International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
A Review of Design of Shock Absorber Test Rig Chaudhari Arati G.1, Shilawat Pooja S.2, Butte Vinod Y.3, Dhage Pradip U.4,Prof.Londhe B.C5 1,2,3,4BE
Student, Department of Mechanical Engineering, SND COE &RC, Maharashtra, India Department of Mechanical Engineering, SND COE &RC, Maharashtra, India ---------------------------------------------------------------------***----------------------------------------------------------------The main objectives behind the design of shock Abstract - Shock absorber device is generally used in all absorber are: To determine dynamic characteristics automobiles. It is an example of under damped vibration system which absorbs maximum amount of kinetic energy and like displacement, vibration etc. of automotive sometimes potential energy. Main purpose of our research is to shock absorber system, to test and indicate the measure transmissibility of shock absorber and to analyze it condition of shock absorber in automotive vehicle, to for different loads and speeds. Effectiveness of the vibration calculate accuracy of shock absorber. 5Professor,
absorber can be measured by transmissibility. And for measurement of transmissibility shock absorber test rig is designed and developed. an experiment on test rig is carried out at various loads and speeds which results to output in the form of sinusoidal waveform on paper by using stylus. The waveform is used to find out the transmissibility at various load-speed combinations. It gives the behavior of shock absorber at various speeds and loads.
1. TERMINOLOGY AND DIMENSIONS 1. Time Period: In the both rectilinear & torsion types of vibration analysis, a steady state mechanical vibration is the motion of system repeated after an interval of time known as the time period. 2. Cycle: The motion completed in any one period of time. 3. Frequency: The number of cycles per unit time is called frequency. 4. Amplitude: The maximum displacement of vibrating body from the mean position. 5. Natural Frequency: Frequency of free vibration of the system. It is a constant for a given system. 6. Resonance: The vibration of the system when the frequency of external force is equal to natural frequency of the system. 7. Damping: Damping is nothing but resistance to motion of vibrating body. 8. Degree Of Freedom: A system is said to be n-degree of freedom system if its needs ‘n’ independent co-ordinates to specify completely the configuration of the system at any instant. A mass is supported by a spring & constrained to more in one direction without rotation in a single degree of freedom system. The same is true for a simple pendulum oscillation in one plane. A crank slider mechanism is also a single degree of freedom system since only the crank angle sufficient to define the illustrated On the other hand a spring supported rigid mass which can move in the direction of the spring & can also have angular motion in one plane has two degree of freedom. A body in a space has degree of freedom three
Key Words: Amplitude, Displacement, Velocity, acceleration, Transmissibility, accuracy of shock absorber.
1. INTRODUCTION Shock absorber is the necessary element of every automobile. It absorbs some amount of force and motion and transmits remaining force and motion to the person who is sitting on vehicle. Input force and motion is given by due to uneven path like speed breakers, ditches etc. The shock absorber testing rig estimates that how much force that shock absorber absorbs and how much motion it transmits. To control the vibrations of suspension system of every automobile Shock absorber is used. If this vibrations are uncontrolled can lead to apocalyptic results like Excessive stresses, Undesirable noise, Looseness of parts, probability of happening accidents increased in very big extent, to minimize these effects proper testing of shock absorber is necessary.
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