Product Design Aspects for Design of Accurate Mass Properties Measurement System for Aerospace Vehicles

Gopinath, K.; Raghavendra, K; Behera, M.; Rao, E. V. Subba; Umakanth, M.; Gopinath, Shankar

doi:10.4028/www.scientific.net/amm.110-116.4712

Cited by 12 publications

(12 citation statements)

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“…These three load cells are placed on the same horizontal flat and angularly spaced by 120 • . This proposed method depends only on gravity force acting through the CG [1,4]. multi-point weighing method where three or more load cells need to be coupled, no related literatures report the measurement structure.…”

Section: Methods For Obtaining the Mass And Cg Of A Bodymentioning

confidence: 99%

“…The mass can be achieved by weighing machines, for instance, load cells. There are several methods to measure the CG, which can be roughly classified into three categories as follows: (1) static method such as multi-point weighing method or unbalance moment method [1,4,5], (2) dynamic method such as spin balance method or inverted torsion pendulum method [6][7][8][9], and (3) other methods such as the photogrammetric technique for determination of the CG for large scale objects [10].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the multi-point weighing method, which uses three or more load cells to support a test platform, has been widely used, and the reason is that this method can measure the mass and CG simultaneously. This method only depends on gravity force acting through the CG, and CG location is calculated by static equilibrium from the reaction forces on the load cells [1,4]. Due to these reasons, it is the most suitable method for some massive objects [4], and it is also the cheapest automatic system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Structure for Accurately Determining the Mass and Center of Gravity of Rigid Bodies

et al. 2019

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Measuring the mass and Center of Gravity (CG) of rigid bodies with a multi-point weighing method is widely used nowadays. Traditional methods usually include two parts with a certain location, i.e., a fixed platform and a mobile platform. In this paper, a novel structure is proposed to adjust the mobile platform for eliminating side forces which may load on the load cells. In addition, closed-form equations are formulated to evaluate the performance of the structure, and transformation matrices are used to estimate the characteristics of the structure. Simulation results demonstrate that repeatability of the proposed structure is higher than the traditional one and there are no side forces. Moreover, the measurement results show that the relative error of mass was within 0.05%, and the error of CG was within ±0.3 mm. The structure presented in this paper provides a foundation for practical applications.

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Section: Methods For Obtaining the Mass And Cg Of A Bodymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Structure for Accurately Determining the Mass and Center of Gravity of Rigid Bodies

et al. 2019

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“…Mass is a measure of the inertia of an object, and the centroid is the geometric point of equivalent mass distribution. The measurement deviation of the centroid affects the dynamics modeling of the aircraft and the accuracy of the scalar equation of kinematics, which ultimately affects the flight trajectory of the aircraft [ 1 , 2 , 3 , 4 , 5 ]. The MOI is the measurement of the rotational inertia of a rigid body and plays a key role in the attitude control of aircraft in the air [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

General Mass Property Measurement Equipment for Large-Sized Aircraft

Zhang

Tang

et al. 2022

Sensors

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The accurate measurement of aircraft mass properties, such as the mass, centroid, and moment of inertia (MOI), plays a key role in the precise control of aircraft. In order to obtain high-precision information on the parameters of the mass, centroid, and MOI of an aircraft using a single instrument, an integrated mass property measurement system was developed in this study by analyzing and comparing the latest technologies, especially the function-switching device, which switches the measurement states between the center of mass and the MOI. The purpose of mass property measurement was achieved through single clamping. In addition, the system has strong versatility and expansion and can be used with different tooling or adapter rings to measure the mass properties of aircraft with different shapes. In this paper, the main mechanical structure of the measurement system, the measurement method of relevant mass parameters, and the solution method of the transformation matrix are introduced, and the standard parts and the aircraft were verified experimentally. The test results showed that the mass measurement accuracy was 0.03%, the centroid measurement error was within ±0.2 mm, and the measurement accuracy of the MOI was within 0.2%, all of which meet the high-precision measurement requirements for the mass properties.

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“…Mass characteristic parameters refer to a series of mechanics characteristic parameters related to mass, including mass, barycenter and moment of inertia relative to a given coordinate system (Hou et al, 2009;Gobbi et al, 2014;Atchonouglo et al, 2008). For an aircraft, the barycenter is an important parameter that affects its motion and posture control (Gopinath et al, 2011;Zhang and Tang, 2011). To ensure that the position of barycenter can meet the design requirements, it is necessary to arrange the components reasonably during the development of aircraft.…”

Section: Introductionmentioning

confidence: 99%

Measurement method of aircraft barycenter based on multi posture

Chu

Huang

2020

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Purpose The measurement of aircraft barycenter is a verification of theoretical barycenter and is an important step of aircraft development. In the traditional measurement method of aircraft barycenter, the posture of the aircraft needs to be adjusted manually and is measured by optical instruments. The efficiency of posture adjustment depends on the proficiency of workers, and the accuracy of measurement is not high. In view of these problems of the current barycenter measurement method, this paper aims to propose an aircraft barycenter measurement method based on multi-posture. Design/methodology/approach In this method, the numerical control locator is used as a supporting part to fix and adjust the aircraft, and the calculation model of aircraft barycenter is established according to the principle of rigid body rotation and the principle of moment balance. Then, the influence of the main error sources on the measurement accuracy of aircraft barycenter is analyzed by Monte Carlo simulation, and the measurement accuracy is compared with that of the barycenter measurement method based on horizontal posture. Finally, the experiment platform of barycenter measurement was built in the laboratory and the experiments were carried out. Findings The experimental results show that the barycenter measurement method proposed in this paper has obvious advantages in measurement accuracy and efficiency compared with the traditional method. Originality/value This method can be used to measure the barycenter of different types of aircraft quickly and automatically.

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Product Design Aspects for Design of Accurate Mass Properties Measurement System for Aerospace Vehicles

Cited by 12 publications

References 0 publications

A Structure for Accurately Determining the Mass and Center of Gravity of Rigid Bodies

A Structure for Accurately Determining the Mass and Center of Gravity of Rigid Bodies

General Mass Property Measurement Equipment for Large-Sized Aircraft

Measurement method of aircraft barycenter based on multi posture

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