Equipment diagnosis system

• US 5,533,413 A
• Filed: 06/01/1995
• Issued: 07/09/1996
• Est. Priority Date: 06/30/1994
• Status: Expired due to Term

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.), Yokogawa Electric Corporation
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.), Yokogawa Electric Corporation
• Inventors: Tanabe, Shin, Wani, Moriyuki, Miyazawa, Masazumi, Kobayashi, Yasunori, Fukuda, Tatsuo, Imai, Hideki
• Primary Examiner(s): Chilcot, Richard
• Assistant Examiner(s): Noori, Max
• Application Number:
  US08/456,968
• Time in Patent Office: 404 Days
• Field of Search: 73/865.9, 73/117.3
• US Class Current: 73/865.9
• CPC Class Codes: G05B 23/0283 Predictive maintenance, e.g. involving the monitoring of a system and, based on the monitoring results, taking decisions on the maintenance schedule of the monitored system; Estimating remaining useful life [RUL] preventive maintenance, i.e. planning maintenance according to the available resources without monitoring the system G06Q10/06
• CPC Class Codes: G07C 3/00 Registering or indicating the condition or the working of machines or other apparatus, other than vehicles

Abstract

An equipment diagnosis system for diagnosing the functional state, the deterioration state, the remaining life time state, etc, of various equipment, and comprising an equipment state model portion for modelling the state of a diagnosis target equipment and for outputting information of the functional state, deterioration, remaining life time, etc, of the diagnosis target equipment on the basis of input information; stress information supply means for supplying the equipment stage model portion with appropriate information on stress which is applied to the diagnosis target equipment; comparison means for comparing information outputted from the equipment state model portion with information which is obtained on the basis of an actual maintenance result; and model correction means for correcting a parameter of the equipment state model portion on the basis of the comparison result.

Claims

1. An equipment diagnosis system for managing equipment, comprising:

a deterioration model portion for modelling a deterioration state of a management target equipment and for outputting information of remaining life time of said management target equipment on basis of input information;

stress information supply means for supplying said deterioration model portion with at least information on stress applied to said management target equipment; and

simulation means which is supplied with remaining life time information from said deterioration model portion and for supplying said deterioration model portion with virtual stress information according to a selected plan, to perform simulation, whereby an operation state of said management target equipment is altered on basis of remaining life time information obtained by said simulation means.

2. The system of claim 1, further comprising model correction means for correcting a parameter of said deterioration model portion on basis of comparison between output information from said deterioration model portion and an actual maintenance result of said management target equipment.

3. The system of claim 1, wherein said deterioration model portion comprises a plurality of deterioration modules, each of which is provided for each of a plurality of parts constituting said management target equipment, and which collectively determine a plurality of remaining life time information outputted from said plurality of deterioration modules to output remaining life time information of said management target equipment, and wherein said stress information supply means supplies information on stress to at least one of said plurality of modules, and wherein said simulation means alters the stress information to be supplied to said plurality of deterioration modules.

4. The system of claim 1, wherein said deterioration model portion comprises a plurality of deterioration modules, each of which is provided for each of a plurality of parts constituting a management target equipment, and collectively determine a plurality of remaining life time information outputted from said plurality of deterioration modules to output remaining life time information of said management target equipment, and wherein one of said plurality of deterioration modules is supplied with information on operation time and outputs remaining lifetime information based on said operation time.

5. An equipment diagnosis system comprising:

an equipment state model means for preparing a model of a state of a diagnosis target equipment, and for producing output information of a condition of said diagnosis target equipment;

means for supplying information on desired criteria of said diagnosis target equipment to said equipment state model means;

stress information supply means for supplying to said equipment state model means information on stress applied to said diagnosis target equipment, so that said equipment state model, utilizing said information on said desired criteria, said information on stress, and said model, produces said output information;

comparison means for comparing said output information from said equipment state model means with information on actual measurement of said diagnosis target equipment to thereby produce a comparison result; and

model correction means for receiving said comparison result from said comparison means and responsive thereto for correcting a parameter of said equipment state model means.

6. An equipment diagnosis system comprising:

an equipment state model portion for modelling a state of a diagnosis target equipment and for outputting information of a condition of said diagnosis target equipment to be diagnosed on the basis of input information;

stress information supply means for supplying said equipment state model portion with at least information on stress which is applied to said diagnosis target equipment;

comparison means for comparing information outputted from said equipment state model portion with information which is obtained on the basis of an actual measurement and for producing a comparison result; and

model correction means for correcting a parameter of said equipment state model portion on the basis of said comparison result produced by said comparison means;

wherein

said diagnosis target equipment controls fluid, and wherein

said stress information supply means supplies said equipment state model portion with an integration value of slurry concentration of said fluid as information which is related to stress applied to said diagnosis target equipment, and wherein

said equipment state model portion is designed to satisfy the following equation;

space="preserve" listing-type="equation">Y=-aX.sup.2 +b

wherein 0≦

X≦

√

(b/a);

Y represents remaining body thickness of said diagnosis target equipment;

X represents an integration value of slurry concentration flowing through said diagnosis target equipment; and

a and b represent coefficients which are determined on basis of management information and experience with said diagnosis target equipment.

7. An equipment diagnosis system comprising:

an equipment state model portion for modelling a state of a diagnosis target equipment and for outputting information of a condition of said diagnosis target equipment to be diagnosed on the basis of input information;

stress information supply means for supplying said equipment state model portion with at least information on stress which is applied to said diagnosis target equipment;

comparison means for comparing information outputted from said equipment state model portion with information which is obtained on the basis of an actual measurement and for producing a comparison result; and

model correction means for correcting a parameter of said equipment state model portion on the basis of said comparison result produced by said comparison means;

wherein

said diagnosis target equipment comprises a rotating portion, wherein

said stress information supply means supplies said diagnosis target equipment with a vibration signal as information representing stress, and wherein

said equipment state model portion is designed to satisfy the following equation;

space="preserve" listing-type="equation">Y=α

(X-a).sup.2 +b

wherein 0≦

X≦

a;

Y represents level of vibration signal;

X represents remaining life time of said diagnosis target equipment; and

α

, a, and b represent coefficients which are determined on basis of management information and experience with said diagnosis target equipment.

8. An equipment diagnosis system for managing equipment, comprising:

a deterioration model portion for modelling a deterioration state of a management target equipment and for outputting information of a remaining life time of said management target equipment on basis of input information;

stress information supply means for supplying said deterioration model portion with at least information on stress applied to said management target equipment; and

simulation means which is supplied with remaining life time information from said deterioration model portion and for supplying said deterioration model portion with virtual stress information according to a selected plan, to perform simulation, whereby an operation state of said management target equipment is altered on basis of remaining lifetime information obtained by said simulation means;

wherein

said simulation means comprises means for checking whether the following conditions are satisfied when alteration of an operation state is instructed on basis of simulation results;

(a) whether a production plan is still satisfied even when a current value of an operation load of said management target equipment is altered to a new operation load value which is obtained on basis of a simulation result, and (b) whether other equipment are not affected when operation load is altered from said operation load value to a new operation load value; and

means for notifying an operator that current operation load is altered from a current operation load value to a new operation load value after checking operation.