Passive load alleviation in the design of a strut braced wing transonic transport aircraft. Request pdf conceptual design studies of a strutbraced wing transonic transport recent transonic airliner designs have generally converged upon a common cantilever low wing configuration. Specify camber and centerline sheeting of an airfoil along with hundreds of other features. Full text of flexible wing model for structural sizing and multidisciplinary design optimization of a strut braced wing see other formats am a a a c3 aiaa 200027 flexible wing model for structural sizing and multidisciplinary design optimization of a strut braced wing f.
A round 18 wire would have way less drag than, say, a 1 round lift strut, obviously. Aerodynamic efficiency obtained by cfse with hifi aerodynamic simulations. Pdf strutbraced wing sbw is considered in the ongoing onera. Static aeroelastic loads, aeroelastic divergence and aileron reversal criteria are calculated directly with small matrices suitable for implementation in spreadsheet software. Multidisciplinary design optimization of a strutbraced wing aircraft. Boeing revealed the newest transonic trussbraced wing ttbw, which researchers say will fly higher and faster than the previous ttbw concepts. Pdf passive load alleviation in the design of a strutbraced wing. The choice of cantilever versus braced wing is a tradeoff between weight, drag and configuration integration issues. To gain a better understanding of the current design and its shortcomings, i sought to analyze the existing wing structure under the anticipated flight loads and characterize the previous failure of the front lift strut. A7 strut braced wing concept transonic wing design dept. Superthin wing design cuts fuel costs in half by david szondy. Also, more wing weight reduction is obtained by optimizing the strut force, a strut offset length, and the wing strut junction location. In this paper, a trussbraced wing aircraft model similar to.
This framework is then used to perform conceptual design studies and mdo on a strut braced wing con guration. Studies found that the sbw configuration showed savings in takeoff gross weight of up to 19%, and savings in fuel weight of up to 25% compared to a similarly designed cantilever wing transport aircraft. However, such wing structures could suffer from a significant weight penalty. Strutbraced wing, laminar, aerodynamics, structures. The new configuration is designed to offer unprecedented aerodynamic efficiency while flying at mach 0. The basic concept for the strutbraced wing built in. It is one of a series of concepts put forward in response to a request for proposals for future aircraft issued by nasa. All the main disciplinary domains, including on board system design and cost assessment, are accounted for in the. Passive load alleviation in the design of a strutbraced wing transonic transport.
Multidisciplinary design optimization of a transonic commercial transport with strut braced wing. Planes like the invader mk 3, the skydock, and the backyard flyer swing wing appear to be the only planes without some kind of strut or wire bracing. Winfoil is a an aeronautical computer aided design tool for designing, analysing and modifying model aircraft. On boeings concept aircraft, the sugarvolt, there are wing struts connecting the fuselage and the wings, which is for making sure that the wings do not bend too much during flight. Unistrut launches strongest strut bracket in the market the unistrut p2580 is the highest capacity cantilevered strut bracket in the market. The objective of this study is to use multidisciplinary design optimization mdo to investigate the use of trussbraced wing concepts in concert with other advanced technologies to obtain a significant improvement in the performance of transonic transport aircraft. Wingmaster wing designer is software for model airplane wing design. Introduction the strutbraced wing sbw design concept has been implemented today in many general aviation aircraft designs. One of such promising configurations studied at the multidisciplinary analysis and design center for advanced vehicles at virginia polytechnic institute and state university virginia tech is the strut braced wing sbw. Multidisciplinary design optimization of a strut braced wing transonic transport. This means that on a high wing airplane, the wing spar is in compression and the struts are in tension. The third generation ultralights have strut braced wings and airframe structure use 3axis control systems.
In our work we assumed that computational fluid dynamics cfd. Semantic scholar extracted view of subsonic ultra green aircraft research. Strutbraced wings are a good design option for airplanes like the zenith stol ch 750 super duty, where absolute maximum crosscountry performance is less important than. Since the wing is clamped to the fuselage, it acts as a cantilever beam in the negative load conditions and as a strutbraced beam in the positive load maneuvers. And the same for a streamlined wire vs a streamlined lift strut. Early aircraft had strut wings because engineers believed that thin wings promoted lift. Passive load alleviation in the design of a strutbraced. To account for the discretization the mesh would later be projected back onto the original cad.
Wing design parameters the design parameter like wing span, wing twist, taper ratio, wing sweep. The design of a trussbraced wing is a multidisciplinary design optimization mdo process that strives to achieve a delicate balance between aerodynamic and structural efficiencies. Pdf investigation of a strutbraced wing configuration for future. Engineers at boeing and nasa are collaborating on a lightweight, ultrathin transonic trussbraced wing ttbw concept, designed to be more aerodynamic and fuelefficient than current designs, as part of the subsonic ultra green aircraft research sugar program focusing on innovative aerospace concepts that reduce noise and emissions while. Preliminary design of a trussbraced naturallaminarflow. A braced multiplane may have one or more bays, which are the compartments created by adding interplane struts. A typical sequence of excavation in crosslot braced excavations is shown in figure 1.
Investigation of transonic trussbraced wing aircraft. Using the finite element software package comsol, the calculated aerodynamic loads are applied to the wing to check the wing reliability. It also provides the ability to print the design wing ribs, fuselage sides, wing and tail plans to any windows supported printer and export design components to dxf files for import into other cad programs such as autocad. Boeing and nasa unveil lightweight, ultrathin, more. University of washington 2011 capstone airplane design. Vehicle sketch pad vsp,9 which are front end programs that allow users to create a.
For a given wing area and span, a cantilever wing will have. University of washington 2011 capstone airplane design project the strut braced wing configuration for nonlinear aeroelasticity research just the takeoff and landing segments the william e. To address this issue, an innovative design strategy introduces a telescoping sleeve mechanism to allow the strut to be inactive during negative g maneuvers and active during positive g maneuvers. This paper presents a method for the wing weight estimation of strut braced wing aircraft in conceptual design. So looked at that way, the wires win aerodynamically even with 4 wires per wing vs 2 struts. The design is done corresponding to the calculated values with the help of designing software catia and the. Externally braced wings, also called semicantilever wings, have wires or struts to support the wing. Strutbraced wings are a good design option for airplanes like the zenith stol ch 750 super duty, where absolute maximum crosscountry performance is less important than takeoff distance and loadcarrying ability. Boeing sugar trussbraced wing tbw aircraft concept. The trussbraced wing configuration uses a main strut and a jury strut in order to.
Passive load alleviation in the design of a strutbraced wing transonic. The number of bracing struts depends on the internal layout of the wing itself. This heavy duty bracket is 35% stronger than competing brackets. Optimum wing aspect ratio is a compromise between wing weight and drag strutbraced wing configuration allows reduced wing weight at a given aspect ratio allows optimization to higher aspect ratios with large reductions in induced drag other studies suggest 510% fuel burn savings compared to equivalent conventional. It is shown that the designed wing could be a good candidate for similar general aviation airplane implementation. Conventional aluminum design or composites can be considered. Also, we collaborated with andy hahn at nasa ames, who helped us translate complex ram. Aerostructural modeling of the truss braced wing aircraft using potential method with correction methods for transonic viscous flow and wing strut interference aerodynamics jason fugate, nhan t.
This might be as silly question but is there any consensus on what the lightest wing design is for a homebuilt ultralight. A considerable reduction in drag can be obtained by using a high aspect ratio wing with thin airfoil sections and tipmounted engines. Multidisciplinary design optimization of a transonic. The method is simple to implement and captures important effects for the design of high aspect ratio braced wings. Click here to find out the design of braced excavations with deepex software.
A strutbraced wing consists of a main wing with internal spars braced by either a single strut or a pair of struts. Optimization tools dot software from vanderplatts is used to perform the. I found a total weight change of 34 lbs for my design. Structural optimization and design of a strutbraced wing. The design process consists of a multilevel multidisciplinary architecture, progressing from the initial conceptual synthesis to the physics based analysis. The method is simple to implement while still capturing important effects for early design estimates. However, the sbw concept has never been used on a transonic passenger transport aircraft. In june 1996, a research program was begun at the mad center at virginia tech to evaluate the benefits of the trussbraced wing configuration at. Comparative assessment of strutbraced and trussbraced wing. Aerodynamic shape optimization of a trussbracedwing aircraft. Full cantilever wings have no external bracing and are supported internally aluminum is the most common material from which to construct wings, but they can be wood covered with fabric, and occasionally a magnesium alloy has been used. Structural optimization and design of a strutbraced wing aircraft.
The long slender wing would employ structural bracing via the use of axially loaded strut members to provide intermediate span. Large wing attach fittings can influence the fuselage and result in higher drag. Section iii then describes the application of this framework to the analysis and design optimization of a strut braced wing con guration. The struts rest on a series of wale beams that distribute the strut load to the diaphragm wall. Werner pfenniger at northrop first proposed this idea in the early 1950s. Full text of flexible wing model for structural sizing. Moreover, the strut force the force carried by the strut at the 2.
Could the wing struts cause aerodynamic instabilities, and could this make the aircraft more efficient, or less efficient. Due to the especially thin design of the wing their was not enough internal room for adequate bracing for a wing span wide enough to carry the load, so they made two shorter wing with external bracing. Design and stress analysis of a general aviation aircraft wing. Conceptual design studies of a strutbraced wing transonic. The system can also be used in any plane to prop steel, concrete or masonry structures. Naghshinehpour thesis submitted to the faculty of the virginia polytechnic institute and state university in partial fulfillment of the requirements for the degree of. It can be flown with different wingstrut and wingtruss systems the complete design, test, and construction cycle was completed in 15 weeks by a group of seniors taking the capstone airplane. When you use the impressive power and precision of a silhouette machine, you are investing in the appearance and quality of every design you create with one of the most trusted names on the market. Design optimization of a trussbracedwing transonic. Truss braced wing aircraft concepts provide a structural solution to high aspect ratio wing aircraft designs. Conceptual design method for the wing weight estimation of.
Conceptual design of a strutbraced wing configuration. High aspect ratio wing design can provide another opportunity for. Pdf multidisciplinary design optimization of a transonic. This paper presents a study of aircraft featuring trussbraced wing configurations. Structural optimization and design of a strut braced wing aircraft figure 2. Multidisciplinary design optimization of a strutbraced. Aeroelasticity of axially loaded aerodynamic structures. Structural optimization and design of a strut braced wing aircraft amir h.