CN109580020B - Visual online test system for temperature field of parts of combustion chamber of marine low-speed machine - Google Patents
Visual online test system for temperature field of parts of combustion chamber of marine low-speed machine Download PDFInfo
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- CN109580020B CN109580020B CN201811418909.3A CN201811418909A CN109580020B CN 109580020 B CN109580020 B CN 109580020B CN 201811418909 A CN201811418909 A CN 201811418909A CN 109580020 B CN109580020 B CN 109580020B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/023—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples provided with specially adapted connectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2205/00—Application of thermometers in motors, e.g. of a vehicle
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Abstract
The invention relates to a visual online test system for a temperature field of parts of a combustion chamber of a marine low-speed machine, which comprises a temperature field sensing test piece of the parts of the combustion chamber, a signal integrated acquisition device and a visual online test module, wherein the sensing test piece comprises a piston, a cylinder cover, a cylinder sleeve and an exhaust valve temperature field sensing test piece, the signal integrated acquisition device comprises an integrated acquisition device for wireless and wired signals of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve, and the visual online test module establishes a visual three-dimensional model for the parts and utilizes a spatial interpolation algorithm to realize the online display of the parts of the combustion chamber in different modes.
Description
Technical Field
The invention relates to the technical field of testing of marine low-speed machines, in particular to a visualized online testing system for temperature fields of combustion chamber parts of marine low-speed machines.
Background
The test of the temperature field of the combustion chamber parts of the marine low-speed engine is which is an important technical link of development, type approval test and upgrading and reconstruction of the low-speed engine, and the test and analysis of the temperature field of the combustion chamber parts can evaluate the heat load distribution and the working reliability of the combustion chamber parts.
The temperature test of parts of the marine low-speed engine combustion chamber mainly comprises a hardness plug method, a fusible alloy method, a linkage transmission mechanism method, a wireless remote measurement method and the like, the temperature test of the parts in the operation process can be completed by the method, but the functions of cloud pictures of three-dimensional space temperature fields of the parts of the combustion chamber in the aspect of online display, temperature gradient and the like are insufficient, special parts with the temperature field sensing test of the parts of the marine low-speed engine combustion chamber are not developed in a test system formed by the method, the integrity and the relevance of the temperature field distribution in the operation of the marine low-speed engine piston, the cylinder sleeve, the cylinder cover and the exhaust valve are not sufficient, and the analysis efficiency of temperature field test data is low.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, visual online test systems for the temperature field of the combustion chamber parts of the marine low-speed engine are provided, sets of test pieces for the temperature field of the combustion chamber parts are provided, and the online display of the temperature field of the combustion chamber parts in different modes is realized by establishing a visual three-dimensional model for the parts.
The technical scheme adopted by the invention for solving the technical problems is as follows:
visual online test system of marine low-speed machine combustion chamber spare part temperature field includes:
the temperature field perception test piece comprises a piston perception test piece, a cylinder cover perception test piece, a cylinder sleeve perception test piece and an exhaust valve perception test piece, wherein a thermocouple sensor for perceiving temperature is embedded in each perception test piece, the encapsulation is firm, the requirement of the working condition of a combustion chamber is met, and an external temperature signal transmission interface is arranged;
the signal integrated acquisition device comprises a piston wireless acquisition device and a cylinder cover, a cylinder sleeve and an exhaust valve wired acquisition device, and realizes the integrated acquisition of wireless and wired signals;
the visual online test module is used for dividing grids of all parts by establishing a three-dimensional model of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve, and mapping the acquired and communicated temperature signals into the three-dimensional model through a spatial interpolation algorithm by utilizing a grid mapping principle to realize visual display of the whole temperature field distribution of the three-dimensional model of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve.
In the scheme, the measuring points of the piston perception test piece are arranged at the upper part and the lower part of the piston top and the th piston ring groove, a through hole is drilled at each measuring point, the diameter of the through hole is determined according to the size of the piston and is more than 2 times of the diameter of the thermocouple sensor, two thermocouple sensors are arranged in each measuring point hole, and the distance difference is arranged in the aperture direction, so that the measurement of the temperature gradient is realized.
In the scheme, the measuring points of the cylinder cover sensing test piece are arranged in a layered mode in the vertical direction, a blind hole is drilled in each measuring point, the diameter of each blind hole is determined according to the size of the cylinder cover and is larger than 2 times of the diameter of the thermocouple sensor, two thermocouple sensors are installed in each measuring point hole, and the distance difference is arranged in the aperture direction, so that the temperature gradient is measured.
In the scheme, the measuring points of the cylinder sleeve perception test piece are arranged in a plurality of layers according to the axis direction of the cylinder sleeve, and the arrangement principle is as follows: the number of layers from the combustion chamber to the scavenging port part of the cylinder sleeve is from dense to sparse, the total number of layers is less than or equal to 10, a blind hole is drilled at each measuring point, the diameter of the blind hole is determined according to the size of the cylinder sleeve and is more than 2 times of the diameter of the thermocouple sensor, two thermocouple sensors are installed in each measuring point hole, and the distance difference is set in the aperture direction, so that the measurement of the temperature gradient is realized.
In the scheme, the measuring points of the exhaust valve sensing test piece are arranged above and below the valve disc, the exhaust valve rod drills a straight blind hole from the center of the valve disc, an inclined blind hole is drilled at the upper part of the exhaust valve rod, and the two blind holes are intersected at the upper part of the exhaust valve rod and used for leading a thermocouple sensor.
In the above scheme, exhaust valve perception test piece upper portion has milled the axial groove, and axial groove length is greater than the pneumatic valve lift, arranges on the exhaust valve casing to bore locating hole and pin hole, and the locating hole is used for the fixed position round pin, and the locating pin can insert the axial groove for restraint exhaust valve circumferential direction, and the pin hole is used for the lead wire of exhaust valve thermocouple sensor.
In the above scheme, the piston wireless acquisition device comprises an acquisition and signal transmitter, a signal receiver and a signal conditioner; the acquisition and signal transmitter is arranged at the lower part of a low-speed machine piston group, the signal receiver is fixed at the bottom of a low-speed machine cylinder sleeve, and an external temperature signal interface on the piston perception test piece is connected with the acquisition and signal transmitter; the signal conditioning machine is arranged outside the low-speed machine for the ship and connected with the signal receiver through a signal wire, and the signal conditioning machine is connected with a PC (personal computer) with a test system.
In the scheme, the wired acquisition device for the cylinder cover, the cylinder sleeve and the exhaust valve is arranged outside the marine low-speed machine and is respectively connected with external temperature signal interfaces on a cylinder cover perception test piece, a cylinder sleeve perception test piece and an exhaust valve perception test piece through signal wires; the wired acquisition device comprises a power module, an acquisition card and an Ethernet communication module, wherein the power module supplies power to the acquisition card, and the Ethernet communication module is connected with a PC (personal computer) with a test system and used for signal transmission.
In the above scheme, the visual online test module specifically includes the following steps:
(1) drawing a three-dimensional model of the sensing test piece of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve, drawing a grid, obtaining grid node coordinates, and determining the position relation between a thermocouple sensor measuring point and a model node;
(2) setting weight coefficient omega of spatial interpolation algorithm according to position relationiJudging whether the measuring point of the thermocouple sensor coincides with the grid node, calculating the weight coefficient of each thermocouple sensor point to the grid node, and calculating the interpolation result of each grid node according to a distance reciprocal interpolation algorithm;
(3) and giving corresponding rendering color values to the grid nodes through the scale attributes of the color bars, so as to obtain a real-time three-dimensional temperature field representation image of the whole model, and be used for carrying out real-time online display on different test piece models.
In the above scheme, the visual online test module further comprises a parameter setting module, a multi-mode display module, and a data storage and playback module; the parameter setting module is used for setting parameters of the thermocouple sensors of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve, and parameters of the acquisition channel and the acquisition device; the multi-mode display module is used for displaying the visual online temperature field of the parts of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve; and the data storage and playback module is used for realizing the functions of storing and playing back according to the set temperature signal channel.
The invention has the beneficial effects that:
(1) through the design and development of the visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed engine, the distribution rule of the temperature field of the parts of the combustion chamber of the low-speed engine can be mastered, the heat load and the working reliability of the parts of the combustion chamber can be analyzed and evaluated, and the test foundation is laid for the development of important technical links such as the development and development of the low-speed engine, the type approval test, the upgrading and the transformation and the like.
(2) The development method of the low-speed machine sensing test piece is provided by designing measures such as arrangement of temperature field test points of combustion chamber parts such as a piston, a cylinder cover, a cylinder sleeve, an exhaust valve and the like, wiring, packaging of a sensor and the like, only universal piston, cylinder cover, cylinder sleeve and exhaust valve sensing test pieces are required to be developed aiming at a low-speed machine of a certain type, the work such as arrangement of the test points, wiring, packaging of the sensor and the like is completed on each test piece, when the temperature field test is required to be carried out on the series of low-speed machines, the temperature field test can be carried out quickly only by replacing the corresponding parts of the low-speed machine with the developed universal piston, cylinder cover, cylinder sleeve and exhaust valve sensing test pieces, and time and labor.
(3) The visual design of the temperature field test adopts a three-dimensional visual cloud picture model display method, develops a visual and novel combustion chamber part temperature field test system, increases the integrity and the relevance of the low-speed engine combustion chamber part display, and improves the efficiency of temperature field test data analysis.
(4) Two thermocouple sensors with different depths are arranged in each measuring point hole of the piston, the cylinder cover and the cylinder sleeve sensing test piece, and the distance difference is arranged in the direction of the hole diameter, so that the measurement of the temperature gradient is realized.
Drawings
The invention will be further described with reference to the drawings and examples, in which:
FIG. 1 is a schematic diagram of the overall structure of the test system of the present invention;
FIG. 2 is a schematic view of a temperature field sensing test piece and thermocouple sensor arrangement of the test system of FIG. 1;
FIG. 3 is a through hole package layout of a piston trial thermocouple sensor;
FIG. 4 is a design drawing of blind hole package for a thermocouple sensor for a cylinder head, cylinder liner and exhaust valve test piece;
FIG. 5 is a block diagram of a test system according to the present invention.
In the figure: 11. a piston sensing test piece; 12. a cylinder cover perception test piece; 13. a cylinder sleeve perception test piece; 14. the exhaust valve senses the test piece; 15. a thermocouple sensor; 16. an exhaust valve housing; 21. an acquisition and signal transmitter; 22. a signal receiver; 23. a signal conditioner; 24. a wired acquisition device; 25. a junction box; 30. a visual online test module; 41. a bushing; 42. a heat conducting plug; 43. armor wires; 44. and (4) plugging the head.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the visualized online testing system for the temperature field of the parts and components of the marine low-speed engine combustor, which is a preferred embodiment of the invention , comprises a temperature field perception test piece of the parts and components of the combustor, a signal integration and acquisition device and a visualized online testing module 30, wherein the temperature field perception test piece is used for solving the test point arrangement, packaging and wiring scheme of a thermocouple sensor 15 and providing a development scheme for the temperature field test piece of the parts and components of the combustor, the signal integration and acquisition device is used for integrating the acquisition of temperature signals of various moving parts and fixed parts of the combustor, and the visualized online testing module 30 is used for realizing the online display of the temperature field of the parts and components of the combustor in different modes by establishing a visualized three-dimensional model for the parts and components.
The temperature field perception test piece comprises a piston perception test piece 11, a cylinder cover perception test piece 12, a cylinder sleeve perception test piece 13 and an exhaust valve perception test piece 14, wherein a thermocouple sensor 15 for temperature perception is embedded in each perception test piece, the encapsulation is firm, the requirements of high-temperature and high-pressure resistance and other combustion chamber working conditions are met, and an external temperature signal transmission interface is arranged.
The signal integrated acquisition device comprises a piston wireless acquisition device, a cylinder cover, a cylinder sleeve and an exhaust valve wired acquisition device, and realizes the integrated acquisition of wireless and wired signals.
The visual online test module 30 is used for establishing a three-dimensional model of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve, dividing grids of all parts, and mapping the acquired and communicated temperature signals into the three-dimensional model through a spatial interpolation algorithm by using a grid mapping principle to visually display the whole temperature field distribution of the three-dimensional model of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve.
The invention provides a temperature field test scheme for four important heated parts, namely a moving part piston and an exhaust valve, a fixed part cylinder sleeve and a complex part cylinder cover in a combustion chamber of a marine low-speed machine, and realizes the function of visually displaying the temperature field distribution of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve of the marine low-speed machine in operation by integrating and collecting signals and developing visual online test software, thereby increasing the integrity and the relevance of the part display of the combustion chamber of the low-speed machine, improving the efficiency of temperature field test data analysis and providing an important test platform for the thermal load analysis of the combustion chamber parts in development, type approval test and upgrading and reconstruction of the marine low-speed machine.
, optimization is carried out, in the embodiment, the measuring points of the piston perception test piece 11 are arranged at the top and the lower part of the piston top and piston ring groove, because the distribution of fuel gas or waste gas to the heating part of the piston head part in the combustion process has symmetry, the number of the measuring points of the sensor can be reduced according to the number of the marine low-speed engine fuel injectors and the symmetry of the installation positions of the marine low-speed engine fuel injectors (if 2 fuel injectors are symmetrically arranged, the measuring points are only arranged in a 180-degree semicircle, and if 3 fuel injectors are symmetrically arranged, the measuring points are only arranged in a 120-degree fan-shaped circle), and the measuring points of the piston ring groove.
As shown in FIG. 3, the processing scheme of the measuring point hole of the piston perception test piece 11 is that a through hole is drilled at each measuring point, the diameter of the through hole is determined according to the size of a piston and is slightly larger than 2 times of the diameter of a selected armored thermocouple sensor 15, a heat conducting plug 42 is arranged in the through hole, 2 holes slightly larger than the armored thermocouple sensor 15 are processed in the heat conducting plug 42 and are used for fixedly placing 2 armored thermocouple sensors 15, a distance difference is arranged in the aperture direction to achieve measurement of temperature gradient, a lining 41 is arranged on the surface of the heat conducting plug 42 to prevent the heat conducting plug 42 from loosening, the head of the piston and the through hole in an -th gas ring groove are welded by using a same material choke plug 44 to prevent high-temperature high-pressure gas from affecting the processing through hole, the heat conducting plug 42 and the processed through hole are fixedly sealed by using high-temperature heat conducting glue to prevent cooling lubricating oil from permeating, an armored wire 43 of the thermocouple sensor 15 can be fixed by spot welding of 0.1mm, the steel sheet mounting wire 43 of the thermocouple sensor is introduced into a piston group portion, the lower portion of the piston group is processed by processing a hollow block, the outer diameter of the piston is slightly smaller than the outer diameter of the outer circle of the piston.
, in the embodiment, in the arrangement scheme of the measuring points of the cylinder cover perception test piece 12, due to the fact that gas or waste gas has symmetry on distribution of heating parts on the inner surface of the cylinder cover, the gas or waste gas can be arranged according to the piston perception test piece 11 similar to the arrangement scheme of the measuring points, the gas or waste gas can be arranged in two layers or three layers in the vertical direction (specifically, the embodiment is arranged in three layers), as shown in fig. 4, the processing scheme of the measuring points of the cylinder cover perception test piece 12 is that blind holes are drilled on each measuring point, the diameter of each blind hole is determined according to the size of a cylinder cover of a low-speed machine and is slightly larger than 2 times of the diameter of the selected armored thermocouple sensor 15, the blind holes are about 3mm away from the surface of the heating parts to ensure strength, heat conducting plugs 42 are arranged in the blind holes, 2 holes slightly larger than the armored thermocouple sensors 15 are processed on the heat conducting plugs 42 and are used for fixedly placing 2 armored thermocouple sensors 15, distance difference is arranged in the aperture direction to realize measurement of temperature gradient, bushings 41 are arranged on the surface of the heat conducting plugs 42 to prevent the looseness of the heat conducting plugs 42 and the processed blind holes from being fixedly sealed by high-temperature conducting glue, the high-temperature-conducting plugs 42, the processed blind holes are used for preventing the cooling water-leading-out of a plurality of thermocouple sensors 25 and the thermocouple sensors from the thermocouple-out of a cooling water-leading-out thermocouple-.
, in the embodiment, in the arrangement scheme of the measuring points of the cylinder sleeve perception test piece 13, due to the fact that gas or waste gas has symmetry on distribution of heating parts on the inner surface of the cylinder sleeve, the temperature is higher near the upper portion of the cylinder sleeve, the arrangement scheme can be similar to the arrangement scheme of the measuring points according to the piston perception test piece 11, the number of layers from a combustion chamber to a scavenging port of the cylinder sleeve is from dense to sparse, the total number of layers is less than or equal to 10 (specifically, 7 layers are arranged in the embodiment). As shown in FIG. 4, the processing scheme of the measuring point holes of the cylinder sleeve perception test piece 13 is that blind holes are drilled at each measuring point, the diameter of each blind hole is determined according to the size of the cylinder sleeve of a low-speed machine, the diameter of each blind hole is slightly larger than the diameter of the selected armored thermocouple sensor 15, the distance of each blind hole is about 3mm from the surface of the heated portion, the strength is ensured, a heat conducting plug 42 is arranged in each blind hole, 2 holes slightly larger than the armored thermocouple sensors 15 are processed on the heat conducting plug 42, the holes are used for fixedly arranged, the armored thermocouple sensors 15, the difference is arranged in the aperture direction, the steel sheets are arranged to realize measurement of the temperature gradient, the cylinder sleeve, the heat conducting plug 41 is used for preventing the heat conducting plug 42 from loosening, the heat conducting plug 42 from penetrating through the high-temperature of the cylinder sleeve, the high-temperature-sealing junction box, the thermocouple-sealing plug 43, the thermocouple-type thermocouple.
steps are optimized, in the embodiment, in the measuring point arrangement scheme of the exhaust valve perception test piece 14, gas or waste gas has symmetry on distribution of heating parts of an exhaust valve, the upper side and the lower side of a valve disc of the exhaust valve are heated, and therefore, armored thermocouple sensors 15 need to be arranged on the upper side and the lower side of the valve disc, a pit of about 3mm needs to be milled at each measuring point due to the fact that the valve disc of the exhaust valve is thin, a measuring head of the armored thermocouple sensor 15 is fixed through a spot welding machine, a straight blind hole is drilled in the center of the valve disc of the exhaust valve, an inclined blind hole is drilled in the upper portion of the valve disc of the exhaust valve, the two blind holes intersect at the upper portion of the valve rod of the exhaust valve and used for leading a thermocouple sensor 15, the diameter of the blind hole can meet the requirement for packaging of armored wires 43 of all the thermocouple sensors 15 at the measuring.
optimization is carried out, in the embodiment, an axial groove is milled on the upper portion of the exhaust valve perception test piece 14, the length of the axial groove is larger than the lift of the air valve, a positioning hole and a lead hole are arranged on the exhaust valve shell 16, the positioning hole is used for fixing a positioning pin, the positioning pin can be inserted into the axial groove and used for restraining circumferential rotation of the exhaust valve, the lead hole is used for leading the exhaust valve thermocouple sensor 15, a thermocouple extension line which is larger than about 4mm of the lift of the exhaust valve needs to be reserved more, the exhaust valve is prevented from being broken in operation, and the lead hole is.
, optimizing, in the embodiment, the piston wireless acquisition device comprises an acquisition and signal transmitter 21, a signal receiver 22 and a signal conditioner 23, wherein the acquisition and signal transmitter 21 is fixedly installed on a hollow circular plate at the lower part of a low-speed machine piston group, the signal receiver 22 is fixed at the bottom of a low-speed machine cylinder sleeve through a bolt, the acquisition and signal transmitter 21 and the signal receiver 22 are installed in a way that when the piston runs to a lower endpoint, the acquisition and signal transmitter 21 and the signal receiver 22 are opposite and a gap is ensured, the gap ensures transmission of signals and energy, an external temperature signal interface on the piston sensing test piece 11 is connected with the acquisition and signal transmitter 21, the signal conditioner 23 is installed outside the marine low-speed machine and is connected with the signal receiver 22 through a signal wire, the signal conditioner 23 is connected with a PC with a test system, and a lead hole is processed on a scavenging air box and used for a signal wire lead, and the.
, in this embodiment, the wired collection device 24 collects the temperatures of the cylinder cover, the cylinder sleeve and the exhaust valve in a centralized manner, and is connected to the external temperature signal interfaces of the cylinder cover sensing test piece 12, the cylinder sleeve sensing test piece 13 and the exhaust valve sensing test piece 14 through signal lines, the wired collection device 24 is installed outside the marine low-speed machine, and includes a power module, a collection card and an ethernet communication module, the power module supplies power to the collection card, and the ethernet communication module is connected to a PC with a test system for signal transmission.
, optimizing, in this embodiment, the visual online test module 30 is designed for the temperature field test of the low-speed machine parts, and it divides the part grids by establishing three-dimensional models of the piston, cylinder sleeve, cylinder cover and exhaust valve, and maps the collected and communicated temperature signals into the three-dimensional model by the spatial interpolation algorithm by using the grid mapping principle, so as to realize the visual display of the whole temperature field distribution of the three-dimensional models of the piston, cylinder sleeve, cylinder cover and exhaust valve, and the mapping principle is as follows:
the cloud picture display method is based on a distance reciprocal weighted interpolation algorithm, and the distance reciprocal interpolation algorithm has the basic idea that: given the coordinate values of the measured point and the unmeasured point, according to the distance between the measured point and the unmeasured point, the attribute value of the measured point is given corresponding weight, the attribute value of the measured point closer to the unmeasured point is given large weight, the attribute value of the measured point farther from the unmeasured point is given smaller weight, as shown in formula (1),
wherein: p (Z) represents the value of the attribute Z of the untested point P, N represents the number of tested points, ZiAttribute value representing the ith measured point, di(x, y) denotes the distance from the ith point to the P point, i.e.
, the value of u is 2, and the larger the value of u is, the more gradual the change of the obtained interpolation result is, or it can be expressed as:
wherein: p (Z), N, ZiIs as defined for formula (1), omegaiRepresents ZiOccupied weight, ωiSatisfies the following conditions:
according to the above principle, the cloud map mapping process of the temperature field of the visual online test module 30 is as follows: firstly, drawing a model grid of a piston, a cylinder cover, a cylinder sleeve and an exhaust valve perception test piece 14, obtaining grid node coordinates, determining the position relation between a measuring point of a thermocouple sensor 15 and a model node, and setting a weight coefficient omega of a spatial interpolation algorithm according to the position relationiJudging whether a measuring point of a thermocouple sensor 15 is coincided with the grid node, calculating a weight coefficient of each sensor point to the grid node, calculating an interpolation result of each grid node according to a distance reciprocal interpolation algorithm, setting scale attributes of color bars in software to endow corresponding rendering color values to the grid node, and obtaining a real-time three-dimensional temperature field representation image of the whole model for real-time online display of different test piece models.
The visual online test module 30 further comprises a parameter setting module, a multi-mode display module, and a data storage and playback module; the parameter setting module is used for setting parameters of the thermocouple sensor 15 of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve, and parameters of the acquisition channel and the acquisition device; the multi-mode display module is used for displaying visual online temperature fields of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve; and the data storage and playback module is used for realizing the storage and playback functions according to the set temperature signal channel.
The visual online test system for the temperature field of the parts of the marine low-speed engine combustion chamber has the beneficial effects that:
(1) through the design and development of the visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed engine, the distribution rule of the temperature field of the parts of the combustion chamber of the low-speed engine can be mastered, the heat load and the working reliability of the parts of the combustion chamber can be analyzed and evaluated, and the test foundation is laid for the development of important technical links such as the development and development of the low-speed engine, the type approval test, the upgrading and the transformation and the like.
(2) The development method of the low-speed machine sensing test piece is provided by designing measures such as temperature field test point arrangement, wiring and sensor packaging of combustion chamber parts such as a piston, a cylinder cover, a cylinder sleeve, an exhaust valve and the like, only universal piston, cylinder cover, cylinder sleeve and exhaust valve sensing test pieces 14 are required to be developed aiming at a low-speed machine of a certain type, the test point arrangement, wiring and sensor packaging and other work are finished on each test piece, when the temperature field test is required to be carried out on the series of low-speed machines, the temperature field test can be carried out quickly only by replacing the corresponding parts of the low-speed machine with the developed universal piston, cylinder cover, cylinder sleeve and exhaust valve sensing test pieces 14, and time and labor are saved.
(3) The visual design of the temperature field test adopts a three-dimensional visual cloud picture model display method, develops a visual and novel combustion chamber part temperature field test system, increases the integrity and the relevance of the low-speed engine combustion chamber part display, and improves the efficiency of temperature field test data analysis.
(4) And long thermocouple sensors short thermocouple sensors are arranged in each measuring point hole of the piston, the cylinder cover and the cylinder sleeve sensing test piece, and the distance difference is arranged in the direction of the hole diameter, so that the measurement of the temperature gradient is realized.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1, visual online test system of marine low-speed machine combustion chamber spare part temperature field, its characterized in that includes:
the temperature field sensing test piece comprises a piston sensing test piece, a cylinder cover sensing test piece, a cylinder sleeve sensing test piece and an exhaust valve sensing test piece, wherein thermocouple sensors for sensing temperature are embedded in the sensing test piece, the sensing test piece is firmly packaged, meets the working condition requirement of a combustion chamber, and is provided with an external temperature signal transmission interface;
the signal integrated acquisition device comprises a piston wireless acquisition device and a cylinder cover, a cylinder sleeve and an exhaust valve wired acquisition device, and realizes the integrated acquisition of wireless and wired signals;
the visual online test module is used for dividing grids of all parts by establishing a three-dimensional model of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve, and mapping the acquired and communicated temperature signals into the three-dimensional model through a spatial interpolation algorithm by utilizing a grid mapping principle to realize visual display of the whole temperature field distribution of the three-dimensional model of the piston, the cylinder sleeve, the cylinder cover and the exhaust valve.
2. The visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed engine as claimed in claim 1, wherein the diameter of the through hole of each measuring point of the piston perception test piece is determined according to the size of the piston and is more than 2 times of the diameter of the thermocouple sensor.
3. The visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed engine as claimed in claim 1, wherein the diameter of the blind hole of each measuring point of the cylinder cover sensing test piece is determined according to the size of the cylinder cover and is more than 2 times of the diameter of the thermocouple sensor.
4. The visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed machine as claimed in claim 1, wherein the diameter of the blind hole of each measuring point of the cylinder liner sensing test piece is determined according to the size of the cylinder liner and is more than 2 times of the diameter of the thermocouple sensor.
5. The visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed machine is characterized in that an axial groove is milled in the upper portion of the exhaust valve sensing test piece, the length of the axial groove is larger than the lift range of the exhaust valve, a positioning hole and a lead hole are drilled in the casing of the exhaust valve, the positioning hole is used for fixing a positioning pin, the positioning pin can be inserted into the axial groove and used for restraining the circumferential rotation of the exhaust valve, and the lead hole is used for a lead of a thermocouple sensor of the exhaust valve.
6. The visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed machine as claimed in claim 1, wherein the wireless piston acquisition device comprises an acquisition and signal transmitter, a signal receiver and a signal conditioner; the acquisition and signal transmitter is arranged at the lower part of a low-speed machine piston group, the signal receiver is fixed at the bottom of a low-speed machine cylinder sleeve, and an external temperature signal interface on the piston perception test piece is connected with the acquisition and signal transmitter; the signal conditioning machine is arranged outside the low-speed machine for the ship and connected with the signal receiver through a signal wire, and the signal conditioning machine is connected with a PC (personal computer) with a test system.
7. The visual online test system for the temperature field of the parts of the combustion chamber of the marine low-speed machine as claimed in claim 1, wherein the wired acquisition devices of the cylinder cover, the cylinder sleeve and the exhaust valve are installed outside the marine low-speed machine and are respectively connected with external temperature signal interfaces on the cylinder cover sensing test piece, the cylinder sleeve sensing test piece and the exhaust valve sensing test piece through signal lines; the wired acquisition device comprises a power module, an acquisition card and an Ethernet communication module, wherein the power module supplies power to the acquisition card, and the Ethernet communication module is connected with a PC (personal computer) with a test system and used for signal transmission.
8. The visual online test system for the temperature field of the parts of the marine low-speed engine combustor according to claim 1, wherein the visual online test module specifically comprises the following steps:
(1) drawing a three-dimensional model of the sensing test piece of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve, drawing a grid, obtaining grid node coordinates, and determining the position relation between a thermocouple sensor measuring point and a model node;
(2) setting weight coefficient omega of spatial interpolation algorithm according to position relationiJudging whether the measuring point of the thermocouple sensor coincides with the grid node, calculating the weight coefficient of each thermocouple sensor point to the grid node, and calculating the interpolation result of each grid node according to a distance reciprocal interpolation algorithm;
(3) and giving corresponding rendering color values to the grid nodes through the scale attributes of the color bars, so as to obtain a real-time three-dimensional temperature field representation image of the whole model, and be used for carrying out real-time online display on different test piece models.
9. The visual online test system for the temperature field of the parts of the marine low-speed engine combustor according to claim 8, wherein the visual online test module further comprises a parameter setting module, a multi-mode display module, and a data saving and playback module; the parameter setting module is used for setting parameters of the thermocouple sensors of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve, and parameters of the acquisition channel and the acquisition device; the multi-mode display module is used for displaying the visual online temperature field of the parts of the piston, the cylinder cover, the cylinder sleeve and the exhaust valve; and the data storage and playback module is used for realizing the functions of storing and playing back according to the set temperature signal channel.
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