Method for searching fault point in advance connection of hydraulic clutch

Abstract

The invention relates to the technical field of turbine starter hydraulic clutch troubleshooting tests, in particular to a hydraulic clutch advanced connection fault point searching method which comprises the steps that SS1, fault information is collected, and a hydraulic clutch advanced connection fault tree is drawn according to fault types; and SS2, according to the fault tree, carrying out a simulation test on an advanced connection fault of the hydraulic clutch, carrying out fault point troubleshooting on a fuel pump, the hydraulic clutch, a speed reducer and a left shell and a right shell of the hydraulic clutch one by one, and recording fault points. According to the method, troubleshooting simulation test, test method conclusion, fault tree drawing and one-by-one troubleshooting are performed on the advanced connection faults of the hydraulic clutch, so that the fault diagnosis accuracy is improved, excessive dependence on operator experience in troubleshooting analysis and positioning is reduced, repeated and disordered labor is avoided, the troubleshooting period and cost are reduced, and the fault diagnosis efficiency is improved. By making improvement measures, the test run verification effect is good, the fault occurrence rate is remarkably reduced, and the production delivery efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of troubleshooting test of hydraulic clutch of turbine starter, in particular to a method for finding out fault point of advance connection of hydraulic clutch. BACKGROUND

[0002] The hydraulic clutch is an important component for realizing that the starter drives the engine at a specified rotating speed, and driving the engine below the specified rotating speed is the advance connection fault, and the connection rotating speed is an important performance index in the test run of the starter.

[0003] When the starter works at the rotating speed, the spring sheet of the hydraulic clutch closes the oil drain hole, and mainly relies on the always-open hole to drain oil. After pressing the stop button, the gap between the spring sheet and the inner wall of the outer cover increases with the decrease of the rotating speed, the oil drain passage increases, the hydraulic clutch oil is thrown out from the oil drain hole by the centrifugal force, and the oil flows out of the oil drain hole by gravity after stopping rotating. If the oil drain hole flow of the inner surface of the outer cover of the hydraulic clutch is small, the hydraulic clutch cavity still has oil after the starter stops working. Since the hydraulic clutch is connected by relying on the oil in the cavity, under normal circumstances, when the rotating speed of the starter reaches the specified rotating speed, the oil is filled into the hydraulic clutch cavity to connect. If there is oil left in the hydraulic clutch cavity, it is equivalent to that the oil is filled into the hydraulic clutch in advance, which causes the hydraulic clutch to connect in advance.

[0004] The data shows that since the development, the advance connection fault is an old and difficult fault of the starter, the related factors of the fault are many, the difficulty of solving is great, and the fault is frequent. SUMMARY

[0005] In view of the problems in the prior art, the present application provides a method for finding out the fault point of advance connection of the hydraulic clutch.

[0006] The present application is realized by the following technical scheme: A method for finding out the fault point of advance connection of the hydraulic clutch, comprising: SS1, collecting fault information, and drawing a hydraulic clutch advance connection fault tree according to the fault type; SS2, performing simulation test on the hydraulic clutch advance connection fault according to the fault tree, and sequentially performing fault point checking on the fuel pump, the hydraulic clutch, the speed reducer and the left and right housings of the hydraulic clutch, and recording the fault points; after checking all the structures, if the fault point is not found, rechecking all the structures for the next time until the fault point is found.

[0007] Preferably, in SS2, the fault point checking on the fuel pump comprises: checking whether the fuel pump supplies oil in advance; if yes, recording the fault point X1; otherwise, checking the fault points of other structures.

[0008] Preferably, in SS2, the fault points of the hydraulic clutch are checked, including: S201, the internal structure of the hydraulic clutch is decomposed, whether there is an abnormal point of hydraulic clutch oil leakage not smooth, short test interval time is checked, and whether the abnormal point appears is verified to cause excessive oil; if it is related to the hydraulic clutch oil leakage not smooth, S202 is performed, otherwise S203 is performed; S202, whether the hydraulic clutch oil leakage not smooth is related to the elastic sheet valve is checked, if yes, record the fault point, and verify whether it causes the oil leakage not smooth; otherwise, whether the oil leakage not smooth is related to the size of the shell oil leakage hole or the clutch test flow is checked, if yes, record the fault point, and verify whether it causes the oil leakage not smooth, otherwise S203 is performed; S203, the hydraulic clutch test interval time simulation test is performed, the abnormal points appearing are checked and verified whether the interval time is related to the oil leakage not smooth, if yes, record the fault point X7, otherwise the fault point of other structure is checked.

[0009] Preferably, in S202, whether the hydraulic clutch oil leakage not smooth is related to the elastic sheet valve is checked, if yes, the fault point is recorded, including: whether the hardness of the elastic sheet is low is checked, if yes, record the fault point X2; whether the spring sheet arc diameter is large is checked, if yes, record the fault point X3; whether the spring elasticity is low is checked, if yes, record the fault point X4.

[0010] Preferably, in S202, whether the oil leakage not smooth is related to the size of the shell oil leakage hole or the clutch test flow is checked, if yes, the fault point is recorded, and whether it causes the oil leakage not smooth is verified, including: whether the oil leakage not smooth is related to the size of the shell oil leakage hole is checked, if yes, record the fault point X5; whether the oil leakage not smooth is related to the small clutch test flow is checked, if yes, record the fault point X6.

[0011] Preferably, in SS2, the fault points of the reducer are checked, including: S301, whether the reducer oil leaks into the clutch is checked: whether it is related to the poor sealing of the spherical surface is checked, if yes, S302 is performed, otherwise S303 is performed; S302, whether the reducer oil is related to the sealing of the spherical part is checked, if yes, record the fault point, otherwise S303 is performed; S303, whether the reducer oil is related to the cooperation gap of the hydraulic clutch oil discharge pipe and the gear shaft is checked, if yes, record the fault point X14, otherwise the fault point of other structure is checked.

[0012] Preferably, in S302, checking whether the reducer lubricating oil is related to the sealing of the spherical part includes: checking whether the spherical surface fitting degree is low, and if so, recording the fault point X8; checking whether the spherical surface contact width is small, and if so, recording the fault point X9; checking whether the spherical surface contact is poor, and if so, performing detailed inspection.

[0013] Preferably, checking whether the spherical surface contact is poor includes: checking whether the axial size of the spherical part deviates, and if so, recording the fault point X10; checking whether the spring mounting seat is not supported, and if so, recording the fault point X11; checking whether the elastic size performance deviates, and if so, recording the fault point X12; checking whether the static balance is not good and the vibration is large, and if so, recording the fault point X13, otherwise, other structure fault points are checked.

[0014] Preferably, in SS2, the left and right housings of the hydraulic clutch are checked for fault points, including: S401, checking whether the left and right housings of the hydraulic clutch are stuck, and if so, performing S402, otherwise, after the fault reason is ruled out, performing SS3; S402, checking whether the hydraulic clutch housing fitting size deviates, and if so, recording the fault point X15; otherwise, performing 403; S403, checking whether foreign matter enters the hydraulic clutch fitting surface, and if so, recording the fault point X16, otherwise, performing SS3.

[0015] Preferably, SS3 is further included, and corresponding measures are taken according to the recorded fault points to eliminate the fault.

[0016] Compared with the prior art, the present application has the following beneficial effects: The hydraulic clutch advance connection fault point finding method of the present application is aimed at the abnormal advance connection fault phenomenon in the working of the hydraulic clutch. By designing and implementing a fault elimination simulation test, effective test procedures and analysis steps are systematically summarized. Specifically, first, existing fault information is collected to construct a fault tree, and then according to the fault tree, step-by-step troubleshooting and cause positioning are carried out. In the fault elimination simulation test of the hydraulic clutch advance connection fault, the test method is summarized, the fault tree is drawn and checked one by one, and through the guidance of the structured fault tree, repeated detection and disordered operation commonly seen in the traditional fault elimination process are avoided, so that human errors can be reduced, and maintenance time and cost can be saved. According to the fault points checked, targeted improvement measures can be taken, and in the test process, the time for checking faults can be shortened, and test and delivery efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 The flow chart of the method for finding the fault point of the hydraulic clutch early connection; Fig. 2 The fault tree in the method for finding the fault point of the hydraulic clutch early connection. DETAILED DESCRIPTION

[0018] The application will be further described in detail below with specific examples, which are the explanation but not the limitation of the application.

[0019] The application discloses a method for finding the fault point of the hydraulic clutch early connection, referring to Figs. 1-2 , comprising: SS1, collecting fault information, drawing a fault tree of the hydraulic clutch early connection according to the fault type, the fault tree including the fault type, the fault cause and the corresponding measures.

[0020] The fault of the hydraulic clutch early connection includes the fuel pump early oil supply, the excessive oil accumulation in the hydraulic clutch, the gear oil seepage into the clutch in the reducer, and the left and right shell jamming fault of the hydraulic clutch.

[0021] The excessive oil accumulation in the hydraulic clutch includes the poor oil leakage of the hydraulic clutch, the short interval time of the test run.

[0022] The poor oil leakage of the hydraulic clutch includes the spring sheet valve problem, the small size of the oil leakage hole of the shell, and the small test flow of the clutch.

[0023] The gear oil seepage into the clutch in the reducer includes the poor spherical sealing and the large gap between the oil discharge pipe gear shaft.

[0024] The poor spherical sealing includes the poor spherical fitting, the small spherical contact width, and the poor spherical contact (the axial size deviation of the spherical part, the incorrect support of the spring mounting seat, the elastic size performance deviation, and the poor static balance and large vibration).

[0025] The measures taken for the fault point are: selecting the spring sheet with a larger elastic coefficient, reducing the spring sheet arc diameter tolerance range, and increasing the spring sheet gap to ensure the leakage amount of the outer cover.

[0026] SS2, performing the simulation test on the fault of the hydraulic clutch early connection according to the fault tree, checking the fault points of the fuel pump, the hydraulic clutch, the reducer and the left and right shells of the hydraulic clutch one by one, and recording the fault points, specifically: Checking the fault points of the fuel pump, including: checking whether the fuel pump supplies oil in advance; if yes, recording the fault point X1; otherwise, checking the fault points of other structures.

[0027] Checking the fault points of the hydraulic clutch, including: S201, decompose the internal structure of the hydraulic clutch, check whether there are abnormal points such as hydraulic clutch oil leakage, short test interval, and verify whether the abnormal points cause excessive oil accumulation; if it is related to hydraulic clutch oil leakage, proceed to S202, otherwise proceed to S203; S202, check whether the hydraulic clutch oil leakage is related to the elastic sheet valve, if yes, record the fault point and verify whether it causes the oil leakage; otherwise, check whether the oil leakage is related to the size of the shell oil leakage hole or the clutch test flow, if yes, record the fault point and verify whether it causes the oil leakage, otherwise proceed to S203; Among them, checking whether the hydraulic clutch oil leakage is related to the elastic sheet valve, if yes, recording the fault point, including: Check if the spring sheet hardness is low, if yes, record the fault point X2; Check if the spring sheet arc diameter is too large, if yes, record the fault point X3; Check if the spring elasticity is low, if yes, record the fault point X4.

[0028] Check whether the oil leakage is related to the size of the shell oil leakage hole or the clutch test flow, if yes, record the fault point and verify whether it causes the oil leakage, including: Check whether the oil leakage is related to the size of the shell oil leakage hole, if yes, record the fault point X5; Check whether the oil leakage is related to the small clutch test flow, if yes, record the fault point X6.

[0029] S203, simulate the test of the hydraulic clutch test interval, check the abnormal points and verify whether the interval is related to the oil leakage, if yes, record the fault point X7, otherwise proceed to other structure fault point checking.

[0030] Check the fault points of the reducer, including: S301, check whether the reducer oil leaks into the clutch: check whether it is related to the poor sealing of the spherical surface, if yes, proceed to S302, otherwise proceed to S303; S302, check whether the reducer oil is related to the sealing of the spherical surface part, if yes, record the fault point, otherwise proceed to S303; Among them, checking whether the reducer oil is related to the sealing of the spherical surface part, including: Check if the spherical surface fit is low, if yes, record the fault point X8; Check if the spherical surface contact width is small, if yes, record the fault point X9; Check if the spherical surface contact is poor, if yes, proceed to detailed check, including: Check if the axial size of the spherical surface part is deviated, if yes, record the fault point X10; Check if the spring mounting bracket is not properly supported. If so, record the fault point X11. Check if the elastic dimension performance deviates. If so, record the fault point X12. Check if the static balance is poor and the vibration is large. If so, record the fault point X13. Otherwise, check the fault points of other structures.

[0031] S303, check if the lubricating oil in the reducer has a large clearance between the hydraulic clutch drain pipe and the gear shaft. If so, record the fault point X14; otherwise, check for fault points in other structures.

[0032] Troubleshooting the left and right housings of the hydraulic clutch includes: S401, check if there is any jamming in the left and right housings of the hydraulic clutch. If so, proceed to S402; otherwise, after eliminating the cause of this fault, proceed to SS3. S402, check if the hydraulic clutch housing fit dimensions are off. If so, record the fault point X15; otherwise, proceed to 403. S403, check if any foreign objects have entered the hydraulic clutch mating surface. If so, record the fault point X16; otherwise, proceed to SS3.

[0033] If the fault cannot be found after checking all structures, the entire structure will be checked again until the fault is found.

[0034] SS3: Take corresponding measures to eliminate the fault based on the recorded fault points.

[0035] This invention discloses a method for locating faults related to premature engagement of hydraulic clutches. It involves conducting troubleshooting simulation tests on premature engagement faults in hydraulic clutches, summarizing the testing methods, drawing a fault tree, and systematically checking each fault. This method can scientifically and systematically identify the causes of premature engagement faults in hydraulic clutches quickly and efficiently. While improving the accuracy of fault diagnosis, it reduces excessive reliance on operator experience in troubleshooting analysis and location, avoids repetitive and disordered work, and reduces troubleshooting cycle and costs. Through the formulation of improvement measures, trial runs have verified its good results, significantly reducing the failure rate and greatly improving production delivery efficiency. This method is currently being applied in practical work.

[0036] The hydraulic clutch components of a certain starter were disassembled and inspected, and the relevant fault factors were investigated.

[0037] X1: Fuel pump delivers fuel in advance After the turbocharger starter hydraulic clutch engaged prematurely, the fuel pump oil supply signal was measured and found to be normal. Therefore, the premature clutch engagement fault is unrelated to the fuel pump.

[0038] (2) X2: The spring sheet has low hardness. Randomly selected 5 new spring piece to send material detection center measurement valve hardness, the measurement results are shown in Table 1, spring piece hardness qualified, this factor can be ruled out.

[0039] Table 1 spring piece hardness retest value

[0040] (3) X3: spring piece arc diameter is too large The spring piece arc diameter is measured by measuring tool. The retest object is the spring piece taken from the new hydraulic clutch without starter and the spring piece from the fault machine. The measurement results show that the spring piece arc diameter is large or small. Small arc diameter is beneficial to oil leakage, and the hydraulic clutch is not easy to connect in advance. Although the arc diameter of the spring piece from the two fault machines is small, the fault still occurs. Therefore, it is judged that the spring piece arc diameter size is not related to this fault.

[0041] (4) X4: spring piece elasticity is low The spring piece is clamped by a newly made tool at one end of the rivet hole, and the spring force value is measured on the spring force gauge when the other end is compressed at different amounts. The retest object is the spring piece from the fault machine and the spring piece taken from the new hydraulic clutch without starter.

[0042] Table 2 spring piece elasticity measurement value

[0043] As shown in Table 2, the spring piece from the fault machine has a lower elasticity coefficient than the new spring piece. The low elasticity coefficient causes the spring piece to be more easily attached to the hydraulic clutch shell or have a smaller gap with the shell under the action of centrifugal force during work, making it difficult for the hydraulic clutch to flow out, increasing the probability of failure. Therefore, the low elasticity coefficient of the spring piece is related to this fault.

[0044] (5) X5: Shell oil drain hole size is too small The size related to the size of the hydraulic clutch shell and oil drain passage is retested. The size is qualified, and this factor can be ruled out.

[0045] (6) X6: Hydraulic clutch cover leakage is too small The hydraulic clutch cover leakage is designed to meet the requirement of ≤90 cm3 / min. The leakage of the starter hydraulic clutch cover during the retest is greater than 90 cm3 / min. There is no phenomenon of small leakage, and this factor can be ruled out.

[0046] (7) X7: Test interval is short If the interval between two tests is short, the hydraulic clutch may not have completely drained the oil after the last stop, and the next test may be connected in advance due to the accumulated oil. The test record shows that the test operation meets the requirements, so the factor of short test interval can be ruled out.

[0047] (8) X8: Low spherical surface fit The spherical surface of the failed engine was checked by coloring. The coloring test showed that the coloring of the engine bush and the gear shaft spherical surface was qualified, but the coloring of the pipe and the bush was unqualified, the oil was likely to leak from the pipe and the bush. Therefore, this factor is not the main cause of the failure and can be excluded.

[0048] (9) X9: Spherical contact width is too small The adapter bush, intermediate gear and oil drain pipe were measured in sequence, and the test dimensions were qualified. This factor can be excluded.

[0049] (10) X10: Axial dimension deviation of parts with spherical surface The axial dimensions related to the position and compression of the oil drain pipe, adapter bush and intermediate gear on the starter hydraulic clutch were re-measured, and the measurement results were qualified. The axial dimension deviation of parts with spherical surface can be excluded.

[0050] (12) X12: Spring size and performance deviation Through re-inspection, it was found that the spring size was qualified, and this item could be excluded.

[0051] (13) X13: Static balance of hydraulic clutch left and right housings The static balance of the two rotating parts of the hydraulic clutch left and right housings of the failed engine was re-measured. The measurement of static balance was unqualified. During operation, due to vibration, the compression of the oil drain pipe and the adapter bush spherical surface, and the adapter bush and the intermediate gear spherical surface was unstable, which led to poor sealing of the spherical surface, and the oil entered the hydraulic clutch. However, from the detection process, the static imbalance was small, and this factor was not the main cause of the failure.

[0052] (14) X14: Large gap between oil drain pipe outer diameter and gear shaft inner hole The outer diameter of the oil drain pipe was re-measured, and the inner hole of the intermediate gear (gear shaft) was re-measured. The test results are shown in Table 3.

[0053] Table 3 Re-measured values of oil drain pipe outer diameter and gear shaft inner hole

[0054] As shown in Table 3, the oil drain pipe outer diameter is qualified, the roughness is qualified, and the intermediate gear hole diameter is qualified, so this factor can be excluded. Therefore, the gap between the oil drain pipe outer diameter and the gear shaft inner hole can be excluded.

[0055] (15) X15: Hydraulic clutch housing fit size deviation The assembly size of the hydraulic clutch housing before test run was rechecked (Table 4). The related fit sizes all meet the design requirements, and this factor can be excluded.

[0056] Table 4 Hydraulic clutch housing assembly size

[0057] (16) X16: foreign matter into the hydraulic clutch mating surface No wear of the hydraulic clutch mating surface was found by disassembly inspection, which can be ruled out.

[0058] For the fault caused by low spring plate elastic coefficient, the following measures are taken: Increase the spring plate elastic coefficient measurement and grouping, and control the spring plate arc diameter and thickness; the spring plates are grouped according to the elastic coefficient, and are stored in the warehouse, and are selectively matched during the assembly of the hydraulic clutch cover, so as to reduce the workload and ensure the reliability of the product.

[0059] The distribution range of the spring plate elastic coefficient is counted, the measurement requirements are improved, the appropriate spring plate is selected, the spring plate arc diameter tolerance range is narrowed, and the spring plate gap is increased, so as to facilitate the adjustment of the shell hydraulic test flow, and to exclude and prevent the premature failure of the starter hydraulic clutch.

[0060] The above only describes the preferred embodiments of the present application, and does not limit the technical solutions of the present application in any way. Those skilled in the art should understand that the technical solutions can be modified and replaced in several simple ways without departing from the spirit and principles of the present application, and these modifications and replacements also belong to the protection scope covered by the claims.

Claims

1. A method for locating faults caused by premature engagement of a hydraulic clutch, characterized in that, include: SS1 collects fault information and draws a fault tree for early engagement of the hydraulic clutch based on the fault type; SS2: Conduct a simulation test on the premature engagement fault of the hydraulic clutch according to the fault tree. Check the fault points of the fuel pump, hydraulic clutch, reducer and left and right housings of the hydraulic clutch one by one and record the fault points. If the fault point is still not found after checking all structures, check all structures again until the fault point is found.

2. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In SS2, troubleshooting the fuel pump includes checking whether the fuel pump is supplying fuel prematurely; if so, record the fault point X1; otherwise, troubleshoot other structural fault points.

3. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In SS2, troubleshooting the hydraulic clutch includes: S201, Disassemble the internal structure of the hydraulic clutch and check for any abnormalities such as poor hydraulic clutch oil leakage or short test intervals. Verify whether the abnormalities lead to excessive oil accumulation. If it is related to poor hydraulic clutch oil leakage, proceed to S202; otherwise, proceed to S203. S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, check whether the oil leakage is related to the size of the housing oil leakage hole or the clutch test flow. If so, record the fault point and verify whether it causes the oil leakage. Otherwise, proceed to S203. S203, conduct a simulated test of the hydraulic clutch test interval time, check for any abnormalities and verify whether the length of the interval is related to poor oil leakage. If so, record the fault point X7; otherwise, investigate the fault points of other structures.

4. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 3, characterized in that, In S202, check whether the hydraulic clutch oil leakage is related to the elastic plate valve. If so, record the fault point, including: Check if the elastic sheet has too low a hardness. If so, record the fault point X2. Check if the spring plate radius is too large. If so, record the fault point X3. Check if the spring elasticity is too low. If so, record the fault point X4.

5. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 3, characterized in that, In S202, check whether the poor oil leakage is related to the size of the oil leakage hole in the housing or the clutch test flow rate. If so, record the fault point and verify whether it causes the poor oil leakage, including: Check if the poor oil leakage is related to the small size of the oil leakage hole in the housing. If so, record the fault point X5. Check if the poor oil flow is related to the low test flow of the clutch. If so, record the fault point X6.

6. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In SS2, troubleshooting the reducer includes: S301, check whether the reducer lubricating oil is leaking into the clutch: check whether it is related to poor ball surface sealing. If so, proceed to S302; otherwise, proceed to S303. S302, check if the reducer lubricating oil is related to the sealing of the spherical parts. If so, record the fault point; otherwise, proceed to S303. S303, check if the reducer lubricating oil is related to the clearance between the hydraulic clutch drain pipe and the gear shaft. If so, record the fault point X14; otherwise, troubleshoot other structural fault points.

7. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 6, characterized in that, In S302, the check of whether the reducer lubricating oil is related to the sealing performance of the spherical parts includes: Check if the spherical surface fit is poor; if so, record the fault point X8. Check if the spherical contact width is too small. If so, record the fault point X9. Check for poor spherical contact; if so, conduct a detailed inspection.

8. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 7, characterized in that, Check for poor spherical contact, including: Check if the axial dimension of the spherical part is deviated. If so, record the fault point X10. Check if the spring mounting bracket is not properly supported. If so, record the fault point X11. Check if the elastic dimension performance deviates. If so, record the fault point X12. Check if the static balance is poor and the vibration is large. If so, record the fault point X13. Otherwise, check the fault points of other structures.

9. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, In SS2, troubleshooting is performed on the left and right housings of the hydraulic clutch, including: S401, check if there is any jamming in the left and right housings of the hydraulic clutch. If so, proceed to S402; otherwise, after eliminating the cause of this fault, proceed to SS3. S402, check if the hydraulic clutch housing fit dimensions are off. If so, record the fault point X15; otherwise, proceed to 403. S403, check if any foreign objects have entered the hydraulic clutch mating surface. If so, record the fault point X16; otherwise, proceed to SS3.

10. The method for locating faults caused by premature engagement of a hydraulic clutch according to claim 1, characterized in that, It also includes SS3, which takes corresponding measures to eliminate faults based on the recorded fault points.

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