Torsional Vibration Natural Frequency implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t5-113

Effect

Computation or source lookup only

Input and validation requirements

The specification provides no stated domain-validation rules. L = 0 causes division by zero and must be rejected; negative stiffness inputs produce an undefined real square root. The formulas also do not define an actual piecewise branch at the sign switch.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "G_Pa": 80000000000,
    "Jp_m4": 1e-8,
    "L_m": 1,
    "J_disk_kg_m2": 0.02
  },
  "expected_outputs": {
    "kt_Nm_per_rad": 800,
    "omega_n_rad_per_s": 200,
    "fn_Hz": 31.83098862
  },
  "working": "kt=(G·Jp)/L=(80,000,000,000·0.00000001)/1=800 N·m/rad. ωn=√(kt/J)=√(800/0.02)=√40,000=200 rad/s. fn=ωn/(2π)=200/6.283185307=31.83098862 Hz."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche5/tranche5-results.json