Portable vibration monitor

• US 6,006,164 A
• Filed: 07/22/1997
• Issued: 12/21/1999
• Est. Priority Date: 07/22/1997
• Status: Expired due to Term

• Current Assignee: SKF USA Incorporated (SKF)
• Original Assignee: SKF Condition Monitoring Inc
• Inventors: McCarty, William A., Thompson, Steve, Calderwood, Bryan, Drury, Jerry
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): VO, HIEN XUAN
• Application Number:
  US08/898,678
• Time in Patent Office: 882 Days
• Field of Search: 702/56, 702/182, 702/188, 702/197, 702/184, 702/33, 364/138, 364/140.07, 73/660, 73/661, 73/570, 73/659, 73/79, 73/593, 73/644
• US Class Current: 702/56
• CPC Class Codes: G01D 9/005 Solid-state data loggers
• CPC Class Codes: G01H 1/00 Measuring characteristics of vibrations in solids by using direct conduction to the detector G01H9/00, G01H11/00 take precedence
• CPC Class Codes: G01H 1/003 of rotating machines G01H1/10 takes precedence
• CPC Class Codes: G01M 13/028 Acoustic or vibration analysis
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis
• CPC Class Codes: G10K 11/18 Methods or devices for transmitting, conducting or directing sound G10K11/02, G10K11/36 take precedence
• CPC Class Codes: H02K 11/20 for measuring, monitoring, testing, protecting or switching rectifiers H02K11/04; power electronics H02K11/33

Abstract

A portable vibration monitoring probe is provided which comprises a housing, a probe and a transducer is provided. An analog to digital converter is coupled to the transducer output. The vibration monitor comprises an interface configured to transmit digital data comprising vibration parameters derived from the digitized analog signal to processing circuitry external to the housing. In some embodiments of the present invention, vibration monitors may be configured to store information in a memory located near the measuring point.

Claims

1. A portable vibration monitor, comprising:

a housing;

a probe;

a transducer coupled to said probe, wherein said transducer is substantially enclosed within said housing, and wherein said transducer has as an output an analog signal representative of vibrations present in a piece of vibrating machinery contacted by said first portion of said probe;

an analog to digital converter coupled to said output of said transducer, and configured to digitize said analog signal;

a processing circuit configured to receive said digitized analog signal and to produce digital data comprising a value indicative of the degree of bearing wear derived from said digitized analog signal, and

an interface circuit configured to receive said digital data from said processing circuit and to transmit said digital data to a device external to said housing while said processing circuit is producing additional digital data for transmission.

2. The monitor of claim 1, wherein said at least one vibration parameter comprises velocity.

3. The monitor of claim 1, wherein said at least one vibration parameter comprises enveloped acceleration.

4. The monitor of claim 1, wherein said vibration parameter comprises a frequency domain spectrum.

5. A method of monitoring the condition of a machine, comprising the steps of:

storing data indicative of bearing service history or bearing assembly in a memory located proximate to a measuring point on a machine;

mechanically coupling a transducer to said measuring point;

processing an output of said transducer to produce data indicative of one or more characteristics of vibrations of said machine; and

storing said data indicative of one or more characteristics of vibrations of said machine in said memory.

6. The method of claim 5, additionally comprising the step of subsequently retrieving said data from said memory.

7. The method of claim 5, additionally comprising the step of storing data indicative of the date said vibration characteristics data of said machine was acquired.

8. A handheld probe for monitoring the condition of machines, said handheld probe comprising:

a housing;

a piezoelectric transducer within said housing;

electrical circuitry within said housing comprising a circuit common reference point;

a metal probe comprising a coupler for connecting to a stud located at a measuring point on a machine, wherein said metal probe is mechanically coupled to said piezoelectric transducer and electrically coupled to said circuit common reference point; and

a metal contact located proximate to said metal probe, said metal contact coupled to said electrical circuitry so as to transmit electrical signals between said electrical circuitry and one or more devices external to said housing, whereby both an electrical and mechanical coupling between the stud at the measuring point is made when said metal probe is connected to said stud.

9. The handheld probe of claim 8, wherein said metal probe comprises a threaded portion adapted for 1/4 turn engagement with a probe receiving location on the machine.

10. The handheld probe of claim 9, wherein said threaded portion comprises double start threads.

11. An interface between a vibration measuring point on a machine and a digital data processor, said interface comprising:

a portable, handheld housing;

a probe having a first portion external to said housing which is configured to mechanically couple to said vibration measuring point, said probe additionally comprising a second portion coupled to a vibration transducer;

a circuit in said housing translating an analog electrical signal output from said transducer into digital data;

wireless communication circuitry within said housing receiving said digital data, and for wirelessly transmitting said digital data in approximately real time to the digital data processor for further processing.

12. A method of monitoring the condition of a machine, the method comprising the steps of:

contacting a measuring point on said machine with a portable probe comprising a vibration transducer;

converting an output of said transducer to first data indicative of one or more characteristics of vibrations of said machine; and

,

electronically evaluating said data for characteristics associated with a stable data reading by determining the rate of change of the value of said data.