The previous shaker table was made from thin sheet metal plates joined by welding. It utilized 8 pieces of rubber elements below the shaker table top and bottom parts.  The new shaker table integrated InfiniSpring® into the thin sheet metal structure. This is shown in Figure 1 below.

Figure 1. InfiniSpring® integrated into shaker table middle frame.

New Shaker Table with Integrated Springs

The frame was designed through finite element analysis. With the help of the analysis table, the weight and stiffness were optimized giving ideal performance for the shaker table. The table performance was enhanced by removing harmful natural frequencies from the operational range. Only wished vibration is excited in the new design giving desired performance.

Both the top and bottom part springs are integral to the table frame structure. Spring shapes are cut to the frame parts. With the integration, the number of parts required to build the table are reduced from 12 to 4. New shaker table is shown in Figure 2 below.

Figure 2. Eight pieces of InfiniSpring®-springs integrated into shaker table middle frame.

Vibratec Oy Benefits

• New shaker table design is simpler and manufacturing time is reduced
• New shaker table is more cost competitive and material costs are lower
• Vibratec Oy can manufacture the new shaker table frame together with the springs
• Shaker table performance is improved from the original
• Shaker table has highly technical appearance with high performance
• Shaker table is 100 % steel

New shaker table was presented on the Subcontracting Trade Fair in Tampere Finland in August 2021.

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Figure 1. Koja Oy heating, ventilating and air conditioning (HVAC) system.

Antti saw the potential in the InfiniSpring® integration and the new fan unit design was targeted to utilize InfiniSpring®-springs. Antti designated Miska Karttunen, an excellent candidate from Tampere University of Technology for the job.

MSc Thesis Main Targets

• Designing new fan unit frame with integrated springs
• Optimizing fan unit frame stiffness and mass
• Minimizing structure borne noise (SBN) from fan unit
• Ensuring the ease of fan unit manufacturing and assembly
• Enabling easy maintenance for fan unit

New Fan Unit with Integrated Springs

The most important factor in vibration isolation is to ensure high vibration isolation performance. This means that structure borne noise (SBN) from the fan unit to surroundings is minimized by making the vibration isolation very soft. The high flexibility of InfiniSpring®-springs enables this.

In the project new side beams were designed utilizing the 4HS35 integrated InfiniSpring®-springs. The beam is shown below in Figure 2.

Figure 2. Koja Oy fan unit side beam with integrated 4HS35 InfiniSpring®.

The developed fan unit with integrated springs has flexible spring installation natural frequencies below 10 Hz. Vibration attenuation percentage is above 85 % in whole operating frequency range. Meaning that high vibration isolation efficiency is achieved as a result of this.

With soft InfiniSpring®-springs, the fan frame required structural modifications. Koja Oy made the modifications with the help of finite element analyses and the fan design was modified to optimize fan structural resonance modes (fan elastic body modes) above operational frequencies. This led to improved overall vibration performance of the fan.

Koja Oy Benefits 

With soft springs high vibration isolation performance is achieved. Soft springs eliminate noise and vibration issues as fan loads are not transmitted through the soft springs to surroundings. Spring integration enables simplification of fan frame and separate vibration isolation elements are avoided. Also, the support structures for the vibration isolation elements can be avoided making the design simpler.

Remember this while Designing

It is important to manage the structural resonance modes of the actual product. In this case the fan elastic body modes. Critical elastic body resonance modes are preferably designed outside of the operational frequency range. Today, with the help of finite element analyses, structural designs can be optimized for soft springs, structural resonances avoided and top level vibrational performance guaranteed safely already during the design phase.

Here is a video introducing available InfiniSpring®-spring sizes.

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