A high-speed high-power diesel engine shafting simulation verification system and test method

Abstract

This invention discloses a high-speed, high-power diesel engine shaft system simulation verification system and test method, including a diesel engine crankshaft. The diesel engine crankshaft is mounted on a base platform via bearing housing I, bearing housing II, and bearing housing III. A driven gear is mounted on the outer side of the diesel engine crankshaft, and the driven gear meshes with a drive motor gear on a drive motor. A shock absorber is mounted on the free end of the diesel engine crankshaft for frequency tuning and vibration reduction of the diesel engine crankshaft shaft system. The other end of the diesel engine crankshaft is connected to a gearbox, which contains a transmission gear, intermediate gear I, a seawater pump gear, intermediate gear II, intermediate gear III, a freshwater pump gear, and a high-pressure oil pump gear. This high-speed, high-power diesel engine shaft system simulation verification system and test method can simultaneously verify the crankshaft, freshwater pump, seawater pump, and high-pressure oil pump, simulating the actual operating state of the diesel engine after installation, and ensuring the accuracy of the test data.

Description

Technical Field

[0001] This invention relates to the field of diesel engine testing technology, specifically to a high-speed, high-power diesel engine shaft system simulation verification system and test method. Background Technology

[0002] Diesel engines are widely used in various fields due to their excellent thermal efficiency and power performance. Among them, the shaft system of a diesel engine (including crankshaft, fresh water pump, seawater pump, and fuel pump) is the most important system of a diesel engine and plays a vital role in the operation of the entire diesel engine.

[0003] Traditional verification platforms only verify individual components such as crankshafts, freshwater pumps, seawater pumps, and high-pressure oil pumps. They cannot truly simulate the actual operating state of a diesel engine after installation, resulting in significant differences between platform test results and installation test data. This is detrimental to product development and the production and operation activities of diesel engine manufacturers. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a high-speed, high-power diesel engine shaft system simulation verification system and test method, which can simultaneously verify the crankshaft, fresh water pump, seawater pump and high-pressure oil pump, simulate the actual operating state after the diesel engine is installed, ensure the accuracy of test data, and effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-speed, high-power diesel engine shaft system simulation verification system, comprising a diesel engine crankshaft, wherein the diesel engine crankshaft is mounted on a base platform via bearing housing I, bearing housing II, and bearing housing III, a driven gear is mounted on the outer side of the diesel engine crankshaft, the driven gear meshes with a drive motor gear on a drive motor, and a shock absorber is mounted on the free end of the diesel engine crankshaft for frequency tuning and vibration reduction of the diesel engine crankshaft shaft system;

[0006] The other end of the diesel engine crankshaft is connected to the gearbox. The gearbox contains a transmission gear, intermediate gear I, seawater pump gear, intermediate gear II, intermediate gear III, freshwater pump gear, and high-pressure oil pump gear. The other end of the diesel engine crankshaft is connected to the transmission gear. Test gear I and test gear II are respectively sleeved on the outer side of the diesel engine crankshaft. Test gear I is installed near the driven gear. A speed sensor I is installed on test gear I to measure the speed of the free end of the diesel engine crankshaft.

[0007] The test gear II is installed near the transmission gear, and a speed sensor II is installed on the test gear II for measuring the speed at the end of the diesel engine crankshaft gear.

[0008] The upper end of the transmission gear is connected to the seawater pump gear on the seawater pump through the intermediate gear I, which is used to test the performance of the seawater pump. The seawater pump is mounted on the foundation platform through the seawater pump base.

[0009] The lower end of the transmission gear meshes with the freshwater pump gear on the freshwater pump via intermediate gear II, which is used to test the performance of the freshwater pump. The freshwater pump is mounted on the foundation platform via the freshwater pump base.

[0010] Intermediate gear II and intermediate gear III are coaxially connected. Intermediate gear III meshes with the high-pressure oil pump gear on the high-pressure oil pump and is used to test the performance of the high-pressure oil pump. The high-pressure oil pump is mounted on the base platform via a high-pressure oil pump base.

[0011] As a preferred embodiment of the present invention, the inlet of the seawater pump is connected to the seawater tank through seawater pipe I, seawater flow meter and seawater pipe II, and the seawater flow meter is used to record the inlet flow rate of the seawater pump;

[0012] The seawater pump is equipped with a seawater pipe III and a control valve I at its outlet. The seawater pipe I is equipped with a temperature sensor I and a pressure sensor I to measure the inlet water temperature and pressure of the seawater pump. The seawater pipe III is equipped with a pressure sensor II to measure the seawater pressure at the outlet of the seawater pump.

[0013] As a preferred technical solution of the present invention, the inlet of the freshwater pump is connected to the freshwater tank through freshwater pipe I, freshwater flow meter and freshwater pipe II, and the freshwater flow meter is used to record the inlet flow of the freshwater pump.

[0014] Freshwater pipe III and control valve II are installed at the outlet of the freshwater pump. Temperature sensor II and pressure sensor III are installed on freshwater pipe I to measure the freshwater temperature and pressure at the inlet of the freshwater pump. Pressure sensor IV is installed on freshwater pipe III to measure the freshwater pressure at the outlet of the freshwater pump.

[0015] As a preferred embodiment of the present invention, the inlet of the high-pressure oil pump is connected to the fuel tank through fuel pipe I, fuel flow meter, and fuel pipe II, and a fuel injection system is installed at the outlet of the high-pressure oil pump, with the fuel from the fuel injection system returning to the fuel tank.

[0016] The fuel flow meter is used to record the inlet flow of the high-pressure fuel pump. The fuel pipe I is equipped with a temperature sensor III and a pressure sensor V to measure the inlet fuel temperature and fuel pressure of the high-pressure fuel pump.

[0017] As a preferred embodiment of the present invention, an oil pump is installed on the base platform. The oil pump is connected to the bearing housing I, bearing housing II, bearing housing III and gearbox via oil pipe I, oil pipe II, oil pipe III and oil pipe IV, respectively, to provide the oil required for lubrication.

[0018] As a preferred embodiment of the present invention, vibration sensor I and vibration sensor II are respectively provided on both sides of bearing seat I, vibration sensor III and vibration sensor IV are respectively provided on both sides of bearing seat II, vibration sensor V and vibration sensor VI are respectively provided on both sides of bearing seat III, vibration sensor VII is installed on the seawater pump base, vibration sensor VIII is installed on the freshwater pump base, and vibration sensor IX is installed on the high-pressure oil pump base.

[0019] The output terminals of vibration sensor I, vibration sensor II, vibration sensor III, vibration sensor IV, vibration sensor V, vibration sensor VI, vibration sensor VII, vibration sensor VIII, vibration sensor IX, speed sensor I, and speed sensor II are all connected to data acquisition box I, and the input terminal of data acquisition box I is connected to host computer I.

[0020] The output terminals of the drive motor, oil pump, and high-pressure oil pump are connected to the data acquisition box II, and the input terminal of the data acquisition box II is connected to the output terminal of the host computer II.

[0021] As a preferred embodiment of the present invention, a counterweight I and a counterweight II are respectively installed on the crankshaft of the diesel engine. The counterweight I is located between the bearing housing I and the bearing housing II, and the counterweight II is located between the bearing housing II and the bearing housing III.

[0022] A test method for a high-speed, high-power diesel engine shaft system simulation verification system includes a shock absorber performance test method, a seawater pump performance test method, a freshwater pump performance test method, and a high-pressure oil pump performance test method.

[0023] The shock absorber performance test method includes: before and after the shock absorber replacement, the host computer II controls the drive motor through the data acquisition box II to make the diesel engine crankshaft rotate at different speeds. The speed sensor I and the speed sensor II collect the speed signals of the free end and gear end of the diesel engine crankshaft. The data acquisition box I transmits the collected speed signals of the speed sensor I and the speed sensor II to the host computer I to analyze the fluctuation of the diesel engine crankshaft at different speeds before and after the shock absorber replacement.

[0024] Vibration signals from vibration sensors I, II, III, IV, V, VI, VII, VIII, and IX are collected by data acquisition box I and transmitted to host computer I. This allows for analysis of the impact of diesel engine crankshaft speed fluctuations on the vibration of seawater pumps, freshwater pumps, and high-pressure oil pumps before and after the shock absorber replacement.

[0025] The seawater pump performance test method includes: the host computer II controls the speed of the diesel engine crankshaft through the data acquisition box II, so that the seawater pump outlet pressure is adjusted by the control valve I at different speeds, the inlet pressure of the seawater pump is obtained by the pressure sensor I, and the seawater flow rate at different speeds and pressures is obtained by the seawater flow meter. By analyzing the changes in the seawater pump inlet pressure, outlet pressure and seawater flow rate, the flow performance of the seawater pump is evaluated. At the same time, the vibration performance of the seawater pump is evaluated based on the vibration data of the vibration sensor VII at different speeds and pressures.

[0026] The freshwater pump performance test method includes: the host computer II controls the speed of the diesel engine crankshaft through the data acquisition box II to control the drive motor, so that the freshwater pump outlet pressure is adjusted by the control valve II at different speeds, the inlet pressure of the freshwater pump is obtained by the pressure sensor IV, and the freshwater flow rate at different speeds and pressures is obtained by the freshwater flow meter. By analyzing the changes in the inlet pressure, outlet pressure and seawater flow rate of the freshwater pump, the flow performance of the freshwater pump is evaluated. At the same time, the vibration performance of the freshwater pump is evaluated based on the vibration data of the vibration sensor VIII at different speeds and pressures.

[0027] The high-pressure oil pump performance test method includes: the host computer II controls the drive motor to control the speed of the diesel engine crankshaft through the data acquisition box II, so that the high-pressure oil pump operates at different speeds. The host computer II issues commands to the fuel injection system through the data acquisition box II to adjust different rail pressures and injection quantities. The fuel flow rate at different speeds, rail pressures, and injection quantities is obtained through the fuel flow meter. By analyzing the changes in the flow rate of the high-pressure oil pump under different speeds, rail pressures, and injection quantities, the flow performance of the high-pressure oil pump is evaluated. At the same time, the vibration performance of the high-pressure oil pump is evaluated based on the vibration data of the vibration sensor VIX at different speeds, rail pressures, and injection quantities.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the high-speed, high-power diesel engine shaft system simulation verification system and test method can simultaneously realize the systematic verification of the diesel engine crankshaft, seawater pump, freshwater pump and high-pressure oil pump, and can also separately verify the performance of the crankshaft, seawater pump, freshwater pump and high-pressure oil pump, truly simulating the actual operating state of the diesel engine after installation, reducing the difference between platform test results and installation test data, improving the accuracy of product development and improving production and operation efficiency. Attached Figure Description

[0029] Figure 1 This is a structural system diagram of the present invention.

[0030] In the diagram: 1 Shock absorber, 2 Diesel engine crankshaft, 3 Driven gear, 4 Test gear I, 5 Bearing housing I, 6 Bearing housing II, 7 Bearing housing III, 8 Test gear II, 9 Transmission gear, 10 Intermediate gear I, 11 Seawater pump gear, 12 Seawater pump, 13 Seawater pump base, 14 Seawater tank, 15 Seawater flow meter, 16 Seawater pipe I, 17 Pressure sensor I, 18 Temperature sensor I, 19 Seawater pipe II, 20 Control valve I, 21 Seawater pipe III, 22 Intermediate gear III, 23 High-pressure oil pump gear, 24 High-pressure oil pump, 25 High-pressure oil pump base, 26 Fuel flow meter, 27 Fuel tank, 28 Fuel pipe I, 29 Fuel injection system, 30 Pressure sensor V, 31 Temperature sensor III, 32 Fuel pipe II, 33 Intermediate gear II, 34 Freshwater pump, 35 Freshwater pump base, 36 Freshwater pipe I, 37 Freshwater flow meter, 38 Freshwater pipe II, 39 Freshwater pipe III, 40 Control valve II, 41 Freshwater tank, 42 ​​Freshwater pump gear, 43 Oil pump, 44 Oil pipe I, 45 Oil pipe II, 46 Oil pipe III, 47 Oil pipe IV, 48 Drive motor, 49 Drive motor gear, 50 Counterweight I, 51 Counterweight II, 52 Vibration sensor I, 53 Vibration sensor II, 54 Vibration sensor III, 55 Vibration sensor IV, 56 Vibration sensor V, 57 Vibration sensor VI, 58 Vibration sensor VII, 59 Vibration sensor VIII, 60 Vibration sensor IX, 61 Speed ​​sensor I, 62 Speed ​​sensor II, 63 Data acquisition box I, 64 Host computer I, 65 Data acquisition box II, 66 Host computer II, 67 Pressure sensor III, 68 Temperature sensor II, 69 Gearbox, 70 Base platform, 71 Pressure sensor II, 72 Pressure sensor IV. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments (for ease of description and understanding, the following refers to...). Figure 1(The above is described above). Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 The present invention provides a technical solution: a high-speed, high-power diesel engine shaft system simulation verification system, including a diesel engine crankshaft 2, which is mounted on a base platform 70 via bearing housing I5, bearing housing II6 and bearing housing III7;

[0033] A driven gear 3 is mounted on the outer side of the diesel engine crankshaft 2. The driven gear 3 meshes with the drive motor gear 49 on the drive motor 48, and the speed of the diesel engine crankshaft 2 is controlled by the drive motor 48.

[0034] A shock absorber 1 is installed at the free end of the diesel engine crankshaft 2 to adjust the frequency and reduce vibration of the diesel engine crankshaft system;

[0035] The other end of the diesel engine crankshaft 2 is connected to the gearbox 69. The gearbox 69 is equipped with a transmission gear 9, an intermediate gear I10, a seawater pump gear 11, an intermediate gear II33, an intermediate gear III22, a freshwater pump gear 42, and a high-pressure oil pump gear 23. The other end of the diesel engine crankshaft 2 is connected to the transmission gear 9, which transmits power to the seawater pump 12, the freshwater pump 34, and the high-pressure oil pump 24, respectively.

[0036] Test gear I4 and test gear II8 are respectively sleeved on the outer side of the diesel engine crankshaft 2. Test gear I4 is installed near the driven gear 3 and a speed sensor I61 is installed on test gear I4 to measure the speed of the free end of the diesel engine crankshaft 2. Test gear II8 is installed near the transmission gear 9 and a speed sensor II62 is installed on test gear II8 to measure the speed of the gear end of the diesel engine crankshaft 2.

[0037] The upper end of the transmission gear 9 is meshed with the seawater pump gear 11 on the seawater pump 12 through the intermediate gear I10, which is used to test the performance of the seawater pump. The seawater pump 12 is mounted on the base platform 70 through the seawater pump base 13.

[0038] The inlet of the seawater pump 12 is connected to the seawater tank 14 through the seawater pipe I16, the seawater flow meter 15 and the seawater pipe II19. The seawater pipe I16 is used to connect the seawater pump 12 and the seawater flow meter 15, and the seawater pipe II19 is used to connect the seawater flow meter 15 and the seawater tank 14. The seawater tank 14 stores a sufficient amount of seawater, and the seawater flow meter 15 is used to record the inlet flow rate of the seawater pump 12.

[0039] A seawater pipe III21 and a control valve I20 are installed at the outlet of the seawater pump 12. A temperature sensor I18 and a pressure sensor I17 are installed on the seawater pipe I16 to measure the inlet water temperature and pressure of the seawater pump 12. A pressure sensor II71 is installed on the seawater pipe III21 to measure the seawater pressure at the outlet of the seawater pump 12. The control valve I20 controls the outlet pressure of the seawater pump 12 to simulate the pipe resistance of an actual diesel engine.

[0040] The lower end of the transmission gear 9 is connected to the freshwater pump gear 42 on the freshwater pump 34 via the intermediate gear II 33, which is used to test the performance of the freshwater pump 34. The freshwater pump 34 is mounted on the base platform 70 via the freshwater pump base 35.

[0041] The inlet of the freshwater pump 34 is connected to the freshwater tank 41 through freshwater pipe I36, freshwater flow meter 37 and freshwater pipe II38. Freshwater pipe II38 is used to connect the freshwater flow meter 37 and the freshwater tank 41. The freshwater tank 41 is used to store a sufficient amount of freshwater. The freshwater flow meter 37 is used to record the inlet flow rate of the freshwater pump 34.

[0042] Freshwater pump 34 is equipped with a freshwater pipe III39 and a control valve II40 at its outlet. A temperature sensor II68 and a pressure sensor III67 are installed on the freshwater pipe I36 to measure the inlet freshwater temperature and pressure of freshwater pump 34. A pressure sensor IV72 is installed on the freshwater pipe III39 to measure the outlet freshwater pressure of freshwater pump 34. Control valve II40 controls the outlet pressure of freshwater pump 34 to simulate the pipe resistance of an actual diesel engine.

[0043] Intermediate gear II33 and intermediate gear III22 are coaxially connected. Intermediate gear III22 meshes with high-pressure oil pump gear 23 on high-pressure oil pump 24. This is used to test the performance of high-pressure oil pump 24. High-pressure oil pump 24 is mounted on base platform 70 via high-pressure oil pump base 25.

[0044] The inlet of the high-pressure fuel pump 24 is connected to the fuel tank 27 via fuel pipe I28, fuel flow meter 26, and fuel pipe II32. A fuel injection system 29 is installed at the outlet of the high-pressure fuel pump 24. The fuel output of the fuel injection system 29 returns to the fuel tank 27. Fuel pipe I28 is used to connect the high-pressure fuel pump 24 and the fuel flow meter 26. Fuel pipe II32 is used to connect the fuel flow meter 26 and the fuel tank 27. The fuel tank 27 stores a sufficient amount of fuel. The fuel flow meter 26 is used to record the fuel inlet flow of the high-pressure fuel pump 24.

[0045] Temperature sensor III31 and pressure sensor V30 are installed on fuel line I28 to measure fuel temperature and fuel pressure at the inlet of high-pressure fuel pump 24.

[0046] To ensure the lubrication performance of the entire simulation verification system, an oil pump 43 is installed on the base platform 70. The oil pump 43 is connected to the bearing housing I5, bearing housing II6, bearing housing III7 and gearbox 69 through oil pipes I44, II45, III46 and IV47 respectively, to provide the oil required for lubrication.

[0047] Vibration sensors I52 and II53 are respectively installed on both sides of bearing housing I5 to collect vibration signals from both sides of bearing housing I5. Vibration sensors III54 and IV55 are respectively installed on both sides of bearing housing II6 to collect vibration signals from both sides of bearing housing II6. Vibration sensors V56 and VI57 are respectively installed on both sides of bearing housing III7 to collect vibration signals from both sides of bearing housing III7. Vibration sensor VII58 is installed on seawater pump base 13 to collect vibration signals from seawater pump base 13. Vibration sensor VII58 is installed on freshwater pump base 35. I59 is used to collect vibration signals on the fresh water pump base 35. Vibration sensor IX60 is installed on the high-pressure oil pump base (25) to collect vibration signals on the high-pressure oil pump base 25. The output terminals of vibration sensor I52, vibration sensor II53, vibration sensor III54, vibration sensor IV55, vibration sensor V56, vibration sensor VI57, vibration sensor VII58, vibration sensor VIII59, vibration sensor IX60, speed sensor I61 and speed sensor II62 are all connected to data acquisition box I63. The input terminal of data acquisition box I63 is connected to host computer I64.

[0048] The output terminals of the drive motor 48, oil pump 43, and high-pressure oil pump 24 are connected to the data acquisition box II65. The input terminal of the data acquisition box II65 is connected to the output terminal of the host computer II66. The host computer II66 controls the speed of the drive motor 48 through the data acquisition box II65, thereby controlling the speed of the entire system. The host computer II66 controls the oil pump 43 through the data acquisition box II65 to complete the overall lubrication of the system. The host computer II66 controls the oil outlet pressure of the high-pressure oil pump 24 through the data acquisition box II65 to simulate and test the performance of the high-pressure oil pump 24.

[0049] A test method for a high-speed, high-power diesel engine shaft system simulation verification system includes a shock absorber performance test method, a seawater pump performance test method, a freshwater pump performance test method, and a high-pressure oil pump performance test method.

[0050] During the shock absorber performance test: Before and after the replacement of shock absorber 1, the host computer II66 controls the drive motor 48 through the data acquisition box II65 to make the diesel engine crankshaft 2 at different speeds. The speed sensor I61 and the speed sensor II62 collect the speed signals of the free end and gear end of the diesel engine crankshaft 2. The data acquisition box I63 transmits the collected speed signals of the speed sensor I61 and the speed sensor II62 to the host computer I64 to analyze the fluctuation of the diesel engine crankshaft 2 at different speeds before and after the replacement of shock absorber 1.

[0051] Vibration signals from vibration sensors I52, II53, III54, IV55, V56, VI57, VII58, VIII59, and IX60 are collected by data acquisition box I63 and transmitted to host computer I64. This allows analysis of the impact of speed fluctuations of diesel engine crankshaft 2 at different speeds on the vibration of seawater pump 12, freshwater pump 34, and high-pressure oil pump 24 before and after the replacement of shock absorber 1, and a comprehensive evaluation of the quality of shock absorber 1.

[0052] Furthermore, counterweights I50 and II51 are installed on the diesel engine crankshaft 2. Counterweight I50 is located between bearing housing I5 and bearing housing II6, and counterweight II51 is located between bearing housing II6 and bearing housing III7. By adding counterweights I50 and II51, the diesel engine crankshaft 2 is forced into an unbalanced state. The influence of the unbalanced position of the diesel engine crankshaft 2 on the speed and synchronization of the free end and gear end of the diesel engine crankshaft 2 at different speeds is analyzed. Then, the influence of the unbalance of the diesel engine crankshaft 2 and the position of the unbalanced position on the vibration of the diesel engine crankshaft 2 at different speeds is analyzed, as well as the influence on the vibration of the freshwater pump 34, the seawater pump 12 and the high-pressure oil pump 24.

[0053] During the performance test of the seawater pump: the host computer II66 controls the speed of the diesel engine crankshaft 2 via the data acquisition box II65, which controls the drive motor 48. The outlet pressure of the seawater pump 12 is adjusted by the control valve I20 at different speeds. The inlet pressure of the seawater pump 12 is obtained by the pressure sensor I17. The seawater flow rate at different speeds and pressures is obtained by the seawater flow meter 15. By analyzing the changes in the inlet pressure, outlet pressure and seawater flow rate of the seawater pump 12, the flow performance of the seawater pump 12 is evaluated. At the same time, the vibration performance of the seawater pump 12 is evaluated based on the vibration data of the vibration sensor VII58 at different speeds and pressures.

[0054] During the performance test of the freshwater pump: the host computer II66 controls the speed of the diesel engine crankshaft 2 via the data acquisition box II65, which controls the drive motor 48. This allows the freshwater pump 34 to operate at different speeds. The outlet pressure of the freshwater pump 34 is adjusted by the control valve II40. The inlet pressure of the freshwater pump 34 is obtained through the pressure sensor IV72. The freshwater flow rate at different speeds and pressures is obtained through the freshwater flow meter 37. By analyzing the changes in the inlet pressure, outlet pressure, and seawater flow rate of the freshwater pump 34, the flow performance of the freshwater pump 34 is evaluated. At the same time, the vibration performance of the freshwater pump 34 is evaluated based on the vibration data from the vibration sensor VIII59 at different speeds and pressures.

[0055] During the performance test of the high-pressure oil pump: the host computer II66 controls the drive motor 48 to control the speed of the diesel engine crankshaft 2 through the data acquisition box II65, so that the high-pressure oil pump 24 is at different speeds. The host computer II66 issues commands to the fuel injection system 29 through the data acquisition box II65 to adjust different rail pressures and injection quantities. The fuel flow rate under different speeds, rail pressures and injection quantities is obtained through the fuel flow meter 26. By analyzing the changes in the flow rate of the high-pressure oil pump 24 under different speeds, rail pressures and injection quantities, the flow performance of the high-pressure oil pump 24 is evaluated. At the same time, the vibration performance of the high-pressure oil pump 24 is evaluated based on the vibration data of the vibration sensor VIX60 under different speeds, rail pressures and injection quantities.

[0056] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed high-power diesel engine shaft system simulation verification system, comprising a diesel engine crankshaft (2) mounted on a base platform (70) through a bearing seat I (5), a bearing seat II (6) and a bearing seat III (7), an outer side of the diesel engine crankshaft (2) is provided with a driven gear (3), the driven gear (3) is in meshing connection with a driving motor gear (49) on a driving motor (48), characterized in that: A shock absorber (1) is installed at the free end of the diesel engine crankshaft (2) for frequency modulation and vibration reduction of the diesel engine crankshaft system. ​ The other end of the diesel engine crankshaft (2) is connected to the gearbox (69). The gearbox (69) is provided with a transmission gear (9), intermediate gear I (10), seawater pump gear (11), intermediate gear II (33), intermediate gear III (22), freshwater pump gear (42) and high-pressure oil pump gear (23). The other end of the diesel engine crankshaft (2) is connected to the transmission gear (9). Test gear I (4) and test gear II (8) are respectively sleeved on the outer side of the diesel engine crankshaft (2). Test gear I (4) is installed close to the driven gear (3). A speed sensor I (61) is installed on the test gear I (4) to measure the speed of the free end of the diesel engine crankshaft (2). The test gear II (8) is installed near the transmission gear (9), and a speed sensor II (62) is installed on the test gear II (8) to measure the speed at the end of the diesel engine crankshaft (2) gear. The upper end of the transmission gear (9) is connected to the seawater pump gear (11) on the seawater pump (12) through the intermediate gear I (10) for testing the performance of the seawater pump (12). The seawater pump (12) is mounted on the base platform (70) through the seawater pump base (13). The lower end of the transmission gear (9) is connected to the freshwater pump gear (42) on the freshwater pump (34) via the intermediate gear II (33) for testing the performance of the freshwater pump (34). The freshwater pump (34) is mounted on the base platform (70) via the freshwater pump base (35). The intermediate gear II (33) is coaxially connected with the intermediate gear III (22). The intermediate gear III (22) meshes with the high-pressure oil pump gear (23) on the high-pressure oil pump (24) to test the performance of the high-pressure oil pump (24). The high-pressure oil pump (24) is mounted on the base platform (70) through the high-pressure oil pump base (25).

2. The high-speed, high-power diesel engine shaft system simulation and verification system according to claim 1, characterized in that: The inlet of the seawater pump (12) is connected to the seawater tank (14) through seawater pipe I (16), seawater flow meter (15) and seawater pipe II (19). The seawater flow meter (15) is used to record the inlet flow of the seawater pump (12). The outlet of the seawater pump (12) is equipped with a seawater pipe III (21) and a control valve I (20). A temperature sensor I (18) and a pressure sensor I (17) are installed on the seawater pipe I (16) to measure the inlet water temperature and inlet water pressure of the seawater pump (12). A pressure sensor II (71) is installed on the seawater pipe III (21) to measure the outlet seawater pressure of the seawater pump (12).

3. The high-speed, high-power diesel engine shaft system simulation and verification system according to claim 1, characterized in that: The inlet of the freshwater pump (34) is connected to the freshwater tank (41) through freshwater pipe I (36), freshwater flow meter (37) and freshwater pipe II (38). The freshwater flow meter (37) is used to record the inlet flow of the freshwater pump (34). Freshwater pipe III (39) and control valve II (40) are installed at the outlet of the freshwater pump (34). Temperature sensor II (68) and pressure sensor III (67) are installed on the freshwater pipe I (36) to measure the inlet freshwater temperature and freshwater pressure of the freshwater pump (34). Pressure sensor IV (72) is installed on the freshwater pipe III (39) to measure the outlet freshwater pressure of the freshwater pump (34).

4. The high-speed, high-power diesel engine shaft system simulation and verification system according to claim 1, characterized in that: The inlet of the high-pressure oil pump (24) is connected to the fuel tank (27) through fuel pipe I (28), fuel flow meter (26), and fuel pipe II (32). A fuel injection system (29) is installed at the outlet of the high-pressure oil pump (24), and the oil from the fuel injection system (29) returns to the fuel tank (27). The fuel flow meter (26) is used to record the inlet flow of the high-pressure oil pump (24). The fuel pipe I (28) is equipped with a temperature sensor III (31) and a pressure sensor V (30) to measure the inlet fuel temperature and fuel pressure of the high-pressure oil pump (24).

5. The high-speed, high-power diesel engine shaft system simulation and verification system according to claim 1, characterized in that: An oil pump (43) is installed on the base platform (70). The oil pump (43) is connected to the bearing housing I (5), bearing housing II (6), bearing housing III (7), and gearbox (69) through oil pipe I (44), oil pipe II (45), oil pipe III (46), and oil pipe IV (47) respectively, for providing the oil required for lubrication.

6. The high-speed, high-power diesel engine shaft system simulation and verification system according to claim 5, characterized in that: Vibration sensor I (52) and vibration sensor II (53) are respectively provided on both sides of bearing housing I (5), vibration sensor III (54) and vibration sensor IV (55) are respectively provided on both sides of bearing housing II (6), vibration sensor V (56) and vibration sensor VI (57) are respectively provided on both sides of bearing housing III (7), vibration sensor VII (58) is installed on the seawater pump base (13), vibration sensor VIII (59) is installed on the freshwater pump base (35), and vibration sensor IX (60) is installed on the high-pressure oil pump base (25). The output terminals of vibration sensor I (52), vibration sensor II (53), vibration sensor III (54), vibration sensor IV (55), vibration sensor V (56), vibration sensor VI (57), vibration sensor VII (58), vibration sensor VIII (59), vibration sensor IX (60), speed sensor I (61), and speed sensor II (62) are all connected to data acquisition box I (63), and the output terminal of data acquisition box I (63) is connected to host computer I (64); The output ends of the drive motor (48), oil pump (43) and high-pressure oil pump (24) are connected to the data acquisition box II (65), and the output end of the data acquisition box II (65) is connected to the input end of the host computer II (66).

7. The high-speed, high-power diesel engine shaft system simulation and verification system according to claim 1, characterized in that: The diesel engine crankshaft (2) is equipped with counterweight I (50) and counterweight II (51), respectively. Counterweight I (50) is located between bearing housing I (5) and bearing housing II (6), and counterweight II (51) is located between bearing housing II (6) and bearing housing III (7).

8. The test method for a high-speed, high-power diesel engine shaft system simulation verification system according to any one of claims 2-7, characterized in that: This includes test methods for shock absorber performance, seawater pump performance, freshwater pump performance, and high-pressure oil pump performance; The shock absorber performance test method includes: before and after the shock absorber (1) is replaced, the host computer II (66) controls the drive motor (48) through the data acquisition box II (65) to make the diesel engine crankshaft (2) at different speeds. The speed sensor I (61) and the speed sensor II (62) collect the speed signals of the free end and gear end of the diesel engine crankshaft (2). The data acquisition box I (63) transmits the collected speed signals of the speed sensor I (61) and the speed sensor II (62) to the host computer I (64) to analyze the fluctuation of the diesel engine crankshaft (2) at different speeds before and after the shock absorber (1) is replaced. The vibration signals of vibration sensors I (52), II (53), III (54), IV (55), V (56), VI (57), VII (58), VIII (59), and IX (60) are collected by data acquisition box I (63) and transmitted to host computer I (64). The vibration signals can be analyzed to determine the impact of the speed fluctuation of the diesel engine crankshaft (2) at different speeds on the vibration of the seawater pump (12), freshwater pump (34), and high-pressure oil pump (24) before and after the replacement of the shock absorber (1). The seawater pump performance test method includes: the host computer II (66) controls the drive motor (48) to control the speed of the diesel engine crankshaft (2) through the data acquisition box II (65), so that the seawater pump (12) adjusts the outlet pressure of the seawater pump (12) through the control valve I (20) at different speeds, obtains the inlet pressure of the seawater pump (12) through the pressure sensor I (17), obtains the seawater flow rate at different speeds and pressures through the seawater flow meter (15), evaluates the flow performance of the seawater pump (12) by analyzing the changes in the inlet pressure, outlet pressure and seawater flow rate of the seawater pump (12), and evaluates the vibration performance of the seawater pump (12) based on the vibration data of the vibration sensor VII (58) at different speeds and pressures. The freshwater pump performance test method includes: the host computer II (66) controls the drive motor (48) to control the speed of the diesel engine crankshaft (2) through the data acquisition box II (65), so that the freshwater pump (34) adjusts the outlet pressure of the freshwater pump (34) through the control valve II (40) at different speeds, obtains the inlet pressure of the freshwater pump (34) through the pressure sensor IV (72), obtains the freshwater flow rate at different speeds and pressures through the freshwater flow meter (37), evaluates the flow performance of the freshwater pump (34) by analyzing the changes in the inlet pressure, outlet pressure and freshwater flow rate of the freshwater pump (34), and evaluates the vibration performance of the freshwater pump (34) based on the vibration data of the vibration sensor VIII (59) at different speeds and pressures. The high-pressure oil pump performance test method includes: the host computer II (66) controls the drive motor (48) to control the speed of the diesel engine crankshaft (2) through the data acquisition box II (65), so that the high-pressure oil pump (24) can operate at different speeds. The host computer II (66) issues instructions to the fuel injection system (29) through the data acquisition box II (65) to adjust different rail pressures and fuel injection quantities. The fuel flow rate under different speeds, rail pressures and fuel injection quantities is obtained through the fuel flow meter (26). By analyzing the flow rate changes of the high-pressure oil pump (24) under different speeds, rail pressures and fuel injection quantities, the flow performance of the high-pressure oil pump (24) is evaluated. At the same time, the vibration performance of the high-pressure oil pump (24) is evaluated based on the vibration data of the vibration sensor IX (60) under different speeds, rail pressures and fuel injection quantities.

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