testing and implementation of a fatigue monitor system … bartlett fatigue... · connecting the...
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Connecting the World
Testing and Implementation of a Fatigue Monitor System for Haul
Truck Operators
Mark W Bartlett, Ph.D.
Program Objectives
Identify and implement a tool for haul truck drivers that:- Reduces or eliminates fatigue-related injuries and
fatalities- Reduces accidents and equipment damage
Following evaluation period, apply tool where most effective
Why do We Need a Fatigue Monitoring Tool?
Everyone has probably fallen asleep while drivingDriver fatigue is a major source of property damage and serious haul truck serious incidentsTo protect ourselves from the other “tired” driverTo know when to ask for reliefTo know when we are seriously distracted from drivingTo measure improvements in sleep incidents based on shift changes and interventionTo help prevent incidents like the following:
Probable Fatigue Accidents
Known Fatigue Accidents
Large Equipment Statistics High Altitude Mine 2006-2009
128
17
131
22
109
20
96
18
0
15
30
45
60
75
90
105
120
135
2006 2007 2008 2009
HE Acc. vs Sleepy Acc.
Total Eqp Acc. Total Sleeping Acc.
Accident Times
0
2
4
6
8
10
12
14
16
18
23-2
4
24-1 1-2
2-3
3-4
4-5
5-6
6-7
7-8
8-9
9-10
10-1
1
11-1
2
12-1
3
13-1
4
14-1
5
15-1
6
16-1
7
17-1
8
18-1
9
19- 2
0
20-2
1
21- 2
2
22-2
3
Sleepy Acc. - TimeJan 2006 - 27 Nov 2009
8
The DSS Technology
The Technology
Cat 793 Installation
The Technology
1. Microsleeps > 4 mph / 2.0s
2. Distraction > 14 mph / 6.0s
Cab Integration
DSSAudio Warning
Sensor
Microsleep Detection
Drowsy Eyes
Driver
Seat Vibration
Supervisor Integration
DSS
Microsleep
DriverDispatcher/Supervisor
Intervention
Wireless Communications
MicrosleepEventDisplay
Data Server
13
The DSS Technology
Safford Data
Fatigue Events by Hour of Day n
Hour of Day
Hour 1 = 1:00 AM –
1:59:59 AM
Speed (mph)
Fatigue Events Frequency by Speed
n = 3,286
n = 3,286
Longitude, East
GPS Location of Fatigue Events
Distraction Events (11/23/09 - 4/11/10)
0
100
200
300
400
500
600
700
800
900
1000
Count
Week
Event Count by Weekn = 9,607
Alarms were turned off from the evening of January 2nd
through Feb 26th.
0
12
345
678
Seco
nds
Date
Average Distraction Duration Over Timen = 9,607
People
Technology Process
Change Management Plan
TechnologyTest to make sure it works
False positives/eye glass interference
Work with IS to get real-time info Trial with supportive mine site
ProcessDesign real-time intervention planAssign roles & responsibilitiesAnticipate problems & responses
PeopleComplete stakeholder analysisFormulate communications planSite management commitmentTell operators everything Do what we say we are going to do
Success
People – Communicated Message
We want everyone to go home to their family wholeDriver fatigue is a major source of property damage and serious haul truck serious incidentsWe run 12-hour shifts 24/7, but what are the best/safest shift hours? - Need to measure to improve
Employees will not be fired for falling asleep while drivingOperators will be disciplined for tampering with deviceOperators may be disciplined for PPE violations
The Process
Intervention StrategyAsk operator to call dispatch if fatigue alarm soundsFirst two events handled by dispatcher and operatorPit supervisor involved at 3rd confirmed micro-sleep- Park up truck/conversation with driver- Put driver back on if alert; provide nap if needed
Any further confirmed events- Assign other work if necessary
Tampering with deviceDispatcher call to clear viewProgressive discipline process
PPE/Policy violationsProgressive discipline process
DSS
Micro-sleep
Dispatcher/Supervisor
Intervention
Wireless Communications
Micro-sleepEventDisplay
Legal, Safety & HR Concerns
Questions?Will MSHA approve and will they use our data against us?Expectations of privacy?Consistency in application of intervention process by supervisors?
AnswersProactive measure to improve employee safetyExperimental at this timeEmployee’s responsibility to remain alert and exercise sufficient motor skills, coordination, and mental attention to do the job safelyStrategy and procedures will be uniformly applied at all sites
Fatigue and Distraction Events(By Week, Normalized)
Both Alarms On
Distraction Alarms Off
Both Alarms
Both Alarms On + FMP ImplementedDistraction Threshold Raised
n = 3,286
Micro-Sleeps By Shift Rotation
Fatigue Monitor Results
Challenges – Tracking
Drivers cannot be tracked all the time- Tracking usually 60-80%
Why not?- PPE interference
- Dust masks & certain eye wear interfere- Short/Tall drivers- Driver movement in/out of FOV- High contrast AM/PM light- Facial hair- Cell phones/Personal entertainment devices- Tampering
Conclusions
The DSS system works most of the time for most operatorsProvides “virtual” driving buddy for the operatorCan provide site supervision near real-time notice of potential fatigued operatorsHighly effective if used with supervisor intervention procedureThe communications plan about the technology and how it will be used is criticalComplete management support and ownership of the process (from the mine manager to front-line supervisor)Your own test data is helpful (including the video clips) in showing other drivers the issueConsequences are clearly defined; do what you say you are going to doListen to complaints and fix issues/problems earlySite champions required
Conclusions
However
Not a Fatigue Management System, just one componentGPS dependent; no notification or alarm if GPS disabled or unavailableFacial hair, some safety glasses, and tampering will limit % of tracking
Questions?