A survey of load methodologies for shuttle orbiter payloads

Loads methods currently being used to design shuttle orbiter payloads are summarized. Methods used for the design of payloads launched by expendable launch vehicles are described in historical perspective. Experiences gained from expendable launch vehicle payloads are used to develop methodologies for the space shuttle orbiter payloads. The objectives for the development of a new methodology for the shuttle payloads are to reduce the cost and schedule for the payload load analysis by decoupling the payload analysis from the launch vehicle to the maximum extent possible. Methods are described for payload member load estimation or obtaining upper bounds for dynamic loads, as well as load prediction or calculating actual transient member load time histories

Development and correlation: Viking Orbiter analytical dynamic model with modal test

The Viking Orbiter (VO) experience in the achievement of a mathematical model is described along with the following project activities: (1) the generation of the overall plan for load analysis, an analytical dynamic model, and development tests; (2) the performance of VO subsystem static and modal tests; and (3) the correlation of the VO system model analysis and test. Success is attributed to the coordination of analysis and test using substructure modal coupling techniques

Summary of Voyager Design and Flight Loads

Estimates of flight loads for Voyager 1 and Voyager 2 are summarized and compared to the Voyager design loads obtained from the shock spectra/impedance method and to the loads obtained using space vehicle transient loads analysis. These estimates were obtained by using the measured flight accelerations at the launch vehicle/spacecraft interface as forcing functions for the Voyager mathematical model. Based on these data, an assessment of the shock spectra/impedance loads method used for Voyager is presented. The following conclusions were reached: (1) the shock spectra approach provided reasonable conservative design loads for Voyager, (2) care has to be executed to insure that all critical events are accounted for in constructing shock spectra envelopes, (3) the selection of critical events is not always obvious, especially for those flight events wherein the spacecraft dynamic characteristics are important, and (4) the success of the method is strongly dependent on the analysts' experience and judgement

Computation of torsional vibration modes of Ranger and Surveyor space vehicles

Mathematical model for calculating free torsion modes of Atlas Agena Ranger and Atlas Centaur Surveyor spacecraft

Pressure seal Patent

Pressure seals suitable for use in environmental test chamber

Parametric study of two planar high power flexible solar array concepts

The design parameters examined were: frequency, aspect ratio, packaging constraints, and array blanket flatness. Specific power-to-mass ratios for both solar arrays as a function of array frequency and array width were developed and plotted. Summaries of the baseline design data, developed equations, the computer program operation, plots of the parameters, and the process for using the information as a design manual are presented

Management of squamous cell carcinoma on the thigh of a Nigerian Albino horse

The albino horse is the choice horse traditionally for ceremonial parade amongst the military and the police force in Nigeria because of their bright and attractive appearance on parade ground. Incidentally, squamous cell carcinoma (SCC) is the most common neoplasia of the skin in horses especially the albinos. An 8-year old albino parade stallion of Nigerian breed was presented with the chief complaint of growths on skin of right thigh and a tentative diagnosis of SCC was made. This case reports a successful management of SCC in albino horses with a view to improving management of the condition especially in veterinary settings with limited facility. The horse was restrained in standing position using hobbles and xylazine sedation. Local anaesthesia was achieved using Lidocaine hydrochloride. Growths were debulked in two surgeries, conducted 60 days apart. Vincristine 2 mg was administered intravenously twice at 3 weeks apart after each surgery but additionally, 1g was infiltrated at site after the second surgery, necessitated by re-growth of lesion. Wound was regularly cleaned and dressed. Blood and tissue samples were collected and analyzed for haematological and histopathological alterations respectively. Pre-treatment, haemogram showed neutropenia, lymphocytosis and hyperproteinemia. Histopathological examination revealed focal areas of keratin pearls, massive undifferentiated tumour cells at different stages of mitosis. It was concluded that surgical excision of lesions and vincristine therapy should be used in squamous cell carcinoma management in horses. Therefore, it was recommended that surgeons should be patient as multiple surgeries may be indicated depending on severity of squamous cell carcinoma.Keywords: Albino, Carcinoma, Horse, Management, Nigerian, Squamous Cell, Thig

Orbiting astronomical observatory A-2 space vehicle response to transient loadings at Atlas booster engine cutoff

Predicting structural response of OAO A-2 to transient loading at Atlas booster engine cut-of

A parametric study of variations in weight and performance characteristics of large-area solar arrays

Large area solar array structural design and performance test relationship