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Questions fréquentes

1

Can you resolve the noise problems generated by a lift from a neighbor community?

The transmit problems genered by a lift noise are mostly solved. May be due to multiple cause (start, run the machine at high speed, brake performance of the contact control box, turn the speed limiter, etc), therefore to determine the main problems it is essential to do a vibracustic study. To do this we will contact the maintenance company and the affected resident to identified the causes to proceed to design solutions and apply the corrective measures, then we will checked and certified the maximum allowable levels of the installation by and appropriate noise and vibration measurement.

2

Metal spring isolator can be used in any load line position (arrow)?

No, most of the spring isolator manufacturers do not define a minimum and maximum load range to apply, but this can be represented by a load line in which appear any valid position to ensure the proper functioning of spring, but at this time is far from the reality:


If it is loaded beyond its maximum limit:

  • The spring will experience buckling and instability.
  • The spring will suffer loss of measurement.

Both condition produce sever decrease isolation and problems of stability and durability in the system.

It is loaded beyond its minimum limit.

  • The spring is too rigid thereby it will reduce its level of insulation.

3

How important is the quality of the materials in insulation systems?

The quality of the material is very important because it can affect the efficiency of the system.
Efficiency: high quality material will provide a greater degree of isolation.
Durability: In the market there are numerous isolation materials which have deficient characteristics, for example:

  • It can be decompose over the time.
  • Present significant efficiency loss of efficiency due to deterioration, (hardening, cracking, and breaking) by exposure to ultraviolet rays and temperatures charges in outdoor facilities.
  • This material can be torn or drilling easily in the installation producing sound isolation.
  • Present thickness loss under load over time (creep) occurring by construction problems and isolation.

That is the reason why a system designed and implemented with high quality material will have a better result in isolation, economizing efficiency and durability of the installation.

4

What is the reason of being the UNE-EN 12096 norn?

UNE-EN 12096. Mechanical vibrations. Declaration and verification of vibration emission values.
In the introduction to the standard, we highlights the fact that as users, designers, builders and authorities have a need for information on the issue of vibration generated by machines, for example to comply with the obligations described in the European Directives 89/392/EEC and 91/368/EEC on machines. This information is necessary to compare the vibration emissions of various products and to access the vibrations against vibration requiremens.


For the vibration emission values ​​been useful, uniform methods are needed that will achieve the following objectives:
 

  • The measurement of vibration values​​.
  • The determination of the value declared vibration emission.
  • The presentation of the value declared vibration emission.
  • The verification of the declared value of vibration emission.

In this sense, this standard establishes requirements for disclosure and verification of vibration emission values​​:
 

  • Provides guidance on the declaration of vibration emission values​​.
  • Describe the vibration information and the product to include in the technical documents supplied by the manufacturer to consumers.
  • Specifies the method to verify the declared vibration emission, established by the manufacturer.

5

¿What kind of UNE-EN rules exists about vibrations?

To do must mention that all legislation that is emerging in recent years based on the necessary adaptation of the national character of the successive national standards and European directives being developed by the European Standardization Committee (CEN); according to the internal rules of CEN, the following countries are obliged to adopt these European Standards: Germany, Austria, Belgium, Denmark, Spain, Finland, France, Greece, Iceland, Ireland, Italy, Luxembourg, Norway, Netherlands, Portugal , United Kingdom, Czech Republic, Sweden and Switzerland.

UNE standards arising from European standards developed by the Technical Committee CEN / TC 231 "Mechanical vibration and shock"

• UNE-EN 12096 (1997). Mechanical vibrations. Declaration and verification of vibration emission values​​.
• UNE-EN 1299 (1997). Mechanical vibration and shock. Vibration isolation of machines. Information for the application of source isolation.
• UNE-EN 100153 IN (2004). Climatización. Vibration isolators. Selection criteria.

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