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Whenever a human body stands on a platform like a bus, train, etc then the waveform, frequency, amplitude, and duration due to vibrations can be changing and these variations produce some advantages in muscles and bone mineral density whereas high acceleration of platform viewed as dangerous. The reason behind this is the resonance of the human body that depends upon some factors: the seat surface material, the posture, vibration magnitude, and frequency, etc. In this study, modal and harmonic response analysis has been performed to calculate the natural frequencies of Indian human male subjects in standing posture conditions under un-damped and damped free vibration conditions. With the help of this, we are capable to know how these vibrations affect our muscles, bones, joints, etc. Joint studies of the human body help us to replace body joints in case of any serious injury or in emergency and multibody dynamics, modal analysis, and harmonic response play crucial roles in these effects. This study shows the vibration effects of transmissibility and stresses on the knee joints and neck joints of the human body. For this purpose, a revolute joint is separately designed and fixed at the location of joints in human subjects to understand the effect of these vibrations. The results are determined in this study are within the frequency range of 0-20 Hz.