Vibration & Mechanical Frequency
Vibration frequency analyzer with real-time FFT, RPM-to-Hz converter, bearing fault frequency calculator (BPFO, BPFI, BSF, FTF), engine vibration analyzer, ISO 2372 vibration severity checker, structural resonance calculator, gear mesh frequency calculator, rotational imbalance detector, modal analysis visualizer, and spring-mass resonance calculator — for maintenance engineers, vibration analysts, reliability teams, and mechanical engineering students.
Available Tools
Vibration Frequency Analyzer
Capture vibration data through your device microphone or audio input and view a real-time FFT frequency spectrum. Auto-detect dominant vibration peaks with Hz labels, overlay 1X/2X/3X RPM harmonics, toggle between time-domain waveform and spectrum view, apply spectral averaging for stable readings, and export data as CSV or image for maintenance reports.
Launch tool →RPM to Hz Converter
Convert RPM to Hz and Hz to RPM instantly with a bidirectional calculator. Auto-generates a harmonic series table (1X through 10X) showing what each order typically indicates — 1X = imbalance, 2X = misalignment, 3X = looseness. Includes presets for common motor speeds (1200, 1800, 3600 RPM), rad/s conversion, and one-click copy for every result.
Launch tool →Bearing Fault Frequency Calculator
Calculate all four characteristic bearing fault frequencies — BPFO (outer race), BPFI (inner race), BSF (ball spin), and FTF (cage/train) — from bearing geometry or by selecting a part number from a built-in database covering SKF, NSK, FAG, and Timken bearings. Shows 2X and 3X harmonics for each fault, animated bearing diagram identifying each fault zone, and descriptions of what each defect sounds like.
Launch tool →Engine Vibration Analyzer
Diagnose engine vibration problems by calculating firing frequency from cylinder count and RPM for 4-stroke and 2-stroke engines. Identify misfire signatures, accessory-driven vibrations (alternator, A/C compressor, power steering pump with pulley ratio input), and engine mount resonance. Visual diagnostic guide maps “vibration at X Hz at Y RPM” to likely causes — for mechanics, car enthusiasts, and marine/diesel technicians.
Launch tool →Structural Resonance Calculator
Calculate natural resonance frequencies for beams, plates, shafts, and strings with selectable boundary conditions — simply supported, cantilever, fixed-fixed, or free-free. Built-in material database (steel, aluminum, wood, concrete, carbon fiber), 1st through 5th mode calculation, animated mode shape visualization, and a resonance danger-zone check that compares natural frequency against your excitation frequency to flag potential failures.
Launch tool →Rotational Imbalance Detector
Confirm whether a machine vibration problem is caused by rotational imbalance by identifying the dominant 1X frequency component from your RPM input. Rates imbalance severity per ISO standards, explains how phase readings distinguish imbalance from misalignment, guides you through single-plane vs two-plane balancing decisions, and includes a trial weight calculator to find correction weight and angle from test run data.
Launch tool →Gear Mesh Frequency Calculator
Calculate gear mesh frequency (GMF) from tooth count and shaft RPM for single-stage, two-stage, and three-stage gearboxes. Displays expected sideband patterns around GMF at shaft speed intervals, identifies what different sideband signatures indicate (tooth wear, eccentricity, broken tooth), calculates gear ratio and output RPM, and computes hunting tooth frequency for long-term wear analysis in power transmission systems.
Launch tool →Vibration Severity Checker
Check a measured vibration velocity against the classic ISO 2372:1974 severity zones (the A/B/C/D scheme later refined, with different boundaries, in ISO 10816 / ISO 20816). Select your machine class (I through IV), enter velocity in mm/s or in/s, and get a color-coded Good / Acceptable / Unsatisfactory / Unacceptable rating on an interactive gauge. Built-in unit converter between displacement, velocity, and acceleration (mm/s, in/s, g), with trending guidance on what to do when levels are rising.
Launch tool →Modal Analysis Visualizer
Visualize structural vibration mode shapes with animated 2D displays for beams, plates, circular membranes, and cylindrical shells. Toggle boundary conditions (fixed, free, pinned) to see how constraints change mode shapes, highlight nodal points and lines where displacement is zero, plot natural frequency vs mode number, and read educational annotations explaining the physics of each mode — ideal for engineering students and structural designers.
Launch tool →Vibration Spectrum Comparator
Overlay two vibration spectra side by side — baseline vs current measurement — with color-coded difference plotting that auto-highlights frequencies where amplitude increased significantly. Save baseline spectra for future comparisons, track amplitude trends at specific frequencies across multiple measurement sessions, and generate annotated comparison reports for predictive maintenance documentation.
Launch tool →Fan Blade Pass Frequency Calculator
Calculate blade pass frequency (BPF) from RPM and blade or vane count for fans, pump impellers, compressors, and turbines. Displays 1X through 5X BPF harmonics, explains what elevated harmonics indicate (flow turbulence, blade damage, wear), includes VFD frequency scaling for variable-speed drives, and helps distinguish discrete BPF signatures from broadband cavitation noise in pumps.
Launch tool →Machine Condition Monitor
Continuously monitor machine vibration with periodic FFT snapshots over extended sessions. Set warning and danger alarm thresholds based on ISO standards or custom values, track overall vibration level and up to 10 specific frequencies on a live trend chart, log sessions with timestamps and annotations, and receive visual and audio alerts when any threshold is exceeded — a browser-based predictive maintenance companion.
Launch tool →Spring-Mass Resonance Calculator
Calculate the natural frequency of spring-mass systems by entering spring constant (N/m) and mass (kg). Add damping ratio to see damped natural frequency and its effect on response, plot force transmissibility vs frequency ratio for vibration isolation design, enter a disturbance frequency to calculate the required spring stiffness for effective isolation, and watch an animated spring-mass visualization oscillating at resonance. Supports 2-DOF coupled systems.
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