SOFTWARE

Comet VA: Virtual Acoustics


Comet VA TM is an advanced analysis software for full frequency spectrum simulation of dynamic systems. It uses finite element method to predict vibroacoustic responses by solving wave-based equations at low frequencies and and energy flow equations at high frequencies. It is the only commercially available stand-alone software that uses finite element models for the solution of dynamic systems at both low and high frequencies.

By giving you a beter understanding of the noise your products will make, COMET VA helps you refine your design - before investing in costly physical prototypes. COMET offers key advantages over competing solutions: it is easier to use and developed by engineers known for acoustic expertise.
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Benefits

Ease of Modeling
Full frequency virtual acoustic simulation of dynamic systems using the same modeling framework. Prediction of low and high frequency vibroacoustic response using the same finite element model, although use of ‘fine’ finite element model is not needed for high frequency analysis.

Optimal Design of Structural Components and Noise Control Treatments
Systematic analysis and design improvement of acoustic products at early states of product development without the need to rely on costly physical prototypes. Overall approach to sound management by considering sound propagation, radiation and transmission in a variety of media including fluid, solids and noise control treatments.

Intuitive modeling that requires less user expertise and experience
Finite element models for modeling dynamic systems are easily derived from models that are typically used for many other engineering analyses.




Key Features

Wave-Based Solutions

Comprehensive Analysis Capabilities
Frequency response and eigenvalue analyses. Static analysis of elastic solids and structures. Interior and exterior modeling.

Coupling of Media
Modeling of fluid, solid and noise control domains. Nodal and elemental coupling of domains.

Extensive Element Libraries
Acoustic element, structural elements and noise control treatments (NCT) including elastic foam, rigid foam, limp foam, fibrous foam and perforated panels.

Enhanced Capabilities
Mixed pressure-displacement formulation to reduce proglem size (Degress of Freedom - DOF). Infinite elements for exterior acoustic domains. Two-dimensional, three-dimensional, axi-symmetric and generalized axi-symmetric domains.

Energy-Based Solutions

Comprehensive Analysis Capabilities
Frequency response analysis at discrete frequencies. Prediction of transmission loss. Interior and exterior modeling.

Coupling of Media
Modeling of fluid, solid and noise control domains. Automated generation of joints, including joints at noise control treatments.

Extensive Element Libraries
Acoustic element, structural elements including rods and beams, isotropic and orthotropic plates, and honeycomb (sandwich). Noise control treatments (NCT) including elastic foam, rigid foam, limp foam, fibrous foam and perforated panels.

Enhanced Capabilities
Modeling of leakage, conservative and non-conservative joints, local damping and direct field excitations, and user-defined elements and joints.


Comet BEAT: Boundary Element Analysis Technolgy


Comet BEAT TM is a comprehensive boundary element analysis technology that allows complete engineering analysis of many physical phenomena. Use of BEAT gives engineers several outstanding productivity gains since it models only a mesh on the surface of the analysis domain (i.e., no interior mesh is required).
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Benefits

Reduced Modeling Effort
Unlike widely used finite element method which requires the modeling of the problem domain, the boundary element analysis requires only the modeling of the surface of the problem domain.

Improved Accuracy
Geometry and response variables are approximated at the surface of the problem domain. Interior responses are computed using surface response without additional approximation. For exterior problems, meshing of exterior domains is not required since behavior is exactly modeled using appropriate fundamental solutions.

Efficient Solutions
Accelerated methods such as fast multi-pole (FMM) are used to reduce computational requirements (memory and solution time).
Sub-structing with static-condensation (Guyan reduction) to reduce memory and solution time.
Key Features

Multiple Domains and Dimensions
Multiple connected, two dimensional, three-dimensional, axi-symmetric and generalized axi-symetric domains.

Elastic Stress Analysis
Isotropic and anisotropic anslyses with body forces.

Dynamic Analysis
Free vibration analys is and forced periodic response analysis.

Thermal Stress Analysis
Steady-state and transient thermal stress analysis, concurrent heat transfer and stress analysis, and thermal distortion analysis.

Heat Transfer Analysis
Steady-state and transient heat conduction, thermal resistance across subregions, and other potential flow or diffusive systems such as corrosive electrolytic processes and electrostatics and ground water flow.

Acoustic Analysis
Acoustic eigenfrequency analysis, general periodic and transient scalar wave problems, structural acoustics and FEM regions.

Fracture Mechanics Analysis
Elastic analysis with body forces, periodic dynamic analysis, and thermal fracture analysis.