Expert Vibration Monitoring Solutions

GEA System New solution for vibration monitoring in civil engineering

Via Castelfidardo, 11 - 35141 PadovaTel 049 2021144 - Fax 049 2021143www.zetalab.it - e-mail: info@zetalab.it

Distribuito da:Zetalab s.r.l.

Introduction

GEA system Starting from a single Low Noise MEMS digital sensor, SEQUOIA IT is moving fast in order to bring the most FLEXIBLE, MODULAR and AFFORDABLE solution to the market to cover the need of vibration measurement and monitoring within the civil engineering market:

Just connect the GEA to your PC For QUICK and EASY site survey.

Transform the carring case into a Monitoring Box For LONG, UNATTENDED monitoring session.

Deploy a Multisensor Monitoring system Just use an USB HUB instead of expensive dedicated front-end

Data are suitable for Modal Analysis For those who need to understand the dynamic beahviour of structures

The sensor

GEA sensor integrates within one single unit a tri-axial low noise MEMS sensor, the 24 bit Sigma Delta A/D converter and appropriate signal conditioning.

Direct connection to a PC via USB, without needing an acquisition system

The external case is built within a very robust, rugged, anodized alluminium case. Full IP68 (5 bar of pressure) it’s able to withstand the most demanding enviromental conditions

Digital trasmission along the cable eliminates any EMC noise, even with extremelly long distances (up to 1km)

Conform to DIN 45669-1 the sensor is always delivered with its own calibration certificate.

All basic mounting accessories always included in the system

The software

GEA-Lab is the software that manages data acquisition and analysis.

It is build in order to fullfill the main measurement standards within civil vibration testing:

DATA RECORDING For post-processing or advanced analyis needs

STRUCTURAL DAMAGE Conforms to DIN 4150-3 and international standards

HUMAN COMFORT Conforms to DIN 4150-2, ISO 2631 and other international standards

The software

User Interface • Intuitive

• Drives user to easy setup measurement parameters

• Custom metadata to describe the measurement

• Built upon standards

Structural damage

Full database of National and International standards:

• UNI 9916 (Italy, 2004)

• DIN 4150-3 (Germany, 1999)

• BS 5228 (England, 1997)

• BS 7385 (England, 1992)

• SN 640312 (Switzerland, 1992)

• UNE 22381 (Spain, 1993)

• Circulaire du 23/07/1986 (France, 1986)

• ÖNORM S 9020 (Austria, 2014)

Indipendedent curve selection per sensor in multi-sensor system

Structural damage

Real-time velocity signals Continuous information:

Peak velocity on the three

axes

Event: time history and FFT

Comparison with the

desired reference curves

Human comfort

Main standards for human comfort evaluation already included into the system:

• UNI 9614 (Italy, 1990)

• UNI 11048 (Italy, 2003)

• ISO 2631-1 (International, 1997)

• ISO 2631-2 (International, 2003)

• DIN 4150-2 (Germany, 1999)

Human comfort

Real-time filtered

acceleration signals

Continuous information: maximum velocity on the three axes

RMS, Peak, Kbf and other

parameters visualization

Raw data subsampling

Raw data are managed in a dedicated utilities able to:

• Select the desired subsampling

• Merge two or more files together

• Export the raw data in .txt files

Raw data can be used for post-processing studies like modal analysis.

Possible GEA installations

Single GEA, direct connection to PC Fast & Easy site survey

Monitoring Box for single GEA system Long Term Unattended Monitoring

Multiple GEA connected to PC with USB HUB COST-EFFECTIVE setup of multichannel measurement system

Multiple GEA connected to PC with Sync HUB As before, plus accurate phase match and long cabling

Monitoring Box for multiple Sensor Long term unattended monitoring with advanced functionalities

Quick measurements

Single-point measurement

QUICK and EASY site survey

Quick way to define right measurement points during multisensor system setup

Possibility to select the measurement duration

Raw data extraction

The lowest-cost solution to install multisensor measuring Systems

Multiple-point measurement

Sync Hub

• Connection and Synchronization of up to 4 Sensors

• Use of estension cables up to 1 km

• It can be daisychained with other units to increase the number of sensors

• It can be used with laptop or monitoring box

It is ideal for tunnels and big structures

2 km

The monitoring boxes for long monitoring

For long unattended monitoring, a monitoring box is provided. There are two types of monitoring boxes:

• one dedicated to a single sensor

• one able to manage up to 16 sensors simultaneously.

The monitoring boxes

The monitoring boxes are: • fully IP65 • easiy transportable • operating in wide temperature range

(-10 to 60° C), • DC powered (12-24 V), and it can be

connected to main power, external battery and/or solar pannels.

The external communication available are: - LAN - WiFi - GPRS

Usable as a normal data recorder, they have unbeatable memory capacity compared to standard instruments.

Monitoring options

Mailing

During the monitoring the user can select many email addresses where the software sends automatically three types of notices:

• Daily check of the system status

• Alert when the user-defined threshold or a desired reference curve (form the main international standard directives) is exceeded

• Information about the velocity peak (logging information)

Scheduling

The user can choose to start and stop the monitor manually or automatically at a desired time, for example from March 3rd at 9:00 to June 16th at 18:00. Moreover, the user can select the number of schedules in a day.

Relay alert

A USB relay can be connected to the box, to control external devices like a gyrophare, which is activated automatically in case of an event.

Remote control

The monitoring boxes can be accessed remotely by means of off-the shelf pc-based technologies. In particular, you can:

• Access the GEA-Lab software inside the monitoring box

• Download the whole measurement folder in the personal laptop

In this way, you are completely able to manage the monitoring from your office, without needing to be present in case you want to stop the monitoring or to change configuration parameters.

Personal office Monitoring site

Excel reports: structural damage

GEA Event Report, with the time and frequency information related to a specific event, and the comparison with the standard curve

GEA Logging Report, with the logging information (velocity peaks) about the measurement or the schedule selected

Excel reports: human comfort

GEA Event Report, with the time histories related to a specific event

GEA Logging Report, with the logging information (acceleration peaks and RMS) about the measurement or the schedule selected

Modal test with GEA system

Modal test on our factory balcony

Configuration with 7 sensors distributed along the balcony and connected to a monitoring box

We used pedestrian walking as excitation and OMA (Operational Modal Analysis) algorithms to analyze data with Matlab scripts.

Considering the short time we dedicated (less than 15 minutes to setup the system and acquire the data), we have been able to clearly identify the first two mode shapes of the structure.

Second mode @ 50.50 Hz First mode @ 42.16 Hz

Long-term multiple-point monitoring

GEA system has been selected for the vibration monitoring within a big project in the North-East of Italy, involving the monitoring of a dam; a derivation tunnel and a new tunnel under construction.

15 GEA are installed and two monitoring boxes are used, one in a container and one close to a well.

Long-term multiple-point monitoring

The work supervision wants to understand which is the maximum amount of explosive than can be used in each blast, during the construction of the new tunnel, in order not to damage the surrounding structures.

Seven GEA accelerometers have been placed inside small boxes with IP68 epoxy and installed in the walls of a cavern which has been successively filled of 50 meters of water (5 bar of pressure).