1.Pass-by Noise Reduction in Motorcycles by designing a Hybrid Muffler


 

 

Community noise regulations put stringent requirements on road vehicle exterior noise emission. Regulations apply to cars, trucks, buses, motorcycles, and scooters. Manufacturers have to certify that their vehicles comply with noise emission standards by measuring according to procedures defined by international standards, commonly known as Pass-by noise tests.
The purpose of this work is to develop h hybrid muffler for motorcycles manufactured by India Yamaha Motors Pvt Ltd. The project deals in studying Indian and European Noise test standards; designing muffler using CAD and analysing the designs; choosing the materials for the muffler and performing tests on the materials; and finally manufacturing the muffler and performing the pass-by noise tests on the muffler.
The muffler models are designed using softwares like SolidWorks, Catia; and the analysis is done on softwareslkeAbaqus, COMSOL, etc. Finally the muffler is manufactured in the industry.
The final pass-by Noise tests show that after using the hybrid muffler the noise emissions reduce to around 75 dB.Analysing the new muffler design shows that the backpressure is very less comparing to the previous models, resulting in increased efficiency of the engine. This report also includes the tentative coast of the hybrid muffler.

 

 

2. Shock Absorber Design for Rickshaw



 

 

Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. Suspension systems serve a dual purpose — contributing to the vehicle's road handling and braking for good active safety and driving pleasure, and keeping vehicle occupants comfortable and reasonably well isolated from road noise, bumps, and vibrations, etc. These goals are generally at odds, so the tuning of suspensions involves finding the right compromise .

While shock absorbers serve the purpose of limiting excessive suspension movement, their intended sole purpose is to dampen spring oscillations. Shock absorbers use valving of oil and gases to absorb excess energy from the springs. Spring rates are chosen by the manufacturer based on the weight of the vehicle, loaded and unloaded. . It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the forces acting on the vehicle do so through the contact patches of the tires. Along with hysteresis in the tire itself, they dampen the energy stored in the motion of the unsprung weight up and down. Effective wheel bounce damping may require tuning shocks to an optimal resistance.

 

 

3. Smart Pump



 

 

Project: In Punjab, electricity that is provided free of cost for irrigational purposes is usually misused
and diverted. The wastage of electricity leads to an erratic power grid and unreliable power supply and the wastage of water have led to declining water tables (the problem has reached alarming levels).
Thus, a project aimed to develop a system to tackle these issues keeping the socio-economic factors in mind was planned and initiated. The system would be such that it discourages wastage of water and electricity. A “Smart Pump” mechanism (for water metering and pumping) was developed in order to check and regulate the usage of water and electricity for irrigation by farmers.
The proposed system intends to give farmers a “Water Balance” for a fixed period of time. The farmer can use his/her quota of water during the fixed period. As and when the allotted quota is used up, the electric connection to the pump is cut off. The connection is re-established when the “Water Balance” is recharged. The recharge can be only done after the fixed period thus encouraging judicious use of the allotted water balance thereby checking wastage. The prototype of the system was developed for the first phase of the project (September 2011 – April 2012) and the next phases will be worked upon by the current students of IIT Ropar.

 

 

4. Mode Shapes of Cantilever beam



 

 

The modal frequencies and mode shapes of a cantilever plate experimentally. 
 

 

5. Mode Shapes of Aeroplane Model



 

 

Modal analysis is the study of dynamic properties of the structure under vibrational excitation. When a structure undergoes an external excitation, its dynamic responses are measured and analyzed. The field of measuring and analyzing is called the modal analysis. Modal analysis is applied to find the various periods at which the structure will naturally resonate at, by using the structure's overall mass and stiffness.
 

 

6. Modal analysis of a L-Shaped Structure



 

 

L shaped element is very important as many of the mechanical machines have L shped structure, as in a Drill press, CNC milling and drill machines or inherently any structure with a overhanging arm. So it becomes very important that modal analysis be done on this structure as these machines tend to work in high vibration environment.

Modal analysis is the study of the dynamic properties of structures under vibrational excitation. Modal analysis is the field of measuring and analyzing the dynamic response of structures and or fluids when excited by an input. Examples would include measuring the vibration of a car's body when it is attached to an electromagnetic shaker, or the noise pattern in a room when excited by a loudspeaker.

 

 

7. Foam surrounded by plastic sheet(Sound Barrier)



 

 

Noise barriers are effective sound attenuation and noise reduction option
Various factors are involved in the production of noise barriers:
(a)Material of the barrier
(b)Shape and orientation of the barrier
(c)Surface properties of the barrier
(d)Sound source

 

 

8. Vibration Analysis of Multistorey Building



 

 

Vibration testing is accomplished by introducing a forcing function into a structure, usually with some type of shaker. Alternately, a DUT (device under test) is attached to the "table" of a shaker. For relatively low frequency forcing, servohydraulic (electrohydraulic) shakers are used. For higher frequencies, electrodynamic shakers are used. 
 

 

9. Model Frequencies of Steering Wheel



 

 

The main objective of this project was to study the vibrations of a steering wheel virtually by using any analysis software. After studying and analysing the vibrations computationally and getting the results of different mode shapes and mode frequencies; the same were to be verified experimentally by using a shaker.