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. High aspect ratio wing design can provide another opportunity for. Introduction the strutbraced wing sbw design concept has been implemented today in many general aviation aircraft designs. Preliminary design of a trussbraced naturallaminarflow. In this paper, a trussbraced wing aircraft model similar to. 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. This might be as silly question but is there any consensus on what the lightest wing design is for a homebuilt ultralight. Multidisciplinary design optimization of a strut braced wing transonic transport.
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. Conceptual design of a strutbraced wing configuration. Full text of flexible wing model for structural sizing. Passive load alleviation in the design of a strut braced wing transonic transport aircraft. A round 18 wire would have way less drag than, say, a 1 round lift strut, obviously. All the main disciplinary domains, including on board system design and cost assessment, are accounted for in the.
Boeing revealed the newest transonic trussbraced wing ttbw, which researchers say will fly higher and faster than the previous ttbw concepts. Boeing truss braced wing are airliner designs studied by boeing with braced, high aspect ratio wings. Boeing sugar trussbraced wing tbw aircraft concept. This framework is then used to perform conceptual design studies and mdo on a strut braced wing con guration. Unistrut launches strongest strut bracket in the market the unistrut p2580 is the highest capacity cantilevered strut bracket in the market. Pdf multidisciplinary design optimization of a transonic. 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.
Early aircraft had strut wings because engineers believed that thin wings promoted lift. 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. Multidisciplinary design optimization of a strutbraced. Multidisciplinary design optimization of a strutbraced wing aircraft. The new configuration is designed to offer unprecedented aerodynamic efficiency while flying at mach 0.
This heavy duty bracket is 35% stronger than competing brackets. Large wing attach fittings can influence the fuselage and result in higher drag. Naghshinehpour thesis submitted to the faculty of the virginia polytechnic institute and state university in partial fulfillment of the requirements for the degree of. And the same for a streamlined wire vs a streamlined lift strut. It is shown that the designed wing could be a good candidate for similar general aviation airplane implementation. The method is simple to implement while still capturing important effects for early design estimates. Passive load alleviation in the design of a strutbraced wing transonic.
Vehicle sketch pad vsp,9 which are front end programs that allow users to create a. Could the wing struts cause aerodynamic instabilities, and could this make the aircraft more efficient, or less efficient. 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. So looked at that way, the wires win aerodynamically even with 4 wires per wing vs 2 struts. Click here to find out the design of braced excavations with deepex software. 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.
Section iii then describes the application of this framework to the analysis and design optimization of a strut braced wing con guration. Optimization tools dot software from vanderplatts is used to perform the. Conceptual design method for the wing weight estimation of. University of washington 2011 capstone airplane design. Specify camber and centerline sheeting of an airfoil along with hundreds of other features. Comparative assessment of strutbraced and trussbraced wing. For a given wing area and span, a cantilever wing will have. Also, we collaborated with andy hahn at nasa ames, who helped us translate complex ram. The method is simple to implement and captures important effects for the design of high aspect ratio braced wings. Boeing and nasa unveil lightweight, ultrathin, more.
The design is done corresponding to the calculated values with the help of designing software catia and the. A considerable reduction in drag can be obtained by using a high aspect ratio wing with thin airfoil sections and tipmounted engines. A7 strut braced wing concept transonic wing design dept. 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. However, such wing structures could suffer from a significant weight penalty. 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. 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. The third generation ultralights have strut braced wings and airframe structure use 3axis control systems. 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. This paper presents a method for the wing weight estimation of strut braced wing aircraft in conceptual design.
Conventional aluminum design or composites can be considered. The long slender wing would employ structural bracing via the use of axially loaded strut members to provide intermediate span. The trussbraced wing configuration uses a main strut and a jury strut in order to. Multidisciplinary design optimization of a transonic commercial transport with strut braced wing. Winfoil is a an aeronautical computer aided design tool for designing, analysing and modifying model aircraft.
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. The number of bracing struts depends on the internal layout of the wing itself. Truss braced wing aircraft concepts provide a structural solution to high aspect ratio wing aircraft designs. Pdf strutbraced wing sbw is considered in the ongoing onera. Pdf investigation of a strutbraced wing configuration for future. 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. 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. Moreover, the strut force the force carried by the strut at the 2. Conceptual design studies of a strutbraced wing transonic. 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. Multidisciplinary design optimization of a transonic. Structural optimization and design of a strutbraced wing. Using the finite element software package comsol, the calculated aerodynamic loads are applied to the wing to check the wing reliability. Wing design parameters the design parameter like wing span, wing twist, taper ratio, wing sweep.
Superthin wing design cuts fuel costs in half by david szondy. The subsonic ultra green aircraft research sugar project is a multiphase, collaborative research project conducted by nasa and boeing research and technology. Wingmaster wing designer is software for model airplane wing design. The system can also be used in any plane to prop steel, concrete or masonry structures. The basic concept for the strutbraced wing built in. Pdf passive load alleviation in the design of a strutbraced wing. Aerodynamic efficiency obtained by cfse with hifi aerodynamic simulations. 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.
This means that on a high wing airplane, the wing spar is in compression and the struts are in tension. 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. A typical sequence of excavation in crosslot braced excavations is shown in figure 1. 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.
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. The choice of cantilever versus braced wing is a tradeoff between weight, drag and configuration integration issues. 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. The struts rest on a series of wale beams that distribute the strut load to the diaphragm wall. Structural optimization and design of a strut braced wing aircraft figure 2.
A strutbraced wing consists of a main wing with internal spars braced by either a single strut or a pair of struts. Design and stress analysis of a general aviation aircraft wing. Structural optimization and design of a strut braced wing aircraft amir h. 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. Semantic scholar extracted view of subsonic ultra green aircraft research. Aerodynamic shape optimization of a trussbracedwing 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. The truss topology introduces several opportunities. Investigation of transonic trussbraced wing aircraft. In our work we assumed that computational fluid dynamics cfd. Also, more wing weight reduction is obtained by optimizing the strut force, a strut offset length, and the wing strut junction location.
Werner pfenniger at northrop first proposed this idea in the early 1950s. Design optimization of a trussbracedwing transonic. Passive load alleviation in the design of a strutbraced. Strutbraced wing, laminar, aerodynamics, structures. The design process consists of a multilevel multidisciplinary architecture, progressing from the initial conceptual synthesis to the physics based analysis. Structural optimization and design of a strutbraced wing aircraft. 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. Aeroelasticity of axially loaded aerodynamic structures. A braced multiplane may have one or more bays, which are the compartments created by adding interplane struts. I found a total weight change of 34 lbs for my design. However, the sbw concept has never been used on a transonic passenger transport aircraft. It is one of a series of concepts put forward in response to a request for proposals for future aircraft issued by nasa. Passive load alleviation in the design of a strutbraced wing transonic transport. Static aeroelastic loads, aeroelastic divergence and aileron reversal criteria are calculated directly with small matrices suitable for implementation in spreadsheet software.
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