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Countering the Destabilizing Effects of Shifted Loads through Pneumatic Suspension Design

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Virginia Tech, USA-Yang Chen, Mehdi Ahmadian
  • Journal Article
  • 10-04-01-0001
Published 2019-11-08 by SAE International in United States
This article proposes a novel approach to reduce the destabilizing impacts of the shifted loads of heavy trucks (due to improper loading or liquid slosh) by pneumatic suspension design. In this regard, the pneumatically balanced suspension with dual leveling valves is introduced, and its potential for the improvement of the body imbalance due to the shifted load is determined. The analysis is based on a multi-domain model that couples the suspension fluid dynamics, shifted-load impacts, and tractor-semitrailer dynamics. Truck dynamics is simulated using TruckSim, which is integrated with the pneumatic suspension model developed in AMESim. This yields a reasonable prediction of the effect of the suspension airflow dynamics on vehicle dynamics. Moreover, the ability of the pneumatic suspension to counteract the effects of two general shifted loads - static (rigid cargo) and dynamic (liquid) - is studied. The simulation results indicate that the dual-leveling-valve suspension results in a reduction in roll angle and roll rate of the vehicle body for both static and dynamic load-shifting cases, as compared to the conventional single-leveling-valve suspension. Suppression of…
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Optimization of Pneumatic Network Actuators with Isosceles Trapezoidal Chambers

SAE International Journal of Materials and Manufacturing

Nanjing University of Aeronautics and Astronautics, China-Shuxin Wang
Southeast University, China-Fangyu Zhou, Juekuan Yang
  • Journal Article
  • 05-12-03-0016
Published 2019-10-04 by SAE International in United States
Soft actuators with pneumatic network have innovative potential applications in medical and rehabilitation areas. The performance of this kind of actuators is determined by the design of chambers and the properties of the active extensible layer and the passive inextensible layer. In this article, actuator with isosceles trapezoidal chambers is proposed. Orthogonal experiment design and finite element method are used to optimize the structure of actuators. Results indicate that adding constrain-limiting paper in the passive layer can significantly reduce the bending radius. Position of the paper in the passive layer also affects the bending radius. Actuators with trapezoidal chambers can have a smaller bending radius compared with that with rectangle chambers. The bending radius decreases as the ratio of short base to long base of trapezoid decreases. Increasing the number density of chambers can further reduce the bending radius. In addition, we find that the optimized actuator not only has a smallest bending radius but also can exert a largest force at its tip.
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A New Positioning Device Designed for Aircraft Automated Alignment System

Shanghai Jiao Tong University-Jie Huang, Long Yu, Yuhan Wang
Shanghai Top NC Tech Co Ltd-Yilian Zhang
Published 2019-09-16 by SAE International in United States
Accurate and fast positioning of large aircraft component is of great importance for Automated Alignment System. The Ball joint is a widely-used mechanical device connecting the aircraft component and positioners. However, there are some shortcomings for the device in man-machine engineering, such as the entry state of the ball-head still needs to be confirmed by the workers and then switched to the locking state manually. To solve above problems, a new positioning mechanism is present in this paper, which consists of a ball-head and a ball-socket. The new device is equipped with a monocular vision system, in which a calibrated industrial camera is used to collect the images of the ball-head. And then, the 3-D coordinate of the ball-head center is calculated by a designed algorithm, guiding the positioner to capture the ball-head. Once the ball-head gets into the ball-socket, the pneumatic system will drive the pistons to move to the specified location. Meanwhile, the amount of compression of a set of springs has changed, so the steel balls are compelled to compress, contact or…
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Preliminary Design of Hydraulic and Pneumatic System Architectures for a Morphing Flight Control Structure

German Aerospace Center DLR-Michael Schäfer, Andreas Schäfer, Oliver Bertram
Published 2019-09-16 by SAE International in United States
Bionics in aeronautics has the potential to increase the performance and efficiency of aircraft significantly. Inspired by the wings of birds, morphing wing structures have been extensively investigated over the last decades. The continuous adaption of the wings over a large scale of the flight envelope enables an optimization of the aerodynamic characteristics and, this way, a reduction of the fuel consumption. Additionally, those structures could support or replace traditional flight control surfaces. Depending on the morphing technology, different systems may be suitable to actuate the morphing structure. An early inclusion of the system architecture into the development of the morphing technology enables designing an optimal system in compliance with all requirements. Therefore, this paper discusses the conceptual design of system architectures for a novel morphing wing structure that is used for flight control. The benefits of morphing structures for aircraft applications are shown and the functionality of the used morphing structure is introduced. The morphing structure was designed to be actuated by fluids and is compatible with different gases and liquids. Since the fluid…
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HOSE ASSEMBLY, METAL - MEDIUM PRESSURE, FLARED, WELDED, STRAIGHT TO 90°

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS5460C
  • Current
Published 2019-06-03 by SAE International in United States
No Abstract Available.
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HOSE ASSEMBLY, METAL - MEDIUM PRESSURE, FLARED, WELDED, 45° TO 45°

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS5461C
  • Current
Published 2019-06-03 by SAE International in United States
No Abstract Available.
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HOSE ASSEMBLY, METAL - MEDIUM PRESSURE, FLARED, WELDED, 90° TO 90°

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS5463C
  • Current
Published 2019-06-03 by SAE International in United States
No Abstract Available.
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HOSE ASSEMBLY, METAL - MEDIUM PRESSURE, FLARED, WELDED, STRAIGHT TO 45°

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS5459C
  • Current
Published 2019-06-03 by SAE International in United States
No Abstract Available.
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HOSE ASSEMBLY, METAL - MEDIUM PRESSURE, FLARED, WELDED, 45° TO 90°

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS5462C
  • Current
Published 2019-06-03 by SAE International in United States
No Abstract Available.
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Annotation ability available

Pneumatics for Mechanical Motion

  • Magazine Article
  • TBMG-34574
Published 2019-06-01 by Tech Briefs Media Group in United States

Employing fluid power to achieve mechanical motion can be implemented via hydraulics using uncompressible liquids or via pneumatics using compressible gasses; typically, air. The latter provides several distinct advantages, making it a popular choice for many mechanical applications. Indeed, this isn’t a recent development, as using pressurized air for industrial applications and automated machinery has a history extending back well over 100 years.