scholarly journals A Wire-Driven Parallel Suspension System with 8 Wires (WDPSS-8) for Low-Speed Wind Tunnels

10.5772/9194 ◽  
2010 ◽  
Author(s):  
Yaqing Zheng ◽  
Qi Lin ◽  
Xiongwei Liu
Keyword(s):  
Suspension System ◽  
Wind Tunnels ◽  
Low Speed

scholarly journals Preliminary Step Towards Wire-Driven Parallel Suspension Systems for Static and Dynamic Derivatives of the Aircraft in Low-Speed Wind Tunnels

2010 ◽  
Vol 7 (1) ◽  
pp. 22 ◽  
Author(s):  
Yaqing Zheng ◽  
Qi Lin ◽  
Xiongwei Liu ◽  
Peter Mitrouchev
Keyword(s):  
Wind Tunnel ◽  
Research Work ◽  
Wind Tunnel Test ◽  
Theoretical Aspect ◽  
Suspension System ◽  
Wind Tunnels ◽  
Low Speed ◽  
Suspension Systems ◽  
Dynamic Quality ◽  
Derivatives Of

 The wind tunnel test is one important way to obtain the aerodynamic derivatives of aircrafts. These derivatives are necessary when the guidance and control systems of the aircraft are designed and when the dynamic quality of the aircraft is analyzed as well. The results of experiments of the static derivatives and dynamic derivatives of the aircraft in low-speed wind tunnels have revealed that there are some unavoidable drawbacks such as the interference of the streamline flow brought about by the strut in the traditional strut suspension system. A cable-mounted system is very suitable for experiments of the static derivatives of an aircraft, but it cannot be used in the experiments of dynamic derivatives. In order to use the same wire-driven parallel suspension system to realize the static and dynamic derivates experiments in low-speed wind tunnels, a survey of the research work addressed within the Wire-Driven Parallel Suspension Systems (WDPSS-8) project is presented in this paper. The results show that WDPSS-8 can be successfully used in experiments of static derivatives, and that it has potentiality to be used in experiments of dynamic derivatives. In the issues in the theoretical aspect the issues have been handled. However, much work should be done in the experimental aspects. The research outcomes of WDPSS-8 will help the Chinese set up Chinese brands in the field of wind tunnel tests of aircrafts. 

The design of low-speed wind tunnels

1964 ◽  
Vol 5 ◽  
pp. 1-69 ◽  
Author(s):  
P. Bradshaw ◽  
R.C. Pankhurst
Keyword(s):  
Wind Tunnels ◽  
Low Speed

Highlights of the Lockheed Martin F-35 STOVL jet effects programme

2009 ◽  
Vol 113 (1140) ◽  
pp. 119-127 ◽  
Author(s):  
R. Hoggarth ◽  
Richard Mange
Keyword(s):  
Wind Tunnel ◽  
System Development ◽  
Ground Effect ◽  
Wind Tunnels ◽  
Wind Tunnel Model ◽  
Low Speed ◽  
Test Conditions ◽  
Tunnel Model ◽  
Testing Techniques ◽  
Flight Regimes

Abstract This paper presents the highlights of the F-35 STOVL Jet Effects (SJE) test effort during the complete four years of the System Development and Demonstration phase. A new 12%-scale F-35 SJE model was tested in the German-Dutch wind-tunnels Large Low Speed Facility in order to gather STOVL jet-induced Forces and Moments. Ten separate test entries were conducted, covering all STOVL flight regimes from pure hover in ground effect through transition to wing borne flight. This paper will present an overview of this program, including a detailed description of the wind-tunnel model, testing techniques, test conditions, and accomplishments.

scholarly journals Experimental Research on an Active Sting Damper in a Low Speed Acoustic Wind Tunnel

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Jinjin Chen ◽  
Xing Shen ◽  
Fanfan Tu ◽  
Ehtesham Mustafa Qureshi
Keyword(s):  
Wind Tunnel ◽  
Wind Tunnels ◽  
Low Speed ◽  
Model Flow ◽  
Vibration Problems ◽  
Flow Turbulence ◽  
Active Damper ◽  
Flow Interference ◽  
Piezoelectric Devices ◽  
Algorithm Verification

Wind tunnels usually use long cantilever stings to support aerodynamic models in order to reduce support system flow interference on experimental data. However, such support systems are a potential source of vibration problems which limit the test envelope and affect data quality due to the inherently low structural damping of the systems. When exposed to tunnel flow, turbulence and model flow separation excite resonant Eigenmodes of a sting structure causing large vibrations due to low damping. This paper details the development and experimental evaluation of an active damping system using piezoelectric devices with balance signal feedback both in a lab and a low speed acoustic wind tunnel and presents the control algorithm verification tests with a simple cantilever beam. It is shown that the active damper, controlled separately by both PID and BP neural network, has effectively attenuated the vibration. For sting mode only, 95% reduction of displacement response under exciter stimulation and 98% energy elimination of sting mode frequency have been achieved.

Magnetic Suspension for Low-Speed Vehicles

1978 ◽  
Vol 100 (4) ◽  
pp. 333-342 ◽  
Author(s):  
P. K. Sinha
Keyword(s):  
High Reliability ◽  
Suspension System ◽  
Urban Transport ◽  
Magnetic Suspension ◽  
Experimental Results ◽  
Performance Criteria ◽  
Transport Systems ◽  
Vehicle Suspension ◽  
Low Speed ◽  
Capital Costs

Several forms of novel suspension systems for passenger-carrying vehicles are currently being investigated throughout the world. Most of these, however, are aimed at high-speed, intercity transport systems, and comparatively less development work has been undertaken to provide a new form of low-speed system for urban-transportation. The possibility of using controlled direct-current electromagnets for low-speed (up to 70 kph) vehicle suspension has been explored in this paper. This system, also known as ferromagnetic or attraction suspension system, offers a very attractive combination of design simplicity, low operating and maintenance costs, high reliability and virtually silent operation. This system is also considered to have capital costs comparable with alternative forms of urban-transport systems and could be designed to fit into the existing fabric of cities and towns. The feasibility of the d-c system is illustrated here through analytical and experimental results of the ride and track-clearance characteristics for a single-degree of freedom suspension system. These results are used to formulate a procedure for designing a multimagnet vehicle suspension system. Main design and performance criteria for maglev vehicles are discussed in the context of experimental results obtained from test vehicles. Engineering aspects of some of the system components have been presented with a view to evaluating their suitability for low-speed systems.

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