Noise & Vibration Associates - Software Overview

Vibration Isolation Project - (VIP)

VIP.exe is a simple to use tool to enable the calculation of properties of resilient isolation systems. The methods are based upon simple application of Newton's Laws and all systems are assumed linear. Any number of resiliently connected rigid bodies and foundation may be analysed.

Subsequent enhancement may include the incorporation of non-linear mount elements (with respect to mount displacement and vibration frequency).

Contact NVA for more information or download a trial version of this software:

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info@noiseandvibration.com

VIP is a Windows Application that enables calculation and assessment of Resilient Isolation System performance.

Isolation systems are defined by Bodies (Masses, Inertias, Centre of Gravity Locations) and Mounts (Stiffnesses , Damping, Location of Attachment to each Body or Foundation) connecting the Bodies together or to a Foundation.

An isolation system may be saved to file once defined and data on Bodies and Mounts (stiffness + damping) may be saved to or retrieved from a free standing Database.

The system (as is) will handle any number of Bodies and Mounts in full 3D (6 degrees of freedom per body).

Ultimately, capabilities will be extended to include for the effects of additional "Dampers" and "Buffers".
Enter data for isolated bodies (Masses, Inertias, Centre of Gravity Location)

All units are currently SI.
Enter Mass, Principal Inertias, Cross Product Inertias, (Static) Position of Centre of Gravity.

The Body is then entered into the Global Reference Frame with Ixx aligned to the Global x-axis, etc. Any required rotations may then be included by specifying sequential rotation of the Body about the Global X, Y, Z axes.
Enter data for Isolation Mounts (Stiffness, Damping, Placement)

A "Mount" will be connected to a "Body" at one end and another "Body" or a "Foundation" at the other end.

Enter the (Global Reference Frame) co-ordinates of the connection points at each end of the mount.

Also enter the Mount dynamic properties (Stiffness - Kxx, Kyy, Kzz, Damping - Cxx, Cyy, Czz).

The Mount is then entered into the Global Reference Frame with Kxx aligned to the Global x-axis, etc. Any required rotations may then be included by specifying sequential rotation of the Mount about the Global X, Y, Z axes.
Body and Mount data may be obtained from a local database to be maintained by user.

The "Local Database" may be modified according to user requirements to contain all current data on Mounts and Bodies. These may then be entered to a system by the click of a button (rather than entereing relevant data manually).

The user will still have to enter geometrical data (where the mount is positioned and how it is aligned).
Calculate natural frequencies and modes (Eigenanalysis).

An initial analysis might be to determine Eigenvalues (natural frequencies) and associated Eigenvectors.
Compute response (Frequency Response Function) to general system of applied forces and torques. Computed response may be at any body position and in any direction.

Resonant frequencies and response deflections (due to any defined system of steady state forces) at any position may be graphed.
Compute Force Transmissibility Ratio (Frequency Response Function) to selected force or torque. Computed result may be at any mount/foundation connection and in any direction.

Transmissibility ratios between any force and the Foundation connection at any mount (any direction) may be graphed.
Compute linear shock response (Time History) to general system of applied transient forces and torques. Computed response may be at any body position and in any direction.

Response (any Body, any Direction) to transient forces (user defined) may also be graphed.