The apparatus provided comprehensive unit to perform the vibration experiments. A universal frame is provided upon which quick and easy assembly of various experiments can be done. The unit is self-contained to safely store spares. The students can easily assemble the experiments and study the theory of vibrations practically.

Experiments

Following experiments can be performed with this unit:

• To verify the relation simple pendulum
• To verify the relation of compound pendulum & to determine the radius of gyration
• To study radius of gyration of bi-filar suspension
• To study the undamped free vibration of spring mass system
• To study the longitudinal vibration of helical coiled spring
• To study the forced vibration of simply supported beam for different damping.
• Undamped torsional vibrations of single rotor system
• Undamped torsional vibrations of double rotor system
• To study the damped torsional vibration of single rotor system and to determine the damping co-efficient
• Verification of Dunker ley's Rule
• To study the forced damped vibration of spring mass system

Utilities Required

• Floor Space: 2.5 m x 2.5 m approx.
• Power Supply: 230V AC. 5 Amp with earth.

Apparatus is a motorized unit consisting of a camshaft driven by a variable speed motor. The shaft runs in a double bearing. The free end of the camshaft has a facility to mount the cam easily.

The follower is properly guided in gunmetal bushes and the type of follower can be changed according to the cam under test. Graduated circular protractor is fitted co-axial with the shaft. And a Dial Gauge fitted on the follower shaft is used to note the follower displacement for the angle of cam rotation. A spring is used to provide controlling force to the follower system. Weights on the follower shaft can be adjusted as per the requirement. An arrangement is provided to regulate the speed. The apparatus is very useful- for testing the cam performance for jump phenomenon during operation. On this apparatus the effect of change of inertia forces on jump action of earn-follower during operation can be observed. It is useful for testing various cam & follower pairs. Three cams and three followers will be supplied with the apparatus. Theses are already hardened to reduce the wear.

Experiments

With the help of combination of provided cams and followers following experiments can be conducted:

• To plot the n-Q (Follower displacement Vs Angle of rotation) curves for different cam follower pairs
• The follower bounce can be observed by using a stroboscope (Optional) & effect of follower weight on bounce can be studied.
• To study the effect of follower weight on bounce
• To study the effect of spring compression on bounce
• The tests can be repeated by changing compression springs, follower weights and cam speed.

Utilities Required

• Electricity 0.5 kW, 220 V, Single Phase
• Stroboscope(Optional)

The set up is designed to study the whirling of shafts. The set-up consists of a sturdy M.S. frame, variable speed motor bearing holders etc. Different bearing can be fitted in bearing block to have different end conditions i.e. (i) both end fixed, (ii) one end free and one end fixed etc. A variable speed motor is provided to drive the shaft along with speed control unit as the test is destructive, hence the shaft cannot be used again.

Experiments

• Display of various modes of whril for a shaft with:
  • a) Both ends directionally fixed.
  • b) One ends fixed and other free
  • c) Both ends directionally free.
• Modes of vibrations can be studied and frequency can be measured in each case.

Utilities Required

• Floor area of 2m x 0.5 m
• Electric supply of 230V, AC

This equipment is designed for carrying out the experiment for balancing a rotation mass system. The apparatus consists of a steel shaft fixed in a rectangular frame. A set of four blocks with a clamping arrangement is provided. For static balancing, each block is individually clamped on shaft and its relative weight is found out using cord and container system in terms of number of steel balls. For dynamic balancing, a moment polygon is drawn using relative weights and angular and axial position of blocks is determined. The block are clamped on shaft is rotated by a motor to check dynamic balance of the system. The system is provided with angular and longitudinal scales and is suspended with chains for dynamic balancing.

Experiments

• To balance the masses statically and dynamically of a single rotating mass system
• To observation of effect of unbalance in a rotating mass system

Utilities Required

• Electricity 0.5kW, 220V, Single Phase

The set up consists of heavy disc mounted on a horizontal shaft, rotated by a variable speed motor. The rotor shaft is coupled to a motor mounted on a trunion frame having bearings in a yoke frame, which is free to rotate about vertical axis. A weight pan on other side of disc balances the weight of motor. Rotor disc can be move about three axis. Torque can be applied by calculating the weight and distance of weight from the center of rotor. The gyroscopic couple can be determined.

Experiments

• Experimental justification of the equation T = 1 w. wp for calculating the gyroscopic couple by observation and measurement of results for independent vibrations in applied couple T and precession wp.
• To study the gyroscopic effect of a rotating disc
• Observation of gyroscopic effect of rotating disc

Utilities Required

• Electric supply: 230 V AC, Single Phase.
• Bench area: 1m x 1m

The set-up is designed to study the working of different governors normally used to control the speed. It consists of a main spindle, mounted vertically on the base plate. This spindle is driven by a variable speed Motor which is also mounted vertically on the same base plate. Anyone governor assembly out of four can be mounted on spindle. Speed control unit controls the spindle speed. A graduated scale is fitted to the sleeve to measure the displacement.

Experiments

Determination of characteristic curve of a sleeve position against speed of rotation for all governors

• To study the effect of varying the mass of the center sleeve in Porter and Proell Governor
• To study the effect of varying the initial spring compression in Hartnell Governor
• To study the determination of characteristics curves of radius of rotation against controlling force (Actual & Theoretical) for all governors

Utilities Required

• Power Supply: 230 V AC, Single Phase.
• Floor Space: 1.5 x 1.5 m
• Tachometer to find out RPM

The apparatus consists of a plain steel shaft excavated in a bearing and directly driven by a FHP Motor. The bearing is freely supported on the shaft and sealed at the motor end. The speed of the motor is controlled accurately by the speed control unit and it can be made run in both directions. Twelve equal-spaced pressure taping around the circumference and four along the axis are provided and are connected to manometer by PU Tubing so that the pressure head of oil in all tubes can be observed at a time. The bearing can be loaded by attaching weights to the arm supported beneath it.

Experiments

• To study the pressure profile of lubricating oil at various conditions of load and speed
• Plotting the Cartesian polar pressure curves
• To measure the frictional torque and power transmit

Utilities Required

• Electric supply : 230 V AC, Single Phase.
• Bench area : 1.5 x 1.5 x 4 m
• Tachometer to find out RPM of journal
• Oil SAE 40 about 5 Ltrs.

The set-up is designed to study Coriolli's Component of Acceleration of a slider crank mechanism. Here the mechanical slider system is replaced by a continuous stream of water flowing through a steady rotating pair of tubes. These tubes can be rotated at various speeds by using a swinging field motor which also acts as dynamometer. A Perspex window on top of the tank gives clear view of the process and prevents splashing of the water over the side of the tank. The dynamometer continuously measures torque applied to the rotating tubes. The equipments is self contained, water re-circulating, provided with its own speed control unit and separate water circulating pump.

Experiments

• To determine Coriolli's Component of Acceleration at various speeds of rotation and water flow rates

Utilities Required

• Water Supply & Drain
• Electricity 0.5 kW, 220 V, Single Phase

The apparatus consists of a pad, which can be tilted to the required angle. An endless belt, which moves, beneath the pad, carries the oil over its surface from oil bath. When the pad is tilted over the oil film, pressure is developed, the pad is provided with pressure tapings parallel and perpendicular to belt direction. The pressure distribution is measured over a multi tube manometer. A variable speed motor drives the belt. The tilting angle and minimum gap between pad and belt can be adjusted and characteristics thus can be studied at various gaps, inclination and relative surface speeds.

Experiments

• Demonstration of pressure development
• Plotting pressure variation curve in longitudinal & transverse direction of a pad for various speeds and pad inclination
• Demonstration of cavitations phenomenon

Utilities Required

• Power Supply: 230 V AC, Single Phase.
• Floor space: 1m x 1.5 m (approx).
• SAE-40 oil for carrying the test (approx 3 Ltrs.)

This apparatus is useful for measurement of power transmitted for various input power conditions with varied belt tension. Belt slip or creep also can be measured. The apparatus consists of a variable speed D.C. Motor, driving pulley and driven pulley of equal diameters. The pulleys are mounted on input shaft (motor shaft) and output shaft. The driven pulley can slide on the base only with bearing block to change the initial tension in belt. Brake drum is mounted on the output shaft, which helps to measure power output. The motor speed is varied by Thyristor Control D.C. Drive. A double channel digital speed indicator indicates driving and driven pulley speeds. With the help of Stroboscope (not in the scope of supply) it is possible to demonstrate the slip of belt on driving and driven pulley.

Experiments

• To measure co-efficient of friction between pulley material and different belt materials.
• To measure power transmitted with varied belt tension.
• To measure percentage slip at fixed belt tension by varying load on the Brake drum and plot the graph of (T1- T2) v/s percentage slip i.e. "Slip Characteristics" Finding a Creep Zone from graph.
• To measure belt slip speed and observe the limiting value of load at constant speed when the slip just starts
• To study creep of belt

Utilities Required

• Electricity 0.5 kW, 220 V, Single Phase
• Stroboscope