Informatics Publishing Limited

M. Balaji ¹, S. M. Vignesh ², M. Srinivasagan ³, J. Thiyagarajan ², S. RajeshKumar ²

Affiliations
1 Department of Mechanical Engineering, SRM University, Chennai - 603203,Tamil Nadu, IN
2 Department of Mechatronics Engineering, SRM University, Chennai - 603203, Tamil Nadu, IN
3 Department of Automobile Engineering, SRM University, Chennai - 603203,Tamil Nadu, IN

Abstract

Objectives: This work is an attempt to present commercially used designs and analyze it to compare the impact behavior of each design of bumper beams during head-on collisions Methods/Statistical Analysis: In order to avoid series of destructive test for a new vehicle to be performed the necessity of economical design using finite element is performed in this study. Parameters like materials, shape and thickness are considered for carrying out analysis with the help of Hypermesh 9.0 and LS-DYNA software Findings: The main criterion to be discussed is energy absorbing Behavior of bumper beams during headon collisions. Analysis is carried out upto 20 millisecond. Results for different Designs and for varying thickness are obtained and compared to study the impact Behavior of beams under study. Impact behavior of Bumper beam is analyzed based on energy absorption of the beam and the displacement condition. Maximum nodal displacement is obtained for different thickness and materials and plotted over the period of time Application/Improvements: Experimental setup has to be developed for the testing of the model under crashes and to be analysed at operating condition.

Keywords

Impact, Collisions, FEA, Bumper Beam, Energy Absorption

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R. Rajalakshmi ¹, S. Rajesh Kumar ¹, J. Thiyagarajan ¹, A. Vinothkumar ²

Affiliations
1 Dept. of Mechatronics Engg., SRM University, Tamil Nadu, IN
2 Dept. of Mech. Engg., Rajalakshmi Engg. College, Tamil Nadu, IN

Abstract

This paper details the assessment of human response to vibration through modelling of seated human body using seven degrees of freedom lumped mass model. Continued human exposure to chronic vibrations may subsequently leads to person’s discomfort. To avoid this discomfort, an active suspension with combination of electro-hydraulic, pneumatic or air spring actuator is introduced between sprung mass and the unsprung mass which is controlled by a PID controller. For the simulation, ISO D-class road is given as input for the designed Matlab Simulink model and the results were compared. The simulation result shows that air spring actuators based active suspension can effectively attenuate the vertical vibration acceleration and increase the riding comfort.

Keywords

Human Body, Lumped Mass, Vibration Control, Active Suspension, Hydraulic and Pneumatic Actuator.

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P. Sathishkumar ¹, S. Rajeshkumar ², T. S. Rajalakshmi ², J. Thiyagarajan ², J. Arivarasan ²

Affiliations
1 Dept. of Auto. Engg. Research Institute, Jiangsu University, Zhenjiang, CN
2 Dept. of Mechatronics Engg., SRM Institute of Science and Technology, Kattankulathur, Chennai, IN

Abstract

The main objective of the variable damper controlled vehicle suspension system is to reduce the discomfort identified by passengers which arises from road roughness and to increase the ride handling related with the rolling, pitching and heave movements. This imposes a very fast and accurate variable damper to meet as much control objectives, as possible. The method of the proposed damper is to reduce the vibrations on each corner of vehicle by providing control forces to suspension system while travelling on uneven road. Numerical simulations on a full vehicle suspension model are performed in the Matlab Simulink toolboxes to evaluate the effectiveness of the proposed approach. The obtained results show that the proposed system provides better results than the conventional suspension system.

Keywords

Full Vehicle Model, 7 Degree of Freedom, Semi-Active Suspension, Passive Suspension, Simulation.

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J. Thiyagarajan ¹, P. Sathishkumar ², J. Arivarasan ¹, S. Rajeshkumar ¹, T.S. Rajalakshmi ¹

Affiliations
1 Dept. of Mechatronics Engg., SRM Institute of Science and Technology, Kattankulathur, IN
2 Automotive Engineering Research Institute, Jiangsu University, Zhenjiang, CN

Abstract

Active suspension systems have been used in the recent years as they provide better ride comfort, road handling and safety. The effect of vehicle vibration caused by road roughness is effectively reduced by active suspension system which plays an important role in improving the vehicle performance indices. The application of active suspension system is limited because it consumes high amount of energy. From the point of energy saving, a regenerative active suspension system is designed and its working principle with two modes switched in different conditions was implemented. In this implementation scheme, operating electric circuits are designed based on different working status of the actuator and power source. In the first stage an electromotor mode in which an active suspension system uses a linear electric actuator controlled by constrained PID controller. In the generator mode, under certain circumstances using linear motor as actuators enables to transform mechanical energy of the car vibrations to electrical energy and accumulated to charge the energy-storage capacitor and fed back into the power source when needed.

Keywords

Active Suspension, Quarter Car, Linear Actuator, PID Controller, Electromotor Mode, Generator Mode.

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T. S. Rajalakshmi ¹, S. Rajeshkumar ¹, J. Arivarasan ¹, J. Thiyagarajan ¹, P. Sathishkumar ²

Affiliations
1 Dept. of Mechatronics Engg., SRM Institute of Science and Tech., Kattankulathur, Tamilnadu, IN
2 Automotive Engineering Research Institute, Jiangsu University, Zhenjiang, CN

Abstract

In the chassis assembly shop, there are instances when the rear axle oil was not filled. During the period from January to December, there were ten such instances that were reported. Out of the 10 cases, 6 cases seized after handing over the vehicle to the customer and 4 cases were identified when the vehicles left the assembly process. The reason for the seizing of the trucks was predominantly due to the absence of the oil in the rear axle or in some cases, due to the discrepancy that occurred. This problem can be rectified by introducing the concept of interlocking, wherein the conveyor stops from proceeding to the next stage in case the rear axle oil is not filled. To prevent any further chances of error, a system was suggested where a code is scanned, which gives details of the bill of materials used to assemble the truck. This bill of material includes the axle model number which is cross referenced with a traceability matrix to determine the quantity of oil required and confirming the oil filling process with a sticker.

Keywords

Programmable Logic Controller, Rear Axle, Inspection, Oil Filling, Interlocking, Truck, Seizing .

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