Struts

Struts
Name	Strut
Classification	Suspension component

Struts are structural components used in mechanical assemblies to resist longitudinal compression, support loads, and maintain alignment in a wide range of engineered systems. They appear in automotive suspension, aerospace airframes, civil engineering frameworks, naval architecture, and industrial machinery, linking to many notable developments associated with firms, designers, and landmark projects. Struts have evolved through interactions with influential organizations, patents, standards bodies, and historical programs that shaped modern engineering practice.

History

The development of struts intersects with early industrial milestones and leading institutions such as Wright brothers, Boeing, Rolls-Royce, General Motors, and Ford Motor Company, reflecting cross-pollination among pioneers like Orville Wright, Wilbur Wright, Henry Ford, and designers associated with Skoda Works. Military programs including World War I, World War II, Battle of Britain, and later conflicts influenced adoption by firms like Lockheed Martin, Northrop Grumman, and Bae Systems. Standards and research advanced through bodies such as American Society of Mechanical Engineers, British Standards Institution, Deutsches Institut für Normung, International Organization for Standardization, and technical committees tied to universities including Massachusetts Institute of Technology, Stanford University, Imperial College London, and Technische Universität Dresden. Notable projects that drove strut innovation include Spitfire, Boeing 747, Concorde, Apollo program, and landmark bridges like Golden Gate Bridge and Forth Bridge.

Types

Strut varieties align with roles in systems developed by manufacturers and designers such as Sachs GmbH, Monroe (company), Bilstein, KYB Corporation, and TRW Automotive. Common categories include suspension struts used on vehicles by Toyota Motor Corporation, Volkswagen, General Motors, and Honda Motor Company; shock-absorbing struts integrated in aircraft manufactured by Airbus, Embraer, Bombardier Aerospace, and Dassault Aviation; structural struts in buildings and bridges designed by firms like Arup Group and Foster and Partners; telescopic and hydraulic struts employed by NASA, European Space Agency, and Roscosmos; and lightweight composite struts developed by suppliers such as Hexcel and Toray Industries. Variants include MacPherson-type assemblies associated with Fiat, Peugeot, and Renault, double wishbone systems used by McLaren, Ferrari, and Lotus Cars, and strut-braced wings found on aircraft like those from Cessna and Piper Aircraft.

Design and Structure

Design practices reference computational methods and codes from institutions like ANSYS, Siemens PLM Software, Dassault Systèmes, and research at California Institute of Technology. Strut geometry considers load paths exemplified in structures by Guggenheim Museum Bilbao engineers and analysis techniques pioneered in studies at ETH Zurich and University of Cambridge. Key components draw on hardware standards from SAE International, Eurocode, and ASTM International. Designers reference case studies such as Brooklyn Bridge retrofits, Istanbul Airport terminals, and Burj Khalifa structural elements when integrating struts into complex assemblies. Aerodynamic and aeroelastic considerations link to work on Lockheed SR-71, McDonnell Douglas F-15, and Eurofighter Typhoon.

Materials and Manufacturing

Materials science for struts has parallels with developments at DuPont, 3M, Alcoa, ArcelorMittal, Nippon Steel, BASF, Covestro, SGL Carbon, and Mitsubishi Heavy Industries. Traditional steel alloys from mills like U.S. Steel coexist with aluminum series used by Alcoa and titanium supply chains involving VSMPO-AVISMA. Composite struts borrow from carbon-fiber technologies advanced by Bombardier, Airbus, and research at Imperial College London and University of Tokyo. Manufacturing processes include forging used by GKN, heat treatment practiced at Timken Company, welding techniques standardized by The Welding Institute, and additive manufacturing developed in labs at Oak Ridge National Laboratory and Fraunhofer Society.

Applications

Struts serve critical roles across projects and products produced by entities such as BMW, Mercedes-Benz, Audi AG, Rolls-Royce Holdings, Airbus Helicopters, Royal Dutch Shell offshore platforms, Bechtel Corporation construction, and Siemens AG industrial equipment. In automotive contexts they underpin models from Toyota Corolla, Ford F-150, Chevrolet Camaro, and Honda Civic. In aerospace they feature on platforms like Boeing 737, Airbus A320, Lockheed C-130 Hercules, and rotary-wing designs by Sikorsky Aircraft. Civil applications include tremie systems and temporary works on projects by Hochtief and Skanska. Marine installations cite work by Royal Navy and Maersk on hull and rigging components.

Performance and Safety

Performance assessment uses protocols from National Highway Traffic Safety Administration, European Union Agency for Railways, Federal Aviation Administration, and European Union Aviation Safety Agency regulations, along with crash studies influenced by Insurance Institute for Highway Safety. Safety-critical validation employs fatigue testing routines from NASA Glenn Research Center, vibration analysis methods developed by Oak Ridge National Laboratory, and certification schemas tied to Underwriters Laboratories. High-profile incidents and investigations by organizations such as National Transportation Safety Board, Air Accidents Investigation Branch, and Transportation Safety Board of Canada have shaped safety improvements and recall programs by manufacturers including Toyota, Volkswagen Group, and General Motors.

Maintenance and Inspection

Inspection regimes reference standards and guidance from Society of Automotive Engineers, International Civil Aviation Organization, American Institute of Steel Construction, and asset management practices used by Network Rail and Amtrak. Maintenance activities are common in fleets from Delta Air Lines, American Airlines, United Airlines, and ground operations at airports like Heathrow Airport and John F. Kennedy International Airport. Condition monitoring employs nondestructive testing techniques developed at TWI Ltd, ultrasonic inspection methods refined by GE Inspection Technologies, and predictive maintenance platforms from IBM and Siemens Digital Industries Software.

Category:Mechanical engineering