CN116181747A - Hydraulic thermal load spectrum determining method based on time domain - Google Patents
Hydraulic thermal load spectrum determining method based on time domain Download PDFInfo
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- CN116181747A CN116181747A CN202211531818.7A CN202211531818A CN116181747A CN 116181747 A CN116181747 A CN 116181747A CN 202211531818 A CN202211531818 A CN 202211531818A CN 116181747 A CN116181747 A CN 116181747A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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Abstract
The application provides a time-domain-based hydraulic thermal load spectrum determination method, which comprises the following steps: analyzing the flow demand of the hydraulic system under a typical task section, and determining the thermal power of the hydraulic system, the thermal power of the actuating system and the environmental heat dissipation power; and determining the heat capacity and heat storage power of hydraulic oil in the hydraulic system, determining peak heat power according to the heat power of the hydraulic system, the heat power of the actuating system and the heat dissipation power of the environment, and removing the heat capacity and heat storage power of the hydraulic oil from the peak heat power to obtain a hydraulic heat load spectrum. According to the hydraulic heat load spectrum determining method for the time domain, the peak heat dissipation requirement of the hydraulic system can be reduced by removing part of hydraulic oil heat capacity and heat storage power from the peak heat dissipation requirement, the weight of the heat dissipation accessory structure is reduced, and the heat dissipation accessory of the hydraulic system has certain weight reduction benefits.
Description
Technical Field
The application belongs to the technical field of aircraft hydraulic pipelines, and particularly relates to a hydraulic thermal load spectrum determining method based on a time domain.
Background
According to the corresponding requirements of the hydraulic system of the airplane, the temperature of the hydraulic oil is controlled within a certain range, so that the degradation of the oil quality and the accelerated aging of the sealing elements of the system caused by the overhigh temperature of the hydraulic oil are avoided. Therefore, when designing a hydraulic system, a heat dissipation design is often performed based on the maximum thermal power of the hydraulic system, but the heat dissipation design results in high redundancy of the thermal design and heavy structure.
Disclosure of Invention
It is an object of the present application to provide a time domain based hydraulic thermal load spectrum determination method to solve or mitigate at least one problem in the background art.
The technical scheme of the application is as follows: a time domain based hydraulic thermal load spectrum determination method, the method comprising:
analyzing the flow demand of the hydraulic system under a typical task section, and determining the thermal power of the hydraulic system, the thermal power of the actuating system and the environmental heat dissipation power;
and determining the heat capacity and heat storage power of hydraulic oil in the hydraulic system, determining peak heat power according to the heat power of the hydraulic system, the heat power of the actuating system and the heat dissipation power of the environment, and removing the heat capacity and heat storage power of the hydraulic oil from the peak heat power to obtain a hydraulic heat load spectrum.
Further, the determining process of the thermal power of the hydraulic system includes:
determining the thermal power of the hydraulic system under zero flow and maximum flow at different rotation speeds of the hydraulic pump;
obtaining the thermal power of the hydraulic system under the actual output flow of the hydraulic pump by an interpolation method according to the thermal power of the hydraulic system under the zero flow and the maximum flow, wherein the calculation formula of the thermal power of the hydraulic system is as follows:
W maximum flow rate of pump ＝(P-P 0 )·Q Hydraulic pump ·η Hydraulic pump
Wherein P is full flow pressure supply pressure;
P 0 inlet pressure for the hydraulic pump;
Q hydraulic pump Maximum output flow of the hydraulic pump at different rotating speeds;
η hydraulic pump Is the ratio of the thermal power to the output power at the maximum output flow rate of the hydraulic pump.
Further, the determining process of the thermal power of the actuating system includes:
determining an actuation efficiency of the actuation system;
and calculating the thermal power of the actuating system according to the actuating efficiency, wherein the calculation formula of the thermal power of the actuating system is as follows:
W general actions ＝P·Q General actions ·(1-η General actions )
Wherein: p is the full flow pressure supply pressure;
Q general actions Is the actual output flow;
η general actions Is a common working efficiency.
Further, the determining process of the environmental heat dissipation power includes:
calculating the environmental heat dissipation power according to solid heat conduction and natural convection heat exchange with ambient air, wherein the calculation formula of the environmental heat exchange power is as follows:
W＝K·A·ΔT
wherein: k is a heat exchange coefficient;
a is the heat exchange area;
delta T is the difference between the hydraulic oil and the ambient temperature.
Further, the peak thermal power is equal to the sum of the hydraulic system thermal power, the actuation system thermal power, and the ambient heat dissipation power.
According to the hydraulic heat load spectrum determining method for the time domain, the peak heat dissipation requirement of the hydraulic system can be reduced by removing part of hydraulic oil heat capacity and heat storage power from the peak heat dissipation requirement, the weight of the heat dissipation accessory structure is reduced, and the heat dissipation accessory of the hydraulic system has certain weight reduction benefits.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following description will briefly refer to the accompanying drawings. It will be apparent that the figures described below are only some embodiments of the present application.
Fig. 1 is a flow chart of a hydraulic load spectrum determination method of the present application.
FIG. 2 is a schematic diagram illustrating heat dissipation requirements according to an embodiment of the present application.
FIG. 3 is a schematic diagram of temperature control in an embodiment of the present application.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.
In order to solve the problems in the background art, the hydraulic pump thermal power spectrum, the internal leakage of the hydraulic system, the efficiency of the actuating system and other factors are comprehensively considered in the application, the environmental heat dissipation and the hydraulic oil heat capacity and heat storage are fully utilized, the hydraulic thermal load spectrum calculation method for reducing the peak heat dissipation requirement of the hydraulic system is realized, and finally the weight reduction of the heat dissipation accessory of the hydraulic system is realized.
As shown in fig. 1, the present application proposes a hydraulic thermal load spectrum calculation method, which includes:
s1, analyzing flow demand of a hydraulic system under a typical section based on time domain task demands, and performing thermal power calculation of the hydraulic system, thermal power calculation of an actuating system and environmental heat dissipation calculation, wherein the specific process comprises the following steps:
1) Based on the hydraulic pump under different rotating speeds, determining the thermal power of the hydraulic system under zero flow and maximum flow, and carrying out interpolation calculation according to the actual output flow of the hydraulic pump to obtain the thermal power of the hydraulic system, wherein the calculation formula of the thermal power of the hydraulic system is as follows:
W maximum flow rate of pump ＝(P-P 0 )·Q Hydraulic pump ·η Hydraulic pump
Wherein P is full flow pressure supply pressure;
P 0 inlet pressure for the hydraulic pump;
Q hydraulic pump Maximum output flow of the hydraulic pump at different rotating speeds;
η hydraulic pump Is the ratio of the thermal power to the output power at the maximum output flow rate of the hydraulic pump.
2) And carrying out thermal power calculation of the actuating system based on the actuating efficiency, and fully considering the influence of internal leakage of the actuating system, wherein the calculation formula of the thermal power of the actuating system is as follows:
W general actions ＝P·Q General actions ·(1-η General dynamicActing as )
Wherein: p is the full flow pressure supply pressure;
Q general actions Is the actual output flow;
η general actions Is a common working efficiency.
3) According to solid heat conduction and natural convection heat exchange with ambient air, calculating environment heat dissipation, wherein the environment temperature is subjected to iterative analysis according to actual conditions, and a calculation formula of heat exchange power is as follows:
W＝K·A·ΔT
wherein: k is a heat exchange coefficient;
a is the heat exchange area;
delta T is the difference between the hydraulic oil and the ambient temperature.
S2, determining heat capacity and heat storage power of hydraulic oil in the hydraulic system, calculating to obtain peak heat power of the hydraulic system at the maximum stage according to the heat power of the hydraulic system, the heat power of the actuating system and the heat dissipation power of the environment, obtaining a hydraulic heat load spectrum from the heat capacity and heat storage power of the hydraulic oil in the peak heat power, and calculating temperature change of the hydraulic system through the hydraulic heat load spectrum, so that peak heat dissipation requirements of the hydraulic system are reduced.
As shown in fig. 2, in the heat dissipation requirement histogram of an embodiment of the present application, the abscissa from task 1 to task 18 is a task with different rotation speed conditions, and the ordinate is heat dissipation requirement power (kW), and it can be seen that in the stage from task 8 to task 9, the peak stage with the highest heat dissipation requirement is shown.
As shown in fig. 3, the temperature control curve of an embodiment of the present application is schematically shown, where the abscissa corresponds to tasks with different rotational speed conditions, and the ordinate is the hydraulic oil temperature (°c), and it can be seen that the hydraulic oil temperature also has a peak value around task 8-task 9.
According to the hydraulic heat load spectrum determining method for the time domain, the peak heat dissipation requirement of the hydraulic system can be reduced by removing part of hydraulic oil heat capacity and heat storage power from the peak heat dissipation requirement, the weight of the heat dissipation accessory structure is reduced, and the heat dissipation accessory of the hydraulic system has certain weight reduction benefits.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A time domain based hydraulic thermal load spectrum determination method, the method comprising:
analyzing the flow demand of the hydraulic system under a typical task section, and determining the thermal power of the hydraulic system, the thermal power of the actuating system and the environmental heat dissipation power;
and determining the heat capacity and heat storage power of hydraulic oil in the hydraulic system, determining peak heat power according to the heat power of the hydraulic system, the heat power of the actuating system and the heat dissipation power of the environment, and removing the heat capacity and heat storage power of the hydraulic oil from the peak heat power to obtain a hydraulic heat load spectrum.
2. The time-domain based hydraulic thermal load spectrum calculation method according to claim 1, wherein the hydraulic system thermal power determination process includes:
determining the thermal power of the hydraulic system under zero flow and maximum flow at different rotation speeds of the hydraulic pump;
obtaining the thermal power of the hydraulic system under the actual output flow of the hydraulic pump by an interpolation method according to the thermal power of the hydraulic system under the zero flow and the maximum flow, wherein the calculation formula of the thermal power of the hydraulic system is as follows:
W maximum flow rate of pump ＝(P-P 0 )·Q Hydraulic pump ·η Hydraulic pump
Wherein P is full flow pressure supply pressure;
P 0 inlet pressure for the hydraulic pump;
Q hydraulic pump Maximum output flow of the hydraulic pump at different rotating speeds;
η hydraulic pump Thermal power and output at maximum output flow rate of hydraulic pumpRatio of output power.
3. The time-domain based hydraulic thermal load spectrum calculation method according to claim 1, wherein the determining process of the thermal power of the actuation system includes:
determining an actuation efficiency of the actuation system;
and calculating the thermal power of the actuating system according to the actuating efficiency, wherein the calculation formula of the thermal power of the actuating system is as follows:
W general actions ＝P·Q General actions ·(1-η General actions )
Wherein: p is the full flow pressure supply pressure;
Q general actions Is the actual output flow;
η general actions Is a common working efficiency.
4. The time-domain based hydraulic thermal load spectrum calculation method of claim 1, wherein the determining of the ambient heat dissipation power comprises:
calculating the environmental heat dissipation power according to solid heat conduction and natural convection heat exchange with ambient air, wherein the calculation formula of the environmental heat exchange power is as follows:
W＝K·A·ΔT
wherein: k is a heat exchange coefficient;
a is the heat exchange area;
delta T is the difference between the hydraulic oil and the ambient temperature.
5. The time domain based hydraulic thermal load spectrum calculation method of claim 1, wherein the peak thermal power is equal to a sum of hydraulic system thermal power, actuation system thermal power, and ambient heat sink power.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211531818.7A CN116181747A (en) | 2022-12-01 | 2022-12-01 | Hydraulic thermal load spectrum determining method based on time domain |
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| CN202211531818.7A CN116181747A (en) | 2022-12-01 | 2022-12-01 | Hydraulic thermal load spectrum determining method based on time domain |
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