Designing the products that protect our world requires constant innovation and a persistent search for the best materials…materials that are lighter, stronger, flexible, and more reliable. At Rogers Corporation, we are passionate about helping design engineers meet critical product performance requirements.
Our Elastomeric Material Solutions group has created a series of calculators and online tools to solve critical design challenges, addressing anything from ultra-thin protection for sensitive electronics to robust gasketing for automotive applications.
The latest addition is the Vibration Isolation Efficiency Calculator. It recommends the proper PORON™ VXT® Polyurethane material for vibration mitigation applications. This tool uses the design engineer’s system specifications to calculate the isolation efficiency of our materials and provides the most effective Rogers material solution.
The Vibration Isolation Efficiency Calculator joins our extensive suite of calculators, design guides, and tools for material selection, stress-strain calculations, test data studies, and more.
Elastomeric Material Solutions Web Resources:
- PORON® Performance Polyurethane Material Selection Tool: This tool will help you select the right PORON® polyurethane to meet comfort and impact protection design requirements for footwear and apparel.
- PORON® Polyurethane Materials for Gasketing and Sealing Selection Tool: This tool will help you find the PORON® polyurethane or BISCO® silicone material to meet your sealing and gasketing design requirements.
- Compression Force Deflection (CFD) Curve Tool: The CFD Curve Tool can help identify PORON® polyurethane materials, using stress-strain data, to meet your engineering requirements.
- Gap Filling Tool: The PORON® polyurethanes Gap Filling Tool will assist in choosing the proper material to meet final gap thickness requirements.
- Dynamic Stress: Strain data request.
- XRD® Technology Online Selection Tool: Screen Rogers foam materials for suggestions for energy management in low, medium, and high impact applications, from cell phone drops to lacrosse ball shots.
- Technical Sealing Guide: The Technical Sealing Guide provides a comparative test-based data study on sealing and gasketing materials while highlighting essential criteria for long-term sealing solutions in enclosure applications.
- Sealing Design Guide: A shortened version of the technical sealing guide.
- Rogers Handheld Shock Control Design Guide: Protecting the LCD Glass of handheld devices is increasingly important. The Rogers Handheld Shock Control Design Guide covers everything you need to know about how PORON® polyurethane materials protect the displays in handheld designs.
- Material Selection Guide for Industrial Applications: Covers availability, physical properties, electrical and thermal properties, temperature resistance, flammability and outgassing, and environmental characteristics for such applications as environmental seals, vibration isolation, and sound damping.
- Material Selection Guide for Portable Electronics: Covers availability, physical properties, electrical and thermal properties, outgassing, and environmental characteristics for mobile phones, cameras, speakers, and more.
Design Tools Index: Download the design tools you need today.
This is an excerpt from a white paper authored by Noah Buschard, Applications Engineer at Rogers. Noah breaks down the concepts of Vibration Isolation and Damping in Material Design.
Vibration management should always be considered in any engineering design. Applications that have effectively incorporated vibration management surround us every day, from buildings to rail cars. Even the mirrors on our cars have to pass a vibration test to ensure visual clarity at high speeds. Designs that neglect to properly address vibration often result in malfunctioning components and, in some cases, catastrophic failure.
The Two Facets to Vibration Management: Isolation and Damping
There are two facets of vibration management: isolation and damping:
- Isolation is the prevention of vibrations from entering a system.
- Damping is the absorption of the vibration energy that is entering the system and dissipating it by changing the kinetic energy of vibration into a different form of energy.
The two forms of vibration management are different from each other, but often are used in conjunction to achieve the desired performance.
To best understand vibration, there are a few key concepts to consider:
- Transmissability which is defined as the percent of vibrational energy that is being transmitted through a structure
- Natural frequency also known as resonant frequency, is the specific frequency at which a material will naturally vibrate
Damping and isolation are very different approaches to vibration management, but are often used interchangeably in conversations and specifications. It is important to recall the definitions mentioned above and understand that isolation and damping have different effects on the system. In fact, having a large amount of damping has a negative effect on isolation and vice versa. In Figure 8, it can be seen that as the damping ratio increases the region of isolation decreases.
The easiest way to determine whether a damper or an isolator is needed is to identify the frequencies that are of concern. Selecting the correct isolator will shift the natural frequency lower and move the frequencies of concern into the region of isolation, preventing them from penetrating the system. When the system’s natural frequency can not be shifted lower and the frequencies of concern are located near or at the natural frequency, damping is the appropriate method of vibration management.
This paper will be available for download in a few weeks. An updated link will be provided at that time.