CN111504238B - Micro-amplitude displacement testing method and device for vibration isolation device in diesel engine running state - Google Patents
Micro-amplitude displacement testing method and device for vibration isolation device in diesel engine running state Download PDFInfo
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- CN111504238B CN111504238B CN202010355694.6A CN202010355694A CN111504238B CN 111504238 B CN111504238 B CN 111504238B CN 202010355694 A CN202010355694 A CN 202010355694A CN 111504238 B CN111504238 B CN 111504238B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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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
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Abstract
In order to solve the problem of low measurement precision of the displacement of the vibration isolator caused by measurement of a graduated scale in the prior art, the invention provides a method and a device for testing the micro-amplitude displacement of a vibration isolator in a diesel engine running state, which are characterized in that: vertical displacement data and diesel engine axial position change data at the four vibration isolators are respectively collected through sensors, and then the data are divided into two groups according to the relative positions of the free end and the flywheel end of the diesel engine; comparing the two groups of data, and judging the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine; and finally, judging whether the diesel engine is inclined or not when the vertical displacement changes by combining the data of the axial position change of the diesel engine. The device provided by the invention has the advantages of simple structure and accurate measurement, and compared with the prior art, the precision and the real-time performance are greatly improved.
Description
Technical Field
The invention belongs to the technical field of diesel engine testing, and particularly relates to a micro-amplitude displacement testing method and device for a vibration isolation device in a diesel engine running state.
Background
The diesel engine vibration isolation system is a system for installing the diesel engine on a proper elastic device to isolate mechanical vibration transmission, various unbalanced forces and moments can be generated due to the working characteristics of reciprocating machinery when the diesel engine is in an operating state, the unbalanced forces can be directly applied to the vibration isolation device of the diesel engine, and the vibration transmission between the diesel engine and a base is adjusted through the micro-amplitude change of the vibration isolator. The vibration characteristic of the diesel engine and the installation characteristic of the diesel engine can be judged through displacement testing, and data support is provided for the vibration characteristic optimization of the diesel engine and the optimization of the vibration isolation device.
At present, a common graduated scale is usually used for measuring the displacement of the vibration isolator in a static state in a vertical displacement test of the diesel engine vibration isolator, and a common test method is to compare test data before starting and after starting.
Disclosure of Invention
The invention provides a micro-amplitude displacement testing method and device for a vibration isolation device in a diesel engine running state, aiming at solving the problem of low measurement precision of the displacement of the vibration isolation device caused by measurement of a graduated scale in the prior art.
In order to achieve the purpose, the invention adopts the specific scheme that: a micro-amplitude displacement testing method for a vibration isolation device in a diesel engine running state is characterized by comprising the following steps: the method comprises the steps that vertical displacement data of vibration isolators of four machine legs and axial position change data of a diesel engine are collected through sensors respectively, and then the data are divided into two groups according to the relative position of the diesel engine; comparing the two groups of data, and judging the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine; and finally, judging whether the diesel engine is inclined or not when the vertical displacement changes by combining the data of the axial position change of the diesel engine.
A micro-amplitude displacement testing device of a vibration isolation device in a diesel engine running state is characterized by comprising a first sensor, a second sensor, a third sensor, a fourth sensor, a fifth sensor, a data acquisition instrument and an upper computer; the first sensor, the second sensor, the third sensor and the fourth sensor are respectively arranged beside the four vibration isolators of the diesel engine; the data acquisition instrument acquires data of the first sensor, the second sensor, the third sensor, the fourth sensor and the fifth sensor and sends the data to the upper computer.
The micro-amplitude displacement testing device for the vibration isolation device in the running state of the diesel engine further comprises a base for mounting the diesel engine; the diesel engine is elastically installed on the base through the vibration isolator.
Has the advantages that: according to the invention, displacement data is obtained by carrying out displacement tracking measurement on four vibration isolators, the data is grouped and compared according to the positions of the vibration isolators, the consistency and difference of the vibration rules of the front end and the rear end of the diesel engine are obtained, and finally, whether the diesel engine is inclined or not is detected by combining the axial displacement data in the operation process of the diesel engine. The device provided by the invention has the advantages of simple structure and accurate measurement, and compared with the prior art, the precision and the real-time performance are greatly improved.
Drawings
Fig. 1 is a schematic diagram of the mechanism of the present invention.
FIG. 2 is a graph comparing the change of displacement curves in the embodiment I.
FIG. 3 is a comparison graph of the displacement variation law in the power-on state and the power-off state in the embodiment II.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In order to solve the problems of inaccuracy and incapability of recording in real time of the traditional measuring method, the invention provides a testing method for recording the real-time changes of the vertical displacement and the axial displacement of a vibration isolator in the actual running state of a diesel engine and judging the running stability of the diesel engine.
Referring to fig. 1, a micro-amplitude displacement testing device for a vibration isolation device in a diesel engine running state, a base 9 of a diesel engine 8 is installed, and the diesel engine 8 is elastically installed on the base 9 through a vibration isolator; respectively arranging a first sensor 1, a second sensor 2, a third sensor 3 and a fourth sensor 4 near four vibration isolators of a diesel engine foot; the fifth sensor 5 is arranged at the axial end face of the diesel engine; and then the data of the first sensor 1, the second sensor 2, the third sensor 3, the fourth sensor 4 and the fifth sensor 5 are collected by the data collector 6 and are all sent to the upper computer 7.
Specific example I: the first sensor 1 and the second sensor 2 are divided into a group, the third sensor 3 and the fourth sensor 4 are divided into a group, and the consistency and the difference of the vibration rules of the front end and the rear end of the diesel engine are analyzed after grouping. Because the counterweights at the front end and the rear end of the diesel engine are different, the overturning moment transmission of the diesel engine is different in the running state, so that the situation that the front displacement change and the rear displacement change are possibly inconsistent can be caused, whether the front displacement and the rear displacement of the diesel engine incline or not is judged by combining the change curve of the axial displacement of the fifth sensor 5, and fig. 2 is a comparison graph of the change rules of two groups of displacement curves under a certain working condition. Analyzing two sets of displacement curves at the front end and the rear end, observing the change rates of the two sets of curves, if the change of the displacement curves of the first sensor 1 and the second sensor 2 is obviously larger than that of the displacement curves measured by the third sensor 3 and the fourth sensor 4, the problem of integral inclination of the diesel engine can be solved, and the inclination of the diesel engine in the operation process can be judged through the auxiliary curve of the fifth sensor 5; if the displacement curves of the first sensor 1 and the second sensor 2 and the displacement curves measured by the third sensor 3 and the fourth sensor 4 are changed greatly, the auxiliary curve of the fifth sensor 5 can be used for judging that the diesel engine is probably changed integrally in the running process, but does not incline.
Specific example II: the displacement of the diesel engine can be greatly changed in a starting state and a stopping state. And comparing displacement change curves of the first sensor 1 before and after starting. Fig. 3 is a comparison graph of displacement change rules of the first sensor 1 in the power-on state and the power-off state. The shutdown is a static process, the startup operation is a dynamic process, the high-sensitivity displacement sensor can identify static micro-amplitude displacement, a dynamic displacement curve in an operation state is compared with a static displacement curve, if the amplitude of the dynamic displacement curve is increased, but the absolute displacement of a balance position is not changed, the situation that the amplitude is larger but the inclination is not generated when the diesel engine operates is shown; if the amplitude of the dynamic displacement curve is increased, the absolute displacement of the balance position is also changed greatly, which indicates that the amplitude is large when the diesel engine runs, and the diesel engine inclines towards a certain direction in the running process.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily change or replace the present invention within the technical scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.
Claims (1)
1. A micro-amplitude displacement testing method for a vibration isolation device in a diesel engine running state is characterized by comprising the following steps:
the method comprises the steps that vertical displacement data of four vibration isolators and data of position change of the axial end face of a diesel engine are collected through sensors respectively, and then the vertical displacement data are divided into two groups according to the relative positions of the free end and the flywheel end of the diesel engine;
comparing the vertical displacement data of the two vibration isolators close to the free end of the diesel engine with the vertical displacement data of the two vibration isolators close to the flywheel end of the diesel engine, and judging the consistency and difference of the vibration rules of the free end and the flywheel end of the diesel engine;
finally, judging whether the diesel engine is inclined or not when the vertical displacement is changed by combining the data of the position change of the axial end face of the diesel engine;
the process of comparing the two groups of data is as follows: simultaneously recording data tested by a first sensor (1), a second sensor (2), a third sensor (3) and a fourth sensor (4) in a graph, and comparing the change rules of the two groups of sensors;
the analysis process of the two groups of data combined with the data of the position change of the axial end face of the diesel engine comprises the following steps: the data of the axial end face position change is used as an auxiliary analysis parameter, two groups of vertical displacement data are compared, the data of the axial end face position change is used as a reference, and whether the diesel engine overturns forwards and backwards or not can be analyzed.
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