Posts Tagged ‘NVH’
Frequency Response Analysis is used to calculate the response of a structure subject to steady state oscillatory excitation. Typical applications are NVH (Noise, Vibration and Harshness) analyses of vehicles, rotating machinery and transmissions. The analysis is to compute the response of the structure, which is actually transient, in a static frequency domain. The loading is sinusoidal. The loads can be forces, displacements, velocity and acceleration. The response occurs at the same frequency and damping would lead to a phase shift. The outputs from a frequency response analysis are displacements, velocities, accelerations, forces, stresses and strains. The responses are usually complex numbers that are either given as magnitude and phase angle or as real and imaginary part.
|Erwan BeauchesneSoftware Development Manager, Manufacturing Technology at Altair|
Coupling simulations from different domains is becoming increasingly important, considering the evolution of CAE toward multi-physics problems. As an example, utilizing residual stress/strain as well as thinning information from metal-forming simulation is gaining rapid acceptance in the structural CAE community. Most of the time, components of full-car crash models are defined independently from any residual stresses and strains, and thicknesses are considered as nominal, whereas a lot of these ones have been manufactured thru stamping or bending processes.
To neglect these initial conditions leads to inaccurately capture the material response under structural loading, which is especially true with advanced high strength materials, which are gaining more usage for weight reduction.
Similar needs can be seen in a variety of other simulation domains. To transfer data between CFD and structural CAE is also realized in aircraft wing design process. CFD analysis is used to evaluate the wind pressure, which has to be passed on to the structural analysis model to evaluate stresses. However, the mesh for CFD and structural analysis are different so that it is necessary to map the data via interpolation between the two meshes. Similarly, in electronic cooling systems, heat transfer analysis often is followed by a structural analysis, which uses a different mesh, to evaluate distortions.
We are seeing a growing number of customers coupling their simulation results with structural CAE making the development of robust, efficient and accurate mapping tools very important.
Global Appliance Manufacturer Mabe Analyzes Spin Cycle with HyperWorks to Improve Washing Machines and Bring Them to Market Faster
Typically when engineers consider the most complex problems involving multi-body dynamics, hydrodynamics, and noise-vibration-harshness, they are focusing on the complexities of automobiles or aircraft. Design issues that can be just as challenging, however, impact every household’s laundry room. For companies like consumer goods manufacturer Mabe, simulation has helped them better solve product issues such as balance ring distortion, move products to market faster and reduce cost.
Jianmin Guan- Senior Program Manager-Noise, Vibration & Harshness
Noise and vibration are important characteristics in modern life. For example, we experience noise and vibration every day when we drive to work, and they are important causes for component failures in airplanes and space vehicles. Therefore, it is important for us to understand how noise and vibration are transmitted and to find ways to reduce them.
Traditionally, noise and vibration problems are analyzed using the Modal Analysis approach. Vibration modes (or normal modes) are intrinsic ways a structure can sustain motion and carry energy. Each mode is typically associated with a (more…)
VMAP by TechPassion – HW Partner Alliance Spotlight
Noise Vibration and Harshness
VMAP is a comprehensive software tool for vibration testing on real-world engineering systems that seamlessly connects virtual simulation and physical testing.
- Addresses the needs of both beginners and expert users.
- Calculates damping, resonant frequencies, MAC (Modal Assurance criteria) and other parameters with just a few mouse clicks.
- Programming interface to develop curve fitting algorithms, update finite element simulation models with the damping estimates obtained from VMAP and analyze the updated simulation models.
- Identify the failure modes in prototypes quickly and reduce product development cycles.
- VMAP is available as a plug-in within HyperMesh.
“In 1949, the concept of FRF was developed. Yet, the engineers never had a simple tool to conquer vibrations in engineering systems. VMAP sets a new standard as the most advanced and user-friendly experimental modal analysis and FEA-Test correlation software package. In a nutshell, I wish VMAP was around when I was doing my research at MIT ten years ago.”
Dhanushkodi Mariappan - CEO, TechPassion