Browse Topic: Planning / scheduling
This digital data model for the AS9100D aerospace quality management standard provides a structured, machine‑readable representation of the requirements, definitions, and industry‑specific enhancements that distinguish AS9100D from its ISO 9001:2015 foundation. Designed to support interoperability across aviation, space, and defense organizations, the model encapsulates the standard’s clause hierarchy, terminology, and compliance attributes in a format optimized for automated processing, validation, and lifecycle management. The model incorporates the revised clause structure introduced with ISO 9001:2015 and extends it with aerospace‑specific obligations, risk‑based considerations, and supply‑chain expectations defined by the International Aerospace Quality Group (IAQG). It captures the relationships between core quality management system elements—such as leadership, planning, operational control, and performance evaluation—while embedding additional AS9100D requirements related to
Time-Sensitive Networking (TSN) is an emerging technology that has garnered popularity among the US DoD and others for its deterministic properties while using flexible, ubiquitous Ethernet as its core. However, individual TSN devices will support the TSN features of only some of the vast array of amendments and extensions that make up the full IEEE 802 TSN standards. This functional and modular approach offers great flexibility, but it also increases the complexity of network planning, analysis, verification, etc. as well as potentially leading to unexpected emergent behavior that must be addressed before a TSN network can be truly said to be qualified for use with safety-critical systems. Using industry experience gained certifying other deterministic networks to DO-254 and DO-178C Design Assurance Level A (DAL-A) and applying it to the analysis, testing, and validation of a deterministic TSN Ethernet digital backbone offers a roadmap for overcoming these challenges. Such an approach
Previous work documented the use of IVHMS data on the U.S. Army's fleet of UH-60 Black Hawk helicopters to update the fatigue lives of six specific components on the A/L and M models. This paper documents a significant expansion of the level of data applied to the usage spectrum, as well as applying it to all components on the aircraft. As a design spectrum for the yet to be fielded Improved Turbine Engine (ITE) equipped UH-60M, changes due to new engine capability needed to be addressed. The new spectrum has been developed and is being used for planning of flight testing. The spectrum along with flight test loads will be used to generate fatigue lives for the new aircraft. Once deployed for several years the spectrum will be reviewed to determine if any changes are needed. This work highlights what the Army considers to be the most significant issues when applying monitored usage to critical fatigue components, and rationale for dealing with issues such as insufficient data for
SAE J4001 provides instruction for evaluating levels of compliance to SAE J4000. Component text (Sections 4 to 9) from SAE J4000 is included for convenience during the evaluation process. Applicable definitions and references are contained in SAE J4000. SAE J4000 tests lean implementation within a manufacturing organization and includes those areas of direct overlap with the organization’s suppliers and customers. If applied to each consecutive organizational link, an enterprise level evaluation can be made. SAE J4001 relates the following approximate topic percentages to the implementation process as a whole: SAE J4001 is to be applied on a specific component basis. Each of the 52 components tests part of, one, or multiples of the specific requirements of lean implementation. Implementation throughout an organization may be measured by evaluating all of the components. The level of compliance for each component relative to best practice may be used as a reference by an organization to
A new method for rapidly planning and dynamically replanning low noise rotorcraft flight operations has been developed and is discussed. A large database of rotorcraft maneuver segments is generated, and an acoustic cost is assigned to each segment by using a computationally efficient semiempirical rotorcraft noise modeling method that accurately models the changes in rotor noise caused by maneuvering flight. Combinatoric optimization techniques are then employed to combine these maneuver segments into a low noise optimal flight path. A simple heuristic for estimating the total acoustic cost required to reach the target location is developed and incorporated into the search algorithm, allowing the computation of low noise paths in seconds. A procedure for implementing an "anytime" version of the method is described, enabling feasible solutions to be dynamically replanned "on the fly"—i.e., in fractions of a second—and refined over time to a low noise optimal solution.
ABSTRACT The paper presents quantitively the range of challenges that attend the S-70i Black Hawk start production - from prototype building to serial production. This article focuses not only on engineering tasks however partially also describes challenges connected to the following areas: business, quality, logistic, manufacturing planning and organization, ground and flight testing, pilots and mechanics training and jobs, PR activity. The volume of presented information are regulated and limited by the ITC regulations and IP protections.
ABSTRACT This paper focuses on the problem of payload transportation by a flock of rotary-wing vehicles. The flock includes several aerial vehicles and a cable-suspended load that has to be transported from an initial position to a goal position in an a priori known environment. The development of several novel techniques including a detailed modeling of the quadrotor dynamics, a control architecture, and a dedicated motion planning algorithm based on a modified Rapidly-Explored Random Tree (RRT) method for the flock are presented in this paper. The proposed system modules were checked in different cluttered environments and under different circumstances and uncertainties. Monte-Carlo simulations were conducted as well in order to assess the performance of the planning approach.
The EUROPA planning system is a general-purpose, reusable, artificial intelligence software system for automatically generating plans for performing complex activities in parallel, in accordance with constraints on activities and their interactions. One part of the system input is a domain model, which describes the subsystems in question, their possible activities, and the associated constraints. The other part is a plan request, consisting of a set of activities and constraints among them. Given these two inputs, the system will try to find a complete plan that allows all aspects of the plan request to be done, while satisfying the constraints specified in the domain model. This functionality includes the capability of verifying that a plan satisfies all constraints. The system is designed to allow different techniques to be used to complete or verify plans.
ABSTRACT This paper extends the author's prior effort to provide a framework for fair, early, and meaningful assessment of rotorcraft fatigue durability. In this paper a comprehensive set of fatigue load spectra have been characterized for a conventional military rotorcraft and provided for potential future use by the reader. The author's method of mixed-Weibull parameterization has been improved over the prior method. Mixed-Weibull parameterization allows grouping of various sets of load paths as well as analytical comparison of the distributions. This paper includes an assessment of sensitivity to changes in airspeed limitations at altitude, as well as an assessment of sensitivity to human influence during mixed-Weibull parameterization. Once standardized mission spectra are established, they will prove useful in fatigue life specification verification, preliminary and detailed design, and structural test planning.
This document defines a set of standard application layer interfaces called JAUS Mission Spooling Services. JAUS Services provide the means for software entities in an unmanned system or system of unmanned systems to communicate and coordinate their activities. The Mission Spooling Services represent the platform-independent capabilities commonly found across all domains and types of unmanned systems. At present, 1 service is defined in this document (more services are planned for future versions of this document): Mission Spooler: Stores mission plans, coordinates mission plans, and parcels out elements of the mission plan for execution The Mission Spooler service is described by a JAUS Service Definition (JSD) which specifies the message set and protocol required for compliance. The JSD is fully compliant with the JAUS Service Interface Definition Language [JSIDL].
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