Experiments

1. Observing the standing wave

2. Research on the function relationship between chord length, tension, linear density and driving frequency.

Features

1. Different linear density kinds of steel chords are provided, such us Φ0.4mm, Φ0.3mm, Φ0.5mm, all for 2 pieces.

2. Dedicated signal source has a low output impedance. It can use low impedance driving sensor to generate excitation signals. At the same time, the degree of regulation and resolution of frequency is small enough so that it can easily find the resonant frequency.

SEK-8103-01 String Vibration Experiment with Independent Signal Generator

Signal Source

Signal: sinusoid, degree of distortion ≤1%

Range of frequency: 15-100Hz or 100-800Hz

Frequency views: adopting equal precision frequency measurement, displayed by four-digital number

Range: 0-999.9Hz

Resolution: 0.1Hz

Accuracy: ± (0.2% + 0.2Hz)

Output: amplitude 0-5Vp-p, current ≥0.5A, waveform amplitude≥20mV

Mechanics

Maximum of effective length: 80cm

Chord tension: 4.90-49.0N, divided in 10 levels

SEK-8103-02 String Vibration Experiment with Integrated Signal Generator

Signal Source

AC output: 220V±10%, 50Hz

Maximum of driving voltage: V_P-P=25V, provided by instrument

Frequency range: f=0～200Hz (continuously adjustment)

Frequency step: 0.01Hz (Min), 1Hz (Max)

Mechanics

Platform: aluminum alloy

Demision: 1200 x 80 x 40mm ( LxWxH )

Weight: ≈5kg

Experimens and data

1. Verify the relationship between the wavelength of shear waves and tension of chords.

log λ ~ log T slope is K = 0.4984, coefficient of association: r = 0.9988

2. Verify the relation between the wavelength of shear waves and vibrational frequency of wave source

m = 150.00 x 10^-3kg, g_local=9.793m/s² , T = 150.00 x 10^-3 x 9.793 = 1.469N.

The result is show below:

log λ ~ log T slope is K =0.9847, coefficient of association: r = 0.9979

3. Verify the relation between the wavelength of shear waves and density of chord

The real experiment. Experimental condition: position of mounting plate: 10, 70cm, length of chord 60cm