Squeak and Rattle Director Applications

Altair® Squeak and Rattle Director™ Applications

Altair’s Squeak and Rattle Director (SnRD) enables expert and novice computer aided engineering (CAE) engineers to rapidly identify and eliminate a variety of sound, vibration, and perceived quality issues in products at an early design stage.

Users can easily analyze multiple loading scenarios – static, dynamic, thermal events or even a combination of them – then identify root causes through modal contribution studies and find robust design solutions through numerical optimization, all without the need for a physical prototype.

SnRD is the only integrated platform which facilitate finite element (FE) model building, dynamic solvers, diagnostics, and FE-test correlation. All working concurrently.

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Perceived Quality

Detect, prevent, and eliminate risk of squeaks and rattles. Improve the touch-and-feel of products through a simulation that measures resistance and identifies possible squeak issues while a consumer is touching and/or pressing the parts. Study the sealing behavior and how it compresses to determine any risk for seal squeak due to continuous random compression.

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Warranty Prevention

Over time, continuous vibration can wear out components and cause failure. Use SnRD to track where and how often components interact and evaluate possible fixes.

Paint abrasion is another very costly warranty issue caused by unanticipated chafing between two subsystems or components. SnRD provides an upfront answer as to where there a is higher risk of paint abrasion.

Device Sound Quality

The sounds caused by the interior parts of speaker interacting with each other while playing music can drastically affect the sound quality. Vibration of the speaker can cause a squeak between the speaker mounts and ground. With SnRD, users can easily perform what-if scenarios with different ground-bases to accurately evaluate the risk of sound quality issues.

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Electrical System Safety

Pinching of cables inside a battery box causes damage but also catastrophic failures such as fires. With simulation, engineers can investigate complex modules for possible contact problems with interior cables.

Impacts between high-voltage components in an ECU can also cause dramatic failure. Use SnRD to detect and prevent issues related to electrical components colliding and losing function due to vibrational loads.

Featured Resources

Altair Squeak and Rattle Director - Basic Screening Risk Assessment

Altair’s Squeak and Rattle Director (SnRD) enables expert and novice computer aided engineering (CAE) engineers to rapidly identify and eliminate squeak and rattle in products at an early design stage. By utilizing a novel set of tools and methods in a streamlined, semi-automated process that is fully integrated in the Altair HyperWorks™ environment, SnRD simplifies otherwise complex and time-consuming tasks.

Use Cases

How CEVT Improves Vehicle Architecture and Eliminates BSR Through Simulation - Part 1

ESL Development Based on Simulation - Application example The body stiffness has a major impact on the Squeak & Rattle performance of a car. Since the body structure of electrical/autonomous cars will differ clearly from traditional bodies, an enhanced requirement is needed to limit the distortion in the closure openings. This webinar presents a new approach of defining a requirement based on closure deformations using an equivalent static load (ESL), which considers both the reduction from a complete vehicle to a BIG and from a dynamic load to a static load. In addition, an example is shown how ESL can be used as input for body optimization. Presenter: Viktor Jonsson | CAE Engineer (Consultant), CEVT


Sound and Simulation: Designing a Smart Speaker

Speaker design and analysis, especially for a more complex product, system, or component, often requires building multiple simulation models.

Technical Paper

Identify & Eliminate Squeak & Rattle Phenomena with Access to Ziegler's PEM Database

Reducing the presence of interior Squeak and Rattle (S&R) noises has become an on-going trend within the Automotive and Aerospace communities. Read more to see how Ziegler's PEM database helps to identify eliminate this phenomena.

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