We start that process by asking six questions:
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1. Is the component stationary or mobile?
Stationary and mobile components take two very different approaches. Stationary components require a simple mounting system where you sandwich a vibration isolating material between two metal pieces. This simple solution can offer more accurate machining, longer product life, and reduced maintenance and is cost-effective.
Mobile devices require more specific and often complex solutions to make sure they are safe. Mobile equipment, particularly off-highway vehicles and marine applications, for example, experience more vibration than their stationary counterparts. Now, what if that rubber were to fail? Would your unit remain intact or separate from your system? Selecting a mount that is “safetied” becomes a critical consideration. You also need to factor in the varied external conditions they will experience. Numerous mounts can accommodate these, but they will need to be carefully selected to meet user-specific criteria perfectly.
2. What is the weight of the component we are isolating?
The weight of the component will directly impact what materials can be used to isolate them. While some materials may work well with your vibration. Static and dynamic loading on the isolation system need to be considered. Coupled with the inertial forces can the isolators contend with this? Pound-force per square inch (PSI) is a common failure point for incorrect materials.
A qualified engineer from RPM can provide insight into weight issues. Contact us for expert guidance.
3. How many mounting points will you have?
The mounting points are important and related both to weight and motion. The weight of the piece compared to the number of mounting points inform the minimum material strength. The number of mounting points can also lead to substantial differences in design.
4. Center of gravity details
For an effective vibration isolator, we must know where the center of gravity is. We also need to know where it is in relation to our isolators. We need this to get an accurate picture of the system dynamics, it becomes a very important isolator design consideration Again, this information is tied to understanding the loads and potential loads at the mounting points. Offset centers of gravity can cause very different loads for individual isolators.
5. What is the vibration source we are isolating?
Fans, motors, and pumps require different approaches to vibration isolation. Because each has variable frequencies and maximum allowable motion, each will require specific types of materials and mounting systems.
6. What are the environmental conditions?
Different elastomers have different responses to the environments in which they operate.. All of these questions are vital to know which materials will respond best for your application.
Vibrations can be harmful in many circumstances, particularly in the scope of engineered systems and construction spaces. They can propagate through mechanical waves, and as a result vibration isolation methods have been created to prevent vibrations from occurring, and absorb or dampen those mechanical waves.
Vibration isolation pads,
spring mounts
and hangers all contribute to the stabilization and support of heavy loads and equipment.
There are two main factors to look out for when selecting the right part:
Deflection
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Deflection is the degree to which a vibration isolator is displaced under a load. This determines how well the isolator will work. More deflection means less vibration transmission. These three different types of isolators yield different results:
Vibration isolation pads deflect the least, and can be efficient while installed under free standing equipment with operating frequencies higher than 1500 rpm
Neoprene vibration isolation mounts work well if mechanical equipment has to be bolted to the floor with operating frequencies larger than 1200 rpm
Spring isolators have the greatest deflection for maximum vibration reduction and are recommended to be installed in the areas where lower frequencies are present
Location
Where your equipment is located within the building is the main factor of which type of isolation method to select, whether that’s neoprene mounts or springs.
Neoprene mountings are suited for underneath equipment on very stiff support structures such as a ground supported concrete slab.
Spring are necessary for the upper building level, which is more susceptible to vibrations
If your business is looking for isolation pads, spring mounts or hangers, Vibrasystems Inc. has an experienced in-house team of engineers that can find the right fit for your project. Contact us today to learn about our custom engineering solutions!
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