Method and apparatus for analyzing a drivetrain assembly
First Claim
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1. A method for identifying a torsional mode of a vehicle having a torque generator, said method comprising the steps of:
- activating said torque generator, thereby causing a portion of said vehicle to vibrate;
providing a controller;
measuring said vibration of said portion of said vehicle;
generating a signal having a reciprocating and a random portion in response to said measured vibration;
causing said controller to discern and remove said reciprocating causing said controller to produce at least one modal parameter by providing a natural excitation technique and applying said natural excitation technique to said random portion; and
causing said controller to identify said torsional mode by analyzing said at least one modal parameter.
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Abstract
A method and an apparatus 10 for determining or identifying the torsional modes of a portion of a vehicle 12, such as a drivetrain assembly including a crankshaft 14, a driveshaft 16, a transmission assembly 18, and axles 24, 26. The torsional modes are discerned by use of the torque generator 14 such as an internal combustion engine, which is normally and operatively disposed within the vehicle 12, thereby obviating the need to replace the internal combustion engine 14 with a dynamometer and/or other type of signal generator assembly.
11 Citations
6 Claims
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1. A method for identifying a torsional mode of a vehicle having a torque generator, said method comprising the steps of:
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activating said torque generator, thereby causing a portion of said vehicle to vibrate;
providing a controller;
measuring said vibration of said portion of said vehicle;
generating a signal having a reciprocating and a random portion in response to said measured vibration;
causing said controller to discern and remove said reciprocating causing said controller to produce at least one modal parameter by providing a natural excitation technique and applying said natural excitation technique to said random portion; and
causing said controller to identify said torsional mode by analyzing said at least one modal parameter. - View Dependent Claims (2, 3, 4, 5, 6)
providing a conditional source analysis technique; and
applying said conditional source analysis technique to said signal.
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Specification
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Current AssigneeFord Global Technologies, LLC (Ford Motor Company)
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Original AssigneeFord Global Technologies, LLC (Ford Motor Company)
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InventorsCheng, Ming-Te
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Primary Examiner(s)MCCALL, ERIC SCOTT
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Application NumberUS09/682,973Publication NumberTime in Patent Office589 DaysField of Search731/16, 731/172, 731/173, 731/181, 701/29US Class Current73/115.01CPC Class CodesG01M 13/02 Gearings; Transmission mech...
