Determination method of engine mounted pull rod tolerance value

A determination method and engine technology, applied in the aviation field, can solve the problems of low processing cost of system parts, and achieve the effect of simple implementation, solving long-term problems and low cost

Active Publication Date: 2015-05-27
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the tolerance value obtained by the traditional method can meet the des

Method used

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  • Determination method of engine mounted pull rod tolerance value
  • Determination method of engine mounted pull rod tolerance value
  • Determination method of engine mounted pull rod tolerance value

Examples

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Embodiment

[0023] The following takes a certain type of aircraft engine installation system as an example, combining Table 1, Table 2, Table 3 and figure 2 , describe in detail the method of determining the tolerance value of the engine installation tie rod, the specific steps are as follows:

[0024] Step a: Divide all tolerances of the system into two categories: tolerance 1 that does not need optimization and tolerance 2 that requires optimization. Tolerance 1 that does not need optimization includes aircraft structure tolerances and engine tolerances; tolerance 2 that requires optimization includes tolerances for engine installation rods, In this example, it specifically refers to the four tie rod tolerances of the engine mounting system, including "AB rod 242.009 tolerance", "CD rod 89.66 tolerance", "T1F1 rod 266.133 tolerance", "T2F2 rod 311.075 tolerance", see Table 1.

[0025]

[0026]

[0027] Table 1

[0028] Step b: For a specific engine installation system, establish...

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Abstract

The invention belongs to the technical field of aviation, and relates to a determination method of an engine mounted pull rod tolerance value. The determination method of the engine mounted pull rod tolerance value comprises the following steps: dividing all tolerances of the system into two types of tolerances (1) (an airplane structure tolerance, and an engine tolerance) not required to be optimized and tolerances (2) (the engine mounted pull rod tolerance) required to be optimized; utilizing a tolerance analysis module (3) to calculate and obtain the maximum values of extreme values of all measurement targets (12); utilizing a cost calling module (7) to interpolate and obtain the total cost (11) of the system; calculating all possible combinations of the tolerances (2) (the engine mounted pull rod tolerance) required to be optimized on the premise of the situation that all the measurement targets (12) meet the design requirement that max(Li) is less than or equal to target i, and i is equal to 1, 2, to N; performing comparison and optimization to obtain the optimal tolerance combination enabling the total cost (11) to be minimum(cost).

Description

technical field [0001] The invention belongs to the field of aviation technology and relates to a method for determining the tolerance value of an engine installation tie rod. Background technique [0002] In order to meet the overall aerodynamic performance design index of the aircraft and realize the accurate positioning of the engine, it is necessary to specify the tolerance value of the engine installation tie rod. In the traditional method, the tolerance value is given arbitrarily without considering the processing cost. After using the tolerance analysis software to calculate the sensitivity of the tolerance in one direction, it first needs to coordinate with the manufacturing and processing capabilities of the factory. When improving the accuracy of a part Finally, the tolerance analysis software is used again to perform one-way calculation on the newly assigned tolerance to obtain a new sensitivity ranking, and the cycle is repeated until all measurement targets meet...

Claims

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Application Information

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IPC IPC(8): G01B21/00
CPCG01B21/00
Inventor 姚刚郭晰屈展
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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