Evidence-based engineering screen

Vibration Mount Candidate Screening Calculator

Evaluate a documented candidate mounting system with the classical linear single-degree-of-freedom model. Enter total dynamic stiffness and damping at the actual evaluation condition. This page does not select, rate or approve a mount.

Classical SDOFDynamic stiffnessDamped transmissibilityNo automatic selection

Important distinctionDynamic stiffness, static stiffness and shock stiffness are not interchangeable for real elastomeric isolators. Static deflection is calculated only when a separate static stiffness is supplied. Use manufacturer or measured properties for the actual preload, axis, amplitude, frequency and temperature.

Candidate and model inputs

Blank defaults are deliberate. Record the actual candidate data; no generic mount, target percentage or equal-load assumption is inserted.

Case or candidate ID

Harmonic configuration

Evaluated translational axis

Total supported mass

Single harmonic excitation frequency

Not a random spectrum, shock pulse or run-up sweep.

Total dynamic stiffness, evaluated axis

Sum the candidate support stiffnesses for this axis at their actual individual loads.

Viscous damping ratio, zetaDimensionless, non-negative, measured or supplied for the same condition.

Separate total static stiffness (optional)

Leave blank rather than substituting dynamic stiffness.

Property source and evaluation condition

Scope evidence

These checks do not approve the mount. They record whether the simplified calculation has enough context to be reviewed.

Condition-specific properties. Dynamic stiffness and damping correspond to the actual preload, direction, amplitude, frequency and temperature. Load distribution. Center of gravity, mount locations and individual reactions are documented; no equal-load assumption is being hidden. SDOF suitability. One translational mode and a linear time-invariant approximation are acceptable for this screen. Support interaction. Foundation or supporting-structure flexibility and coupling have been assessed separately. Other load cases. Startup, shutdown, resonance crossing, shock, travel, sway space, restraint and steady acceleration are checked separately. Candidate capacity. Manufacturer load, deflection, environment, life and installation limits are checked for every support.

Not evaluated

Undamped natural frequency, f_एन–

Frequency ratio, r–

Transmissibility, T–

Classical-model regime–

Supported static force–

Static deflection from separate K_{स्थिर}–

Equations and interpretation

These are classical linear SDOF relations, not formulas issued by ISO 2017-1 or ISO 10846. For total supported mass एम, total directional dynamic stiffness क_dyn, harmonic frequency एफ and viscous damping ratio zeta:

f_n = (1 / 2π) √(K_dyn / m) ; r = f / f_n

T = √(1 + (2ζr)^2) / √((1 – r^2)^2 + (2ζr)^2)

For force excitation, टी is transmitted harmonic force divided by applied harmonic force. For base excitation, the same expression is the absolute motion of the mass divided by base motion in this model. The isolation region begins only above r = √2; damping lowers resonance amplification but increases high-frequency transmissibility.

delta_static = m g / K_static only when a separate applicable K_static is supplied

Published cross-check: Parker LORD catalog PC6116 lists the MAA004-1 candidate at 140 N/mm dynamic axial stiffness, 0.91 kg rated load and 63 Hz natural frequency. The relation above gives approximately 62.4 Hz; the difference is consistent with the rounded catalog data. This is a formula verification example, not a recommendation for that product.

Source and standards boundary

आईडी	स्रोत	Verified public information	Use on this page
S1	ISO 2017-1:2005, Edition 1	Published standard for technical information exchange between users, manufacturers and suppliers when applying isolation systems.	Application-data boundary; not cited as the source of the calculator equations.
S2	ISO 10846-1:2008, Edition 2	Current, confirmed in 2022; principles and guidance for laboratory measurement of vibro-acoustic transfer properties of resilient elements.	Measurement context only.
S3	ISO 10846-3:2002, Edition 1	Current, confirmed in 2022; indirect method for dynamic transfer stiffness of resilient supports under a specified preload.	Reason for requiring condition-specific dynamic stiffness.
S4	Parker LORD PC6116, Vibration & Shock Theory	Classical SDOF relations, selection considerations, load distribution, nonlinear property cautions, and the distinction between static and dynamic stiffness.	Public formula, limitations and product cross-check.

NEEDS_LICENSED_SOURCEThe detailed normative information-exchange fields and laboratory procedures in ISO 2017-1 and ISO 10846 are protected. This page links their official cards but does not reproduce or infer protected clauses, acceptance criteria or test tolerances.

Corrections made in this audit

Target percentage was not a mount-selection method

The former page inverted an undamped transmissibility equation and called the result required stiffness. It did not evaluate an actual part, dynamic property data, capacity, environment, center of gravity or support interaction. Target-isolation presets and automatic selection wording were removed.

Static and dynamic stiffness are now separate

The former page calculated static deflection from its derived dynamic stiffness. Parker LORD explicitly warns that this relation does not hold for real elastomeric vibration/shock isolators. Static deflection now remains unavailable unless separate static stiffness is entered.

Damping and resonance are represented

The former engine was undamped but marketed the result as a mount selection. The candidate screen now uses the damped classical transmissibility equation and identifies amplification, unity transmission or attenuation without issuing a pass/fail decision.

Equal-load division was removed

A mount count alone does not establish individual reactions. The revised input is total directional dynamic stiffness assembled from support properties at their actual loads, with center-of-gravity and reaction documentation required as evidence.

Input and unit integrity was rebuilt

Decimal point and decimal comma are accepted separately; mixed separators, zero, negative, non-finite and incomplete inputs are rejected. Unit changes are explicit conversions. Defaults, presets, URL mutation, browser storage, clipboard export, external formula rendering and unrelated balancing-standard wording were removed.