CN109612631B - Engine rotational inertia measuring device - Google Patents
Engine rotational inertia measuring device Download PDFInfo
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- CN109612631B CN109612631B CN201811366183.3A CN201811366183A CN109612631B CN 109612631 B CN109612631 B CN 109612631B CN 201811366183 A CN201811366183 A CN 201811366183A CN 109612631 B CN109612631 B CN 109612631B
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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
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/10—Determining the moment of inertia
Abstract
The invention discloses an engine rotational inertia measuring device, which comprises a machine body, a driving mechanism, a belt transmission assembly and a connecting flange connected with an output end flange of an engine to be measured; the machine body comprises two bases and three supporting seats which are adjacently arranged; the driving mechanism comprises a motor and a speed reducer which are in transmission connection, and is arranged on the base and the supporting seat; the belt transmission assembly comprises a belt transmission mechanism, a belt tensioning mechanism and two rotating shafts, the two rotating shafts are rotatably connected with the two belt pulleys and the belt tensioning mechanism through four bearings, the first rotating shaft is fixedly connected with the output end of the speed reducer in a coaxial mode, the second rotating shaft is fixedly arranged at the center of the connecting flange, power output by the driving mechanism can be transmitted to an output end flange of the engine to be measured under the action of the belt transmission assembly, and the rotational inertia of the engine to be measured can be accurately measured by recording the change condition of the rotating speed and the torque of the output shaft of the engine. The invention has the advantages of compact structure, convenient assembly and disassembly, strong practicability and convenient popularization and use.
Description
Technical Field
The invention relates to the technical field of industrial test and evaluation, in particular to a device for measuring the total rotational inertia of a rotary motion part of an engine on site.
Background
At present, the detection and evaluation of the performance of the engine at home and abroad are mostly finished in a specially-arranged engine laboratory, special instruments, equipment and fields are needed, the test period is long, and the cost is high. The no-load power measuring technology is a detection means capable of quickly, conveniently and accurately evaluating the performance of the engine, and the working condition of the engine can be detected without transporting the engine from a working place to a laboratory.
The engine rotational inertia is not only a key parameter necessary for no-load power measurement of the engine, but also a parameter necessary for acquiring the instantaneous torque and the air cylinder compression pressure of the engine by utilizing the instantaneous rotating speed, and calculating the working pressure, the average effective indicating pressure and the like in the air cylinder. Therefore, the method has important practical significance for accurately acquiring the rotational inertia of the engine, provides a technical means for field evaluation of the performance of the engine, and realizes field measurement of the performance index of the engine.
The engine rotational inertia refers to the total rotational inertia of all rotating motion parts such as a crankshaft, a flywheel and the like to the motion axis of the crankshaft. Because of the influence of factors such as complex structure of engine parts, material density distribution, manufacturing errors and the like, direct calculation of the rotational inertia is very difficult, and the rotational inertia is often determined through tests. At present, the field measurement method of the rotational inertia of the engine mainly comprises an oil-cut idling method, an additional mass method, an instantaneous rotating speed method and the like, and the measurement equipment after engineering has many problems in the industrial application process. When the oil-stopping idling method is used, the friction torque and the deceleration of the engine in the oil-stopping idling process need to be measured, but the friction torque of the engine changes along with the change of the rotating speed and the change of the temperature of the engine body, is difficult to accurately measure in real time, and is not effectively solved temporarily. The measurement accuracy of the additional mass method is interfered by a plurality of factors such as uneven rotating speed, inertia force, the working condition of the engine, and the like, the real signal of the additional mass method is difficult to detect, the measurement data accuracy is limited, and the measurement error is large. The instantaneous rotating speed method needs to measure the pressure in an engine cylinder, is only suitable for engines with pressure test holes, and has the advantages of high measuring precision, complex operation and low practicability due to the fact that the measuring precision is greatly influenced by the rotating speed of the engines. Therefore, the existing measuring device has certain limitations in practical engineering application due to the fact that influence factors are more, and measuring accuracy and stability are not easy to guarantee.
Chinese patent documents with publication number of 107782498A and publication date of 2018, 3 and 9 disclose a system and a method for measuring equivalent rotational inertia of a diesel engine, wherein the system comprises transmission equipment, a small speed regulating motor, a motor control module, a rotating speed measuring module, an axle work measuring module and a data processing module; two ends of the transmission device are respectively connected with an output shaft of the diesel engine and a rotating shaft of the small speed regulating motor; the motor control module drives the motor to start, regulate and brake stably according to the transmission ratio of the transmission equipment and the rotating speed fed back by the rotating speed measuring module; the shaft work measuring module measures kinetic energy received by a motion assembly of the diesel engine in the process of being accelerated and dragged by the motor; the data processing module calculates the equivalent rotary inertia of the diesel engine according to the starting and stopping rotating speed value and the shaft work value in the acceleration process; the method adopts a mode that the diesel engine is dragged by the speed regulating motor, accurately measures and calculates the equivalent rotary inertia of the diesel engine by measuring the kinetic energy received by the diesel engine motion assembly in an acceleration time period, and has the advantages of high measurement precision, portable equipment, easiness in operation and the like.
In the prior art represented by the above patent documents, the transmission device is an elastic coupling, and in the actual use process, the transmission effect has no strong adaptability, and the impact and vibration cannot be effectively alleviated, and meanwhile, the transmission quality and precision are not accurate enough due to the elasticity of the elastic coupling, so that the measurement of the rotational inertia of the engine is influenced.
Disclosure of Invention
The invention aims to solve the problems of low measurement precision, poor stability, poor adaptability and the like in the prior art, and provides the engine rotational inertia measuring device which can effectively improve the measurement precision of the engine rotational inertia, has good stability and strong adaptability.
The invention is realized by adopting the following technical scheme:
an engine inertia measuring device, its characterized in that: comprises a machine body, a driving mechanism, a belt transmission assembly and a connecting flange;
the machine body comprises a base and a supporting component arranged at the upper end of the base;
the driving mechanism comprises a motor and a speed reducer and is arranged on the base;
the belt transmission assembly comprises a belt transmission mechanism, a belt tensioning mechanism and two rotating shafts which are arranged in parallel, the belt transmission mechanism comprises a first belt pulley, a second belt pulley and a transmission belt, the first belt pulley is fixedly arranged on the first rotating shaft, the second belt pulley is fixedly arranged on the second rotating shaft, and the first belt pulley is connected with the second belt pulley through the transmission belt to transmit the power of the first rotating shaft to the second rotating shaft; the belt tensioning mechanism is composed of two telescopic support rods which are equal in length and symmetrically arranged on two sides of the first belt pulley and the second belt pulley, two ends of each telescopic support rod are respectively rotatably connected with the first rotating shaft and the second rotating shaft, and the tensioning force and the enough wrap angle required by the transmission belt can be guaranteed by adjusting the lengths of the two telescopic support rods;
and the connecting flange is fixedly arranged at one end of the second rotating shaft and is used for being coaxially and fixedly connected with the second rotating shaft and the output end of the engine and transmitting the power of the second rotating shaft to the output end of the engine.
The base includes base A and base B that adjacent arrangement realizes the connection and the split of two bases through the bolt, base B top is provided with four waist shape holes that are used for fixing, the support component includes supporting seat one, supporting seat two and supporting seat three, all installs on base A.
The output end of the motor is in transmission connection with a speed reducer, the motor base is in adjustable connection with the base B through the waist-shaped hole, the position of the motor can be adjusted according to actual conditions, the motor base is convenient to assemble and disassemble, and a third supporting base is arranged between the lower part of the speed reducer and the base A;
the connecting flange is provided with four uniformly-arranged waist-shaped holes, the waist-shaped holes are tightly connected with the engine output end flange fixing holes through bolts, the second rotating shaft and the engine output end are fixedly connected in a coaxial mode, and power of the second rotating shaft is transmitted to the engine output end.
One end of the first rotating shaft is coaxially and fixedly connected with the output end of the speed reducer through a coupler.
The first rotating shaft is rotatably connected with the tops of the first supporting seat and the second supporting seat, and the first supporting seat and the second supporting seat are symmetrically arranged on two sides of the two telescopic supporting rods respectively, so that the belt transmission assembly is supported.
The belt transmission assembly further comprises six bearings which are fixedly nested in the tops of the first supporting seat and the second supporting seat and the two ends of the two telescopic supporting rods respectively, and the six bearings are rotatably connected with the first rotating shaft and the second rotating shaft respectively.
The axis of the first belt pulley is superposed with the central line of the driving mechanism and is parallel to the axis of the second belt pulley, and the symmetrical planes of the pulley grooves of the two belt pulleys are superposed, so that the eccentric condition is avoided.
Two scalable bracing pieces can separate from top to bottom completely, installs and removes the convenience, and the bracing piece surface mark has the scale of pole length, can be according to the length of scale mark adjustment scalable bracing piece, keeps and adjusts drive belt's elasticity, guarantees the transmission quality and the precision of power.
The measuring device can be suitable for engines of various models, realizes connection with output end flanges of engines of various sizes and specifications by adjusting the positions of the bolts on the waist-shaped holes of the connecting flanges, and improves the adaptability of the measuring device within a certain range.
The measuring device is structurally reserved with a sensor mounting space, and a proper sensor can be selected and mounted at a proper position according to actual conditions such as measuring conditions.
Compared with the prior art, the invention has the following beneficial effects:
1. the engine rotational inertia measuring device is characterized in that an output end flange of a static engine to be measured is fixedly connected with a measuring device connecting flange, a certain torque is applied to the engine through a motor, a speed reducer and a belt transmission assembly, the engine to be measured rotates along with the measuring device, at the moment, the continuous change of the rotating speed and the torque of an output shaft of the engine along with time is recorded, and the rotational inertia of the engine to be measured can be calculated. Therefore, the technical problems of difficulty in measuring friction torque, uneven rotating speed, limited data precision and the like in the prior art are effectively avoided, and the measuring precision and the stability of the rotational inertia of the engine are improved.
2. The engine rotational inertia measuring device adopts the belt transmission assembly to transmit motion and power, compared with other transmission modes, the belt transmission has stronger adaptability, a proper position can be selected to place the measuring device according to factors such as the position, the height, the layout space and the like of the engine to be measured, and the belt has good elasticity and can effectively alleviate impact and vibration.
3. According to the engine rotational inertia measuring device, the tightness of the belt can be kept and adjusted by adjusting the lengths of the two telescopic supporting rods, the transmission quality and precision are guaranteed, the transmission center distance can be adjusted according to actual conditions, the engine rotational inertia measurement under different conditions is met, and the engine rotational inertia measuring device has high flexibility.
4. The engine rotational inertia measuring device provided by the invention adopts the two telescopic support rods to provide enough tension for the belt, and meanwhile, the whole measuring device is uniformly stressed, the centering parallelism is good, and the working reliability and stability are high.
5. The engine rotational inertia measuring device can be connected with the output end flanges of engines with various dimensions by adjusting the positions of the bolts on the waist-shaped holes of the connecting flanges, and is high in practicability and convenient to popularize and use.
6. The engine rotational inertia measuring device can be disassembled and assembled in blocks, is convenient to carry, is simple, convenient and quick in disassembly and assembly processes, facilitates field measurement of the rotational inertia of the engine, and provides a technical means for field evaluation of the performance of the engine.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic perspective view of an engine rotational inertia measurement apparatus according to the present invention;
FIG. 2 is a schematic front view of an engine rotational inertia measurement apparatus of the present invention;
FIG. 3 is a top view of a base B of the engine rotational inertia measuring apparatus of the present invention;
FIG. 4 is a schematic structural diagram of a retractable support rod in the rotational inertia measuring apparatus of an engine according to the present invention;
FIG. 5 is a sectional view showing a partial structure of an engine rotational inertia measuring apparatus according to the present invention;
FIG. 6 is a side view of a coupling flange in the engine rotational inertia measurement apparatus of the present invention;
reference numerals:
1. the device comprises bases A, 2, bases B, 3, first supporting seats, 4, second supporting seats, 5, third supporting seats, 6, supporting parts, 7, a machine body, 8, a motor, 9, a speed reducer, 10, a driving mechanism, 11, first rotating shafts, 12, second rotating shafts, 13, telescopic supporting rods, 14, first belt pulleys, 15, second belt pulleys, 16, a belt transmission assembly, 17, a connecting flange, 18, a coupler and 19, the bearing comprises a transmission belt, 20, an upper bearing seat, 21, a hollow pipe, 22, a first locking nut, 23, a second locking nut, 24, a threaded screw rod, 25, a supporting upright post, 26, a lower bearing seat, 27, a first bearing, 28, a second bearing, 29, a first retaining ring, 30, a second retaining ring, 31, a third retaining ring, 32, a first fixed key, 33, a second fixed key, 34, a countersunk screw, 35, a flange kidney-shaped hole, 36, a connecting bolt, 37 and a base kidney-shaped hole.
Detailed Description
Example 1
In the description of the present invention, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", "end", "front", "side", "top", "symmetrical", etc. indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, and should not be construed as limiting the present invention.
As a preferred embodiment of the present invention, there is disclosed an engine rotational inertia measuring apparatus, characterized in that: comprises a machine body 7, a driving mechanism 10, a belt transmission assembly 16 and a connecting flange 17; the machine body 7 comprises a base and a supporting component 6 arranged at the upper end of the base; the driving mechanism 10 comprises a motor 8 and a speed reducer 9, and the driving mechanism 10 is arranged on the base; the belt transmission assembly 16 comprises a belt transmission mechanism, a belt tensioning mechanism and two rotating shafts which are arranged in parallel, the belt transmission mechanism comprises a first belt pulley 14, a second belt pulley 15 and a transmission belt 19, the first belt pulley 14 is fixedly arranged on the first rotating shaft 11, the second belt pulley 15 is fixedly arranged on the second rotating shaft 12, and the first belt pulley 14 is connected with the second belt pulley 15 through the transmission belt 19 to transmit the power of the first rotating shaft 11 to the second rotating shaft 12; the belt tensioning mechanism is composed of two telescopic support rods 13 which are equal in length and symmetrically arranged on two sides of a first belt pulley 14 and a second belt pulley 15, two ends of each telescopic support rod 13 are rotatably connected with a first rotating shaft 11 and a second rotating shaft 12 respectively, and the length of the two telescopic support rods 13 is adjusted to ensure the tensioning force and the enough wrap angle required by a transmission belt 19; the connecting flange 17 is fixedly arranged at one end of the second rotating shaft 12, and the connecting flange 17 is used for being coaxially and fixedly connected with the second rotating shaft 12 and the output end of the engine and transmitting the power of the second rotating shaft 12 to the output end of the engine.
Example 2
As a preferred embodiment of the present invention, as shown in fig. 1 to 6, the engine rotational inertia measuring apparatus of the present invention includes a body 7, a driving mechanism 10, a belt transmission assembly 16, and a connecting flange 17;
the machine body 7 comprises a base A1, a base B2 and a supporting part 6, wherein the base A1 and the base B2 are arranged adjacently, the connection and the disconnection of the two bases can be realized through bolts, the upper end of the base B2 is provided with four waist-shaped holes 37 for fixing, and the supporting part 6 comprises a first supporting seat 3, a second supporting seat 4 and a third supporting seat 5 which are all arranged on a base A1;
the driving mechanism 10 comprises a motor 8 and a speed reducer 9, the output end of the motor 8 is in transmission connection with the speed reducer 9, the base of the motor 8 is in adjustable connection with a base B2 through the waist-shaped hole 37, the position of the motor 8 can be adjusted according to actual conditions, assembly and disassembly are convenient, and a supporting seat III 5 is arranged between the lower part of the speed reducer 9 and the base A1;
the belt transmission assembly 16 comprises a first rotating shaft 11, a second rotating shaft 12, a first belt pulley 14, a second belt pulley 15, a transmission belt 19 and two telescopic support rods 13, wherein the first belt pulley 14 is fixedly arranged on the first rotating shaft 11, the second belt pulley 15 is fixedly arranged on the second rotating shaft 12, and the first belt pulley 14 is connected with the second belt pulley 15 through the transmission belt 19 to transmit the power of the first rotating shaft 11 to the second rotating shaft 12; two telescopic support rods 13 with the same length are symmetrically arranged on two sides of the first belt pulley 14 and the second belt pulley 15, two ends of each telescopic support rod 13 are respectively and rotatably connected with the first rotating shaft 11 and the second rotating shaft 12, and the required tension and the enough wrap angle of the transmission belt 19 can be ensured by adjusting the lengths of the two telescopic support rods 13;
the fixed setting of flange 17 is in the one end of two 12 of pivot, the last waist shape hole 35 that is provided with four evenly arranged of flange 17 passes through bolt 36 waist shape hole 35 and engine output end flange fixed orifices fastening connection realize two 12 of pivot and the coaxial fixed connection of engine output, give the engine output with the power transmission of two 12 of pivot.
One end of the first rotating shaft 11 is connected with the output end of the speed reducer 9 in a coaxial and fixed mode through the coupler 18, the first rotating shaft 11 is connected with the first supporting seat 3 and the second supporting seat 4 in a rotatable mode, the first supporting seat 3 and the second supporting seat 4 are symmetrically placed on two sides of the two telescopic supporting rods 13 respectively, and the belt transmission assembly 16 is supported.
The axis of the first belt pulley 14 is superposed with the central line of the driving mechanism 10 and is parallel to the axis of the second belt pulley 15, and the symmetrical planes of the pulley grooves of the two belt pulleys are superposed, so that the eccentric condition is avoided.
As shown in fig. 1 and 4, in this embodiment, the telescopic supporting rod 13 is composed of an upper bearing seat 20, a hollow tube 21, a first locking nut 22, a second locking nut 23, a threaded lead screw 24, a supporting upright 25 and a lower bearing seat 26, the upper bearing seat 20 and the lower bearing seat 26 are rotatably connected with a second rotating shaft 12 and a first rotating shaft 11 respectively through bearings nested inside, the top and the bottom of the supporting upright 25 are fixedly connected with the threaded lead screw 24 and the lower bearing seat 26 respectively, and the top of the hollow tube 21 is fixedly connected with the upper bearing seat 20. The outer surface of the threaded screw rod 24 is provided with external threads, and the diameter of the threaded screw rod 24 is slightly smaller than the inner diameter of the hollow pipe 21. When the support rod is used, the length of the threaded screw rod 24 extending into the hollow tube 21 is adjusted by rotating the first locking nut 22 and the second locking nut 23 which are connected with each other through the threads on the threaded screw rod 24, so that the length of the whole support rod 13 is adjusted. The outer surface of the threaded screw rod 24 is marked with scales of the length of the whole support rod 13, the lengths of the two support rods 13 can be adjusted according to the scale marks, the equal length and the uniform stress of the two support rods can be guaranteed, the transmission center distance can be read visually, and the transmission quality and precision are guaranteed. The locking mode of the opposite-top nut is adopted, the structure is simple, the operation is convenient, and the reliability is high; and the upper and lower parts of the whole supporting rod 13 can be completely separated, so that the assembly and disassembly are convenient, and the carrying is convenient.
As shown in fig. 1 and fig. 5, in this embodiment, the upper bearing seat 20 of the retractable supporting rod 13 is coupled with an outer ring of the first bearing 27 by interference fit, an inner ring of the first bearing 27 is also coupled with the second rotating shaft 12 by interference fit, and the second rotating shaft 12 is rotatably connected with the two supporting rods 13 through the first bearing 27 and the second bearing 28. The second rotating shaft 12 is fixedly connected with the second belt pulley 15 and the connecting flange 17 in the circumferential direction through a first fixing key 32 and a second fixing key 33. The second rotating shaft 12 is axially provided with a plurality of shoulders, and the first retainer ring 29, the second retainer ring 30 and the third retainer ring 31 are combined, so that the supporting rods 13 with two embedded bearings and the second belt pulley 15 are positioned and fixed in the axial direction of the second rotating shaft 12, the assembly is stable, and the disassembly is convenient. The second rotating shaft 12 is a hollow shaft, and an internal thread is processed at one end of the second rotating shaft. The countersunk head screw 34 penetrates through the center of the connecting flange 17 to be in threaded connection with the second rotating shaft 12, so that the axial positioning and fixing of the connecting flange 17 on the second rotating shaft 12 are realized, and the coaxiality of the connecting flange 17 and the rotating shaft 12 in connection is further improved.
As shown in fig. 6, in this embodiment, the measuring device can be applied to engines of various models, and the connection with the output end flanges of engines of various sizes and specifications is realized by adjusting the positions of the bolts 36 on the waist-shaped holes 35 of the connecting flange, so that the adaptability of the measuring device is improved within a certain range.
In this embodiment, the measuring device is structurally reserved with a sensor installation space, and during specific implementation, a suitable sensor can be selected and installed at a suitable position according to actual conditions such as measurement conditions.
The working principle of the engine rotational inertia measuring device is as follows:
fixedly connecting an output end flange of a static engine to be tested with a connecting flange 17 of the measuring device, adjusting the lengths of two telescopic support rods 13, tensioning a belt 19, applying a certain torque to the engine through a motor 8, a speed reducer 9 and a belt transmission assembly 16, enabling the engine to be tested to rotate from the static state along with the measuring device, and recording the rotating speed n of an output shaft of the engineiAnd torque TiAnd (4) calculating the rotational inertia J of the engine to be measured along with the continuous change of the time t.
During measurement, the engine is dragged by the measuring device to accelerate from rest to a certain dynamic balance rotating speed, and the rotating speed n before dynamic balance is interceptediAnd torque TiThe multiple groups of data can calculate the acceleration time t of the engine0Internal shaft power Pi：
The kinetic energy W obtained by the engine motion assembly to be measured can be obtained through integral operation:
according to the law of conservation of energy, the method comprises the following steps:
wherein: j-engine moment of inertia
Omega-engine acceleration end point angular velocity
n is the engine acceleration end rotation speed;
according to the three mathematical relations, the moment of inertia J of the engine to be measured is as follows:
the above description is only for the preferred embodiment of the present invention, but the implementation manner of the present invention is not limited by the above embodiment, and any person skilled in the art should fall within the protection scope of the present invention without departing from the concept and principle of the present invention.
Claims (10)
1. An engine inertia measuring device, its characterized in that: comprises a machine body (7), a driving mechanism (10), a belt transmission assembly (16) and a connecting flange (17);
the machine body (7) comprises a base and a supporting component (6) arranged at the upper end of the base;
the driving mechanism (10) comprises a motor (8) and a speed reducer (9), and the driving mechanism (10) is arranged on the base;
the belt transmission assembly (16) comprises a belt transmission mechanism, a belt tensioning mechanism and two rotating shafts which are arranged in parallel, the belt transmission mechanism comprises a first belt pulley (14), a second belt pulley (15) and a transmission belt (19), the first belt pulley (14) is fixedly arranged on the first rotating shaft (11), the second belt pulley (15) is fixedly arranged on the second rotating shaft (12), and the first belt pulley (14) is connected with the second belt pulley (15) through the transmission belt (19) to transmit the power of the first rotating shaft (11) to the second rotating shaft (12); the belt tensioning mechanism is composed of two telescopic support rods (13) which are equal in length and symmetrically arranged on two sides of a first belt pulley (14) and a second belt pulley (15), and two ends of each telescopic support rod (13) are rotatably connected with a first rotating shaft (11) and a second rotating shaft (12) respectively;
and the connecting flange (17) is fixedly arranged at one end of the second rotating shaft (12), and the connecting flange (17) is used for being coaxially and fixedly connected with the second rotating shaft (12) and the output end of the engine and transmitting the power of the second rotating shaft (12) to the output end of the engine.
2. An engine moment of inertia measurement device as set forth in claim 1, wherein: the base includes base A (1) and base B (2) that adjacent arranged, realizes the connection and the split of two bases through the bolt, base B (2) top is provided with four waist shape holes that are used for fixing, support component (6) are all installed including supporting seat one (3), supporting seat two (4) and supporting seat three (5) on base A (1).
3. An engine moment of inertia measurement device as set forth in claim 2, wherein: the output end of the motor (8) is in transmission connection with the speed reducer (9), the base of the motor (8) is in adjustable connection with the base B (2) through the waist-shaped hole, and a third supporting seat (5) is arranged between the lower portion of the speed reducer (9) and the base A (1).
4. An engine moment of inertia measurement device as set forth in claim 3, wherein: four waist-shaped holes which are uniformly distributed are formed in the connecting flange (17), and the connecting flange penetrates through the waist-shaped holes through bolts to be fixedly connected with the fixing holes of the engine output end flange.
5. An engine moment of inertia measurement device as set forth in claim 1, wherein: one end of the first rotating shaft (11) is coaxially and fixedly connected with the output end of the speed reducer (9) through a coupler (18).
6. An engine moment of inertia measurement device as set forth in claim 4, wherein: the first rotating shaft (11) is rotatably connected with the tops of the first supporting seat (3) and the second supporting seat (4), and the first supporting seat (3) and the second supporting seat (4) are symmetrically arranged on two sides of the two telescopic supporting rods (13) respectively.
7. An engine moment of inertia measurement device as set forth in claim 1, wherein: the belt transmission assembly (16) further comprises six bearings which are fixedly nested in the top of the first supporting seat (3), the top of the second supporting seat (4) and the two ends of the two telescopic supporting rods (13) respectively, and the six bearings are rotatably connected with the first rotating shaft (11) and the second rotating shaft (12) respectively.
8. An engine moment of inertia measurement device as set forth in claim 1, wherein: the axis of the first belt pulley (14) is superposed with the central line of the driving mechanism (10) and is parallel to the axis of the second belt pulley (15), and the symmetrical planes of the wheel grooves of the two belt pulleys are superposed.
9. An engine moment of inertia measurement device as set forth in claim 1, wherein: the surface of the telescopic supporting rod (13) is marked with rod length scales.
10. An engine moment of inertia measurement device as set forth in claim 1, wherein: the measuring device is provided with a sensor mounting space on the structure.
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| CN113092005B (en) * | 2021-03-26 | 2023-04-21 | 中国船舶工业集团公司第七0八研究所 | Ship propeller rotor water rotation inertia test determination method and application |
| CN113432785B (en) * | 2021-06-01 | 2022-09-09 | 中国航空工业集团公司沈阳飞机设计研究所 | Method for measuring rotational inertia of aero-engine under unloaded condition |
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