Tools
Engineering rekentools
De werkende rekentools van de originele site, overgezet zodat ze in elke moderne browser draaien. De berekening is een letterlijke overzetting van de originele JavaScript en wordt tegen de originele uitkomst gecontroleerd voordat een rekentool als gevalideerd wordt gemarkeerd.
Gas- & aerostatische lagers
Aerostatic thrust bearing — simple orifice restrictorLoad capacity, stiffness, mass flow and orifice sizing for an aerostatic thrust bearing with a simple orifice restrictor. Unlocked from the legacy demo gate; general in its geometry.Aerostatic shallow-pocket thrust bearingLoad capacity, stiffness and flow for an aerostatic shallow-pocket thrust bearing, from the pocket and land pressure profiles. Unlocked from the legacy demo gate; general in its geometry.Aerostatic bearing — grouped inherent orificesDesign pressure ratio and load capacity for an aerostatic thrust bearing fed through grouped inherent orifices.Aerostatic thrust bearing, simple orifice restrictor — fixed reference geometry (A)Reference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 pressure ratio — fixed, matching the original) for an aerostatic thrust bearing with a simple orifice restrictor. Vary feed diameter, pressures and discharge coefficient.Aerostatic thrust bearing, simple orifice restrictor with slot-flow check — fixed reference geometry (B)Reference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for an aerostatic thrust bearing with a simple orifice restrictor, including a supply-slot vs. choked-flow area check (A3/A3c).Air bearing, porous surface feed — fixed reference geometryReference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for an aerostatic thrust bearing fed through a porous surface (permeability-coefficient restriction).Air bearing, slot feeding — fixed reference geometryReference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for an aerostatic thrust bearing fed through an annular slot with nr discrete orifices.Thrust-collar air bearing, orifice/slot — fixed reference geometry (A)Reference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for a thrust-collar aerostatic bearing with an outer feed zone and an inner vacuum/exhaust zone.Thrust-collar air bearing, orifice/slot — fixed reference geometry (B)Reference-geometry calculator (Ø40mm outer diameter, 5µm film, β=0.6 — fixed) for a thrust-collar aerostatic bearing fed through a slot of nr discrete orifices, with an inner vacuum/exhaust zone and a supply choked-flow check.Uitwendig van druk voorzien gaslager met gedeeltelijk gegroefd oppervlakBerekening van gaslagers, luchtlagersUitwendig van druk voorzien gaslager met gedeeltelijk gegroefd oppervlakBerekening van gaslagers, luchtlagersAerostatic slim air bearing — groove-compensated circular thrust bearingLoad capacity, stiffness, mass flow and volume flow for a circular groove-compensated aerostatic thrust bearing (modeled on the slimairbearings.eu product family).Berekening van aerostatische lagersOntwerp en berekening van gaslagers, luchtlagersOntwerp en berekening van gaslagersLoad, stiffness, restrictor gap and gas flow for an aerostatic radial (journal) gas bearing, using the porous/groove-feed design correlation for L/D ratios from ~0.25 up.Gedeeltelijk gegroefd radiaal luchtlagerEccentric load capacity and gas mass flow for a partially grooved (symmetric) radial aerostatic bearing, integrated over the groove pattern around the bearing.New Way porous air bearing — flat roundCatalog performance data (load, stiffness, flow, mass) for New Way flat round porous-carbon air bearings, by diameter, at the vendor-fixed 60 psi supply and 5 µm fly height.New Way porous air bearing — bushing (sleeve)Catalog performance data (max load, radial stiffness, flow, mass, dimensions) for New Way porous-carbon air bearing bushings (radial sleeves), by bore diameter, at the vendor-fixed 60 psi supply and 4 µm air gap.Berekening van udv luchtlagersLoad, stiffness, restrictor gap and gas flow for an externally pressurized aerostatic thrust bearing fed through a porous annular ring.Stromingsweerstand persluchtslangPressure drop along a compressed-air supply hose/line for a given flow rate, length and inner diameter — for sizing the air supply feeding an aerostatic bearing.
Spiraalgroeflagers
Spiral-groove bearing (axial)Axial load capacity, stiffness, friction torque and power loss for a spiral-groove thrust bearing — a specialist calculation with essentially no free equivalent anywhere.Ontwerp en berekening van axiale spiraalgroeflagersOperating speed, friction torque and power loss for an axial spiral-groove thrust bearing carrying a given load, from the groove geometry and film thickness.Ontwerp en berekening van axiale spiraalgroeflagers, herringbone profielOperating speed, friction torque and power loss for a herringbone-profile spiral-groove thrust bearing carrying a given load.
Hydrostatische lagers
Hydrostatische lagers met wigvormige film of ondiepe kamerBerekening van de draagkracht en stijfheidHydrostatische lagers met wigvormige film of ondiepe kamerBerekening van de draagkracht en stijfheidBerekening van hydrostatische lagersHydrostatische lagers van de Prins Willem Alexander SluisHydrostatisch radiaal lager, uitwendig van druk voorzien radiaal lagerBerekening van de draagkracht en stijfheidGedeeltelijk gegroefd hydrostatisch lagerUitwendig van druk voorzien lager, u.d.v. lagers met gedeeltelijk gegroefd oppervlak
EHL & filmdikte
EHL line contact — film thicknessCentral film thickness of an elastohydrodynamic line contact from the Moes dimensionless load/lubrication groups, with contact half-width and Hertzian pressures.Smering bij het draadtrekken, berekening van de hydrodynamische drukopbouw en filmdikteLubricant film thickness and drawing stress between wire and die, from area reduction, die angle, speed and lubricant properties.Smering bij het plaatwalsen, berekening van de hydrodynamische filmdikteLubricant film thickness, contact length and roll force between the work rolls and the sheet, from the reduction ratio and lubricant properties.Elastohydrodynamische smering in groefkogellagers, berekening van de filmdikteElastohydrodynamic film thickness, contact ellipse and pressure for a grooved ball bearing, using the Hamrock-Dowson regression.Berekening van de filmdikte in een EHL puntcontactElastohydrodynamic film thickness, contact ellipse and pressure for a general elliptical point contact, from directly specified load and entrainment speed.
Lagers (algemeen)
Berekening van een boltaats, belastbaarheid en wrijvingskoppelHertz contact druk / plastische deformatieKantelblokjeslager, Berekening van een rechthoekig kantelblokjeLoad capacity, friction coefficient and film-thickness/eccentricity numbers for a rectangular Michell tilting-pad bearing, sized as a compromise between minimum friction and maximum film thickness.Hydrodynamic journal bearingSommerfeld number, attitude angle, friction, load capacity, stiffness, side leakage and frictional heating for a finite-length hydrodynamic journal bearing. Unlocked from the legacy demo gate; general in shaft diameter, clearance and film thickness.Hydrodynamisch lager met stootbelastingDimensionless and dimensional impulse capacity of a finite-length hydrodynamic journal bearing (π-film boundary condition) subjected to a shock/impact load.Ontwerp van een hydrodynamisch gesmeerd glijlagerSommerfeld number, attitude angle, friction and flow numbers, plus load capacity, friction coefficient and lubricant flow for a hydrodynamically lubricated plain (journal) bearing, from length ratio, eccentricity, clearance ratio, radius, speed and viscosity.Journal bearing — oil flow / pressure dropPressure drop across a journal bearing film needed to produce a prescribed axial (cooling) flow rate, from shaft diameter, bearing length, radial clearance, eccentricity and viscosity.Static load capacity of polymer (thermoplastic) bearingsElastic indentation, contact geometry, load capacity and stiffness of a thermoplastic sliding bearing bush from shaft diameter, bearing length, wall thickness, modulus of elasticity, radial clearance and allowable contact pressure.Load capacity and stiffness of guide ringsContact geometry, load capacity and stiffness of a resilient thermoplastic guide (wear) ring supporting a piston/rod, from piston diameter, ring width/thickness, elastic indentation, radial clearance and modulus of elasticity. Unlocked from the legacy demo gate; general in shaft diameter and indentation.Berekening van het statisch draaggetal van een groefkogellagerCalculator voor statisch draaggetal van een groefkogellager gebaseerd op Hertz theorie.Wrijving in kogelkooi geleidingStijfheid, draagkracht, wrijvingscoefficient, rechtgeleiding
Slijtage
Specific wear rate (pin-on-disk)Specific wear rate from a pin-on-disk test, derived from the worn volume, normal load and sliding distance (Archard-type wear coefficient).Slijtage berekening kogel op schijf contact, nominaal puntcontactKogel op schijfSlijtageberekening nominaal lijncontactBlok op schijf, pen op schijfGlijlager slijtage berekeningLagerslijtage, levensduurberekeningBerekening van de toelaatbare belasting van plastic glijlagersdynamische belastbaarheid, LPV waarde, pv-waarde, toelaatbare vlaktedruk en glijsnelheid, warmteontwikkelingSpecific wear rate, nominal point contact (three methods)Archard specific wear rate for a point-contact (pin-on-disk) wear scar, computed three independent ways: from scar diameter+depth, from wear depth+pressure+velocity+time, or from mass loss+density.Specific wear rate, nominal line contact — from ring radius and scar widthArchard specific wear rate for a line-contact (pin-on-ring) wear scar, computed from the ring radius and semi scar width, deriving the scar depth from circular-segment geometry.Specific wear rate, nominal line contact — from scar depth and widthArchard specific wear rate for a line-contact (pin-on-ring) wear scar, computed from the scar depth and semi scar width, deriving the ring radius algebraically.Contacttemperatuur berekening, flitstemperatuurBulk and flash frictional contact temperature rise for a pin-on-disk sliding contact, from normal load, sliding velocity, friction coefficient, pin geometry (radius, length) and material properties.Berekening van de contact temperatuur, T-maps AshbyFlits temperatuur, Bulk temperatuure
Contactmechanica (Hertz)
Hertz punt contactBerekening van de contactdruk en afmetingen in een punt contactHertz elliptisch contactBereken de contactdruk en afmetingen in een elliptisch contactHertz elliptisch contactContact semi-axes, mean and maximum contact pressure for two bodies in elliptical contact — same formula as the "Hertz elliptical contact" calculator, but returning unrounded, full-precision results as the original e2_7 page does.Hertz lijncontactBereken de contactdruk en afmetingenHertz lijncontact, berekening van de contactdruk en afmetingenSemi contact width, mean and maximum contact pressure for a cylindrical body in line contact (optionally against a concave/conforming counter-surface), under a prescribed load per unit length (Hertz theory).Hertz initial point contact — load from prescribed contact pressureFor a ball on a flat, computes the effective modulus, effective radius, initial contact diameter, indentation and contact load corresponding to a prescribed mean contact pressure (e.g. the onset of yield, pmc = Rp0.2).Rollen met tractieCalculator voor tractie mechanismen, puntcontact Hertz, gecombineerd rollen met tangentiaalkrachtRollen met tractieCalculator voor tractie mechanismen, lijncontact
Bouten, schroefdraad & bevestigingen
Berekening van het aanhaalmoment om een bout voor te spannen, voorspanboutTightening torque to reach the preload of a metric bolt, with the induced torsional/equivalent stress and the bolt-force reserve — from ISO thread geometry and the strength class.Maximum dynamic load on a preloaded metric boltMaximum fatigue (dynamic) load capacity of a preloaded metric bolted joint, from thread size, property class and joint stiffness.Berekening maximum aanhaalmoment om een boutverbinding voor te spannenTightening torque (thread + head friction), resulting preload and stress relaxation for a metric bolted joint tightened to a prescribed equivalent stress.tapgat, draadlengte, afschuifsterkte, schroefdraadlengte, berekeningShear (stripping) strength of a metric thread engagement, from the effective thread length and allowable shear stress.Berekening bandtransporteur, benodigde bandspanning en voorspankrachtBelt length, wrap angle, belt tensions and resulting shaft load for a flat belt drive.Berekening maximum trekkracht in een boutPreload and load reserve for a metric bolt tightened to a prescribed tensile stress (fraction of yield strength).UNC fastener in tensionThread geometry, SAE proof strength and initial preload for a UNC fastener under tension.Tightening torque to preload a UNC boltTightening torque (thread + head friction), preload and equivalent stress for a UNC bolt (SAE grade system, US customary units).UNF fastener in tensionThread geometry, SAE proof strength and initial preload for a UNF fastener under tension.Tightening torque to preload a UNF boltTightening torque (thread + head friction), preload and equivalent stress for a UNF bolt (SAE grade system, US customary units).Flat (parallel) key designOntwerp van spieverbindingen
Mechanische verbindingen
Vermoeiingssterkte schoefverbindingLoad-fatigue limit of a bolted joint (M12 thread — fixed, matching the original locked demo) from property class, joint stiffness factor and minimum clamping force.Kracht-rek diagram van een schoefverbinding, berekening maximum bedrijfslast, spanningsdiagramPreload, stiffness-based load split and maximum permissible operating load for a preloaded metric bolted joint, from thread size, property class, preload fraction and joint stiffness factor.Schroefverbinding - StijfheidsverhoudingBolt stiffness, an assumed pressure-cone stiffness of the clamped material, and the resulting joint stiffness factor Cₘ=kᵦ/(kᵦ+kₘ) used elsewhere in bolted-joint load-sharing calculations.LijmverbindingMaximum shear force and transmissible torque for an adhesive slip-fit joint of a shaft in a bore, from bond diameter, length and adhesive shear strength.KlembusMean contact pressure, friction force and maximum transmissible torque for a clamping bushing on a shaft, from bore diameter, clamped length, clamping force and coefficient of friction.PenverbindingCilindrische pen op afschuiving, borging, torsie, borgpenAdhesive lap joint — shear stress distribution (Goland & Reissner)Minimum and maximum adhesive shear stress across a bonded lap joint (Goland & Reissner model), from plate thickness/stiffness, adhesive thickness/shear modulus, load per unit width and overlap length.
Pers- & krimpverbindingen
Berekening van een perspassingOntwerp van een persverbindingPerspassing tolerantie calculatorPassing volgens DIN ISO 286: 1990Interference fit — pressure, force, torque and assembly temperatureContact pressure, friction force/torque and stresses for an interference fit (Lame equations), plus the cooling/heating temperature needed for expansion/shrink-fit assembly.Berekening van een perspassingOntwerp van een persverbindingBerekening perspassing van dunwandige buisContact pressure, mounting/friction force and transmission torque for a press fit of a thin-walled tube, from the tube’s hoop (tensile) stress at assembly.Cone-type shaft-hub interference fit — fixed 20mm mean diameterInterference, contact pressure, friction force, axial force and transmission torque for a cone-type shaft-hub connection (Lame equations), with the mean diameter fixed at 20mm as in the original locked demo page.
As- & vermoeiingssterkte
Aandrijfassen dynamisch belastCalculator, vermoeiingssterkte, belastingvermoeiingsgrens, getrapte as, gegroefde as, as groef, schouder as, cilindrischDrive shaft fatigue strength in bendingMaximum static and cyclic bending moment for a drive shaft at a critical, notched cross-section, from tensile strength and stress concentration factor.Drive shaft torsional stress and stiffnesscalculator torsiespanning aandrijfas, hol, holle aandrijfas, polair kwadratisch oppervlaktemoment, berekeningDraagascalculator buigspanning draagas, hol, holle aandrijfas, berekeningDrive shaft under combined bending and torsioncalculator gecombineerd buiging + torsie, wringing, hol, holle aandrijfas, berekeningDrive shaft fatigue strength with a keywayStandard key cross-section for a given shaft diameter, and the fatigue strength (static and cyclic torque limit) of the shaft at the keyway root.Vertande as verbindingAsvertanding, torsiemoment, torsiespanning
Spanningsconcentratie
Shaft diameter for a grooved shaft in bending (given Kt)Sizes the diameters of a grooved/shouldered shaft in bending from the applied bending moment, yield strength, target endurance ratio and a prescribed geometric stress concentration factor Kt.Geometric stress concentration for a shaft with shoulder fillet in torsionGeometric stress concentration factor Kt = A(r/d)^b for a stepped shaft with a shoulder fillet loaded in torsion, from chart-fit coefficients A, b keyed on the D/d ratio.Geometric stress concentration for a shaft with shoulder fillet in bendingGeometric stress concentration factor Kt = A(r/d)^b for a stepped shaft with a shoulder fillet loaded in bending, from chart-fit coefficients A, b keyed on the D/d ratio.Geometric stress concentration for a shaft with a transverse hole in torsionGeometric stress concentration factors for a shaft with a transverse (drilled) hole loaded in torsion — on the shaft surface at the hole (KtA) and below the surface inside the hole (KtB) — from independent polynomial fits in the hole/shaft diameter ratio d/D.Geometric stress concentration for a shaft with a transverse hole in bendingGeometric stress concentration factor on the surface of a shaft with a transverse (drilled) hole loaded in bending, from a log10 curve fit in the hole/shaft diameter ratio d/D.Geometric stress concentration for a grooved shaft in tensionGeometric stress concentration factor Kt = A(r/d)^b for a grooved shaft loaded in tension, from chart-fit coefficients A, b keyed on the D/d ratio (r/d clamped to 0.1 above its 0.3 validity limit, as in the legacy page).Geometric stress concentration for a grooved shaft in bendingGeometric stress concentration factor Kt = A(r/d)^b for a grooved shaft loaded in bending, from chart-fit coefficients A, b keyed on the D/d ratio (r/d clamped to 0.1 above its 0.3 validity limit, as in the legacy page).Geometric stress concentration for a grooved shaft in torsionGeometric stress concentration factor Kt = A(r/d)^b for a grooved shaft loaded in torsion, from chart-fit coefficients A, b keyed on the D/d ratio (r/d clamped to 0.1 above its 0.3 validity limit, as in the legacy page).
Tandwielen (ISO 6336)
Tandwielberekening, tandflanksterkte volgens ISO 6336-1, vermoeiiingssterkte voor pitting, vermoeiingslevensduur van de tandflankMaximum tangential force and drive torque for a spur/helical gear pair from permissible flank (contact) stress, per ISO 6336-1/-2.Tandwielberekening, tandvoetspanning volgens ISO 6336Maximum tangential force and drive torque for a spur/helical gear pair from permissible tooth-root bending stress, per ISO 6336-1/-3.Gear flank load factor, K_H,tot — ISO 6336-2Total load factor σ_H/σ_H0 = (K_A·K_v·K_Hα·K_Hβ)^½ used in the ISO 6336-2 flank (pitting) strength calculation.Gear flank permissible-stress factor, K_C,tot — ISO 6336-2Total correction factor σ_HP/σ_H,lim = (Z_NT·Z_L·Z_v·Z_R·Z_w·Z_x)/S_H for the permissible flank (contact) stress in the ISO 6336-2 pitting calculation.Gear tooth-root load factor, K_F,tot — ISO 6336-3Total load factor σ_F/σ_F0 = K_A·K_v·K_Fα·K_Fβ used in the ISO 6336-3 tooth-root bending strength calculation.Gear tooth-root permissible-stress factor, K_S,tot — ISO 6336-3Total correction factor σ_FP/σ_F,lim = (Y_ST·Y_NT·Y_δ·Y_R·Y_X)/S_F for the permissible tooth-root bending stress in the ISO 6336-3 calculation.
Veren & flexures
Calculator voor gatscharnierenOntwerpgrafiek voor gatscharnieren, torsiestijfheid, axiale stijfheidCalculator voor kruisscharnierenTorsional stiffness of a cross-spring (leaf-spring) flexure hinge from plate-spring geometry and the crossing-angle ratio.Compression / tension spring (A)Deflection, stiffness, shear stress and stored energy of a helical compression/tension spring, from wire diameter, coil diameter, number of coils and shear modulus.Compression / tension spring (B)Deflection, stiffness and shear stress of a helical compression/tension spring, using an alternative coefficient set to compression-tension-spring-a.Conical springDeflection, stiffness and shear stress of a helical conical (tapered-coil) spring, from wire diameter and top/bottom mean coil diameters.Torsion spring (coiled)Bending stress, angular deflection, stiffness and stored energy of a coiled helical torsion spring, loaded by a force at a lever arm.Torsion spring (bar)Bending stress, angular deflection and stiffness of a straight torsion-bar spring, from wire diameter, lever arm and effective spring length.Disc (Belleville washer) springStress, deflection and stiffness of a Belleville disc spring, from outer/inner diameter, thickness and material properties.Torsion bar (solid, round)Polar moment of inertia, shear stress, angular deflection and torsional stiffness of a solid round torsion bar.Torsion bar (hollow, round)Polar moment of inertia, shear stress, angular deflection and torsional stiffness of a hollow round torsion bar.Leaf spring (cantilever)Bending moment, stress, deflection, end slope and stiffness of a cantilever leaf spring under an end load.Tension bar (rod spring)Cross-section area, tensile stress, axial deflection and stiffness of a cylindrical bar loaded in tension, acting as a simple rod spring.
Smeermiddel & viscositeit
Shell vierkogelapparaat voor het testen van smeermiddelen, EP additievenBulk and flash contact temperature rise in a Shell four-ball lubricant/EP-additive tester, from load, speed, ball size, friction coefficient and material properties.Roterende concentrische cilinder viscositeitsmeterCilinder viscositeitsmeter, Berekening van het wrijvingskoppel versus viscositeit, cilindrische spindel, disc spindle, brookfieldCone on plate viscositeitmeterCone on plate viscometer, berekening van het wrijvingskoppel versus viscositeit, brookfield cap viscometers, models cap 1000 and cap 2000, cone and plate geometryViscositeit-Temperatuur relatieReynolds, Vogel & Cameron, dynamische viscositeitViscositeit-Temperatuur relatieReynolds, dynamische viscositeitViscosity Index — ISO 2909 / ASTM D2270 (reference case)Viscosity Index (VI) and its two inverse forms (kinematic viscosity at 100°C, or at 40°C) for one worked reference oil (40°C/68 cSt, 100°C/8.6 cSt, VI=97). The original page never ships the VI formula client-side — only this login-gated worked example, in three directions.Viscositeit Index (VI)ISO 2909 / ASTM D2270-226, calculation, calculator, viscositeitsindexBasis olie mengselsKinematische viscositeit, basis olie mengselViscositeit-drukafhankelijkheid van smeermiddelenBarus, Roelands, Calculator, Piezo effect, olie
Trillingen & demping
Viscous damping, solid piston in a cylindrical boreDamping constant of a solid (bore-less) piston sliding in a viscous-fluid-filled cylinder, given both as pressure-driven (Poiseuille) squeeze flow and as pure Couette drag flow across the radial gap.Viscous damping, capillary-tube (suspension / shock absorber) damperDamping constant and normalised impulse of a piston damper that forces fluid through a thin capillary tube (Hagen-Poiseuille flow), as used in suspension and shock absorbers.Viscous damping, annular (bored) pistonDamping constant and normalised impulse of an annular piston (outer radius R₀ over an inner bore/rod R₁) sliding concentrically through a viscous-fluid-filled radial gap.Viscous annular damper, impact (shock) responseStopping stroke, peak piston force and peak hydrostatic pressure of an annular viscous damper (outer radius R₀, inner radius R₁, gap h₀) when a mass enters at a given impact velocity, including a relative-eccentricity correction.Viscous damper, steady-state harmonic (sinusoidal) responseSteady-state sinusoidal force/velocity/displacement amplitudes of a pure viscous damper of known damping constant C at a given frequency f — either from a known displacement amplitude or from a known force amplitude.
Krachtoverbrenging
Berekening TrapeziumdraadBerekening schroefdraadvijzel, trapezium draad, levensduur, schoefdraadrendement, vlaktedruk schoefdraadflank, contactdrukPower screw — torque, safety factor and service lifeForward/back-drive friction torque, screw efficiency, thread contact pressure, safety factor and sliding-wear service life of a trapezoidal power screw, from thread size, material grade, axial load, friction and nut geometry.Van Doorne's metalen duwbandTransmission ratio, belt speed/length, wrap angle, drive torque and force, belt-strand tensions and resulting shaft load for a metal V-belt (Van Doorne push-belt / CVT) drive between two pulleys.Berekening V-riem overbrengingTransmission ratio, belt speed and length, wrap angle, drive force, belt tensions T1/T2 and resulting shaft load for a V-belt drive, from power, speed, pulley diameters, center distance and groove angle.
Constructie
Fillet weld under static loadResultant forces, weld-throat shear/normal stresses and the equivalent stress for a statically loaded fillet weld under an eccentric, angled load (single- or double-sided weld).Stresses in cylinders, vessels and pipes (Lame)Tangential (hoop) and von Mises equivalent stresses at the inner and outer surfaces, and diametric expansion, of an open-ended thick-walled cylinder under internal pressure only, from Lame's equations.Lasberekening dynamisch belast, Eurocode 3 prEN 1993-1-9Constant-amplitude fatigue limit, cut-off limit, S-N slope exponent and fatigue life of a dynamically loaded weld detail, from its Eurocode 3 detail category (FAT class) and applied stress range.Buckling limit of compression-loaded columnsEuler buckling load, axial stiffness, cross-section area and second moment of area for a hollow circular column, for four standard end-condition (buckling mode) cases.Buckling limit of S-shaped beams (wire springs)Longitudinal and lateral stiffness, bending stress and buckling load for an S-shaped (reinforced mid-section) wire spring/beam, for two beam-type configurations.
Afdichtingen
Mechanische afdichtingen, asafdichting, axiale afdichtingContact pressure on the seal face, leakage flow, friction coefficient and heat generation for an axial (mechanical) shaft seal with a thin parallel lubricating film.Dimensioneren van de groefafmetingen van een dynamische O-ring afdichtingSizes the piston-bore and rod-bore groove geometry (bore/shaft tolerances, groove width, squeeze) for a dynamic O-ring seal from O-ring cross-section, stretch and squeeze.
Betrouwbaarheid & toleranties
Normal distribution: value for a given failure probabilityGiven a mean, standard deviation and target failure probability F(t) = p, returns the corresponding value t.Probability interval from measured dataMean, standard deviation and a probability (tolerance) interval derived from up to 10 measured data points.Probability interval of shaft diameter tolerancesConverts a uniform manufacturing tolerance field into an equivalent normal-distribution tolerance interval at a chosen confidence level.System reliability — series and parallel combinationCombined system reliability for two components, both in series and in parallel.Reliability data conversion — μ, σ → R(t)Converts a mean and standard deviation (normal life distribution) plus a service life into a reliability R(t), by numerical integration of the standard normal density.Motor reliability with two bearingsWeibull-based reliability of each bearing at a given service life (from its L10 life), combined into overall motor reliability.Tolerance chain dimensioningWorst-case, root-sum-square and probabilistic combination of a three-link tolerance chain (B, C, D) at a chosen reliability R.MTBF to R(t) conversionMean time between failure from a test of n specimens over duration T with r failures, and the corresponding reference reliability values.Fault tree analysisSystem reliability from a fault tree of three series blocks (A, B, C) followed by two redundant pairs (D+E, F+G).Operating reliability of a ball bearingEstimated operating reliability of a ball bearing at a given service life, from its L10 life (in revolutions) and rotational speed.Reliability factor for fatigue strengthReliability correction factor for fatigue strength, from the coefficient of variation of the strength and a target reliability.Estimation of system reliability — two parts in seriesReliability of two parts, each with its own normal life distribution (mean, standard deviation), connected in series, at a common service life.Normal distribution percentile calculatorOne-sided or two-sided probability (area under the standard normal curve) for a given t-value.Waarschijnlijkheidsverdeling tolerantie intervalNormaal verdeling, Gausse verdelingLagerspleet tolerantiePerspassing lagerbus, lagerspeling, DIN ISO 286: 1990Estimation of service interval for timing belt replacementBack-calculates the mileage service interval at two prescribed reliability levels from a normally distributed failure mileage (mean and standard deviation), for timing belt replacement scheduling.
Eenheden- & schaalconversie
Conversie van temperatuurschalen celsius, kelvin en fahrenheidConverts a temperature value between the Celsius, Kelvin and Fahrenheit scales.Omzetten van eenheden voor rotatiesnelheid, m/s, rpm, revolutions per minute, revs, aantal omwentelingen per secondeConverts a rotational speed between rpm, surface speed (m/s) and angular velocity (rad/s), using the shaft/pulley diameter to relate the angular and linear representations.General unit converterConverts a value between any two units within one of 21 engineering unit categories (length, mass, force, pressure, energy, power, temperature, viscosity, volume flow, etc.), using the legacy JSUC conversion-factor tables.Hardness conversion of metals (ASTM E 140-97)Converts a hardness value between Vickers, Brinell, Knoop, Rockwell (A/B/C/D), Rockwell superficial (15N/30N/45N) and Scleroscope scales for non-austenitic steels, per ASTM E 140-97 Table 1.