International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 05 Issue: 05 | May-2018 www.irjet.net p-ISSN: 2395-0072 © 2018, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 1104 Design and Performance Analysis of Mechanical-Hydro-Pneumatic Suspension System for Motorbikes Kaustubh Kale 1 , Prof. G. R. Kesheorey 2 1 Vindhya Institute of Technology and Science, Indore 2 Assistant Professor, Dept. Of Mechanical Engineering, Vindhya Institute of Technology and Science, Indore, M.P., India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - During Travelling on normal motorbikes like Hero Splender, Bajaj Discover, CT-100, and Honda Shine etc, The comfort level is not good as like Royal Enfield, Harley- Davidson, Ducati, Kawasaki, BMW, Honda Gold, Benelli, Norton, Hayabusa, Triumph, Tork because the one reason of such issue is that available suspension system in Normal Motorbikes is not up to the mark of comfort and safety, Suspension perceived as most comfortable when the natural frequency is in the range of 60 to 90 cycles per minute (CPM), or about 1 Hz to 1.5 Hz. When the frequency approaches 120 CPM (1.5-2Hz), occupants perceive the ride as harsh. A high-performance sports motorbike will have a stiffer suspension with a natural frequency of about 120 to 150 CPM (2 to 2.5 Hz). So the available suspension system of these vehicles must be redesigned to achieve the comfortable ride as per the standard range of comfort frequency of suspension i.e. 0.5-1.5 Hz. Key Words: Smooth ride, high level of comfort, reduced jerk transfer, modified frequency of suspension in range 0.5-1.5 Hz, Improved comfort level. 1. INTRODUCTION During passing over the speed breakers, bumps and obstacles of the roads the jerk is directly transferred to the passengers, which is too high even traction of tires because of non – standard roads causes the jerk in the vehicle which is also transferred to the passengers. This shows that the available suspension system does not give effective comfort to the rider. The cemented RCC roads are also a reason behind the discomfort during the ride, as medically they as suitable for the passengers, as in case RCC roads the jerks and bumps are directly transferred to the passengers which may lead to back pain, spinal injury etc. So available suspension system of the vehicles must be redesigned to achieve the comfortable ride as per the standard range of comfort frequency of suspension i.e. 0.5 - 1.5 Hz. The desired effect can be achieved by the modification of the available suspension system for normal bikes and i.e. Mechanical Hydro-Pneumatic Suspension System. 2. LITERATURE SURVEY For the analysis, part researchers employ the Theoretical, Numerical and Finite Element Methods (FEM). The study concludes FEM is the best method for calculating the stress, life cycle and shear stress of helical compression spring Lavanya et al. [1]. The objective of Dr Dhananjay et al [2] is the performance analysis of a shock absorber spring by varying stiffness can be obtained by doing optimization to obtain maximum comfortable ride with Pro-E and ANSYS. Based on numerous investigations, studies and developments of automotive suspensions structures, models, and features of various automotive suspensions, weight, cost, ride comfort, handling performance, reliability, dynamic performance, energy regeneration, and commercial maturity, the concept of the suggested suspension system can provide desirable results which are supported by the Ansar Allauddin Mulla and Deepak Rajendra Unaune et al. [3]. Ali M. Abd-El-Tawwab et al [4] performed an experiment which reveals that, by using active suspension systems compared with a passive suspension system a significant improvement in ride performance can be obtained. The article provided on the theoretical and experimental foundations which determine parameters of gas springs with constant gas mass, provides good results by L. KONIECZNY, R. BURDZIK, T. WĘGRZYN et al. [5]. The details of dimensional calculation for designing the suspension system found good from DzThe Shock Absorber (andbook,dz by John C. Dixon et al. [6]. The type of suspension can be decided from the basic three models, the study done by Babak Ebrahimi et al [7], gives a better and clear idea to consider the passive suspension system will be the suitable design of suspension in the considered case. The detailed work done by Karthikeyan S.S, Karthikeyan V, Leoni Praveen C, Manigandan G and Rathish R, et al [8], on the designing of helical spring with variable pitch, to consider the facts for designing the mechanical element for the desired load. The design and performance analysis done by Dr. Ashesh Tiwari and Atreya Pathak et al [9], shows that the hybrid system can be easily applied to any vehicle to