First let me thank the over 5000 customers now using the Vibraplane for their isolation needs. It has been a real pleasure to make so many customers enjoy their systems more than ever.
For those that are not clear on how the Vibraplane works, compared to "standard" isolation products, let me see if this might help:
Conventional isolators are constructed using metal springs or rubber blocks. They have low internal damping, and tend to be effective only at frequencies near 10 Hz. Also, they provide almost no isolation at frequencies above 30 Hz because of harmonic standing waves occurring at sonic velocities in the metal or rubber.
The VIBRAPLANE design concept eliminates the metal springs and or rubber blocks used in conventional isolator designs. The VIBRAPLANE utilizes a frictionless rolling diaphragm air seal to support a load carrying piston in conjunction with dual air chambers as the spring and damping medium. The air spring stiffness is a function of the combined air volume of the dual chambers. This conveniently provides the required very low stiffness to obtain the desired very low natural frequency necessary for high efficiency isolation. Harmonic standing waves cannot occur in the VIBRAPLANE System due to its dual air chamber internal damping design.
The VIBRAPLANE utilizes a unique proprietary VARIFLO orifice design for flow control between air chambers, and therefore, better damping control is realized both high and low amplitudes and frequencies. This design ensures an even air flow at all amplitudes without choking, thereby maintaining the effectiveness of both (airspring) chamber volumes.
It can easily be shown that VARIFLO damping incorporates a filtering spring. This contrasts with vibrations in a conventional isolator model where the damper is direct coupled to the mass and causes a loss of isolation at high frequencies. The VARIFLO damping (air) spring effectively decouples the damper at high frequencies and therefore no isolation is lost where high damping forces would tend to reduce efficiency in a conventional isolator.
Zero Friction
The VIBRAPLANE design uses a thin wall frictionless rolling diaphragm to support the (airspring) piston. This unique design prevents friction locking, which is a principle cause of loss of isolation for low frequency, micro-inch disturbances in conventional Isolators.
The dual chamber design of the VIBRAPLANE produces a unique optimization of its vibration Transmissibility performance. At low frequencies the air volume in both air chambers is effective, resulting in large air volume and a soft low natural frequency system. This is represented by the left branch of the Transmissibility curve. At high frequencies, the orifice gradually restricts the air flow and eventually only the small chamber is effective with a resulting stiffening of the system. This action is represented by the right branch of the Transmissibility curve. Our proprietary orifice design is amplitude sensitive and configured to produce the optimum transmissibility bounded by the left and right branches. The VIBRAPLANE thus affords the ideal conditions of maximum damping at resonance and minimum damping at high frequencies for better isolation than possible, using conventional isolation systems.
Horizontal vibrations (in buildings) average 25% to 30% of the vertical and are usually less critical. Nevertheless, the VIBRAPLANE System includes a Horizontal Isolation Piston to provide isolation for any vibration environment regardless of direction.
The piston is internally constructed with rubber-in-shear elements that simultaneously translate and rock in a low frequency coupled response action to horizontal inputs. The Vibraplane Platforms use an onmi-directional low frequency pendulum system to eliminate horizontal vibrations.
Finanlly, structural damping is used throughout which eliminates the ringing caused by resonances in the frame, table, and platform structures external to the VIBRAPLANE airspring suspension system. All structures experience resonance no matter how stiff or massive. Damping augmentation is the most efficient means to dissipate vibration energy,
Hope this has been helpful. There are many products now on the market, all help and can be "heard". Please feel free to e-mail us off-line for further information.
A very Happy and SOUND Holiday season to all........
Steve
SOS
For those that are not clear on how the Vibraplane works, compared to "standard" isolation products, let me see if this might help:
Conventional isolators are constructed using metal springs or rubber blocks. They have low internal damping, and tend to be effective only at frequencies near 10 Hz. Also, they provide almost no isolation at frequencies above 30 Hz because of harmonic standing waves occurring at sonic velocities in the metal or rubber.
The VIBRAPLANE design concept eliminates the metal springs and or rubber blocks used in conventional isolator designs. The VIBRAPLANE utilizes a frictionless rolling diaphragm air seal to support a load carrying piston in conjunction with dual air chambers as the spring and damping medium. The air spring stiffness is a function of the combined air volume of the dual chambers. This conveniently provides the required very low stiffness to obtain the desired very low natural frequency necessary for high efficiency isolation. Harmonic standing waves cannot occur in the VIBRAPLANE System due to its dual air chamber internal damping design.
The VIBRAPLANE utilizes a unique proprietary VARIFLO orifice design for flow control between air chambers, and therefore, better damping control is realized both high and low amplitudes and frequencies. This design ensures an even air flow at all amplitudes without choking, thereby maintaining the effectiveness of both (airspring) chamber volumes.
It can easily be shown that VARIFLO damping incorporates a filtering spring. This contrasts with vibrations in a conventional isolator model where the damper is direct coupled to the mass and causes a loss of isolation at high frequencies. The VARIFLO damping (air) spring effectively decouples the damper at high frequencies and therefore no isolation is lost where high damping forces would tend to reduce efficiency in a conventional isolator.
Zero Friction
The VIBRAPLANE design uses a thin wall frictionless rolling diaphragm to support the (airspring) piston. This unique design prevents friction locking, which is a principle cause of loss of isolation for low frequency, micro-inch disturbances in conventional Isolators.
The dual chamber design of the VIBRAPLANE produces a unique optimization of its vibration Transmissibility performance. At low frequencies the air volume in both air chambers is effective, resulting in large air volume and a soft low natural frequency system. This is represented by the left branch of the Transmissibility curve. At high frequencies, the orifice gradually restricts the air flow and eventually only the small chamber is effective with a resulting stiffening of the system. This action is represented by the right branch of the Transmissibility curve. Our proprietary orifice design is amplitude sensitive and configured to produce the optimum transmissibility bounded by the left and right branches. The VIBRAPLANE thus affords the ideal conditions of maximum damping at resonance and minimum damping at high frequencies for better isolation than possible, using conventional isolation systems.
Horizontal vibrations (in buildings) average 25% to 30% of the vertical and are usually less critical. Nevertheless, the VIBRAPLANE System includes a Horizontal Isolation Piston to provide isolation for any vibration environment regardless of direction.
The piston is internally constructed with rubber-in-shear elements that simultaneously translate and rock in a low frequency coupled response action to horizontal inputs. The Vibraplane Platforms use an onmi-directional low frequency pendulum system to eliminate horizontal vibrations.
Finanlly, structural damping is used throughout which eliminates the ringing caused by resonances in the frame, table, and platform structures external to the VIBRAPLANE airspring suspension system. All structures experience resonance no matter how stiff or massive. Damping augmentation is the most efficient means to dissipate vibration energy,
Hope this has been helpful. There are many products now on the market, all help and can be "heard". Please feel free to e-mail us off-line for further information.
A very Happy and SOUND Holiday season to all........
Steve
SOS