The VIBRATIONS range enables clear and comprehensive learning of VIBRATIONS covering a variety of theories and topics. An understanding of the way in which materials and components react to excitation, is fundamental when studying the application of loads on a variety of fixed structures and rotating machinery. The VIBRATIONS range forms a comprehensive range of equipment, from simple pendulums, beam vibrations to complex structural vibrations. All are suitable for demonstration and experimental work.

All the VIBRATIONS hardware operates in a standalone mode, with some being supplied with Data Acquisition Interfaces and Software.



HVT1 Simple Pendulum

A simple pendulum consisting of a cord with a ring at the top end and a sliding pendulum mass.

HVT2 Reversible Pendulum

The reversible pendulum consists of a rigid metal bar with two pivot points, one near each end of the bar. It can be suspended from either pivot and swung. The two pivots are adjustable on the rigid metal bar and this allows the periods of swing to be adjustable. In use, it is swung from one pivot, and the period timed, and then turned upside down and swung from the other pivot, and the period timed.

HVT3 Compound Pendulum

A wall mounted bracket has a metre long bar suspended from its knife-edge pivot point. Attached to the pendulum bar is a movable mass. The mass can be fixed along the pendulum bar in seven positions.

HVT9 Torsional Vibration Apparatus

The equipment provides a basic range of torsional vibration experiments. A wire rod clamped in a wall mounted bracket has a heavy disc attached to the lower end. A solid ring can be located over the disc to increase its inertia. Steel and brass rods of two different diameters are included. All brackets, clamps and adapters are supplied.

HVT11 Vibration of a Spiral Spring

Spiral springs are used to provide a restoring torque to an oscillating shaft when it rotates through an angular displacement. With this apparatus the student can easily calculate the theoretical simple harmonic motion of the spring, and compare the value with experimental results. The wall mounted unit consists of a spiral spring coiled from a length of steel strip creating an effective length, attached to a shaft mounted in ball bearings. A cord carrying a load hanger is wound around the shaft, and a load applied to twist the spring. Spring deflection is measured with an attached 360° scale. A cord and load hanger is supplied. A set of inertia discs is supplied which can be attached to the shaft to change the frequency of oscillation, measured by the stop watch provided.

 

HVT12 Universal Vibration Apparatus

A rectangular steel beam pivots at one end from a bracket and bearing attached to the HVT12f Vibration Frame. A spring is attached to the free end of the beam to enable the beam to vibrate. The horizontal position of the spring can be adjusted using the integral adjustment system

Beam displacement is measured using an LVDT displacement transducer from the HAC90 Tachometer. The output signal from the LVDT can be displayed using the HVT12k data Acquisition system.

HVT13 Torsional Vibration Apparatus

This bench top mounted unit is used to study torsion and torsional vibration. The apparatus is constructed around a profiled aluminium base onto which are mounted 4 vertical chuck pillars. Each pillar contains a central shaft running in precision bearings with a chuck at one end which grips a torsion specimen. Each chuck also contains a large disc of varying mass and inertia. With these chucks it is possible to assemble a torsion specimen with up to 3 masses. Vibrations are transmitted into the torsion specimen by means of an exciter, which is electronically speed controlled from the main control unit. Angular movement sensors on the chuck pillars provide the amplitude of vibration as an electrical signal. The control unit conditions these signals and makes them available to view on the HVT13k Data Acquisition System. Static twist of the specimen is achievable using the attachable protractor, pointer, hanger and calibrated weights supplied.

Optional Accessories: HVT13k

 

HVT12c Beam Bending (Transverse) Vibration Module

Experimental module for the vibration analysis of transverse beam bending. The apparatus consists of two end fixings that support a beam. One end allows beam rotation only, whilst the other end allows rotation and horizontal movement only. The beam is forced to vibrate using a clamp on motor exciter supplied. This exciter operates from a high speed motor and has two eccentric masses attached at either end of the motor shaft. The rotation of the masses induces the excitation frequency of the beam. Additional masses can be added to the motor exciter to change the experimental parameters. The vibration of the beam is monitored using the sensor of the HAC190.

The HAC190 optional accessory is required to control the speed of the motor exciter and the HVT12k optional accessory to display the excitation frequency and output frequency.

 

Optional Accessories: HAC190, HVT12k, HVT12f

HVT12d Vibration Absorber

Experimental module, which fits into the HVT12f Vibrations frame (not supplied) making up part of the HVT12 Universal Vibration Apparatus.

HVT12f Vibrations Frame

The HVT12f Vibration Frame offers the ideal working frame for all of the HVT12 Universal Vibration experiment modules. Manufactured from high quality, ergonomic aluminium profile, it comprises solid side profiles for rigidly mounting experiment components. Dual upper and lower members create internal working dimensions of 1.22m x 0.76m for mounting experiments. Profile grooves create an accurate alignment of experiment components, and pre-assembled fasteners are integrated into the grooves for assembling of specific experiments within the HVT12 range. The HVT12f Vibrations Frame comes fully assembled with no need for tooling or lengthy assembly.

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