Free And Forced Vibrations

Free And Forced Vibrations

Experiments

• Free and forced vibrations of a rigid beam and spring
• Free and forced vibrations of a flexible pinned–pinned simply supported) beam
• Using Rayleigh’s approximation to predict vibration frequenc
• Frequency of oscillation and varying mass
• Finding the ‘beam only’ frequency using Dunkerley’s Method
• Phase difference between displacement, its derivatives and measured acceleration
• Damped free and forced oscillations and damping coefficient
• Phase relationship between the applied force and beam position for different damping values
• Demonstration of a 2 degree of freedom (2DOF) system
• Demonstration of an undamped vibration absorber

Operating Conditions

• Operating environment: Laboratory environment
• Storage temperature range: –25°C to +55°C (when packed for transport)
• Operating temperature range: +5°C to +40°C
• Operating relative humidity range: 80% at temperatures < 31°C decreasing linearly to 50% at 40°C

Specifications

• Nett dimensions and weight: 1280 wide x 450 mm front to back x 800 mm high(assembled) and 80 kg
• Other parts approximately 4 kg
• Approximate packed dimensions and weight: 1 m 3 and 120 kg

Other Parts Included

• Storage tray and tools
• Spring for beam and spring tests
• Dashpot damper
• 500 mL of non-toxic fluid (for dashpot damper)
• Vibration absorber
• 5 x 400 g masses