7 publications
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2D LiDAR Based Obstacle Detection System for Obstacle Avoidance in 3D SpaceBy Rajesh Sangalge, Nahas Pareekutty, Sreenath Ravi, Rajeeva S, Sundaresan Poovalingam, Timothy Ochmann, Sathish Kumar Ranganathan
Abstract: Obstacle detection is an important feature in autonomous systems to enhance safety and to improve reliability of the operations in the unknown environment. Various techniques are adopted to detect the obstacle using passive and/or active sensors. Fusion of active and passive sensor techniques are also considered in some cases for better detection of obstacles and improve the accuracy of the detection with safe distance especially in an unmanned aerial robotic …
Published in Journal of Advancements in Robotics · Vol. 9, Issue 3, 2022 · pp. 1–12 Read article →
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Buckling Strength of Metallic and Composite Plates with Small and Large Hole at Different LocationsBy Sundaresan Poovalingam, Rajeshwar Baddam, Ravindra Kiragi
Abstract: Most of the aircraft structures will experience a buckling phenomenon due to compressive loads. The cutouts like system small and large holes, lighting holes etc. are introduced in the aircraft structure at different locations for accessing aircraft inside and for passing electrical wires and ducts. The stress rises around these holes due to removing area in the panel and buckling phenomena will become further critical in aircraft structures. The cutouts …
Published in Journal of Aerospace Engineering & Technology · Vol. 11, Issue 2, 2021 · pp. 18–37 Read article →
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Analytical Solution to Non-Linear Spring Mass System Free Vibration through Stepwise LinearizationBy Prasanth Gopi Nair, Sundaresan Poovalingam
Abstract: Classical method of solution of free vibration of non-linear spring mass systems has been iterative in nature as no methodology has been developed so far to obtained close form solutions. Proper time step needs to be defined upfront for obtaining realistic convergent solutions. This involves thorough understanding of the system dynamics is essential and is very challenging to the engineers at times to obtain the solution. Many a time the …
Published in Journal of Aerospace Engineering & Technology · Vol. 9, Issue 3, 2019 · pp. 31–39 Read article →
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Predicting Elastic and Plastic Stress Concentration Factor using Notch Strength AnalysisBy Ravindra Kiragi, Sundaresan Poovalingam, Indradeep Bhadra
Abstract: Structural sizing is getting more sophisticated as weight and cost of any structure is important. Weight optimization is a key player in enhancing business revenues and reducing fuel consumption for a greener planet. Thus, millennial designers attempt to develop weight optimized structures, while meeting structural stiffness, strength and integrity, and safety requirements as specified by international certification agencies. This can be achieved by innovative analyses approaches, which predict realistic factor …
Published in Journal of Aerospace Engineering & Technology · Vol. 9, Issue 1, 2019 · pp. 1–14 Read article →
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Analytical Solution to Single Degree of Freedom Bi-Linear Spring Mass Systems Transient VibrationBy Prasanth Gopi Nair, Sundaresan Poovalingam
Abstract: Conventional approach to solution of linear systems under transient vibration has been through Convolution integral or Duhamel integral method which employs the method of superposition of linear solutions to obtain the total solution. Principle of superposition is not possible for non-linear systems and hence transient vibration solution cannot be obtained through classical methods. Nevertheless, the solution to transient vibration for each domain can be obtained as a sum of homogeneous …
Published in Journal of Aerospace Engineering & Technology · Vol. 8, Issue 2, 2018 · pp. 7–18 Read article →
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Stress Concentration Factors for Stiffener Run-Out RegionsBy Prasanth Gopi Nair, Jayaprakash Dasari, Sundaresan Poovalingam
Abstract: Stiffener and stringer run-out is a common design feature followed in aircraft structures such as fuselage, wings and empennage. The run-outs are necessary due to specific structural and interface requirements. These run-outs act as a stress raisers similar to any geometric discontinuity in these structures. The stress concentration factors (SCFs) are available only for stiffener with 90 º run-outs (also known as shoulder fillets) in the literature. In the absence …
Published in Journal of Aerospace Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 51–61 Read article →
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Rib Flange Bending MethodsBy Ravindra Kiragi, Sundaresan Poovalingam, Ravikumar Subbaiah, Indradeep Bhadra
Abstract: Weight of aircraft structures plays a vital role in enhancing the business revenues of the manufacturers and end customers. Thus, the aircraft designers and manufacturers attempt to produce structures that are optimized for weight, cost, and at the same time serves the structural integrity, performance and safety requirements as specified by the certification agencies. One way to approach the problem of excess weight is to figure out the innovative analysis …
Published in Journal of Aerospace Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 24–38 Read article →