An engine test bench bearing oil thermal cycle measurement system

Abstract

The present invention relates to an engine test bench bearing lubricating oil thermal cycle measurement system, comprising a main oil circuit and a plurality of branch oil circuits, wherein an oil tank, a heating pump, a temperature sensor, an oil supply gear pump, a main oil circuit overflow valve and a cooling circulation device are located on the main oil circuit; the oil tank is loaded with a heating pump and a temperature sensor, and the oil supply gear pump provides power for the oil inlet of the lubricating oil system; the cooling circulation device is located upstream of the oil tank and downstream of the branch oil circuit return oil gear pump; and the main oil circuit overflow valve is located downstream of the oil supply gear pump. The present invention can control the temperature of the lubricating oil in the system by installing a heating pump and a temperature sensor and a cooling circulation device on the oil tank, and can monitor the temperature of the lubricating oil flowing into and out of the engine bearing in real time in conjunction with the temperature sensor on the lubricating oil pipeline.

Description

Technical Field

[0001] The invention belongs to the field of mechanical testing, and in particular relates to a bearing lubricating oil thermal cycle measurement system for an engine test bench. Background Art

[0002] The aircraft engine system is developing towards high speed and high load, and higher requirements are also put forward for the dynamic and thermal performance of the supporting components. As an important supporting and transmission component in the rotor system of an aircraft engine, the bearing has more complex dynamic and temperature characteristics than other position components, and is even nonlinear in many cases. In-depth research on the nonlinear temperature characteristics of bearings is of great significance to clarify the mutual influence mechanism of dynamic parameters and thermal parameters. Bearings work in liquid media lubricated by oil and grease. These lubricating oils circulate inside the engine through the oil inlet and outlet pipelines. The pre-temperature of the bearing can be changed by controlling the temperature of the lubricating oil, and the contact degree between the bearing and the lubricating oil can be changed by controlling the pressure and flow, which indirectly changes the bearing temperature. At the same time, the friction heat generated during the operation of the bearing can increase the bearing temperature. By controlling the operating speed of the bearing, the lubricating oil temperature can be changed, thereby realizing the study of the mutual influence of the bearing dynamic parameters and thermal parameters.

[0003] At present, the oil circulation measurement system of the engine is mostly concerned with the flow measurement in the pipeline, so as to study the selection of oil pipe diameter and oil tank size, etc. The specific plan is to build the oil circulation system of the engine, set up flow sensors and other devices on the oil pipeline of the measurement section to measure the flow in it, and take the temperature change as a problem to be overcome in the measurement. The impact of temperature changes in the oil system on the dynamic behavior of the bearing is not considered. It only measures the flow of the oil system and ignores the temperature parameters of the oil circuit. Summary of the invention

[0004] In order to solve the above technical problems, the present invention further provides an engine test bench bearing lubricating oil thermal cycle measurement system.

[0005] The invention relates to an engine test bench bearing lubricating oil thermal cycle measurement system, comprising a main oil circuit and a plurality of branch oil circuits, wherein an oil tank (1), a heating pump (2), a temperature sensor (3), an oil supply gear pump (4), a main oil circuit overflow valve (5) and a cooling circulation device (34) are located on the main oil circuit; the oil tank (1) is loaded with a heating pump (2) and a temperature sensor (3); the oil supply gear pump (4) provides power for the oil inlet of the lubricating oil system; the cooling circulation device (34) is located upstream of the oil tank (1) and downstream of a branch oil circuit return oil gear pump; the main oil circuit overflow valve (5) is located downstream of the oil supply gear pump (4); and the branch oil circuit is respectively provided with a branch oil circuit pressure regulating valve, a branch oil circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor, a temperature sensor and a branch oil circuit return oil gear pump.

[0006] The oil distribution circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and a return oil gear pump.

[0007] The oil-circuit pressure regulating valve comprises a first oil-circuit pressure regulating valve (6), a second oil-circuit pressure regulating valve (7) and a third oil-circuit pressure regulating valve (8).

[0008] The throttle valves include a first throttle valve (9), a second throttle valve (10), a third throttle valve (11), a fourth throttle valve (28), a fifth throttle valve (29) and a sixth throttle valve (30).

[0009] The flow sensor comprises a first flow sensor (12), a second flow sensor (13) and a third flow sensor (14).

[0010] The pressure sensor comprises a first pressure sensor (15), a second pressure sensor (16), a third pressure sensor (17), a fourth pressure sensor (25), a fifth pressure sensor (26) and a sixth pressure sensor (27).

[0011] The temperature sensors include a first temperature sensor (18), a second temperature sensor (19), a third temperature sensor (20), a fourth temperature sensor (22), a fifth temperature sensor (23) and a sixth temperature sensor (24).

[0012] The oil return gear pump comprises a first oil return gear pump (31), a second oil return gear pump (32), a third oil return gear pump (33) and a cooling circulation device (34).

[0013] The oil passage includes three oil passages, namely the front oil passage a, the middle oil passage b and the rear oil passage c.

[0014] Beneficial Effects

[0015] The present invention constructs a bearing lubricating oil thermal cycle measurement system for a turbofan engine test bench, which can control the temperature, flow rate and pressure of the lubricating oil pipeline of the oil inlet section, and monitor the temperature, pressure, flow rate of the lubricating oil pipeline of the oil inlet section, and the temperature and pressure of the lubricating oil pipeline of the oil return section in real time. With this system, the nonlinear temperature characteristics of the bearing can be studied, and the mutual influence between the thermal parameters and dynamic parameters of the bearing can be analyzed. When the bearing speed is kept constant, the lubricating oil temperature flowing into the bearing can be changed by changing the temperature of the oil inlet tank to give the main oil circuit a pre-temperature, so as to analyze the influence of the pre-temperature change on the dynamic behavior of the bearing; when the bearing speed is kept constant, the contact area and contact degree between the bearing and the lubricating oil can also be changed by changing the flow rate and pressure of the lubricating oil pipeline of the oil inlet section, so as to change the temperature of the bearing and analyze its dynamic influence; when the temperature, flow rate and pressure of the oil inlet circuit are kept constant, the dynamic parameters such as the bearing speed are changed and the temperature and pressure of the lubricating oil pipeline of the oil outlet section are monitored, so as to analyze the influence of the bearing dynamic parameters on its temperature characteristics.

[0016] The present invention adopts a series of control and monitoring means for the oil circuit temperature parameters. In terms of control, a heating pump on the oil tank adjusts the temperature, a pressure regulating valve on the oil inlet section lubricating oil pipeline adjusts the pressure, and a throttle valve adjusts the flow rate. In terms of monitoring, an oil tank temperature sensor, an oil inlet section lubricating oil pipeline temperature sensor and a pressure gauge, and a temperature sensor and a pressure sensor on the oil return section lubricating oil pipeline monitor the changes in oil circuit temperature and pressure, ultimately achieving the purpose of analyzing the nonlinear temperature characteristics of the bearing and explaining the mechanism of mutual influence between dynamic parameters and thermal parameters.

[0017] The present invention can control the temperature of the lubricating oil in the system by installing a heating pump, a temperature sensor, and a cooling circulation device on the oil tank, and can monitor the temperature of the lubricating oil flowing into and out of the engine bearing in real time by cooperating with the temperature sensor on the lubricating oil pipeline; at the same time, a main oil circuit overflow valve and a branch oil circuit pressure regulating valve are installed on the oil inlet section lubricating oil pipeline, so that the pressure of the lubricating oil in the system can be controlled, and the lubricating oil pressure can be monitored in real time by cooperating with the pressure sensor on the lubricating oil pipeline; at the same time, a throttle valve and a flow sensor are used on the oil inlet section lubricating oil pipeline, so that the flow of lubricating oil flowing into the engine bearing can be controlled and monitored, and various types of bearings can be analyzed at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the engine test bench bearing oil thermal cycle measurement system of the present invention;

[0019] Figure 2 This is a model diagram of the intermediate bearing of the engine test bench of the present invention;

[0020] Figure 3 This is a diagram of the thermal nodes and control network model of the intermediate bearing of the present invention.

[0021] The figures are as follows:

[0022] Oil tank 1, heating pump 2, temperature sensor 3, oil supply gear pump 4, main oil circuit overflow valve 5, first oil circuit pressure regulating valve 6, second oil circuit pressure regulating valve 7, third oil circuit pressure regulating valve 8, first throttle valve 9, second throttle valve 10, third throttle valve 11, first flow sensor 12, second flow sensor 13, third flow sensor 14, first pressure sensor 15, second pressure sensor 16, third pressure sensor 17, first temperature sensor 18, second temperature sensor 19, third temperature sensor 20 , engine 21, front oil circuit a, middle oil circuit b, rear oil circuit c, fourth temperature sensor 22, fifth temperature sensor 23, sixth temperature sensor 24, fourth pressure sensor 25, fifth pressure sensor 26, sixth pressure sensor 27, fourth throttle valve 28, fifth throttle valve 29, sixth throttle valve 30, first oil return gear pump 31, second oil return gear pump 32, third oil return gear pump 33, cooling circulation device 34, high-pressure rotor corresponding shaft 1a, low-pressure rotor corresponding shaft 2b, intermediate bearing 3c. DETAILED DESCRIPTION

[0023] The following combination Figures 1 to 3 This embodiment will be described in detail.

[0024] The present invention relates to an engine test bench bearing lubricating oil thermal cycle measurement system, comprising a main oil circuit and a plurality of branch oil circuits, wherein an oil tank 1, a heating pump 2, a temperature sensor 3, an oil supply gear pump 4, a main oil circuit overflow valve 5 and a cooling circulation device 34 are located on the main oil circuit; the oil tank 1 is loaded with the heating pump 2 and the temperature sensor 3, and the oil supply gear pump 4 provides power for the oil inlet of the lubricating oil system; the cooling circulation device 34 is located upstream of the oil tank 1 and downstream of the branch oil circuit return oil gear pump; the main oil circuit overflow valve 5 is located downstream of the oil supply gear pump 4; and the branch oil circuit is respectively provided with a branch oil circuit pressure regulating valve, a branch oil circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor, a temperature sensor and a branch oil circuit return oil gear pump.

[0025] The oil distribution circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and a return oil gear pump.

[0026] The oil-circuit pressure regulating valve includes a first oil-circuit pressure regulating valve 6, a second oil-circuit pressure regulating valve 7 and a third oil-circuit pressure regulating valve 8. The first throttle valve 9, the second throttle valve 10, the third throttle valve 11, the fourth throttle valve 28, the fifth throttle valve 29 and the sixth throttle valve 30. The first flow sensor 12, the second flow sensor 13 and the third flow sensor 14. The first pressure sensor 15, the second pressure sensor 16, the third pressure sensor 17, the fourth pressure sensor 25, the fifth pressure sensor 26 and the sixth pressure sensor 27. The first temperature sensor 18, the second temperature sensor 19, the third temperature sensor 20, the fourth temperature sensor 22, the fifth temperature sensor 23 and the sixth temperature sensor 24. The return oil gear pump includes a first return oil gear pump 31, a second return oil gear pump 32, a third return oil gear pump 33 and a cooling circulation device 34.

[0027] The oil circuit includes three oil circuits, namely the front oil circuit a, the middle oil circuit b and the rear oil circuit c. The types and methods of sensors and valves connected on the three oil circuits can be completely consistent. The difference is that the oil circuit a corresponds to three types of bearings, namely the ball bearings installed on the low-pressure compressor and the casing, the roller bearings installed on the low-pressure compressor and the casing, and the ball bearings installed on the high-pressure compressor and the casing. The oil circuit b corresponds to two types of bearings, namely the intermediate roller bearings installed between the high and low pressure rotors and the roller bearings installed on the high-pressure turbine and the casing. The oil circuit c corresponds to the roller bearings installed on the low-pressure turbine and the casing.

[0028] Example 1

[0029] The main oil circuit and the front oil circuit a are described in detail below. The installation method and working principle of the middle oil circuit b and the rear oil circuit c are the same as those of the front oil circuit a, and will not be repeated here.

[0030] In the main oil circuit, a heating pump 2 and a temperature sensor 3 are installed on the oil tank 1, which can heat the lubricating oil in the oil tank and monitor the temperature in real time. Through the heating pump, a pre-temperature can be provided for the entire lubricating oil circulation system, so that different temperatures are displayed on the temperature sensor 18, thereby achieving the purpose of analyzing the dynamic behavior of the engine bearing under different temperature parameters.

[0031] The oil supply gear pump 4 provides power for the oil inlet of the lubricating oil system. The cooling circulation device 34 is located upstream of the oil tank 1 and downstream of the oil return gear pump 31. The cooling temperature and cooling return temperature can be set to accurately control the cooling of the lubricating oil returning to the oil tank. The cooling method adopted is air cooling, and it can also be selected according to the required cooling efficiency.

[0032] The main oil circuit overflow valve 5 is located downstream of the oil supply gear pump 4 and is used in conjunction with the third pressure regulating valve 8 on the oil distribution circuit to maintain a constant pressure in the entire circulation system. When the system is overloaded, it can also allow excess lubricating oil in the system to overflow back to the oil tank.

[0033] On the oil inlet section lubricating oil pipeline, the third pressure regulating valve 8 and the first throttle valve 9 can change the pressure and flow of the lubricating oil on the oil inlet section, thereby changing the contact degree between the engine bearing and the lubricating oil, and indirectly changing the bearing temperature. According to the heat transfer relationship between the lubricating oil and the bearing, the influence of thermal parameters on the dynamic behavior is further analyzed. The first flow sensor 12 is located downstream of the first throttle valve 9 and upstream of the first pressure sensor 15, realizing real-time monitoring of the lubricating oil flow in the oil inlet section. The first pressure sensor 15 is located upstream of the first temperature sensor 18, realizing real-time monitoring of the lubricating oil pressure in the oil inlet section. The first temperature sensor 18 is located upstream of the engine 21, realizing real-time monitoring of the lubricating oil temperature flowing into the engine bearing.

[0034] On the oil return section lubricating oil pipeline, the fourth temperature sensor 22 is located downstream of the engine 21 to realize real-time monitoring of the lubricating oil temperature flowing out of the engine bearing. The pressure sensor 25 is located downstream of the fourth temperature sensor 22 to realize real-time monitoring of the lubricating oil pressure in the oil return section. The fourth throttle valve 28 is located downstream of the fourth pressure sensor 25, which can change the flow rate of the lubricating oil in the oil return section, thereby controlling the flow time of the lubricating oil. The first oil return gear pump 31 is located downstream of the fourth throttle valve 28, responsible for returning the lubricating oil to the oil tank 1, realizing the circulation of the entire lubricating oil system. The oil return gear pump 31 contains a valve to control the two modes of gravity oil return and power oil return applied by the pump. When gravity oil return is adopted, the oil return process no longer includes the role of external influences, and the change of lubricating oil temperature is only affected by the dynamic behavior of the engine bearing. With the fourth temperature sensor 22 and the fourth pressure sensor 25, the influence of the engine bearing on the lubricating oil temperature under different dynamic behaviors can be studied, thereby studying the influence of the bearing dynamic parameters on the thermal parameters.

[0035] The engine test bench bearing lubricating oil thermal cycle measurement system of the present invention is based on the conventional engine lubricating oil cycle measurement system, and a heating pump 2 and a temperature sensor 3 are added to the oil tank 1 to apply pre-temperature to the lubricating oil of the lubricating oil system, which can change the lubricating oil temperature in the engine bearing; a pressure sensor is added to the lubricating oil pipeline of the oil inlet section, and the temperature sensor is used in conjunction with the oil distribution pressure regulating valve and the heating pump to realize the control and monitoring of the temperature and pressure of the lubricating oil flowing into the engine bearing, so as to study the influence of thermal parameters on the bearing dynamic behavior; a temperature sensor and a pressure sensor are added to the lubricating oil pipeline of the oil return section to realize the monitoring of the temperature and pressure of the lubricating oil flowing out of the engine bearing, so as to study the influence of bearing dynamic parameters on temperature characteristics; the bearing part of the engine 21 includes six types of bearings installed in different positions and having different functions, namely, the intermediate roller bearing between the high and low pressure rotors, the low-pressure ball bearing and the low-pressure roller bearing of the compressor part, the high-pressure ball bearing, and the low-pressure roller bearing and the high-pressure roller bearing of the turbine part. These six types of bearings are distributed in three oil distribution paths, a, b, and c. By controlling and monitoring the oil inlet and return on the oil distribution paths, the temperature characteristics of the six types of bearings can be studied simultaneously.

[0036] The installation order of the temperature sensor and the pressure sensor on the oil inlet section lubricating oil pipeline and the oil return section lubricating oil pipeline can be interchanged, and there is no impact on the measurement system. That is, on the oil inlet section lubricating oil pipeline, the current temperature sensor is located upstream of the engine 21 and downstream of the pressure sensor, which can be changed to the pressure sensor being located upstream of the engine 21 and downstream of the temperature sensor; at the same time, on the oil return section lubricating oil pipeline, the current temperature sensor is located downstream of the engine 21 and upstream of the pressure sensor, which can be changed to the pressure sensor being located downstream of the engine 21 and upstream of the temperature sensor.

[0037] Example 2

[0038] The control mode of the lubricating oil heat circulation system of the present invention is explained below by taking the intermediate bearing on the middle oil circuit b as an example.

[0039] Figure 2 In the figure, the right side is an enlarged intermediate bearing, the arrow indicates the flow direction of the lubricating oil in the bearing, the inflow indicator is next to T0, and the outflow indicator is next to T1. Among them: T0 is the measurable inflow lubricating oil temperature; T1 is the temperature of the high-pressure rotor contacting the outer ring of the shaft; T2 is the temperature of the outer ring of the bearing; T3 is the temperature of the bearing roller; T4 is the temperature of the inner ring of the bearing; T5 is the temperature of the low-pressure rotor contacting the inner ring of the shaft; T6 is the ambient temperature (the bearing is a hollow shaft); T7 is the measurable outflow lubricating oil temperature.

[0040] Figure 3 is the thermal node and control network model of the intermediate bearing, T0 to T7 and Figure 235, 40, 41, 42, 43 represent the convection thermal resistance between the corresponding two components (35 is the lubricating oil and the high-pressure rotor, 40 is the low-pressure rotor and the environment, 41 is the bearing outer ring and the lubricating oil, 42 is the bearing roller and the lubricating oil, 43 is the bearing inner ring and the lubricating oil); 36, 37, 38, 39 are the contact thermal resistances between the corresponding two components (36 is the high-pressure rotor and the bearing outer ring, 37 is the bearing outer ring and the bearing roller, 38 is the bearing roller and the bearing inner ring, 39 is the bearing inner ring and the low-pressure rotor); A is the main oil circuit temperature, B is the branch oil circuit pressure, C is the branch oil circuit flow, D is the high-pressure rotor speed, and E is the low-pressure rotor speed.

[0041] For each thermal node, the control equation of heat transfer can be obtained in accordance with the thermal balance method, among which, controlling the main oil circuit temperature, branch oil circuit pressure, and branch oil circuit flow rate can control the change of T0, thereby analyzing the changes in T7 and dynamic response; keeping the main oil circuit temperature, branch oil circuit pressure, and branch oil circuit flow rate unchanged, controlling the high-pressure rotor speed and the low-pressure rotor speed can control the change of T7, thereby reversely analyzing the change of T0.

[0042] Among the three oil passages, the front oil passage a, the middle oil passage b, and the rear oil passage c correspond to the six bearings of the engine 21, respectively. The front oil passage a includes bearings No. 1, No. 2, and No. 3, the middle oil passage b includes bearings No. 4 and No. 5, and the rear oil passage c includes bearing No. 6, wherein bearing No. 1 is a ball bearing installed on the low-pressure compressor and the casing, bearing No. 2 is a roller bearing installed on the low-pressure compressor and the casing, bearing No. 3 is a ball bearing installed on the high-pressure compressor and the casing, bearing No. 4 is an intermediate roller bearing installed between the high-pressure and low-pressure rotors, bearing No. 5 is a roller bearing installed on the high-pressure turbine and the casing, and bearing No. 6 is a roller bearing installed on the low-pressure turbine and the casing. The thermal node and control network model of the intermediate bearing, used together with the measurement system, can effectively control and analyze the nonlinear temperature characteristics of the intermediate bearing.

[0043] The above contents are only preferred embodiments of the present invention and are not intended to limit the implementation scheme of the present invention. A person skilled in the art can easily make corresponding changes or modifications based on the main concept and spirit of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope required by the claims.

Claims

1. An engine test bench bearing oil thermal cycle measurement system, characterized in that: The invention comprises a main oil circuit and a plurality of branch oil circuits, wherein an oil tank (1), a heating pump (2), a temperature sensor (3), an oil supply gear pump (4), a main oil circuit overflow valve (5) and a cooling circulation device (34) are located on the main oil circuit; the oil tank (1) is loaded with a heating pump (2) and a temperature sensor (3), and the oil supply gear pump (4) provides power for the oil inlet of the lubricating oil system; the cooling circulation device (34) is located upstream of the oil tank (1) and downstream of the branch oil circuit return gear pump; the main oil circuit overflow valve (5) is located downstream of the oil supply gear pump (4); the branch oil circuit comprises three branch oil circuits, namely a front oil circuit a, a middle oil circuit b and a rear oil circuit c, and the branch oil circuits are respectively provided with branch oil circuit pressure regulating valves, throttle valves, flow sensors, pressure sensors, temperature sensors and branch oil circuit return gear pumps; The bearing part of the engine (21) includes six bearings installed at different positions and having different functions; the six bearings are distributed in three oil distribution paths a, b, and c, and the temperature characteristics of the six bearings can be studied simultaneously by controlling and monitoring the oil inlet and oil return on the oil distribution paths; the three oil distribution paths, the front oil path a, the middle oil path b, and the rear oil path c, correspond to the six bearings of the engine (21), respectively, and the front oil path a includes bearings No. 1, No. 2, and No. 3, the middle oil path b includes bearings No. 4 and No. 5, and the rear oil path c includes bearing No. 6, wherein bearing No. 1 is a ball bearing installed on the low-pressure compressor and the casing, bearing No. 2 is a roller bearing installed on the low-pressure compressor and the casing, bearing No. 3 is a ball bearing installed on the high-pressure compressor and the casing, bearing No. 4 is an intermediate roller bearing installed between the high-pressure and low-pressure rotors, bearing No. 5 is a roller bearing installed on the high-pressure turbine and the casing, and bearing No. 6 is a roller bearing installed on the low-pressure turbine and the casing; For each thermal node, the control equation of heat transfer can be obtained in accordance with the thermal balance method, among which, controlling the main oil circuit temperature, branch oil circuit pressure, and branch oil circuit flow rate can control the change of the incoming lubricating oil temperature (T0), thereby analyzing the change of the outgoing lubricating oil temperature (T7) and the dynamic response; keeping the main oil circuit temperature, branch oil circuit pressure, and branch oil circuit flow rate unchanged, controlling the high-pressure rotor speed and the low-pressure rotor speed can control the change of the outgoing lubricating oil temperature (T7), thereby reversely analyzing the change of the incoming lubricating oil temperature (T0); the thermal node and control network model of the intermediate bearing, used together with the measurement system, can effectively control and analyze the nonlinear temperature characteristics of the intermediate bearing.

2. The engine test bench bearing oil thermal cycle measurement system according to claim 1, characterized in that: The oil distribution circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and a return oil gear pump.

3. The engine test bench bearing oil thermal cycle measurement system according to claim 2, characterized in that: The oil branch circuit includes three oil branch circuits, namely the front oil circuit a, the middle oil circuit b and the rear oil circuit c. The oil branch circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil branch circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The oil branch circuit pressure regulating valve includes a first oil branch circuit pressure regulating valve (6) on the front oil circuit a, a second oil branch circuit pressure regulating valve (7) on the middle oil circuit b and a third oil branch circuit pressure regulating valve (8) on the rear oil circuit c.

4. The engine test bench bearing oil thermal cycle measurement system according to claim 2, characterized in that: The oil distribution circuit includes three oil distribution circuits, namely, a front oil distribution circuit a, a middle oil distribution circuit b and a rear oil distribution circuit c. The oil distribution circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The throttle valve on the oil inlet section lubricating oil pipeline includes a first throttle valve (9) on the front oil distribution circuit a, a second throttle valve (10) on the middle oil distribution circuit b and a third throttle valve (11) on the rear oil distribution circuit c. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and an oil return gear pump. The throttle valve on the return section lubricating oil pipeline includes a fourth throttle valve (28) on the front oil distribution circuit a, a fifth throttle valve (29) on the middle oil distribution circuit b and a sixth throttle valve (30) on the rear oil distribution circuit c.

5. The engine test bench bearing oil thermal cycle measurement system according to claim 2, characterized in that: The oil distribution circuit comprises three oil distribution circuits, namely a front oil distribution circuit a, a middle oil distribution circuit b and a rear oil distribution circuit c. The oil distribution circuit comprises an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The flow sensors on the oil inlet section lubricating oil pipeline comprise a first flow sensor (12) on the front oil distribution circuit a, a second flow sensor (13) on the middle oil distribution circuit b and a third flow sensor (14) on the rear oil distribution circuit c.

6. The engine test bench bearing oil thermal cycle measurement system according to claim 2, characterized in that: The oil distribution circuit includes three oil distribution circuits, namely the front oil distribution circuit a, the middle oil distribution circuit b and the rear oil distribution circuit c. The oil distribution circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The pressure sensor on the oil inlet section lubricating oil pipeline includes a first pressure sensor (15) on the front oil distribution circuit a, a second pressure sensor (16) on the middle oil distribution circuit b and a third pressure sensor (17) on the rear oil distribution circuit c. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and an oil return gear pump. The pressure sensor on the return section lubricating oil pipeline includes a fourth pressure sensor (25) on the front oil distribution circuit a, a fifth pressure sensor (26) on the middle oil distribution circuit b and a sixth pressure sensor (27) on the rear oil distribution circuit c.

7. The engine test bench bearing lubricating oil thermal cycle measurement system according to claim 2, characterized in that: The oil distribution circuit includes three oil distribution circuits, namely the front oil distribution circuit a, the middle oil distribution circuit b and the rear oil distribution circuit c. The oil distribution circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil inlet section lubricating oil pipeline is sequentially installed with an oil distribution circuit pressure regulating valve, a throttle valve, a flow sensor, a pressure sensor and a temperature sensor. The temperature sensor on the oil inlet section lubricating oil pipeline includes a first temperature sensor (18) on the front oil distribution circuit a, a second temperature sensor (19) on the middle oil distribution circuit b and a third temperature sensor (20) on the rear oil distribution circuit c. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and an oil return gear pump. The temperature sensor on the return section lubricating oil pipeline includes a fourth temperature sensor (22) on the front oil distribution circuit a, a fifth temperature sensor (23) on the middle oil distribution circuit b and a sixth temperature sensor (24) on the rear oil distribution circuit c.

8. The engine test bench bearing lubricating oil thermal cycle measurement system according to claim 2, characterized in that: The oil branch circuit includes three oil branch circuits, namely the front oil circuit a, the middle oil circuit b and the rear oil circuit c. The oil branch circuit includes an oil inlet section lubricating oil pipeline and an oil return section lubricating oil pipeline. The oil return section lubricating oil pipeline is sequentially installed with a temperature sensor, a pressure sensor, a throttle valve and an oil return gear pump. The oil return gear pump includes a first oil return gear pump (31) on the front oil circuit a, a second oil return gear pump (32) on the middle oil circuit b, and a third oil return gear pump (33) on the rear oil circuit c.

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