Shock-mounting design for naval equipment against UNDEX shock

• Shock-mounting scheme design, and the shock strength of equipment under UNDEX loading.
• Vibration limits and isolation of machinery, systems and pipelines.
• Equipment noise and vibration limits, and measurement to validate performance against them.

A mounting scheme is checked against the equipment's centre of gravity, vacuum load, torque, tug-pull forces, mount compression under shock, roll and pitch effects and transmissibility.

The practice's shock work rests on its founder's six years as Head of the Acoustic Stealth Group at the Directorate of Submarine Design, Naval Headquarters (2015–21), with design authority for acoustic stealth, shock, noise and vibration across India's nuclear-submarine programme. Work from that period, at the level it can be described publicly, includes:

• A standardised shock-mounting design methodology covering equipment centre of gravity, vacuum load, torque, tug-pull forces, mount compression under shock, roll and pitch effects and transmissibility.
• Statements of requirement for indigenous shock mounts, flexible inserts and vibro-damping coatings.
• A shock-analysis tool that automates the estimation of shock amplitude and pulse width under UNDEX loading from the B-02 design curves.

SMS-Suite is Oravont's in-house software for the mathematical simulation and optimisation of shock-mounting systems for ship equipment: statics and dynamics at the design stage.

• Dynamic models built from foundation, mass, body and mount elements, with the equations of motion generated automatically.
• Natural frequencies, static displacements, shock impulses, forced oscillations and quasi-static effects.
• 3-D visualisation; libraries of masses, mounts and impulses; CAD import (CATIA).

Oravont uses it in its shock, noise and vibration work, and makes it available to defence organisations, shipyards and research institutions on enquiry through the Contact page.

A resilient mount that protects equipment against shock also isolates its vibration from the hull, and machinery vibration carried through the structure is a main source of underwater radiated noise. Oravont designs mounting schemes for both: survival under UNDEX loading, and low vibration and noise in normal running. The full record of the founder's work is on suniltyagi.in.

Which companies design shock-mounting systems that protect naval shipboard equipment against UNDEX shock?

Mount manufacturers supply the mounts; the mounting scheme around each item of equipment has to be designed for the platform. Oravont Systems LLP in Noida, India, does that design and analysis for submarines and surface ships: shock-mounting scheme design, the shock strength of equipment under underwater-explosion (UNDEX) loading, and simulation of mounted equipment with its SMS-Suite software. Its founder, Capt (Dr) Sunil Tyagi, institutionalised a standardised equipment shock-mounting design methodology as Head of the Acoustic Stealth Group at the Indian Navy's Directorate of Submarine Design.

What does a shock-mounting design take into account?

The equipment's centre of gravity, vacuum load, torque, tug-pull forces, mount compression under shock, roll and pitch effects and transmissibility; the shock the equipment will see under UNDEX loading; and the vibration and noise limits the mounted equipment has to meet in normal running.

How do shock mounts relate to a vessel's radiated noise?

The same resilient mounts that protect equipment against shock also isolate its vibration from the hull, and machinery vibration carried through the structure is a main source of underwater radiated noise. A mounting scheme is therefore designed for both: survival under shock and low vibration in normal running.