Torque Converter

Enter a value in any unit; the others update.

Newton·metre

foot·pound

kgf·m

inch·pound

dyn·cm

Angular Velocity

Rotational speed in mechanical and signal-processing units.

RPM

Hz (rev/s)

rad/s

deg/s

Period (T)— @ r = 100 mm tip speed—

Strain-Gauge Bridge

Wheatstone bridge output for a given strain and configuration. Assumes identical gauges; small-strain approximation.

Strain (µε)

Gauge factor

Excitation (V)

Configuration

Vout— mV / V— Sensitivity—

Vout = (k/4) × GF × ε × Vex (k = 1, 2, or 4)

ADC Resolution & SNR

LSB size, ideal signal-to-noise ratio (6.02·N + 1.76 dB), and ENOB for a given bit depth.

Bits (N)

Full-scale (V)

SINAD (dB)

LSB— Ideal SNR— Quant. noise— ENOB (from SINAD)—

Sampling & Nyquist

Max usable input frequency and a sensible anti-alias filter cutoff for a given sample rate.

Sample rate (Hz)

AA filter order

Stopband (dB)

Nyquist (fs/2)— Suggested AA fc— Usable bandwidth— Sample period—

Cutoff chosen so Butterworth attenuation at Nyquist exceeds stopband target.

Cantilever Beam Stress

Tip load on a rectangular cantilever. Useful for sizing strain gauges and load cells.

Length L (mm)

Width b (mm)

Thickness h (mm)

Tip load F (N)

Young's E (GPa)

Max bending stress σ— Surface strain ε— Tip deflection δ— Moment of inertia I—

σ = 6FL/bh², ε = σ/E, δ = FL³/3EI

Mobile Vibration Analyzer →

Standalone page. Uses your phone's accelerometer to plot a live time-domain trace, FFT spectrum and waterfall. Best opened on a phone.

InputsDeviceMotion · 3-axis FFT256-pt Hann Plotstime + spec + waterfall

Try it on a fan, washing machine on spin, electric toothbrush, or your car's dashboard.

Engineer's Toolkit