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Multi body dynamic simulation of tyre traction trailer

International Centre For Automotive Tech.-Gopal Singh Rathore
  • Technical Paper
  • 2019-28-2430
To be published on 2019-11-21 by SAE International in United States
Tyre Traction Trailer is a device designed to find the Peak Brake co-efficient of C2 and C3 tyre as per ECE R117. The trailer is towed by the truck and is braked suddenly to evaluate braking co-efficient of specimen tyre. It is a single wheel trailer equipped with load cell to capture tire loads (Normal and longitudinal)while braking. Traction Trailer is modelled in MSC Adams and rigid body simulation is carried out for static stability of the system. Dynamic simulations were performed to understand locking of wheels during braking. Body frame was further modelled as flex body to perform structural analysis of the frame. The paper contains stress and deformation plots of trailer Structure under various loading conditions, change in Centre of gravity, weight transfer and forces on springs during braking and cornering, plots of tractive and normal load on tyre during braking.
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Development of PCX HEV

  • Technical Paper
  • 2019-28-2454
To be published on 2019-11-21 by SAE International in United States
In the fourth-generation model of the 2018 PCX, the basic structure of frame was reviewed to make it lighter and rigid. Weight reduction was also adapted to its wheels. These enhancements contributed to its increased dynamic performances. The engine performances were enhanced as well, and all these features made it possible to provide a high-quality riding with composure of rider’s mind. In addition, we developed hybrid model PCX HYBRID that uses an ACG starter directly connected to a crankshaft as a drive assist system and realized pleasurable ride feeling with a more direct drive response.
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Model Based Design of Chassis-Frame with MATLAB

VE Commercial Vehicles Ltd.-Rishabh Singh parihar, Gaurav Sharma, Nitinkumar prabhakar patil, Yogendra Aniya
  • Technical Paper
  • 2019-28-2429
To be published on 2019-11-21 by SAE International in United States
In the current commercial vehicles market, ride-comfort and handling are crucial parameters for the customer and end user. There are various aspects which determine the vehicle behaviour. One of aspects is the structural rigidity of the vehicle, which has its own effect on vehicle dynamics. To meet the required stiffness of the main structural component of the vehicle i.e. chassis frame, FEA analysis has to be done in current methodology. The number of iterations have to be done to build an appropriate model with low weight, which can meet the design requirements. At first, conceptual design mock-up unit is to be developed then FEA (CAE) analysis to be done on it. If any design criteria are not met, then this cycle repeats again until it fulfils the required stiffness. Today, the direct stiffness procedure is the basic principle of almost every FEA software package. In this paper, computer code based on MATLAB software is provided and presented for the analysis of the chassis frame using the direct stiffness method. The code, models a structure of…
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A Self-Intelligent Traffic Light Control System based on Traffic Environment using Machine Learning

Maharaja Agrasen Inst. Of Technology-Shubham Upadhyaya
Maharaja Agrasen institute of technology-Ananya Bansal
  • Technical Paper
  • 2019-28-2459
To be published on 2019-11-21 by SAE International in United States
In this paper, we will detect and track vehicles on a video stream and count those going through a defined line and to ultimately give an idea of what the real-time on street situation is across the road network. Our major objective is to optimize the delay in transit of vehicles in odd hours of the day. It uses YOLO object detection technique to detect objects on each of the video frames And SORT (Simple Online and Realtime Tracking algorithm) to track those objects over different frames. Once the objects are detected and tracked over different frames a simple mathematical calculation is applied to count the intersections between the vehicles previous and current frame positions with a defined line. At present, the traffic control systems in India, lack intelligence and act as an open-loop control system, with no feedback or sensing network. Present technologies use Inductive loops and sensors to detect the number of vehicles passing by. This is a very inefficient and expensive way to make traffic lights adaptive. Using a simple CCTV camera…
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Appraisal of Tribo Meter Study on 20MnCr5 Alloy Steel under Case Hardened and Shot Peened Condition

Shanthi Gears Limited-Vignesh Nataraj
Sri Krishna College of Engg. and Tech.-Soundararajan Ranganathan, Janarthanan Prakash, Dinu Mathew
  • Technical Paper
  • 2019-28-0098
To be published on 2019-10-11 by SAE International in United States
This research is limited to study the strength and wear resistance of 20MnCr5 (SAE 5120) alloy steel under monolithic, case hardened and case hardened with shot peening processing condition. Improve the hardness of the material by enhancing the core and surface strength of case hardened with the shot peened sample. The main objective of this proposed work is to conduct the tribometer test by varying the load of 10, 20, 30 and 40N and sliding speed of 193, 386 rpm respectively on wear rate and coefficient of friction be calculated and recorded for this study. Less wear rate and nominal coefficient of friction were observed for case hardened with the shot peened sample. Load increases wear rate increases and the coefficient of friction decreases when sliding distance increases wear rate decreases and the coefficient of friction increases for all the tested samples due to oxide layer formation. After reaching certain load and sliding speed the curve goes linear because of more contact between pin and disc, so that mechanical amalgamation layer will be formed. On…
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Modeling Tracked Vehicle to Determine Undercarriage Performance

John Deere India Pvt. Ltd.-Goutam Shriyan, Vikas Vithal Kshirsagar
  • Technical Paper
  • 2019-28-0116
To be published on 2019-10-11 by SAE International in United States
In tracked vehicles, the undercarriage frame components such as track shoes, sprocket, idler, rollers and their configuration plays an important role while transferring the loads from the ground to the main frame. To understand the loads coming on the upper frame and understand the power consumed to drive the vehicle, it is important to model the undercarriage components. This paper presents the methodology for modeling track systems dynamics and its energy analysis. A 3D model of tracked vehicle was developed using commercially available Multi-Body Dynamics tool and validated against test results. The contact parameters between ground and track shoes was determined by varying their values within a defined range based on empirical data available. The undercarriage performance was measured by determining the power required by the hydrostatic drivetrain motor. The contact friction between the sprocket and the track shoe is important to properly transfer the motion from the sprocket to track chain. This value is determined by measuring the power required in the test and estimating the friction value accordingly in the model. This model…
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Design Considerations and Analysis of Electric Microcar for Cities

VNR VJIET-Amjad Shaik, Raju Tappa, Prashanth Kannan, Pavan Bharadwaja Bhaskar, Srinivasa Rao Talluri
  • Technical Paper
  • 2019-28-0161
To be published on 2019-10-11 by SAE International in United States
Increasing concerns about environmental issues, such as global warming and pollutant emissions have made increase in energy efficiency and emission reduction a primary concern for automobiles. In addition, the compounding effects of adding personal vehicles, increasing density of road traffic and intensifying parking difficulties are indirectly promoting proliferation of small-size vehicles in large cities. Hence, there is a need to develop a microcar with zero emission. Thus, electric microcar is probably the simplest, green and energy efficient vehicle that relatively affordable and easily maneuverable in cities. However, a careful analysis is required in order to properly evaluate the propulsion system component sizing, vehicle dimension, performance and weight. This paper mainly focuses on design options and modeling of electric microcar using hub motors followed by analysis. A two seater electric microcar analytical model using MATLAB has been carried out for sizing of powertrain elements. CAD modeling of tubular frame chassis using solid works followed by analysis using ANSYS is also carried out. A successful deployment of an electric microcar is need of the hour to meet…
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new

Flammability of Polymeric Interior Materials - Horizontal Test Method

Textile and Flexible Plastics Committee
  • Ground Vehicle Standard
  • J369_201908
  • Current
Published 2019-08-08 by SAE International in United States
This SAE Standard pertains to automotive vehicles and off-road, self-propelled work machines used in construction, general purpose industrial, agriculture, forestry, and specialized mining machinery. This standard does not address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this document to establish safety and health practices and determine the applicability of regulatory limitations prior to use. Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed when conducting this test.
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Simulation of Ice Particle Breakup and Ingestion into the Honeywell Uncertified Research Engine (HURE)

NASA Glenn Research Center-Ashlie Flegel, Michael King
Vantage Partners Limited-David L. Rigby, William Wright
Published 2019-06-10 by SAE International in United States
Numerical solutions have been generated which simulate flow inside an aircraft engine flying at altitude through an ice crystal cloud. The geometry used for this study is the Honeywell Uncertified Research Engine (HURE) which was recently tested in the NASA Propulsion Systems Laboratory (PSL) in January 2018. The simulations were carried out at predicted operating points with a potential risk of ice accretion. The extent of the simulation is from upstream of the engine inlet to downstream past the strut in the core and bypass. The flow solution is produced using GlennHT, a NASA in-house code. A mixing plane approximation is used upstream and downstream of the fan. The use of the mixing plane allows for steady state solutions in the relative frame. The flow solution is then passed on to LEWICE3D for particle trajectory, impact and breakup prediction. The LEWICE3D code also uses a mixing plane approximation at the boundaries upstream and downstream of the fan. A distribution of particle sizes is introduced upstream, based on the distribution measured during the test. Predicted collection…
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Structure-Borne Prediction on a Tire-Suspension Assembly Using Experimental Invariant Spindle Forces

Siemens Industry Software NV-Jesús Ortega Almirón, Fabio Bianciardi, Patrick Corbeels
Published 2019-06-05 by SAE International in United States
Road induced noise is getting more and more significant in context of the electrification of the powertrain. The automotive industry is seeking for technologies to predict the contribution of vehicle components upfront, early in the development process. Classical Transfer Path Analysis (TPA) is a well-established technique that successfully identifies the transmission paths of noise and vibration from different excitation sources to the target responses. But it has a drawback: it requires the physical availability of the full vehicle. To achieve shorter development cycles, to avoid costly time-consuming design iterations and due to the limited availability of prototypes, engineers derived a method that addresses these requirements. Component-based TPA is a relatively new structure borne substructuring approach that allows to characterize the source excitation by a set of equivalent loads (blocked forces) independently from the receiver structure and to predict its behavior when coupled to different receivers. Frequency Based Substructuring, FBS, is applied in order to obtain the coupled assembly. However, there are a number of challenges affecting its applicability, such as the proper modelling of the…
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