MM 321 UNIVERSAL VIBRATION APPARATUS, Computer Interface
GENERAL DESCRIPTION

This apparatus is used for studying a wide range of vibration experiments namely, pendulums, massspring, free and forced vibration, lateral vibration, torsional vibration, vibration with and without damping.

The apparatus consists of a basic unit for use with optional accessories for individual experiment.

Instruction manual and software for data display and an

TYPICAL EXPERIMENTS

 

Part Name. Description
MM 321-011 SIMPLE PENDULUMS

This apparatus is for determination of period vs pendulum length.

Two spheres made of steel and wood are suspended by cords from the pendulum top plate. A sensor measures the period of vibration.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 65 x 75 x 23 cm
Net weight Approx. 10 kg

 

 

Part Name. Description
MM 321-012 BIFILAR AND TRIFILAR SUSPENSION

This apparatus is for determination of the moment of inertia of an irregular shape object. For the bifilar experiment, a uniform bar is suspended by two cords from the pendulum top plate.

The bar carries two pegged masses. The radius of gyration or moment of inertia of the bar assembly can be determined from the period of torsional vibration.

For the trifilar experiment, a circular plate is suspended by three cords from the pendulum top plate. The circular plate carries three pegged masses. The radius of gyration or moment of inertia of the suspended plate assembly can be determined from the period of torsional vibration.

A sensor measures the period of vibration.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 70 x 75 x 23 cm.
Net weight Approx. 11.5 kg

 

 

Part Name. Description
MM 321-013 COMPOUND PENDULUM

This apparatus is for determination of the center of gravity of the rod.

A round steel rod is attached to the pendulum top plate. The rod can be slided vertically. A sensor measures angular displacement.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

 

 

Part Name. Description
MM 321-014 REVERSE PENDULUM (KATER PENDULUM)

This apparatus is for determination of the acceleration due to gravity.

The apparatus consists of a rod and a sliding cylindrical bob attached to the pendulum top plate. The rod can be slided vertically. A sensor measures angular displacement.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 66 x 70 x 23 cm
Net weight Approx. 10.2 kg

 

 

Part Name. Description
MM 321-015 CENTER OF PERCUSSION

This apparatus is for determination of center of percussion.

The apparatus consist of two pendulums attached to a pendulum top plate. One pendulum is a light steel rod with a steel ball. The other pendulum is a wooden compound pendulum with an adjustable steel weight and knife edges. The length of the simple pendulum is adjusted so that when allowed to swing and create an impact on the compound pendulum, there is no lateral movement of knife edges on the flat support of the pendulum top plate. The impact line on the compound pendulum is the line of center of percussion. A sensor measures period of vibration.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 75 x 85 x 23 cm.
Net weight Approx. 11 kg

 

 

Part Name. Description
MM 321-020 MASS-SPRING APPARATUS.

This apparatus is for demonstration of relation between vibration frequency, spring constant and mass.

A coil spring is suspended from a spring bracket attached to the top frame. Different masses are placed on a platform suspended from the lower end of the spring. Three different springs are provided. The platform rod is guided in a bushing to achieve a vertically free motion.

A sensor measures plat form displacement.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 65 x 80 x 23 cm
Net weight Approx. 11.5 kg

 

 

Part Name. Description
MM 321-030 FREE VIBRATION FOR A BEAM AND SPRING.

This apparatus is for determination of the natural frequency and amplitude of vibration with and without damping.

The apparatus consists of a beam hinged on a trunnion attached to the left vertical frame. The other end of the beam is attached on to a spring which is hung from a spring bracket. A sensor measures the beam displacement. Extra mass or a damper may be put on to the beam. An oil damper is provided for a study on damped vibration.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 75 x 80 x 23 cm
Net weight Approx. 15 kg

 

 

Part Name. Description
MM 321-031 FREE VIBRATION OF A CANTILEVER.

This apparatus is for demonstrate the relation between natural frequency and beam stiffness.

The apparatus consists of a beam is clamped to a fixed support which cantilever length of the beam can be adjusted. Position of the beam can be set as vertical or horizontal. Two beams of different thickness are provided. Weights can be added to the tip of the beam to study the frequency for beam of the same stiffness but has different masses.

An instrument box for power supply with computer interface unitand software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 68 x 76 x 23 cm
Net weight Approx. 11 kg

 

 

Part Name. Description
MM 321-032 FORCED VIBRATION APPARATUS

This apparatus is for a study of frequency ratio vs amplitude and phase angle.

The apparatus is similar to MM321-030 Free Vibration with a variable speed exciter motor attached to the beam. Two unbalanced rotors are attached to the exciter motor via synchronous belt thus providing a forced vibration when the motor runs. Weights can be attached to the rotors. A sensor measures the exciter speed and another sensor measures the beam displacement.

An oil damper is attached to the beam and is used for phase angel measurement.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 80 x 85 x 23 cm
Net weight Approx. 23 kg

 

 

Part Name. Description
MM 321-040 LATERAL VIBRATION APPARATUS

This is for a study of the frequency ratio vs amplitude and phase angle.

The apparatus consists of a beam hinged on a trunnion attached to the left vertical frame. The right end of the beam is attached to two bearings which are free to move in a guide attached to the right vertical frame. An exciter motor is attached to the middle of the beam. An unbalanced rotor is attached to the exciter motor. A weight with its holder is attached to the unbalanced rotor. By running the exciter motor at different speeds, the beam natural frequency can be excited. A sensor measures exciter speed and another sensor measure the beam displacement. An oil damper attached to the beam is used for measurement of phase angle between beam vibration and exciter
motor speed for study of damped vibration.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 75 x 90 x 23 cm
Net weight Approx. 17 kg

 

 

Part Name. Description
MM 321-050 UNDAMPED VIBRATION ABSORBER

This apparatus is for demonstration of vibration absorption by a double cantilever system.

The vibration absorber consists of two masses clamped onto two spring steel cantilevers which is attached to the exciter unit. The system frequency can be tuned by adjusting the masses along the spring cantilevers.

The system can be used to absorb and reduce the unbalanced force. Exciter speed is measured by a sensor.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 65 x 90 x 23 cm.
Net weight Approx. 19 kg

 

 

Part Name. Description
MM 321-060 TORSIONAL VIBRATION APPARATUS, SINGLE ROTOR WITH DAMPING

A rotor is hung vertically from the vibration frame by chucks and a shaft with guide. Three shafts of different diameters are provided. A sensor measures the angular displacement. Eddy current brake is used for damping.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 65 x 90 x 23 cm
Net weight Approx. 15 kg

 

 

Part Name. Description
MM 321-061 TORSIONAL VIBRATION APPARATUS, TWO ROTORS SYSTEMS.

This apparatus is to determine vibration period and the node on the shaft for two rotors.

A single rotor and a compound rotor with axles are attached on the left and right vertical frames. The rotors are free to rotate on the axles which are set at the same height. Each rotor has a chuck which can be clamped onto the same shaft. Three different diameter steel shafts are supplied. A sensor measures angular displacement. A light disc sliding on the shaft locates the node or zero vibration.

An instrument box for power supply with computer interface unit and software for data display and analysis are provided.

Net (unassembled) shipping dimensions W x L x H Approx. 65 x 90 x 23 cm.
Net weight Approx. 18 kg
TECHNICAL DATA

coming soon

OPTIONAL EQUIPMENT

BASIC UNITS (OPTIONAL)

 

Part Name. Description
MM 320-001 Floor Standing Basic Unit

This is a floor standing 30 x 60 mm aluminium profile twin frame on wheels with adjustable footings and a cabinet for housing optional accessories.

The unit can be used for all vibration experiments.

Window opening : 900 x 650 mm
Net (unpacked) shipping dimensions W x L x H : 88 x 107 x 171 cm
Net weight : 68 kg.

 

 

Part Name. Description
MM 320-005 Bench Top Basic Unit

This is a bench top 30 x 60 mm aluminium profile twin frame with adjustable footings. The unit can be used for all vibration experiments except MM320-062.

Window opening : 900 x 650 mm
Net (unpacked) shipping dimensions W x L x H : 36 x 107 x 91 cm
Net weight : 22 kg.

 

 

Part Name. Description
MM 320-007 Pendulum Basic Unit

This is a bench top aluminium profile single column of 30 x 60 mm
aluminium profile with adjustable footings and top attachment for pendulum experiments.

Net (unpacked) shipping dimensions W x L x H : 31 x 56 x 15 cm
Net weight : 4 kg.

 

ACCESSORIES (OPTIONAL)

  • Each experiment requires several accessories to be used with the basic unit or the basic frame. Only one experiment at a time can be carried out. If several experiments are required duplicated accessories need not be supplied. Details of accessories are available on request.
  • Power supply: 220 V 1 Ph 50 Hz. Other power supply is available on request.