Vibration & Tremor Monitoring

Vibration monitoring for sensitive equipment and facilities, buildings and structures

Ryobi G real-time vibration monitoring applications in Singapore have been proven to be highly relevant. Most important of all, the results acquired with our vibration meters and monitoring systems are reliable and accurate.  Besides real-time vibration monitoring for sensitive equipment, Ryobi G team specialises in vibration monitoring for buildings and structures as well.
 

Applications of our vibration techniques include:

  • Assess – Determine whether the vibration data acquired exceeds acceptable limits.

  • Investigate – Identify and verify vibration sources and transmission paths.

  • Mitigate – Recommend and implement modifications/adjustments to achieve the ideal reduction in vibration level.
     

In Singapore, some of the past project requirements include:

  1. Measure and quantify the impact of external vibration on vibration-sensitive equipment.

  2. Measure and quantify the impact of external vibration on the buildings and structures.

  3. Measure and quantify the impact of external vibration on human occupants in the affected buildings.

  4. Investigate transmission paths and sources of external vibration affecting human occupants and vibration-sensitive equipment.

Real-time vibration monitoring for sensitive equipment:
 

External vibration generated by construction activities here in Singapore may have adverse effects on the surrounding buildings, structures and vibration-sensitive facilities. These include hospitals, medical laboratories and semiconductor manufacturing plants which houses sensitive equipment such as Electron Microscopes, MRI Scanners, Surgical Microscopes and Laser Profilometers etc. Ryobi G’s vibration monitoring system is specially designed to detect such low-level vibration, which are below human perceptible in most cases. These vibration may cause imaging errors or even machine malfunctions. Ryobi G’s low-level vibration monitoring system offers the benefits and advantages of an integrated system with Real-time Monitoring, Alert System and Systematic Recording of Data.
 

With such features, corrective actions or mitigating measures can be carried out as early as possible, with the help of real-time data. Data and readings are all recorded systematically. Therefore, they may be reproduced as factual reports to provide better assessments of the environment. With the alert system which sends out alerts through SMS and webpage application, critical information will be highly accessible to key personnel.

Real-time tremor monitoring
 

It was reported that the South-East Asia earthquake and tsunami, which struck on 26 December 2004, affected millions of people in 11 countries. This event alone has contributed significantly to an increased awareness of the importance of Tremor Monitoring for city buildings, here in Singapore.

A Ryobi G Tremor Monitoring System (RG-TMS) in a building has the potential to:
 

Saves lives – Our system is able to pick up small tremors which are not obvious to people. Those small tremors could well be foreshocks. Save costs – a wrong decision of building evacuation can cause loss of man hours. In an event of any seismic activity, user will be alerted through SMS and/or email should the monitored parameters exceed predefined level(s). Real-time data are available over a secure web page, user(s) are able to log in and access the data, Anytime, Anywhere.

Advantages of a tremor monitoring system
 

  1. Immediate increase of safety standards in buildings / structures post seismic

  2. Decrease downtime costs from evacuation due to tremor activity

  3. Ability to report building state to relevant authorities

  4. Night awareness for pre-evacuation procedure in residential properties

  5. Increase property value / valuation

Page Case Diary: Vibration Assessment

For illustration purposes only. 

CASE: Analysis and assessment on unknown source of vibration affecting occupants and sensitive equipment.

STATUS: – CLOSED –

LOCATION: Singapore

INVESTIGATION TEAM: Vibration Assessment Team.

INCIDENT: A group of occupants within a particular area of the building complained about the long lasting vibration they felt on the walls, floor, desks and equipment in their facilities. Vibration levels were sometimes causing severe discomfort to human beings so much so that many reported having headaches and felt dizzy after experiencing these vibration for hours almost every day within a week. These continuous, perceptible level of vibration not only caused annoyance to the occupants; they affect the reliability of sensitive equipment used in their laboratory experiments. Therefore, source of unknown vibration had to be identified.

DETAILS OF INVESTIGATION AND ASSESSMENT: The investigation team conducted an initial site vibration assessment to gather on-scene observations and feedback from occupants at the affected area. It was observed that there were in fact many different types of equipment and machines housed within that affected areas. On first look, there were office equipment, thermal freezers and other laboratory equipment. Continuous vibration was felt at the scene and these observations corresponded with the complaints lodged by the occupants.

The investigation team then split up to identify and shortlist any potential sources of vibration found within and around the building. At the end of the physical search, there found to be several potential sources at different locations. These potential sources include vehicle traffic from main road entrances, heavy machineries within the building, construction activities near the building and freezers housed in the laboratory.

After the site survey was done, the team carried on with the most critical part of the investigation plan: vibration data acquisition. During the first few hours of the data acquisition process, efforts were all focused on identifying the worst-hit spot within the affected area. Preliminary analysis on the data suggested that the level of vibration across all affected rooms indeed exceeded the perceptible level of the dominant frequency, which was identified to be around 20 to 30Hz one-third octave band. Highest level of vibration recorded was closed to 600 micrometers per sec.

The complaints lodged by the occupants were absolutely valid.

Further investigation, assessment and analysis were carried out by conducting vibration data acquisition at all potential vibration sources shortlisted during the initial site vibration assessment.  The second stage of the vibration data acquisition process produced a vast variety of results, in terms of the velocity and dominant frequency found in those data. These outcomes signalled the team to narrow their search down to the sources with dominant frequency around 20-30Hz one-third octave band.  There were two suspected culprits that stood out after the analysis, one of which was the mechanical pump housed below the affected area.

Efforts were then heavily concentrated at proving and nailing the suspect. Measurements were taken again near the mechanical pump to verify its spectral and temporal signatures. This verification step yielded a conclusive result. During operation, the mechanical pumps produced vibration that could hit a level closed to 4,000 micrometers per second mark. Dominant frequency of that data was found to be around 20-30Hz one-third octave band as well.

Result was conclusive and the case was closed without further inquiry.

RECORDED ON: August 2014, Singapore

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