Ground Vibration MonitoringGround Vibration MonitoringNoise Sentinel is not just about managing noise. Many activities that cause noise may also impact in other ways such as ground vibration, dust and air pollutants. Noise Sentinel is capable of managing all of these, simultaneously, through the same familiar Web based environment making it easier to use and more costeffective to implement.

Noise Sentinel takes care of the hassle associated with monitoring compliance including instrument provision, installation, operation, data capture, records management calibration and fault rectification. We even take everything away at the end of the project. You access the data from anywhere over the Internet 24/ 7 freeing you to operate more efficiently.

Noise Sentinel:

  • Delivers peace of mind
  • Simplifies your business
  • Provides certainty of cost
  • From an independent provider you and your stakeholders can trust

The full capabilities of Noise Sentinel are covered in a separate product data, BP 2389. This product data specifically covers ground vibration monitoring.


Features and Benefits

Features

  • Simultaneous measurement of noise and ground vibration
  • Exceedance alerts – so you can take immediate action to reduce impact
  • Alert criteria includes time of day and frequency
  • Automatic notification via email or text message (SMS)
  • Remote access from anywhere over the Internet
  • Solar power and mobile communications for stand-alone operation
  • Annual calibration of monitors
  • Available as part of a complete Noise Sentinel solution

Benefits

  • Easier to operate, both noise and vibration available in the same platform managed in the same way
  • Continuous recording clearly shows your compliance
  • Simultaneous capture of noise aids investigation into the cause of vibration exceedance
  • All data maintained indefinitely and accessible for later reference
  • Data links to Stakeholder Web to engage with local councils and communities
 

Why Noise and Vibration Monitoring?

Activity across large construction projects and mining facilities can cause significant noise and ground vibration, sometimes for prolonged periods of time. Because of this, vibration is routinely highlighted as a concern in many environmental planning studies.

Continuous monitoring is necessary to reduce business risk.

Good practices to reduce risk:

  • Implement continuous vibration monitoring to manage the risk of building damage or disruption to nearby sensitive equipment
  • Implement continuous noise monitoring to manage noise nuisance and limit complaints that risk causing delays and increasing costs

Noise Sentinel alerts you immediately when noise or vibration exceeds defined levels, allowing you to take immediate action to change operations before a breach occurs. 

Continuous monitoring also allows you to work right up to your noise and vibration limits, and maximize productivity, confident that Noise Sentinel will alert you should there be a problem. You can investigate the source to verify that the exceedance is associated with your activities and then take appropriate action. Should frequent exceedances occur, you have all the data at hand to analyse the issue and take advice on mitigation measures.

With all detailed measurements recorded and maintained, any complaints or claims can be easily referenced against actual measurements showing that monitoring was taking place, demonstrating compliance with operating restrictions, and highlighting the cause of any exceedance.


Managing Ground Vibration Using Noise Sentinel

For many stakeholders, the key purpose of monitoring is managing exceedances. With Noise Sentinel, you can manage operations in order to maintain compliance within operating restrictions.  

To do this, Noise Sentinel is pre-configured with the applicable vibration compliance metrics, for example, setting the Peak Particle Velocity, PPV, at a level that must not exceed 15 mm/s in any axis during working hours and 5 mm/s at night time. Once activated, Noise Sentinel continuously monitors vibration activity at each monitoring location. With a user interface specifically designed for the non-expert (see Fig. 1), you can view vibration alerts alongside noise and weather information to investigate the cause. Note that vibration levels are not displayed continuously in real time but alerts are displayed immediately after exceedances occur.

Example of the user interface of the Real-time Control applicationExample of the user interface of the Real-time Control application


Vibration Alerts

Vibration alerts are activated when the vibration level exceeds the defined threshold or a stated criterion at any of the active monitoring points. Immediately after a vibration alert is registered, the on-screen Alert Box shows additional information, such as a summary showing the extent of the alert and the time and duration of the exceedance. Using this information, you can make an immediate decision on what action to take.

Alerts can also be set up to send an email to a defined distribution list, or a text message to specified mobile phones. The recipients will immediately receive relevant information about the alert, such as:

  • The location
  • Date and time
  • The PPV and dominant frequency in each axis

A more detailed description of the vibration alert is available by clicking Details. The Details page displays a Vibration Alert Report showing the vibration waveform in each axis and a compliance chart that plots the PPV and zero crossing frequency of each vibration cycle that can be used to assess the impact for structural damage or complaints. Compliance charts may be selected from a range of common international standards.

Use the Comment Box to make notes about the alert and the investigation, which can then be applied and stored for later reporting. If noise monitoring is performed at the same time and location as vibration monitoring, a sound file will capture what is happening at the time of the vibration exceedance. Click on the audio link (indicated by a music note symbol) to replay the audio. This setup provides a valuable source of input to identify causes. 

An example of a red Alert Box indicating an exceedance.An example of a red Alert Box indicating an exceedance.

Note that alerting is triggered from the measurement of Peak Particle Velocity in mm/s. Alerts may also be defined to take into account time of day, dominant frequency and PPV level. In this way only alerts likely to cause nuisance and/or structural damage will be brought to your attention, saving you valuable time.


Reporting Vibration Compliance

Example of a vibration compliance report generated by Noise SentinelExample of a vibration compliance report generated by Noise SentinelCommon throughout the Noise Sentinel solution suites is the ability to produce graphical and tabular reports showing actual measured data against compliance limits. Vibration compliance reports form part of the Noise Sentinel output file in conjunction with noise data, system performance (data completeness) and system setup parameters.

Two types of vibration data are recorded:

  • Vibration period showing continuous periodic vibration
  • Vibration alerts including data from each exceedance

The vibration period may be set to record continuously from every 15 minutes to every hour. As with noise, the periodic data is summarised to show the maximum level daily and for daytime, evening and nighttime periods. The dominant zero crossing frequency of the vibration peak is shown and colour-coded according to one of three user-defined frequency bands. This enables any issues to be seen at a glance. It is typically high-level, low-frequency vibration which causes the most concern.

Noise Sentinel’s Alert Data report – a summary of all vibration information during a measurementNoise Sentinel’s Alert Data report – a summary of all vibration information during a measurement

Fig. 4 shows a typical Noise Sentinel Alert Data report. This contains all the information provided for each vibration alert in the Real-time Control application, including any comments entered at the time of the alert. The report provides a complete record of vibration exceedances throughout the measurement.

 


Vibration Monitoring Hardware

The Instantel® vibration monitor system with triaxial geophoneThe Instantel® vibration monitor system with triaxial geophoneVibration monitoring is performed with an industry-proven vibration monitoring system from Instantel®. Thousands of these units have been deployed throughout the world and are compatible with both North American and European standards for vibration monitoring. When combined with noise monitoring, the vibration monitor is placed underneath the noise monitoring terminal and shares power and communications connections, simplifying installation and reducing operating costs. (Note that vibration monitoring does not have to take place at the same location as noise monitoring.)

The triaxial geophone is commonly bolted to a concrete foundation beneath the noise monitoring mast. Alternatively, spikes can be attached to the geophone to couple it securely, level to the ground, with the geophone just below the surface. The geophone is weather protected and needs no external enclosure to protect it.


Calibration

Noise Sentinel Ground Vibration Monitoring is contracted with calibration services designed to ensure minimal loss of monitoring time. These services include visits to each location by our specialized service team who perform preventative maintenance checks and acoustic calibration, and swap any vibration monitors with fully calibrated units. Monitors due for calibration are then removed and sent for calibration. The replacement of equipment on-site reduces measurement downtime to just a few minutes. A full preventative maintenance report is compiled and stored on the Noise Sentinel platform for reference and to show equipment is within calibration at all times. Depending on the number of locations, site visits may occur up to once every quarter.


Specifications

Full noise measurement and reporting specifications found in the Noise Sentinel Product Data BP 2389. When equipped with vibration monitoring units, Noise Sentinel has the following vibration specifications:

VIBRATION MEASUREMENT

Quantity: Peak Particle Velocity (PPV)

Range: Up to 254 mm/s (10 in/s)

Response Standard: ISEE Seismograph or DIN 45669–1

Resolution: 0.00788 mm/s (0.00031 in/s)

Accuracy: 

  • ISEE: +/–5% or 0.5 mm/s (0.02 in/s), whichever is larger, between 4 and 125 Hz
  • DIN: DIN 45669–1 standard

Frequency Range: 

  • ISEE: 2 to 250 Hz
  • DIN: 1 to 315 Hz or 1 to 80 Hz

VIBRATION ALERTS

Trigger: PPV from 0.13 to 254 mm/s

Advanced Trigger Parameters: Combine level with up to 4 frequency bands from <1 Hz to >10 Hz, Up to 4 periods per day

Sample Rate: 1 kHz or 2 kHz for DIN measurement to 315 Hz

Alert Recording: 1 to 5 seconds

VIBRATION REPORTING

Recording Interval: 1 to 60 minutes

Reporting Duration: 1 minute to 1 month

CALIBRATION

Calibration Interval: 12 months

PHYSICAL 

Dimensions: 25.4 × 11.75 × 10.80 cm (10 × 4.63 × 4.25″) 

Weight: 2.27 kg (5 lb) 

LCD Operating Temperature: –20 to +50°C (–4 to +122°F)

Electronics Operating Temperature: –40 to +50°C (–40 to +122°F)

COMPLIANCE TO STANDARDS

Vibration Standards: 

  • Vibration transducer complies with DIN 45669–1 or ISEE
  • Measurement is compliant with ISO 4866 for class 1 instrumentation (requires 8 kHZ sampling)
  • Peak Particle Velocity Compliance Reporting complies with DIN 4150, BS 6472 and others on request

Electrical: CE Class B (IEC 61000–4–2 to IEC 4–6 and IEC 4–11, 1994–1996)


Download the Product Data Sheet

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Brüel & Kjær Sound & Vibration Measurement A/S. P +45 77 41 20 00. F +45 45 80 14 05. info@bksv.com
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