranking of the critical items, for prioritization of condition monitoring based risk and reliability centered maintenance (CBRRCM). As time passes any equipment or any product degrades into lower effectiveness and the rate of failure or malfunctioning increases, thereby lowering the reliability. Thus with the passage of time or a number of active tests or periods of work, the reliability of the product or the system, may fall down to a low value known as a threshold value, below which the reliability should not be allowed to dip. Hence, it is necessary to fix up the normal basis for determining the appropriate points in the product life cycle where predictive preventive maintenance may be applied in the programme so that the reliability (the probability of successful functioning) can be enhanced, preferably to its original value, by reducing the failure rate and increasing the mean time between failure. It is very important for defence application where reliability is a prime work. An attempt is made to develop mathematical model for risk assessment and ranking them. Based on likeliness coefficient 1ßand risk coefficient 2ß ranking of the sub-systems can be modelled and used for CBRRCM. © 2014, DESIDOC.


Ambekar A.,Indian Institute of Technology Bombay | Chowdhury A.,Indian Institute of Technology Bombay | Challa S.,Vehicle Research and Development Establishment | Radhakrishna D.,Vehicle Research and Development Establishment
Fuel | Year: 2014

An experimental investigation was conducted to characterize the monopropellant droplet combustion of pure and blended isopropyl nitrate (IPN), suspended on quartz fibers in a quiescent atmosphere. The blends were prepared by mixing varying percentages by weight of IPN with less viscous n-heptane, as well as highly viscous desensitizer dibutyl sebacate (DBS). Ignition was achieved by using a heated 60 μm Nichrome wire. The dependence of the burning rate constant of pure IPN on initial droplet diameter was investigated in the droplet size range of 0.79-1.97 mm. The blended IPN studies were carried out with initial droplet diameters of 2 and 1.5 mm for IPN-n-heptane and IPN-DBS blends respectively, to characterize the effect of gravimetric composition. The experiments revealed a strong dependence of IPN burning rate on droplet size. The IPN-DBS blends were characterized by severe micro-explosions, further atomizing the droplet, governed by the preferential evaporation of IPN over DBS. However, micro-explosions were conspicuously absent in case of IPN-n-heptane blends due to simultaneous gasification of both components. © 2013 Elsevier Ltd. All rights reserved.


Ambekar A.,Indian Institute of Technology Bombay | Bhangale R.,Indian Institute of Technology Bombay | Dukale A.,Indian Institute of Technology Bombay | Chowdhury A.,Indian Institute of Technology Bombay | And 2 more authors.
Proceedings of the 9th Asia-Pacific Conference on Combustion, ASPACC 2013 | Year: 2013

Experimental investigation of spray combustion of the monopropellant isopropyl nitrate (IPN), and IPN blends prepared with a traditional desensitizer di-butyl sebacate (DBS) are presented. The blends were prepared by mixing IPN with highly viscous DBS in percentages of 70, 80, and 90% by weight of IPN. Spray combustion of IPN-DBS mixtures was studied in a constant volume combustion chamber fitted with glow plugs within the chamber pressure range of 1 to 5 bar. The sprays were produced by injecting approximately 0.2 ml of the propellants through an industrial oil burner nozzle. Ignition was achieved by using two glow plugs placed in a horizontally opposed manner at a distance of 50 mm from the nozzle tip within the chamber. The pressure rise within the chamber was used to elucidate the ignition and combustion process. The ignition delays were found to be in the order of milliseconds, with high heat release rates accompanying the combustion phenomena. The maximum pressures reached during combustion were found to be similar for pure IPN as well as 80% and 70% IPN blends, and were found to be lower for 90% IPN blends. The pressure rise achieved after combustion were also found to be dependent on the initial chamber pressures.

Loading Vehicle Research and Development Establishment collaborators
Loading Vehicle Research and Development Establishment collaborators