{"id":100141,"date":"2026-02-15T20:19:55","date_gmt":"2026-02-15T20:19:55","guid":{"rendered":"https:\/\/vibromera.eu\/?post_type=calculator&#038;p=100141"},"modified":"2026-07-12T16:08:19","modified_gmt":"2026-07-12T16:08:19","slug":"journal-bearing-frequencies","status":"publish","type":"calculator","link":"https:\/\/vibromera.eu\/pl\/calculators\/journal-bearing-frequencies\/","title":{"rendered":"Journal-bearing Sub-synchronous Frequency Screening"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"WebApplication\",\"name\":\"Journal-bearing Sub-synchronous Frequency Screening Worksheet\",\"description\":\"Calculate shaft order, a user-documented candidate band and two-speed tracking residuals without diagnosing oil whirl or oil whip from speed alone.\",\"url\":\"https:\/\/vibromera.eu\/calculators\/journal-bearing-frequencies\/\",\"applicationCategory\":\"Engineering 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0}.vc-toggle{width:100%;padding:18px 24px;border:0;background:#fff;text-align:left;font:700 18px var(--display);cursor:pointer}.vc-body{max-height:0;overflow:hidden}.vc-section.vc-open .vc-body{max-height:30000px}.vc-inner{padding:0 24px 24px;border-top:1px solid var(--bl);color:var(--sec)}.vc-inner h3{font-family:var(--display);color:var(--ink);margin:24px 0 10px}.vc-table-wrap{overflow-x:auto}.vc-table{width:100%;border-collapse:collapse;font-size:13px}.vc-table th,.vc-table td{padding:9px 10px;border:1px solid var(--bl);text-align:left;vertical-align:top}.vc-table th{background:var(--alt);color:var(--ink)}.vc-code{font-family:var(--mono)}.vc-footer{text-align:center;padding:30px;color:var(--mut);font-size:13px}.vc-section a,.vc-footer a{color:var(--c)}@media(max-width:650px){.vc-grid,.vc-rgrid{grid-template-columns:1fr}.vc-wide,.vc-primary{grid-column:auto}.vc-form{padding:18px}.vc-calculator{padding-left:12px;padding-right:12px}.vc-header{padding:34px 12px 30px}.vc-rv{font-size:15px}.vc-primary .vc-rv{font-size:21px}}<\/style>\n<div class=\"vc-calculator\" id=\"vc-sub\"><header class=\"vc-header\"><p class=\"vc-eyebrow\">Fluid-film bearing \u00b7 evidence-led screening<\/p><h1 class=\"vc-title\">Journal-bearing Sub-synchronous Frequency Screening<\/h1><p class=\"vc-sub\">Convert measured spectral lines to shaft order, project only a band documented by your procedure or model, and compare two operating speeds. The worksheet does not generate an oil-whirl or oil-whip diagnosis from RPM.<\/p><div class=\"vc-badges\"><span class=\"vc-badge\">ISO 13373 scope disclosed<\/span><span class=\"vc-badge\">No universal 0.42\u20130.48\u00d7 rule<\/span><span class=\"vc-badge\">Decimal point or comma<\/span><\/div><\/header>\n<div class=\"vc-card\"><form id=\"vc-form\" class=\"vc-form\" autocomplete=\"off\"><div class=\"vc-grid\"><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-rpm-a\">Run A shaft speed (r\/min)<\/label><input class=\"vc-input\" id=\"vc-rpm-a\" inputmode=\"decimal\" placeholder=\"e.g. 3000\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-f-a\">Run A measured line (Hz)<\/label><input class=\"vc-input\" id=\"vc-f-a\" inputmode=\"decimal\" placeholder=\"e.g. 21.5\"><p class=\"vc-help\">Must be measured and below shaft frequency.<\/p><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-rpm-b\">Run B shaft speed (r\/min, optional)<\/label><input class=\"vc-input\" id=\"vc-rpm-b\" inputmode=\"decimal\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-f-b\">Run B measured line (Hz, optional)<\/label><input class=\"vc-input\" id=\"vc-f-b\" inputmode=\"decimal\"><p class=\"vc-help\">Enter both Run B fields or leave both blank.<\/p><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-low\">Documented candidate order \u2014 lower<\/label><input class=\"vc-input\" id=\"vc-low\" inputmode=\"decimal\" placeholder=\"source-specific; no default\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-high\">Documented candidate order \u2014 upper<\/label><input class=\"vc-input\" id=\"vc-high\" inputmode=\"decimal\" placeholder=\"source-specific; no default\"><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-fn\">Documented lateral natural frequency (Hz, optional)<\/label><input class=\"vc-input\" id=\"vc-fn\" inputmode=\"decimal\"><p class=\"vc-help\">Use a validated modal\/run-up\/coast-down result for the same configuration.<\/p><\/div><div class=\"vc-field\"><label class=\"vc-label\" for=\"vc-mode\">Interpretation boundary<\/label><select class=\"vc-select\" id=\"vc-mode\"><option value=\"\">Select\u2026<\/option><option value=\"screen\">Arithmetic screening only \u2014 no fault diagnosis<\/option><\/select><\/div><div class=\"vc-field vc-wide\"><label class=\"vc-label\" for=\"vc-source\">Source for candidate band, natural frequency and acceptance tolerances<\/label><input class=\"vc-input\" id=\"vc-source\" maxlength=\"1600\" placeholder=\"OEM analysis, validated model, test report or site procedure; include revision\"><\/div><div class=\"vc-field vc-wide\"><label class=\"vc-label\" for=\"vc-evidence\">Measurement evidence and configuration<\/label><input class=\"vc-input\" id=\"vc-evidence\" maxlength=\"1800\" placeholder=\"asset\/run, bearing design and clearance basis, load, lubricant\/temperature, sensor\/location\/direction, spectrum settings, phase\/orbit\/precession\"><\/div><\/div><p class=\"vc-error\" id=\"vc-error\" role=\"alert\"><\/p><div class=\"vc-warning\"><strong>Diagnostic boundary:<\/strong> a computed fractional-order line is not a defect frequency and cannot by itself prove oil whirl, oil whip, rub, looseness, misalignment or unbalance. Confirm repeatability, forward precession\/orbit and phase where available, speed tracking or lock-on during run-up\/coast-down, bearing condition, load, clearance, oil properties and the machine model before changing operation.<\/div><\/form><div class=\"vc-results\" id=\"vc-results\" aria-live=\"polite\"><div class=\"vc-rgrid\"><div class=\"vc-r vc-primary\"><div class=\"vc-rl\">Run A shaft \/ measured order<\/div><div class=\"vc-rv\" id=\"vc-r-a\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Entered candidate band at Run A<\/div><div class=\"vc-rv\" id=\"vc-r-band-a\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Run A band comparison<\/div><div class=\"vc-rv\" id=\"vc-r-in-a\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Run B shaft \/ measured order<\/div><div class=\"vc-rv\" id=\"vc-r-b\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Entered candidate band at Run B<\/div><div class=\"vc-rv\" id=\"vc-r-band-b\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Two-speed comparisons<\/div><div class=\"vc-rv\" id=\"vc-r-track\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Natural-frequency proximity<\/div><div class=\"vc-rv\" id=\"vc-r-natural\">\u2014<\/div><\/div><div class=\"vc-r\"><div class=\"vc-rl\">Classification<\/div><div class=\"vc-rv\" id=\"vc-r-class\">\u2014<\/div><\/div><\/div><p class=\"vc-note\" id=\"vc-note\"><\/p><\/div><\/div>\n<div class=\"vc-section vc-open\"><button type=\"button\" class=\"vc-toggle\" aria-expanded=\"true\">Equations, evidence and limitations<\/button><div class=\"vc-body\"><div class=\"vc-inner\"><h3>Arithmetic performed<\/h3><div class=\"vc-table-wrap\"><table class=\"vc-table\"><thead><tr><th>Quantity<\/th><th>Equation<\/th><th>Meaning<\/th><\/tr><\/thead><tbody><tr><td>Shaft frequency<\/td><td class=\"vc-code\">f<sub>shaft<\/sub> = n \/ 60<\/td><td><em>n<\/em> in r\/min; result in Hz.<\/td><\/tr><tr><td>Measured order<\/td><td class=\"vc-code\">r = f<sub>meas<\/sub> \/ f<sub>shaft<\/sub><\/td><td>Dimensionless. A line below 1\u00d7 is sub-synchronous.<\/td><\/tr><tr><td>User-documented band<\/td><td class=\"vc-code\">[r<sub>lo<\/sub>f<sub>shaft<\/sub>, r<sub>hi<\/sub>f<sub>shaft<\/sub>]<\/td><td>Only the entered source-specific order limits are projected.<\/td><\/tr><tr><td>Constant-order prediction<\/td><td class=\"vc-code\">f<sub>B,pred<\/sub> = f<sub>A<\/sub>(n<sub>B<\/sub>\/n<sub>A<\/sub>)<\/td><td>Comparison model for an order that tracks shaft speed.<\/td><\/tr><tr><td>Tracking residual<\/td><td class=\"vc-code\">100|f<sub>B<\/sub>\u2212f<sub>B,pred<\/sub>| \/ f<sub>B,pred<\/sub><\/td><td>No universal pass\/fail threshold is applied.<\/td><\/tr><tr><td>Fixed-frequency change<\/td><td class=\"vc-code\">100|f<sub>B<\/sub>\u2212f<sub>A<\/sub>| \/ f<sub>A<\/sub><\/td><td>Comparison with a stationary line; not proof of lock-on.<\/td><\/tr><tr><td>Natural-frequency proximity<\/td><td class=\"vc-code\">100|f<sub>meas<\/sub>\u2212f<sub>n<\/sub>| \/ f<sub>n<\/sub><\/td><td>Reported only when a documented natural frequency is supplied.<\/td><\/tr><\/tbody><\/table><\/div><h3>Why the former automatic frequencies were removed<\/h3><p>The old page generated a fixed 0.42\u20130.48\u00d7 band from speed, labelled it an oil-whirl range and attached generic diagnoses to 0.5\u00d7, 1\u00d7 and 2\u00d7. Those labels were not consequences of the arithmetic. Historical NASA material reports ranges such as 0.35\u20130.48\u00d7 in a training context, while classic rotor-bearing analyses describe a forward-precessional component close to one-half speed and show that load, bearing design and supply\/pressurization can change the ratio substantially. Therefore this worksheet has no default ratio and never calls a calculated line a defect frequency.<\/p><h3>Standards and source scope<\/h3><p><a href=\"https:\/\/www.iso.org\/standard\/68128.html\" target=\"_blank\" rel=\"noopener\">ISO 13373-2:2016, edition 2<\/a> is Published and under systematic review; it covers processing, analysis and presentation of vibration data, including time\/frequency-domain and operational-change analysis. <a href=\"https:\/\/www.iso.org\/standard\/40840.html\" target=\"_blank\" rel=\"noopener\">ISO 13373-3:2015, edition 1<\/a> is Published and was confirmed in 2026; it gives general diagnostic procedures. <a href=\"https:\/\/www.iso.org\/standard\/62201.html\" target=\"_blank\" rel=\"noopener\">ISO 13373-4:2021, edition 1<\/a> covers diagnostic techniques for gas and steam turbines with fluid-film bearings and explicitly notes that actions depend on circumstances, confidence and safety. None of these official scope pages publishes a universal oil-whirl order band or a speed-only diagnosis.<\/p><p>Engineering background: NASA&#8217;s public <a href=\"https:\/\/ntrs.nasa.gov\/api\/citations\/19860020701\/downloads\/19860020701.pdf\" target=\"_blank\" rel=\"noopener\">Whirl and Whip \u2014 Rotor\/Bearing Stability Problems<\/a> discusses forward fractional-frequency whirl and speed-tracking\/whip behaviour; <a href=\"https:\/\/ntrs.nasa.gov\/api\/citations\/20130012715\/downloads\/20130012715.pdf\" target=\"_blank\" rel=\"noopener\">Vibration Diagnostic Guide<\/a> gives contextual 35\u201348% observations; and <a href=\"https:\/\/ntrs.nasa.gov\/api\/citations\/19690003925\/downloads\/19690003925.pdf?attachment=true\" target=\"_blank\" rel=\"noopener\">NASA TN D-4934<\/a> warns that externally pressurized bearings can differ considerably from the near-half-speed self-acting case. These are engineering references, not current normative acceptance limits.<\/p><h3>Required diagnostic evidence<\/h3><p>Use synchronized speed and spectra over more than one operating point; inspect direction\/precession, orbit and phase where instrumentation permits; confirm sensor location, bandwidth, resolution and units; review bearing geometry, radial-versus-diametral clearance convention, load, alignment, lubricant viscosity at operating temperature and system natural frequencies. Apply only thresholds documented for the actual machine and procedure. The exact diagnostic clauses and acceptance limits remain <strong>NEEDS_LICENSED_SOURCE<\/strong>.<\/p><\/div><\/div><\/div><footer class=\"vc-footer\">\u00a9 2024\u20132026 <a href=\"https:\/\/vibromera.eu\/\">Vibromera<\/a> \u00b7 Scientific review July 2026<\/footer><\/div>\n<script>(function(){'use strict';function $(i){return document.getElementById(i)}function num(s){s=String(s).trim();if(!s||!\/^[+]?(?:\\d+(?:[.,]\\d*)?|[.,]\\d+)(?:[eE][+-]?\\d+)?$\/.test(s)||(\/[.,]\/.test(s)&&s.includes('.')&&s.includes(',')))return NaN;return Number(s.replace(',','.'))}function fmt(x,d){return Number(x).toLocaleString(undefined,{maximumFractionDigits:d,minimumFractionDigits:d})}function clear(){['vc-r-a','vc-r-band-a','vc-r-in-a','vc-r-b','vc-r-band-b','vc-r-track','vc-r-natural','vc-r-class'].forEach(function(i){$(i).textContent='\u2014'});$('vc-note').textContent='';$('vc-results').classList.remove('vc-visible')}function fail(m){clear();$('vc-error').textContent=m}function calc(){var fields=['vc-rpm-a','vc-f-a','vc-low','vc-high'],started=fields.some(function(i){return $(i).value.trim()})||$('vc-rpm-b').value.trim()||$('vc-f-b').value.trim()||$('vc-fn').value.trim()||$('vc-source').value.trim()||$('vc-evidence').value.trim()||$('vc-mode').value;if(!started){$('vc-error').textContent='';clear();return}var rpmA=num($('vc-rpm-a').value),fA=num($('vc-f-a').value),lo=num($('vc-low').value),hi=num($('vc-high').value),rb=$('vc-rpm-b').value.trim(),fb=$('vc-f-b').value.trim(),nb=rb!==''||fb!=='',rpmB=num(rb),fB=num(fb),fnRaw=$('vc-fn').value.trim(),fn=num(fnRaw),source=$('vc-source').value.trim(),evidence=$('vc-evidence').value.trim(),mode=$('vc-mode').value;if(!(rpmA>0)||!(fA>0)||!(lo>0)||!(hi>0)||lo>=hi||hi>=1){fail('Enter positive Run A values and a documented order band with 0 < lower < upper < 1.');return}var shaftA=rpmA\/60;if(!(fA<shaftA)){fail('Run A measured line must be below the shaft frequency for this sub-synchronous worksheet.');return}if(nb&&(!(rpmB>0)||!(fB>0)||!(fB<rpmB\/60)||rpmB===rpmA)){fail('For Run B enter both positive values, a sub-synchronous line, and a shaft speed different from Run A.');return}if(fnRaw!==''&&!(fn>0)){fail('Natural frequency must be positive or blank.');return}if(!source||!evidence||mode!=='screen'){fail('Complete the source, measurement\/configuration evidence and select the arithmetic-only boundary.');return}var orderA=fA\/shaftA,aLo=lo*shaftA,aHi=hi*shaftA,inA=orderA>=lo&&orderA<=hi;$('vc-error').textContent='';$('vc-r-a').textContent=fmt(shaftA,4)+' Hz \/ '+fmt(orderA,5)+'\u00d7';$('vc-r-band-a').textContent=fmt(aLo,4)+'\u2013'+fmt(aHi,4)+' Hz';$('vc-r-in-a').textContent=inA?'Inside entered band \u2014 not a diagnosis':'Outside entered band \u2014 not an exclusion';$('vc-r-class').textContent='Arithmetic screening only';if(nb){var shaftB=rpmB\/60,orderB=fB\/shaftB,bLo=lo*shaftB,bHi=hi*shaftB,pred=fA*(rpmB\/rpmA),track=100*Math.abs(fB-pred)\/pred,fixed=100*Math.abs(fB-fA)\/fA,inB=orderB>=lo&&orderB<=hi;$('vc-r-b').textContent=fmt(shaftB,4)+' Hz \/ '+fmt(orderB,5)+'\u00d7';$('vc-r-band-b').textContent=fmt(bLo,4)+'\u2013'+fmt(bHi,4)+' Hz; '+(inB?'inside':'outside')+' entered band';$('vc-r-track').textContent='constant-order prediction '+fmt(pred,4)+' Hz; residual '+fmt(track,3)+'%; fixed-frequency change '+fmt(fixed,3)+'%'}else{$('vc-r-b').textContent='Not entered';$('vc-r-band-b').textContent='Not calculated';$('vc-r-track').textContent='Enter a second operating point'}if(fnRaw!==''){$('vc-r-natural').textContent='Run A '+fmt(100*Math.abs(fA-fn)\/fn,3)+'%'+(nb?'; Run B '+fmt(100*Math.abs(fB-fn)\/fn,3)+'%':'')+' from entered f\u2099'}else $('vc-r-natural').textContent='No documented f\u2099 entered';$('vc-note').textContent='Candidate-band source: '+source+' | Measurement\/configuration evidence: '+evidence+'. Compare the residuals only with tolerances from that source; no universal threshold or automatic oil-whirl\/oil-whip classification is applied.';$('vc-results').classList.add('vc-visible')}$('vc-form').addEventListener('input',calc);$('vc-form').addEventListener('change',calc);document.querySelectorAll('.vc-toggle').forEach(function(b){b.addEventListener('click',function(){var s=this.closest('.vc-section');s.classList.toggle('vc-open');this.setAttribute('aria-expanded',s.classList.contains('vc-open'))})});calc()})();<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Darmowy kalkulator online do pomiaru cz\u0119stotliwo\u015bci uszkodze\u0144 \u0142o\u017cysk \u015blizgowych. Oblicz zakres cz\u0119stotliwo\u015bci wirowania oleju, cz\u0119stotliwo\u015b\u0107 uderze\u0144 oleju, cz\u0119stotliwo\u015b\u0107 wa\u0142u oraz wska\u017aniki drga\u0144 subsynchronicznych.<\/p>","protected":false},"featured_media":0,"template":"","meta":{"ai_generated_summary":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-100141","calculator","type-calculator","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/calculator\/100141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/calculator"}],"about":[{"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/types\/calculator"}],"version-history":[{"count":2,"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/calculator\/100141\/revisions"}],"predecessor-version":[{"id":102463,"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/calculator\/100141\/revisions\/102463"}],"wp:attachment":[{"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/media?parent=100141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/categories?post=100141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vibromera.eu\/pl\/wp-json\/wp\/v2\/tags?post=100141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}