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Technical Paper

Research on Real-time Obstacle Avoidance by Deceleration and Lane-changing Trajectory Planning and Tracking Strategy Based on Dual Algorithm Control

2021-10-11
2021-01-1262
Aiming at the problem of poor robustness after the combination of lateral kinematics control and lateral dynamics control when an autonomous vehicle decelerates and changes lanes at a certain distance. This paper proposes a trajectory determination and tracking control method based on a PI-MPC dual algorithm controller. In order to describe the longitudinal deceleration that satisfies the lateral acceleration limit during a certain distance of lane change, firstly, a fifth-order polynomial and a uniform deceleration motion formula are established to express the lateral and longitudinal displacements, and a model prediction (MPC) controller is used to output the front wheel rotation angle. Through the dynamic formula and the speed proportional integral (PI) controller to control and adjust the brake pressure.
Technical Paper

Reconstruction of an auto-rickshaw frontal crash using FE simulation with validation using captured crash video from India

2021-10-01
2021-28-0257
The three wheeled “Auto-Rickshaws” [Auto] plays a significant role in road transportation, especially in India. The crash safety and reconstruction studies have been widely used in four wheelers, whereas the availability of such data for Auto was found to be limited. In recent times, accident data processing from available videos is being utilised to observe the crash scenario, from which the crash parameters can be given as inputs to the crash analysis. This paper focusses on process the real-world accident data and study crash characteristics. With limitation in availability of detailed injuries post-crash, the study was restricted to reconstruction of crash kinematics and estimations of indicative injuries to driver. The source of video data is videos of crash available in public domains like YouTube. PYTHON video processing tool has been used to process the set of real-world accident video data.
Technical Paper

Design and Analysis of Hybrid Monocoque chassis for an FSAE car

2021-10-01
2021-28-0251
The automotive industry is increasingly focused on developing the vehicle chassis structure with passenger safety being the priority followed by improving the overall dynamic efficiency. Competition vehicles built using isotropic materials can be made safe but are heavier as compared to anisotropic materials like composite sandwich structures. This project is focused on designing a Hybrid Monocoque Chassis by incorporating both traditional and alternative materials to demonstrate that the hybrid chassis will be lighter, stiffer, and meet all of the safety and rule requirements. It is imperative to calculate the strength and stiffness of the composite sandwich panels before qualifying the monocoque for Formula SAE competition. The surface model of chassis is generated and shaped around the driver and then connected with the rear subframe while conforming to the torsional, hardpoint and bending stiffness benchmarks.
Technical Paper

DESIGN AND FABRICATION OF VEHICLE ROLLOVER PREVENTION SYSTEM BY COUNTER STEERING MECHANISM IN AUTOMOBILE

2021-10-01
2021-28-0155
Rollover prevention plays an important role in stability of the vehicle. About 35% percentage of accidents are caused due to rollover .Therefore this brings a need to prevent accidents caused by roll-over of vehicles. So this system prevents the eventual roll-over of the vehicle by a method of counter steering which turns or moves the vehicle in the direction where an eventual roll-over is occurring by applying a physical principle of neutral equilibrium which is displacing an object while not changing the position of its center of gravity .Counter steering brings the vehicle into a neutral equilibrium state thus avoiding the rollover. The rollover is sensed by the MPU-6050 accelerometer cum gyroscope sensor which detects the roll angle, roll acceleration of the vehicle. The programming is done for the ATMEGA controller using Arduino IDE software for continuous monitoring of roll angle and roll acceleration of the vehicle.
Standard

Truck Deformation Classification

2021-09-27
WIP
J1301
The scope and purpose of this SAE Recommended Practice is to provide a classification system for deformation sustained by trucks involved in collisions on the highway. Application of the document is limited to medium trucks, heavy trucks, and articulated combinations. The TDC classifies collision contact deformation, as opposed to induced deformation, so that the deformation is segregated into rather narrow limits or categories. Studies of collision deformation can then be performed on one or many data banks with assurance that data under study are of essentially the same type. Many of the features of the SAE J224 MAR80 have been retained in this document, although the characters within specific columns vary. Each document must therefore be applied to the appropriate vehicle type. It is also important to note that the Truck Deformation Classification (TDC) does not identify specific vehicle configurations and body types.
Standard

Collision Deformation Classification

2021-09-27
WIP
J224
The purpose and scope of this SAE Recommended Practice is to provide a basis for classification of the extent of vehicle deformation caused by vehicle accidents on the highway. It is necessary to classify collision contact deformation (as opposed to induced deformation) so that the accident deformation may be segregated into rather narrow limits. Studies of collision deformation can then be performed on one or many data banks with assurance that the data under study are of essentially the same type. The seven-character code is also an expression useful to persons engaged in automobile safety, to describe appropriately a field-damaged vehicle with conciseness in their oral and written communications. Although this classification system was established primarily for use by professional teams investigating accidents in depth, other groups may also find it useful. The classification system consists of seven characters, three numeric, and four alphameric, arranged in a specific order.
Technical Paper

Mitigation of Engine Sub-System Noise in Two Wheeler Using Crank Angle Domain Analysis

2021-09-22
2021-26-0306
One of the main objective of manufacturer is to achieve high productivity with low cost while increasing the customer satisfaction. With increased competition in the automotive sector the product quality is defined not only from fuel economy and durability perspective but also Noise, Vibration and Harshness (NVH), which plays a vital role in attracting the customers. In two wheelers, engine is dominant noise source and its quality improvement is utmost priority. Now a days, several signal processing and sensing techniques are developed for noise source identification of an engine but precise source identification can be achieved only by advanced analysis technique. This paper focuses on a procedure for noise source identification from engine sub-system viz. valve operation and its generation mechanism using crank angle domain analysis in two wheeler engine. Baseline noise measurements were carried out for critical frequency identification.
Technical Paper

Rear Seat Child Occupant Safety in Rear-Impact Collisions

2021-09-22
2021-26-0010
Child safety in the back seat during a rear-impact chiefly depends on how well the survival space is maintained at their location. Collapsing front seatback pose a foreseeable hazard as it intrudes into the survival space of the child on the backseat. Furthermore, the condition gets worse in the presence of a structural intrusion from the rear that tends to push the occupant further closer to the backward collapsing seatbacks. This paper reports two real-world rear impact collisions resulting severe to fatal injuries to the child occupant seating behind the driver. Each collision shows the dangers of seatback collapse into the survival space of the child. Furthermore, the paper demonstrates safety through design concept by employing seats with strong seatback design resisting collapse into the survival space of the child.
Technical Paper

Engineering Challenges in Alloy Wheel Rim for Safety Simulations

2021-09-22
2021-26-0362
Aluminum alloy wheels are being widely used in the automotive industry since the last decade due to its superior styling and performance. Alloy wheel rim is one of the critical components and plays an important role in a frontal crash scenario. The wheel rim failure prediction in safety simulation is essential to ensure robust safety performance. Determining failure characteristics of an alloy wheel poses many difficulties considering its brittle nature, porosity and inhomogeneity in material properties across different regions of wheel rim due to mold design, cooling rate and other process parameters of the low-pressure die casting process. This paper describes the modelling and simulation methodology developed to predict accurate wheel behavior. The methodology addresses two distinct areas of challenges such as alloy wheel rim failure prediction and associated tire blow out.
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