CN110006658A - The monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation influences - Google Patents
The monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation influences Download PDFInfo
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- CN110006658A CN110006658A CN201910284798.XA CN201910284798A CN110006658A CN 110006658 A CN110006658 A CN 110006658A CN 201910284798 A CN201910284798 A CN 201910284798A CN 110006658 A CN110006658 A CN 110006658A
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- frictional force
- torsional oscillation
- intrinsic frequency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/12—Testing internal-combustion engines by monitoring vibrations
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Abstract
The present invention is to provide the monitoring methods that a kind of shuttling device cylinder sleeve frictional force shaft torsional oscillation influences.One: calculating the intrinsic frequency of torsional vibration of shafting；Two: the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument；Three: the intrinsic frequency of the test of the intrinsic frequency of the calculating of step 1 and step 2 being compared, if not changing, is calculated frictional force as the exciting force of shafting vibration；If changing, the damping term that frictional force is converted to system is calculated；Four: the calculated result of step 3 being compared with the shafting torsional oscillation result under frictional force effect is not considered, analyzes the influence of frictional force shaft torsional oscillation amplitude, frequency.The present invention comprehensively considers the excitation effect of frictional force shaft torsional oscillation and the influence of shaft inherent characteristic, more comprehensive, scientifical research method is proposed, provides certain support to the on-line monitoring of shuttling device scuffing of cylinder bore failure using torsional vibration signals realization further to explore.
Description
Technical field
The present invention relates to a kind of shuttling device twisting vibration mechanism study methods, and especially one kind is in different lubricious strips
The research method that shuttling device frictional force shaft torsional oscillation influences under part.
Background technique
Piston ring-cylinder liner is one of most important friction pair of internal combustion engine, the operation troubles of internal combustion engine have quite a few with
Piston Ring Fault is related, piston ring-cylinder liner system it is most important effect be guarantee piston ring during exercise can with inboard wall of cylinder liner it
Between can form effective sealing, should prevent combustion chamber gases from scurrying into and cause gas leakage in crankcase, avoid crankcase again
In lubricating oil enter combustion chambers burn.For uncooled piston, accounts for about piston through piston ring heat dissipation and all absorb heat
50%~70%, therefore the operating condition very severe of piston ring, often it is in the working environment of high temperature, high pressure.Therefore, piston
Influence of ring-cylinder sleeve lubricating status to internal combustion engine becomes the one of current internal combustion engine tribology just by increasing attention
A important research direction.
Torsional oscillation is the calculating about transmission system driving frequency to intrinsic frequency influence degree, and the system of reflecting whether there is
The degree of danger of resonance (resonance), it is mainly related with the rotary inertia of each component parts of system and torsion stiffness.Torsional oscillation has very big
Destructiveness, the torsional stress that less serious case makes to act on axis changes, increases the fatigue damage of axis, reduce the service life, seriously
Torsional oscillation will lead to shaft system of unit damage or fracture, influence unit safety reliability service.
However, in many past research, due to theoretic limitation and computing capability are limited etc., people are often
The two is isolated into up research.Internal force of the frictional force as piston-cylinder liner system, when carrying out the conversion of shafting torsional oscillation equivalent,
It may act as the exciting force of torsional vibration of shafting, while can also be used as the damping term of shafting equivalent conversion, processing method
Selection depend on frictional force shaft torsional oscillation influence degree.
Currently, also extremely limited about open source literature of the frictional force to torsional oscillation influence degree verification method.2007, Australia was big
Guzzomi of Leah University of West Australia et al. has studied reciprocating machine with Variable inertia model and considers that torsional oscillation freely shakes when friction effects
The variation of dynamic frequency, but forced vibration is studied not yet.2014, Harbin Engineering University Lee played deep and remote et al. for the first time by piston
The forced response that ring group frictional force is introduced into twisting vibration finds 2 humorous secondary amplitudes of torsional angle to four-cycle diesel peculiar to vessel in calculating
Machine scuffing of cylinder bore failure is more sensitive, but influence of the document there is no consideration frictional force to system inherent characteristic, only by frictional force
A part as exciting force is calculated.
Summary of the invention
The purpose of the present invention is to provide one kind to be realized using torsional vibration signals to shuttling device scuffing of cylinder bore failure to explore
On-line monitoring provide support shuttling device cylinder sleeve frictional force shaft torsional oscillation influence monitoring method.
The object of the present invention is achieved like this:
Step 1: the intrinsic frequency of torsional vibration of shafting is calculated；
Step 2: the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument；
Step 3: the intrinsic frequency of the test of the intrinsic frequency of the calculating of step 1 and step 2 is compared, if not having
It changes, is then calculated frictional force as the exciting force of shafting vibration；If changing, frictional force is converted to the resistance of system
Buddhist nun calculates；
Step 4: the calculated result of step 3 is compared with the shafting torsional oscillation result under frictional force effect is not considered,
Analyze the influence of frictional force shaft torsional oscillation amplitude, frequency.
The present invention may also include:
1. the intrinsic frequency for calculating torsional vibration of shafting is by transfer matrix method computing system torsional vibration of shafting
Frequency and formation.
2. described test the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used by LMS Acquisition Instrument method particularly includes:
By controlling lubricating oil supply, the lubricating status of piston ring-cylinder liner is gradually changed, from rich oil lubrication to oil-poor profit
It is sliding, then after each stable conditions, acquired by LMS to dry friction so that the frictional force between piston ring-cylinder liner constantly increases
Instrument is tested to obtain the intrinsic frequency of shafting torsional oscillation using magnetoelectric transducer using the method for lifting revolving speed.
3. the relative variation of the intrinsic frequency of the test of the intrinsic frequency and step 2 of the calculating of step 1 is less than 10%,
Then it is considered as and does not change.
Described in 4. using frictional force as shafting vibration exciting force calculate in, forced vibration equation isWherein, [J] is the moment of inertia matrix of system, [C]
It is the damping matrix of system, [K] is the stiffness matrix of system,It is the amplitude of twisting vibration, { TpIt (t) } is that cylinder pressure produces
Raw excitation moment, { Ti(t) } be reciprocal inertia force generate excitation moment, { TfIt (t) } is that frictional force produces between piston ring-cylinder liner
Raw excitation moment.
During 5. the damping term that frictional force is converted to system described in is analyzed, forced vibration equation isWherein, [CfIt (t)] is converted by frictional force
Damping term.
The invention proposes the research methods that a kind of shuttling device cylinder sleeve frictional force shaft torsional oscillation influences, and comprehensively consider
The excitation effect of frictional force shaft torsional oscillation and the influence of shaft inherent characteristic are realized further to explore using torsional vibration signals
Certain support is provided to the on-line monitoring of shuttling device scuffing of cylinder bore failure.Main feature of the invention includes:
(1) in step 2, consider the variation of the torsional vibration of shafting intrinsic frequency under Different Lubrication Conditions Used.
(2) in step 3, comprehensively consider the excitation effect of frictional force shaft torsional oscillation and the shadow of shaft inherent characteristic
It rings.
(3) in step 3, if the damping term that frictional force is converted to system is analyzed, when which will become
The Analysis of Torsional Vibration of variable damping.
Compared with existing research method, of the invention is had the prominent advantages that:
Comprehensively consider the excitation effect of frictional force shaft torsional oscillation and the influence of shaft inherent characteristic, proposes more complete
Face, scientific research method mention the on-line monitoring of shuttling device scuffing of cylinder bore failure using torsional vibration signals realization further to explore
For certain support.
Detailed description of the invention
Fig. 1 is the monitoring method flow chart that shuttling device cylinder sleeve frictional force shaft torsional oscillation influences.
Specific embodiment
It illustrates below and the present invention is described in more detail.
Step 1: the intrinsic frequency of torsional vibration of shafting is calculated.
Pass through transfer matrix method, the frequency and formation of computing system torsional vibration of shafting.
Step 2: the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument；
By controlling lubricating oil supply, piston ring _ cylinder sleeve lubricating status is gradually changed, from rich oil lubrication to oil-poor profit
It is sliding, then after each stable conditions, acquired by LMS to dry friction so that the frictional force between piston ring _ cylinder sleeve constantly increases
Instrument is tested to obtain the intrinsic frequency of shafting torsional oscillation using magnetoelectric transducer using the method for lifting revolving speed.
Step 3: calculated result and test result are compared, and see whether intrinsic frequency changes.If the phase of the two
To variable quantity less than 10%, is then calculated frictional force as the exciting force of shafting vibration, frictional force is otherwise converted into system
Damping term is analyzed；
It is original strong if being calculated 1. intrinsic frequency has almost no change using frictional force as the exciting force of shafting vibration
Compel vibration equationIt will becomeWherein, [J] is the moment of inertia matrix of system, [C]
It is the damping matrix of system, [K] is the stiffness matrix of system,It is the amplitude of twisting vibration, { TpIt (t) } is that cylinder pressure produces
Raw excitation moment, { Ti(t) } be reciprocal inertia force generate excitation moment, { TfIt (t) } is that frictional force produces between piston ring _ cylinder sleeve
Raw excitation moment.
It is original if analyzing the damping term that frictional force is converted to system 2. significant change occurs for intrinsic frequency
Forced vibration equationIt will becomeWherein, [CfIt (t)] is converted by frictional force
Damping term.
Step 4: the calculated result of step 3 is compared with the shafting torsional oscillation result under frictional force effect is not considered,
Analyze the influence of frictional force shaft torsional oscillation amplitude, frequency etc..
Claims (9)
1. the monitoring method that a kind of shuttling device cylinder sleeve frictional force shaft torsional oscillation influences, it is characterized in that:
Step 1: the intrinsic frequency of torsional vibration of shafting is calculated；
Step 2: the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument；
Step 3: the intrinsic frequency of the test of the intrinsic frequency of the calculating of step 1 and step 2 is compared, if not becoming
Change, is then calculated frictional force as the exciting force of shafting vibration；If changing, frictional force is converted to the damping term of system
It is calculated；
Step 4: the calculated result of step 3 is compared with the shafting torsional oscillation result under frictional force effect is not considered, is analyzed
The influence of frictional force shaft torsional oscillation amplitude, frequency.
2. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 1 influences, it is characterized in that:
Less than 10%, then be considered as does not have the relative variation of the intrinsic frequency of the test of the intrinsic frequency and step 2 of the calculating of step 1
Variation.
3. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 1 or 2 influences, feature
Be: described using frictional force as in the calculating of the exciting force of shafting vibration, forced vibration equation isWherein, [J] is the moment of inertia matrix of system, [C]
It is the damping matrix of system, [K] is the stiffness matrix of system,It is the amplitude of twisting vibration, { TpIt (t) } is that cylinder pressure produces
Raw excitation moment, { Ti(t) } be reciprocal inertia force generate excitation moment, { TfIt (t) } is that frictional force produces between piston ring-cylinder liner
Raw excitation moment.
4. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 1 or 2 influences, feature
Be: during the damping term that frictional force is converted to system is analyzed, forced vibration equation isWherein, [J] is the moment of inertia matrix of system,
[C] is the damping matrix of system, and [K] is the stiffness matrix of system,It is the amplitude of twisting vibration, { TpIt (t) } is cylinder pressure
The excitation moment of generation, { Ti(t) } be reciprocal inertia force generate excitation moment, [CfIt (t)] is the damping being converted by frictional force
?.
5. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 3 influences, it is characterized in that:
During the damping term that frictional force is converted to system is analyzed, forced vibration equation isWherein, [CfIt (t)] is the resistance being converted by frictional force
Buddhist nun.
6. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 1 or 2 influences, feature
It is the intrinsic frequency that shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument method particularly includes: pass through control
Lubricating oil supply gradually changes the lubricating status of piston ring-cylinder liner, lubricates from rich oil to Starved Lubrication, then arrives dry friction, so that
Frictional force between piston ring-cylinder liner constantly increases, after each stable conditions, by LMS Acquisition Instrument, and using magnetoelectric transducer,
It tests to obtain the intrinsic frequency of shafting torsional oscillation using the method for lifting revolving speed.
7. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 3 influences, it is characterized in that
It is described that the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument method particularly includes: to be slided by control
Oily supply gradually changes the lubricating status of piston ring-cylinder liner, lubricates from rich oil to Starved Lubrication, then arrives dry friction, so that living
Frictional force between plug ring-cylinder sleeve constantly increases, and after each stable conditions, is adopted by LMS Acquisition Instrument using magnetoelectric transducer
It tests to obtain the intrinsic frequency of shafting torsional oscillation with the method for lifting revolving speed.
8. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 4 influences, it is characterized in that
It is described that the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument method particularly includes: to be slided by control
Oily supply gradually changes the lubricating status of piston ring-cylinder liner, lubricates from rich oil to Starved Lubrication, then arrives dry friction, so that living
Frictional force between plug ring-cylinder sleeve constantly increases, and after each stable conditions, is adopted by LMS Acquisition Instrument using magnetoelectric transducer
It tests to obtain the intrinsic frequency of shafting torsional oscillation with the method for lifting revolving speed.
9. the monitoring method that shuttling device cylinder sleeve frictional force shaft torsional oscillation according to claim 5 influences, it is characterized in that
It is described that the intrinsic frequency of shafting torsional oscillation under Different Lubrication Conditions Used is tested by LMS Acquisition Instrument method particularly includes: to be slided by control
Oily supply gradually changes the lubricating status of piston ring-cylinder liner, lubricates from rich oil to Starved Lubrication, then arrives dry friction, so that living
Frictional force between plug ring-cylinder sleeve constantly increases, and after each stable conditions, is adopted by LMS Acquisition Instrument using magnetoelectric transducer
It tests to obtain the intrinsic frequency of shafting torsional oscillation with the method for lifting revolving speed.
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Cited By (3)
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| CN113657328A (en) * | 2021-08-24 | 2021-11-16 | 重庆大学 | Self-powered bearing with torsional vibration fault diagnosis function and torsional vibration fault diagnosis method |
| CN114112769A (en) * | 2021-11-24 | 2022-03-01 | 中国水利水电科学研究院 | Triaxial tester pressure chamber piston friction force calibration method and device |
| CN114357840A (en) * | 2022-01-10 | 2022-04-15 | 西南石油大学 | Reciprocating compressor crankshaft system torsional vibration calculation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113657328A (en) * | 2021-08-24 | 2021-11-16 | 重庆大学 | Self-powered bearing with torsional vibration fault diagnosis function and torsional vibration fault diagnosis method |
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| CN114357840B (en) * | 2022-01-10 | 2024-03-29 | 西南石油大学 | Torsional vibration calculation method for crankshaft system of reciprocating compressor |
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