Rotating Equipment Drives

Rates an open-belt drive from its pitch diameters: ideal and actual speed ratio under an entered driven-speed loss, belt speed, approximate belt length and smaller-pulley wrap angle from external-tangent geometry, and delivered power, shaft torques and input-side effective belt pull at an entered overall efficiency. It is a drive-performance screen, not a belt selection or tension design.

Rates one involute spur-gear mesh at common pitch: tooth-count ratio, driven speed, driven pitch diameter, output torque at an entered mesh efficiency, and the tangential, radial and normal pitch-point force magnitudes. External and internal meshes differ in rotation sense and centre distance. It is kinematics and mesh statics, not a gear-strength or AGMA rating.

Computes isentropic discharge temperature, specific work and shaft power for an ideal gas from the pressure ratio and the heat capacity ratio, either on the ideal isentropic branch or adjusted for an entered isentropic efficiency. Gas properties stay user inputs; it is a thermodynamic screen, not a compressor selection or a real-gas calculation.

Scales a known pump or fan duty point to a new speed with the affinity laws: flow with the speed ratio, pressure rise with its square, shaft power with its cube. The target may be entered as a speed or as a nonnegative speed ratio. It assumes unchanged geometry and comparable similarity conditions, so it is a screening scaler, not a substitute for a vendor performance curve.

Solves any one of shaft power, torque or rotational speed from the other two, then rates a solid or hollow circular shaft in torsion: polar moment, maximum shear stress, angle of twist, torsional stiffness and maximum shear strain. It is a strength-of-materials screen, not a fatigue, critical-speed or shaft-design determination.

Computes the steady-state response of a linear single-degree-of-freedom oscillator to harmonic force or harmonic base displacement: natural frequency, damping ratio, frequency ratio, magnification or transmissibility, response amplitude, phase lag, and peak velocity and acceleration. It is a response screen, not a vibration-acceptability determination.