Engineering / Testing
Satellite Support Platforms
The process of satellite assembly, integration and test is exacting and requires considerable care. Moog’s satellite support platforms make these necessary steps easier by providing mechanical mounting and decoupling from your facility and its sources of mechanical disturbance. Platforms incorporate vibration isolation and are compatible within atmospheric and thermal-vacuum environments. They allow handling within your facilities while protecting your satellite or major subsystem from harm.
Gravity Offload / Low Frequency Suspension
Gravity affects structures differently on orbit but those structures must be integrated and validated on the ground. A compliant deployable appendage may be mass-optimized for in-space performance but unable to support its own weight on Earth. Moog’s gravity offload systems provide low frequency suspension with modes as low as 0.1 Hz, enabling you to test and validate space structures. With no sag, the suspension allows testing of fixed structures and additional features support structures with moving and deploying appendages.
Flight Motion Simulators
Flight testing of spacecraft and missiles is rarely practical or affordable. Moog’s offers products that extend the fidelity of hardware-in-the-loop testing, incorporating more realistic aspects of flight including high frequency structural response. With six degree of freedom motion bases, you can evaluate image motion compensation algorithms and position test articles relative to other verification equipment. Embedded systems and a user interface provide multiple options for control and coordination with your other ground test systems.
Static Test for Launch Vehicle Structures
New launch vehicles, small satellites and evolving structural concepts drive the need for more sophisticated testing and qualification before flight. Moog operates a facility under a cooperative research and development agreement with the Air Force that allows us to test a variety of payload and interstage structures, fairings and interface cones. Developed initially to qualify the ESPA ring, this facility has been adapted to test multiple composite and metal structures. It allows for application of multi-axis loads to simulate launch and includes extensive data acquisition. Custom fixtures augment the basic system for specialized tests.
Large Vibration-Isolated Bench
When a major aerospace company began to develop a new vacuum test facility for large space optics, Moog was trusted with providing vibration isolation. Moog delivered an optical bench that is over 25 meters long and supported by a soft isolation system. With suspension modes in the range of 1 to 2 Hz, the 250-ton bench is mechanically decoupled from the rest of the facility including pumps and other machinery, enabling a high fidelity representation of the space environment. Moog’s product also provides a software monitoring system and load leveling to accommodate moving payloads on the bench.
Precise Positioners for Large Optics
Space telescopes and other large optical systems require validation and verification before launch, and Moog provides precision positioning systems to support that ground test. These systems are based on our hexapod motion platforms with resolution measured in micrometers or smaller. In vacuum chamber operation, the systems allow software-controlled alignment of test optics and flight components to prove assembly and performance of subsystems and complete assemblies. Our comprehensive product offerings incorporate mechanical, electromechanical, electrical, firmware and software elements to provide turnkey systems.
Moog provides shock testing services with a test system that is ideally suited for quick turnaround while minimizing over-testing. The system uses high energy mechanical impacts to replicate pyrotechnic events.The system’s repeatability and tuning ability for Shock Response Spectrum (SRS) levels minimize excess loads to the unit, even when multiple shocks are required. The system provides a shaped shock level that is a cost effective alternative to pyrotechnic and other methods. Moog provides end-to-end shock testing services with NIST traceable calibrated equipment and data reporting using methods consistent with MIL-STD-810G.
Applications: Qualification units, Flight Hardware and Avionics, Failure Investigations, Shock mitigation isolator testing, and dampen material research
Servo-Hydraulic Test System with Temperature Control
Moog offers a wide range of testing capabilities in the Mountain View, CA and Albuquerque, NM locations. Both locations have operational servo-hydraulic shakers used for static and dynamic testing. The servo-hydraulic shaker can be used to measure the Direct Complex Stiffness (DCS) of isolators in which the spring stiffness and damping ratios are experimental found. The vibration properties of the isolators are extremely important when designing passive isolation systems for ground support and space flight needs. The servo-hydraulic shaker can also be used to measure force vs. velocity plots for viscous dampers, which is required for determining the damping ratios for the dampers or shocks. In addition, small stroke, low input dynamic random vibration and sine-sweep tests can be accommodated with the servo-hydraulic shaker and one of our slip tables (air bearing or profile linear guide). The servo-hydraulic shaker has the capability to be retrofitted with a thermal chamber for tests that need to be conducted at low or elevated temperatures. Moog’s experience and knowledge with servo-hydraulic shakers can help customers estimate mechanical properties and identify troublesome products.
Applications: Isolation testing, material testing, damper testing and flight hardware and avionics
Through decades of experience and modern data acquisition systems and sensors, Moog is a go-to choice for all vibration testing needs. Moog test engineers in Mountain View, CA and Albuquerque, NM have been supporting random vibration and sine sweep testing for customers such as the Air Force Research Laboratory (AFRL), NASA, Loral, Lockheed Martin Corp. and many others. Our Mountain View, CA has a 10kip electro-dynamic shaker capable of testing small to medium sized vibration critical components. Moog East Aurora offers larger shakers on the order of 25kip. If our in-house capability will not suffice, Moog has much experience sourcing testing houses and conducting vibration testing at other facilities.
Moog CSA has extensive experience designing, analyzing and manufacturing custom test fixtures to meet any customer’s needs. Our past designs implemented aluminum and magnesium fixtures that can either be mounted to a traditional slip table or expander head, or can serve as the slip table if test mass is critical. Our designs can be optimized to reduce weight and fixture modes.
Applications: Ground support equipment, automobiles, space flight structures and payloads.
Temperature and Vacuum Testing
Our environmental chamber provides up to 8 ft3 with computer-controlled temperature and humidity from -70oF to 350oF and between 0-90% RH. Long duration recording output is available for up to 8 channels simultaneously. Vacuum chambers are capable down to 1e-5 Torr and between -100o and 180oF. Portable control units enable temperature control anywhere in the laboratory via portable chambers to temperatures between 80o and 250oF.
Quiet Platform Testing
Moog CSA has a special facility and instrumentation just for testin in a quiet vibration environment. The facility can test articles in a micro-G vibration environment. Reaction forces may be documented at low levels as well as the transfer function properties. Tests can be performed between -80o and 200oF.
Moog has a vast knowledge in Experimental Modal Analysis, or more commonly referred to as modal testing. Modal testing is an extremely useful tool for correlating finite element models with the real structure. Multi-degrees-of-freedom (DOFs) are used to estimate the modal parameters of the structure (damped natural frequencies, damping ratios and mode shapes for a given structure). Inputs into the structure can be accomplished using an impact hammer or electro-dynamic shaker. Frequency Response Functions (FRFs) are measured and are then curve fitted to estimate the modal parameters.
Moog currently has an 80-channel test system and a wide range of accelerometers and impact hammers. Our modal analysis software offers the capability to “roam” response and input DOFs to further increase the total number of DOFs, thus allowing the structure to be further understood. Mode shapes (or eigenvectors) are estimated through the curve-fitting algorithm, which allow a useful means of animating the modes with a “stick” figure representation of the structure.
Applications: Ground support equipment, troublesome machinery, space flight structures and payloads.
On-Site Test Services
In addition to our in-house testing capabilities, Moog offers on-site test services to our customers. We have multiple data acquisition systems that are mobile and shippable. Whether the test is at our customer’s location or at a testing house, Moog strives to meet our customer’s testing and data needs.
On-site testing services include: modal, random vibration, sine sweep and static proof-load testing to mention a few.