Rajesh Govindan- PhD
- PhD Student at Indian Institute of Technology Roorkee
Rajesh Govindan
- PhD
- PhD Student at Indian Institute of Technology Roorkee
About
14
Publications
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62
Citations
Introduction
Currently working in the area of Human Response to Whole-body Vibration
Current institution
Publications
Publications (14)
This research paper aims to model the failure pattern based on safety factor data at different gear shift configurations for a compound planetary gear assembly. An optimization approach is expounded in this work, which aims to reduce the developed stresses within the gearbox assembly while considering all the gear-shift configurations. Computer-aid...
Background: Study aims to work on the evolution of wing spar in aircraft between 2009 and 2023 using Bibliometric method. Methods: Scopus database was utilized to identify documents related to the keywords “Aircraft,” “Wing,” “Spars,” and “Analysis” from the period of 2009 to 2023. Statistical Analysis was conducted to analyze different types of do...
This chapter thoroughly delves into the utilization of composite materials in structural applications within various industries, including aerospace, automotive, wind energy, and sports equipment. Composites are increasingly replacing traditional materials like steel and aluminum because of their pre-eminent thermal and mechanical properties, with...
The study presents transmissibility responses of 14 male subjects exposed to vertical sinusoidal vibration (2.0–16.0 Hz) at five vibration magnitudes (0.5–1.5 m s ⁻² r.m.s.). The vibration magnitudes are measured at five body locations: head (at the forehead), sternum, abdomen, thigh, and leg, for which the transmissibility at each body location is...
The biodynamic responses of semi-supine humans exposed to varying vertical vibration magnitudes (0.125–1.0
m/s2 r.m.s.) are studied employing a multi-body modeling approach. The model comprises five rigid segments:
the head, upper torso, lower torso, thigh, and leg. The viscoelastic property of tissues at joints and body-support
interface are incor...
The present study proposes a 15-degrees of freedom multibody model of semi-supine humans to estimate the injury risk to a space capsule occupant during landing. The model consists of five body segments representing head-neck, thorax-arms, abdomen, thigh-pelvis, and leg. The semi-supine human model is calibrated using transmissibility responses of e...
The vibration discomfort to the human body in semi-supine posture is currently evaluated as per ISO 2631-1, although it is recommended for sitting, standing, and recumbent posture. The present study investigated the frequency-dependence of subjective responses of semi-supine humans to vertical vibration (0.5-1.5 m s⁻² r.m.s.) across the frequency r...
In the new space vehicle architecture, the astronauts in semi-supine posture would be exposed to elevated vibration level. The present study is focused to develop a multi-body model of human in a semi-supine posture to analyze their biodynamic responses due to vertical excitation. The study proposes a linear 15-DOF model of a semi-supine human in t...
The paper presents the comparative study of the biodynamic response of human body in standing and seated position. A 3D model of the human body in standing and seated position are generated based on anthropometric data for Indian male subject in SolidWorks. The finite element tool, ANSYS-Mechanical was used to perform modal analysis and to obtain n...
In this paper, the dynamic characteristics of the human body in seated posture were investigated using the finite element method. A 3-D model of the human body based on 50th percentile anthropometric data for a 54- kg Indian male was developed considering each body segments as an ellipsoid. The modal analysis is carried out to extract several low-f...
In this paper, the dynamic characteristics of the human body were investigated by developing a 3-D finite element model based on 50th percentile anthropometric data for a 54 kg Indian male subject in standing position by considering human body segments as an ellipsoid. The finite element modal analysis is carried out to extract several low-frequenc...
Computational fluid dynamics (CFD) simulations emerged as an efficient design tool to analyze engine reacting flow processes and develop next generation engines. In this study, CFD analysis of biodiesel fuel
combustion is carried out using ANSYS FLUENT R14.5 software to study the effect of blending ratio on the combustion characteristics in compres...
Questions
Questions (4)
The total walking ground reaction forces (GRF) are measured using a single force plate. For inverse dynamics, GRF is required for each foot separately. Is there any method to do it?
Whether the model parameters such as property or geometry could be tuned to obtain desired frequency response by performing harmonic analysis coupled with direct optimization module of ANSYS workbench?
Mechanical impedance is a measure of how much a structure resists motion when subjected to a harmonic force. It relates forces with velocities acting on a mechanical system. At resonant frequencies, the mechanical impedance will be lower, meaning less force is needed to cause a structure to move at a given velocity. However, in the previous studies on human subjects exposed to vibration, the peak amplitude of mechanical impedance has been observed at the resonance frequency.
Can anybody explain the reason for this contradiction?
Here X represents magnitude (e.g. 1, 2 or 2.5)
In a single frequency sinusoidal excitation, X=1 ms-2 r.m.s. is equivalent to 1.414 ms-2 (0-Peak). Is it same for random excitation too?
