A method for estimating the weight of a hydraulic system

Abstract

The application belongs to the field of aircraft weight engineering, and particularly relates to a hydraulic system weight estimation method. yycp and the size information, the weight m of the hydraulic system is estimated through the following formula yygl The technical scheme can improve the estimation accuracy of the weight of the hydraulic system pipeline on the aircraft in the preliminary design stage, effectively solve the problem of large estimation error of the weight of the hydraulic system pipeline in the preliminary design stage, and realize accurate control of the weight of the hydraulic system.

Description

Technical Field

[0001] This application belongs to the field of aircraft weight engineering, and specifically relates to a method for estimating the weight of a hydraulic system. Background Technology

[0002] The hydraulic system is an important system in modern aircraft, and its weight is a significant component of the aircraft's weight. The number of hydraulic lines in the hydraulic system is in the hundreds. With the increase in hydraulic drive equipment on board, the length and weight of the hydraulic lines also increase, resulting in the hydraulic lines weighing hundreds of kilograms.

[0003] During aircraft design, the weight of the hydraulic system remains highly uncertain. This is primarily due to the large number of pipes involved, and the design of these pipes is inherently unpredictable. Factors such as system design, equipment location adjustments, and changes in routing all directly impact the hydraulic piping. Furthermore, these factors can only be determined shortly before the official drawings are released, shortly after the hydraulic system prototyping coordination is completed. In other words, the weight of the hydraulic piping can only be definitively determined before the official drawings are released. Additionally, hydraulic piping design exhibits a certain lag, typically 1-2 months behind structural design. Therefore, at any given stage, there is limited information available for hydraulic piping design and weight estimation, leading to significant errors in weight estimation before prototyping coordination is finalized, and consequently, a substantial error in the overall hydraulic system weight estimate.

[0004] The situation regarding weight control in modern aircraft is becoming increasingly severe, and the requirements for the accuracy of weight control are constantly increasing. This leads to a growing demand for accurate weight estimation of various systems, creating an urgent need for a method to improve the estimation of hydraulic system pipeline weight during the preliminary design phase. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a method for estimating the weight of a hydraulic system.

[0006] Obtain the total weight of all finished products and functional accessories of the hydraulic system;

[0007] Obtain the ground projection area s of the area occupied by the hydraulic pipelines of the hydraulic system;

[0008] Based on the total weight In addition to dimensional information, the weight of the hydraulic system is estimated using the following formula. :

[0009] in, This refers to the total weight of the finished hydraulic system.

[0010] This is an empirical coefficient.

[0011] Preferably, the method for calculating the floor area s includes: obtaining the length of the area occupied by the hydraulic pipeline. And width l, ground projection area s= ×l w .

[0012] Preferably, the empirical coefficient is used. The value ranges from 0.85 to 1.2.

[0013] Preferably, the length is measured. At that time, remove the length occupied by a single pipe; measure the width l w When this is done, the width occupied by a single pipe is removed.

[0014] Preferably, the finished products include: hydraulic oil tank, hydraulic pump, hydraulic oil filter, accumulator, solenoid valve, temperature sensor, pressure sensor, and rotary joint, but do not include actuating mechanisms.

[0015] The advantages of this application include: This technical solution can improve the estimation accuracy of the weight of hydraulic system pipelines on aircraft in the preliminary design stage, effectively solve the problem of large estimation error of hydraulic system pipeline weight in the preliminary design stage, and realize accurate control of the weight of hydraulic system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main areas of the hydraulic system equipment and pipelines of a certain type of aircraft. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, a method for estimating the weight of a hydraulic system is described.

[0019] Obtain the total weight of all finished products and functional accessories of the hydraulic system; specifically, based on the preliminary design of the entire hydraulic system, clarify the components of the hydraulic system and estimate the weight of the hydraulic system equipment. The finished hydraulic system products involved in this method include all finished products and functional accessories of the hydraulic system, mainly including: hydraulic oil tank, hydraulic pump, hydraulic oil filter, accumulator, solenoid valve, temperature sensor, pressure sensor, rotary joint, etc., but excluding actuation mechanisms, such as steering surface control servos and actuators.

[0020] Based on the location of the hydraulic system on the machine, the area 's' occupied by the hydraulic pipelines of the hydraulic system is obtained. The calculation method for the area 's' includes: obtaining the length of the area occupied by the hydraulic pipelines. and width l w The area occupied is s= ×l w Measure the length When this is done, the length occupied by a single pipe should be removed. That is, in the length direction, if there is only a single pipe in a certain segment of the system along the length direction, the length occupied by that single pipe should be removed; measure the width l. w When this is the case, the width occupied by a single pipe should be removed. That is, in the width direction, if there is only a single pipe in a certain segment of the system in the width direction, the length occupied by the single pipe should be removed.

[0021] Based on the total weight Based on the aforementioned dimensional information, the weight of the hydraulic system is estimated using the following formula. :

[0022] in, This refers to the total weight of the finished hydraulic system.

[0023] For empirical coefficients, empirical coefficients The value ranges from 0.85 to 1.2.

[0024] An embodiment of the above method:

[0025] In the early stages of the preliminary design phase of the development of a certain type of aircraft, only the preliminary system scheme design was completed, and the overall layout of the main finished products of the hydraulic system was completed. In the absence of available pipeline design information at this stage, the weight of the hydraulic system pipeline was estimated by using a method based on the weight of the finished products of the hydraulic system and the overall layout information.

[0026] Based on the preliminary hydraulic system design, the components of the finished hydraulic system were identified, and its weight was estimated. Analysis revealed that the hydraulic system includes a hydraulic tank, hydraulic pump, hydraulic oil filter, sensors, and other equipment. The total weight of the finished hydraulic system was calculated to be 417 kg.

[0027] Based on the preliminary overall layout of the finished product driven by the hydraulic system, determine the dimensions of the main area occupied by the hydraulic piping. The area occupied by the hydraulic piping is as follows: Figure 1 As shown, measurements indicate that the hydraulic pipeline occupies an area of ​​18m in length and 12m in width.

[0028] Based on the hydraulic pipeline weight estimation formula derived from information on the finished hydraulic system and its overall layout, the weight of the entire wiring harness is estimated. The estimation process is as follows:

[0029] =417 / ((0.60+(325-18×12) / 30 / 100)×1.01)-417

[0030] =232kg

[0031] The estimation error using the method presented in this paper is compared with that using the original collimator method. The results are as follows: the estimation error using the method presented in this paper is reduced by approximately 7% MAC compared to the original collimator method. A detailed comparison of the estimation results using the two methods is shown in Table 1.

[0032] Table 1 Comparison of Hydraulic Pipeline Weights

[0033] project weight (kg) error% This article's method 232 5.4 Original standard machine method 185.0 -11.4 Theoretical weight 220 ——

[0034] This application can significantly improve the accuracy of hydraulic system weight estimation in the early stages of the design phase. Comparative analysis shows that the hydraulic system weight estimated strictly according to the method described in this paper has significantly improved estimation accuracy compared to the estimation results using other methods (such as the standard machine method).

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for estimating the weight of a hydraulic system, characterized in that, Obtain the total weight of all finished products and functional accessories of the hydraulic system; Obtain the ground projection area s of the area occupied by the hydraulic pipelines of the hydraulic system; Based on the total weight In addition to dimensional information, the weight of the hydraulic system is estimated using the following formula. : in, This refers to the total weight of the finished hydraulic system. This is an empirical coefficient.

2. The hydraulic system weight estimation method as described in claim 1, characterized in that, The method for calculating the floor area s includes: obtaining the length l of the area occupied by the hydraulic pipeline. l and width l w Ground projection area s=l l ×l w .

3. The hydraulic system weight estimation method as described in claim 2, characterized in that, empirical coefficient The value ranges from 0.85 to 1.

2.

4. The hydraulic system weight estimation method as described in claim 2, characterized in that, Measure length At that time, remove the length occupied by a single pipe; measure the width l w When this is done, the width occupied by a single pipe is removed.

5. The hydraulic system weight estimation method as described in claim 1, characterized in that, The finished products include: hydraulic oil tanks, hydraulic pumps, hydraulic oil filters, accumulators, solenoid valves, temperature sensors, pressure sensors, and rotary joints, but do not include actuating mechanisms.

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