IK0600020 - Determine Wheel Speed or Driveline Vibration using a Smart Phone and Fre... Page 1 of 6

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IK0600020

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PROP SHAFTS

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10/24/2017

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Title : Determine Wheel Speed or Driveline Vibration using a Smart Phone and Free VibSensor Application
Applies To : All Chassis

CHANGE LOG
Please refer to the change log text box below for recent changes to this article:
10/24/2017 - Initial Article Release

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DESCRIPTION
The use of a Smart Phone (Android or iPhone) application to identify a Wheel Speed or Driveline Vibration.

SYMPTOM(s)
Noticeable chassis vibration that can be validated during a test drive at a specific speed or speed range.

SPECIAL TOOL(s) / SOFTWARE
Most modern Smart Phones have a built in 3 axis accelerometer that is capable of recording vehicle vibrations from 1 - 50Hz
VibSensor Smart Phone Application is availalbe for both Android ( 4.1 or later) and Apple iPhone ( IOs 6.0 or later) ( No Cost - Free)
Application

Android - Google Play Apple ­ iPhone

Link to Google Play

Link to iTunes

Application Operation and Setup

Vehicle driver should follow all safe driving practices and laws . Do not operate your
smart phone while driving. If needed utilize a second person to operate the phone as
a passenger during the test drive.

Phone setup before test drive :

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1. The phone with the installed application should lay flat on a hard flat surface in the cab of the truck .Either the Dash or Floor will work for most
vibrations.
2. Always place the phone flat with the top of the phone facing forward ( toward windshield) Figure 1 and Figure 2

Figure 1: Phone on Dashboard

Figure 2: Phone Stick Dash Pad

Phone must be laying flat with the
top of the phone facing forward
( toward windshield)

If the surface will not retain the phone
during a test drive you should use a
phone Sticky Dash Pad or other
rubber mat as shown.

VibSensor application setup before test drive :
1. Open the VibSensor application . Figure 3
2. Test the phone and application on this screen by tapping the phone in all three directions and the X, Y and Z axis colored dots will change according to
the velocity and direction of the tapping. Figure 3
X Axis = Left and Right
Y Axis = Forward and Backwards
Z Axis = Up and Down
3. Tap on Acquire at the bottom of the Main Screen Figure 3
4. On the Acquire main screen tap the Title field and enter the VIN and details of the vibration such as speed that the vibration peaks. Figure 4
5. Leave both the Delay at 0:00 Minutes and the Duration at 01:00 Minutes Figure 4
6. The Start button at the bottom will start the recording . Only record during the test drive and while the vibration is occurring. Figure 4

Figure 3: Main Screen

Figure 4: Acquire Screen

You can test the phone and
application on this screen by tapping
the phone in all three directions and
the X, Y and Z axis colored dots will
change according to the velocity and
direction of the tapping.

1. Tap the Title field and enter a valid
name for this test
2. Delay - Leave this at Default of 0.00
3. Duration - Leave this at 1:00 minute
4. Click the Start Button to record during
the vibration and test drive.

Using VibSensor application during a test drive :

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1.
2.
3.
4.
5.
6.
7.

Test drive the vehicle on a flat smooth road if possible.
Verify that the vibration can be felt . Document the speed that the vibration begins, peaks and possibly ends .
Example would be a vibration that begins at 45MPH and peaks at 52MPH and ends at 60MPH.
Drive the vehicle at a steady speed where the vibration peaks and have a passenger tap the Start button #4 on the VibSensor Acquire Screen . Figure 5.
Continue driving at this steady speed until the 1.00 minute timer stops the recording .
The test file will automatically save when the recording stops .
You can take multiple recordings by following the same steps above.

Figure 5: Acquire Screen

Figure 6: Acquire Recording

4. Tap Start to begin recording

1. Mode ­ Collecting
2. Recording time

Reviewing the data recorded using VibSensor Application :
1. Tap the ViewData button at the bottom of the screen. Figure 7
2. The recordings are grouped by Date. Figure 7 Tap the date to expand.
3. Recordings on this screen are listed by time of day. Tap the recording to open. Figure 8

Figure 7:View Data Screen / Date

Figure 8: View Data Screen / Time

1.Tap View Data Button
2. Grouped recording by date .
3. Number of recordings on this date.
Tap to expand

1. Tap Time to analyze recording

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Analyzing the data recorded using VibSensor Application :
1.
2.
3.
4.
5.

As shown below there are several examples of recorded vibrations.
The Resonances section will be used to compare the dominant Vibration in Hz against the Component Speed 1st Order Calculator below this section.
1st Sample below Figure 9 has the 3 Axis Resonances ( vibrations)
The first number is the primary most dominant ( power density) vibration for that specific axis
The number in the ( ) is the calculated power density ( A numeric scale of the amount of power - magnitude . The higher the number the greater the
vibration magnitude)
6. The second number is the second most dominant ( power density) vibration for that specific axis . We will not use the second number for comparison.
7. Find the highest power density ( magnitude) number and axis and compare this reading in Hz to the Component Speed 1st Order Calculator below this
section.
Reading from Example below : Z Axis has the dominant vibration of 28 Hz power density of (12).
X: 0.19 Hz (1.7), 28 Hz (1.2)
Y: 28 Hz (2.3), 7.6 Hz (0.16)
Z: 28 Hz (12), 46 Hz(0.57)

Figure #9: Example Data Analyzed
1: Z Axis has the dominent vibration of 28 Hz
power density of (12).

Comparing vibration recorded values with the Component Speed Calculator.
1st Order Vibrations:
1. First (1st) order vibration is a vibration of a spinning component with One shake per revolution of the component .
2. Second(2nd) order vibration is a vibration of a spinning component with Two shakes per revolution of the component .

Order Component

Description /Possible Solutions

Speed/
Frequency

1st

One shake per revolution of a component turning the speed of the prop shafts.
Driveline ( Prop
50 - 65 MPH
Check for out-of-round or out-balance drive shafts, worn u-joints or flanges, loose
shafts)
26­ 31 Hz
output and input flanges and shafts.

1st

Wheel End
( Tires)

2nd

Driveline ( Prop Two shakes per revolution of a component turning the speed of the prop shafts.
shafts)
Check for correct U­joint working angles and worn u­joints

50 - 65 MPH
52­62Hz

2nd

Wheel End
( Tires)

50 - 65 MPH
12 ­ 18 Hz

One shake per revolution of the tire/wheel assembly. Check for out­of­round tires 50 ­ 65 MPH
and rims or out-of-balance tires, rims, brake drums or hubs.
6 - 9 Hz

Two shakes per revolution of the tire/wheel assembly. Check for out-of-round
tires and rims or out­of­balance tires, rims, brake drums or hubs.

Example:

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Figure #10: Example Data Analyzed
1: Z Axis has the dominent vibration of
28 Hz power density of (12).
1. Using the recording from above there is a dominant vibration at 28Hz on the Y and Z Axis .
2. This vibration peaked at 54 MPH .
3. Enter the following in the Calculator below
Min Vehicle Speed MPH = 50
Max Vehicle Speed MPH = 60
Rear Axle Ratio = 3.70
Rear Tire Revs/Mile = 502
1.
2.
3.
4.
5.
6.

Compare the Recorded Dominant Vibration of 28 Hz to the Driveline1st Order column .
Look for the matching vehicle speed and vibration in Hz.
At 54 MPH the calculated Driveline 1st Order is at 27.86Hz which matches the recorded value of 28Hz (rounded) .
This is the Source of this 1st order Driveline Vibration. Driveline Balance or Runout is the most probable cause.
If the recorded Dominant Vibration was at 8Hz then the comparison to the Tire 1st Order column would show at 54 MPH at 7.53 Hz.
1st order Tire Wheel End Vibration is usually caused by runout or balance issues.

Tire and Driveline Component Speed Calculator
1. Obtain the vehicle Rear Axle Ratio from the Service Portal > Vehicle Information Page> Details. ( Make sure to include a decimal point: example - 3.55)
2. Obtain the Rear Tire Revolutions per Mile ( Revs/Mile) from the Sales Data Component book by tire model and size or use the calculator and chart in
IK2600052
3. Enter the min/max vehicle speed in MPH of the recorded vehicle vibration, the rear axle ratio and the rear tire revs/mile.
4. Click the calculate button to display the Tire and Driveline 1st Order Speed in Hz. Yellow Columns
5. Compare the Dominant Vibration from recorded vibration to the calculated 1st Order chart below to determine the component that is generating the
vibration.
IK2600052 Title: Calculating Pulses Per Mile - includes online calculator
CT400 Sales Data Components Sales Data Tire Only Book
Minimum Vehicle Speed
Maximum Vehicle Speed
Rear Axle Ratio
Rear Tire Revs/Mile
Calculate
Vehicle Speed (mph)

Tire Speed (RPM)

Tire 1st Order (Hz)

Driveline Speed (RPM)

Driveline 1st Order (Hz)

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WARRANTY INFORMATION
Warranty Claim Coding:
Refer to the Warranty Coding Manual for Group and Noun Codes.

Standard Repair Time(s):
Refer to the SRT Manual for Repair Times

OTHER RESOURCES
Master Service Information Site

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Copyright © 2017 Navistar, Inc.

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