CN-122016226-A - Rotary shaft balance structure based on topological optimization

CN122016226ACN 122016226 ACN122016226 ACN 122016226ACN-122016226-A

Abstract

The invention provides a rotary shaft balance structure based on topological optimization, which comprises an inner ring, measuring beams and an outer ring, wherein key holes are formed in the inner ring, the inner ring and the outer ring are connected through a plurality of groups of measuring beams, strain gauges are attached to the measuring beams and can sense deformation of the measuring beams to convert six-component aerodynamic force of a measured object into electric signals to be output, the outer ring is of a hollowed-out structure formed by beams with irregular surfaces and holes, and a plurality of mounting holes used for being connected with a measured device are circumferentially distributed in the outer ring. By adopting the topological optimization design to the outer ring of the rotary shaft balance, a hollow structure formed by beams and holes with irregular surfaces is formed, so that the mass of the outer ring is greatly reduced while the design rigidity of the rotary shaft balance is ensured, and the problem that the rigidity of the measuring beam is hardened due to centrifugal force when the rotary shaft balance rotates at a high speed, so that the resistance measurement error is larger is solved.

Inventors

MU XIANGYANG
YAN WANFANG
NI WENBIN
HU QIANG
WEI WEI
WEI ZHONGWU
DONG JINGANG
ZHANG JIANG

Assignees

中国航天空气动力技术研究院

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (8)

1. A rotary shaft balance structure based on topological optimization is characterized by comprising an inner ring, measuring beams and an outer ring, wherein key holes are formed in the inner ring, the inner ring is connected with the outer ring through a plurality of groups of measuring beams, strain gauges are attached to the measuring beams and can sense deformation of the measuring beams to convert six-component aerodynamic force of a measured object into electric signals to be output, the outer ring is of a hollowed-out structure formed by beams with irregular surfaces and holes, and a plurality of mounting holes used for being connected with a measured device are circumferentially distributed in the outer ring.
2. The rotary shaft balance structure based on topological optimization according to claim 1, wherein the outer ring comprises a plurality of supporting units uniformly arranged along the circumferential direction of the inner ring, the mounting holes are formed between the adjacent supporting units, the supporting units comprise connecting parts, an outer optimizing beam and an inner optimizing beam are symmetrically arranged on two sides of the connecting parts respectively, and a supporting beam is connected between the outer optimizing beam and the inner optimizing beam which correspond to each other.
3. The topology optimization based rotating shaft balance structure of claim 1, wherein the outer ring monolithic structure is centrally symmetric about a balance axis.
4. The rotary balance structure based on topological optimization according to claim 2, wherein four groups of measuring beams are distributed along the circumference of the inner ring, each group comprises two measuring beams which are axially and alternately arranged along the inner ring, and a connecting part in the supporting unit is fixed between the two measuring beams.
5. The topology optimization based rotating shaft balance structure of claim 2, wherein the measuring beams are arranged in four groups along the circumference of the inner ring, each group comprising one measuring beam axially spaced along the inner ring.
6. The rotary shaft balance structure based on topological optimization according to claim 4 or 5, wherein the number of the mounting holes on the outer ring is four, each two adjacent groups of the supporting units are provided with mounting holes, and the mounting holes and the supporting units are alternately arranged to form a circular ring structure.
7. The topology-based rotary axle balance structure of claim 4 or 5, wherein the number of mounting holes on the outer ring is two.
8. The rotary balance structure based on topological optimization according to claim 4 or 5, wherein two sides of the connecting part are respectively provided with two outer optimizing beams and two inner optimizing beams.

Description

Rotary shaft balance structure based on topological optimization Technical Field The invention relates to the technical field of wind tunnel test measurement balances, in particular to a rotary shaft balance structure based on topological optimization. Background Propeller (fan) propulsion systems are commonly used in various aircraft designs, largely determining aircraft performance. In order to improve the performance of the propeller to the maximum extent, the aerodynamic force and the aeroacoustic characteristics of the propeller fan need to be accurately obtained, and meanwhile, the basis can be provided for reasonable installation and layout of the propeller fan on an aircraft. The classical propeller aerodynamic force measuring method is to directly install a propeller model with power on an external strain balance, however, the method cannot distinguish mutual interference among the propeller, a supporting structure, a fuselage and a wing, and cannot obtain the real aerodynamic characteristics and the propulsion efficiency of the propeller. In order to overcome the problems of measurement limitation of an external propeller balance and low force measurement precision, a foreign research institution gradually develops a rotating shaft balance (Rotating Shaft Balance, RSB) technology, and the real pneumatic performance of the propeller can be directly obtained by directly installing the balance on a shaft between the propeller and a power system and only measuring the pneumatic load of the propeller. The measurement mode still has the problems that the balance and the screw propeller synchronously rotate at high speed during measurement, and because the outer ring of the balance is larger than the inner ring under the action of centrifugal force, under the condition, the measurement beam is under tension, the centrifugal force leads the rigidity of the measurement beam to become larger, the S-shaped deformation of the thrust measurement can be reduced, the measurement of the thrust component has the centrifugal force effect of about 3-10% F.S, and the measurement accuracy is influenced, so the problem of how to further improve the measurement accuracy of the rotating shaft balance on the aerodynamic performance of the screw propeller is still needed to be solved. Disclosure of Invention The invention aims to provide a rotary shaft balance structure based on topological optimization, which solves the technical problems of propeller (fan) working condition simulation, propeller fan aerodynamic performance measurement and the like under the condition of wind tunnel shrinkage test, and realizes accurate acquisition of the aerodynamic performance and propulsion efficiency of a rotary propeller fan. According to the purpose, the invention provides a rotary shaft balance structure based on topological optimization, which comprises an inner ring, measuring beams and an outer ring, wherein key holes are formed in the inner ring, the inner ring and the outer ring are connected through a plurality of groups of measuring beams, strain gauges are attached to the measuring beams and can sense deformation of the measuring beams to convert six-component aerodynamic force of a measured object into electric signals for output, the outer ring is of a hollowed-out structure formed by beams with irregular surfaces and holes, and a plurality of mounting holes used for being connected with a measured device are circumferentially distributed on the outer ring. Further, the outer ring includes along a plurality of supporting units of the circumference evenly arranged of inner ring, the mounting hole is seted up between adjacent supporting unit, the supporting unit includes connecting portion, the both sides of connecting portion symmetry respectively are equipped with outside optimization roof beam and inboard optimization roof beam, mutually corresponding outside optimization roof beam is connected with the supporting beam between the inboard optimization roof beam. Further, the outer ring integral structure is centrally symmetrical about the balance axis. Further, four groups of measuring beams are distributed along the circumference of the inner ring, each group comprises two measuring beams which are axially and alternately arranged along the inner ring, and a connecting part in the supporting unit is fixed between the two measuring beams. Further, four groups of measuring beams are distributed along the circumference of the inner ring, and each group comprises one measuring beam which is axially and alternately distributed along the inner ring. Further, the number of the mounting holes on the outer ring is four, mounting holes are formed between every two adjacent groups of the supporting units, and the mounting holes and the supporting units are alternately arranged to form a circular ring structure. Further, the number of the mounting holes on the outer ring is two. Further, two sets of integrally formed supporting uni