A simplex control system monitoring concept is described, which has the potential of rapidly detecting computer command failures (hardware or software) in fly-by-wire control systems. The concept has been successfully...
详细信息
A simplex control system monitoring concept is described, which has the potential of rapidly detecting computer command failures (hardware or software) in fly-by-wire control systems. The concept has been successfully tested on a model of the NASA Vertical/Short Takeoff and Landing Research Aircraft in the Ames Research Center's Vertical Motion Simulator. The monitoring concept detected both slow and fast failures quickly enough to allow the pilot to make a safe recovery while performing landings on a destroyer-sized ship. The monitoring concept did not suffer from nuisance disconnects during the evaluations.
flight loads test is a primary structural verification test in fighter aircraft development. The indigenous defensive fighter flight loads test is the first complete flight loads test executed in Taiwan, Republic of C...
详细信息
flight loads test is a primary structural verification test in fighter aircraft development. The indigenous defensive fighter flight loads test is the first complete flight loads test executed in Taiwan, Republic of China. The basic configuration part of the flight test, including flight loads survey and structural demonstration, was accomplished in 42 flights with external store configurations to follow. Results give both similarity and deviation compared to predictions, and numerous valuable experiences were accumulated from ground calibration test and flight test. One significant improvement in flight test, the automatic roll capability, was introduced to greatly improve maneuver quality during testing and resulted in safe and efficient night test.
The intent of this Note is to show that the piecewise linear control allocation problem can be solved fast enough to be implemented in a digitalflight-control system. The approach taken here differs from the authors&...
详细信息
The intent of this Note is to show that the piecewise linear control allocation problem can be solved fast enough to be implemented in a digitalflight-control system. The approach taken here differs from the authors' initial paper on this subject in two ways. The first difference is a move away from the mixed-integer linear programming form of the optimization problem and to a linear programming formulation. The linear programming problem will be solved using a modified simplex algorithm where a rule-based approach is employed to enforce the necessary adjacency constraints on the interpolating coefficients. The second difference is that we solve a mixed optimization problem2 as opposed to the solution of the multibranch control allocation problem.' This allows us to achieve the same objective as before, but only having to solve one optimization problem instead of two. We will compare the performance of the simplex method with restricted basis entry rules to the mixed-integer formulation and show that the two approaches give equivalent solutions to the same set of control allocation problems. To perform this comparison, we will look at both closed-loop and open-loop control allocation problems. In the latter case, a set of control allocation problems are randomly selected and solved by each approach. For the former, we compare the algorithms in a digital simulation of a reentry vehicle on approach and landing.
Collision avoidance of UAV is an important function required from pilots and traffic controller as it intends to fly in the airspace of manned aircraft. It is implemented into Smart UAV which the flight test for autom...
详细信息
ISBN:
(纸本)9788993215045
Collision avoidance of UAV is an important function required from pilots and traffic controller as it intends to fly in the airspace of manned aircraft. It is implemented into Smart UAV which the flight test for automatic take-off, conversion and mission flight was conducted successfully last year. Prior to flight test for collision avoidance, the hardware-in-the-loop simulation (HILS) test is conducted in order to verify system operation and avoidance algorithm. Intruders are simulated through virtual aircraft models on the ground and transmitted to digital flight control computer (DFCC). The detection and avoidance algorithm is implemented to the operational flight program (OFP) in DFCC. This paper gives the description for the configuration of collision avoidance system, HILS system and the result for the simulation test in the case of multiple intruders.
Tradespace Exploration (TSE) provides decision-makers an understanding of capabilities, gaps, and potential compromises facilitating the achievement of product/ system metric objectives across the operating environmen...
详细信息
ISBN:
(数字)9781624105982
ISBN:
(纸本)9781624105982
Tradespace Exploration (TSE) provides decision-makers an understanding of capabilities, gaps, and potential compromises facilitating the achievement of product/ system metric objectives across the operating environment. The Portfolio design selection method utilizes a combination of Modern Portfolio Theory (MPT) for assets allocation, Multi-Attribute Tradespace Exploration (MATE) for considering greater set of alternatives than select point designs and Epoch-Era Analysis (EEA) for comparing potential portfolio performance under uncertain and changing contexts. The classic financial framework of Modern Portfolio Theory (MPT) expounds the benefits of diversification and leverage. A fundamental element of MPT is "asset allocation", or the identification of potential asset classes which a portfolio designer desires to consider for inclusion in the portfolio. Efficient Frontier is a key concept of MPT that represents the best combination of assets within an investment portfolio. While in finance, these assets may be stocks, bonds, or cash, for national air force portfolios, these may include identifying fundamental categories of air asset classes to achieve the 'efficient frontier' in defensive and offensive capabilities with a desired level of strategic autonomy. The Multi-Attribute Tradespace Exploration (MATE), a conceptual design method developed at MIT, combines Multi-Attribute Utility Theory (MAUT) and Tradespace Exploration (TSE) to compare large numbers of candidate system designs using experimental designs to enumerate vectors of design variables that are evaluated by system performance models. The Epoch-Era Analysis (EEA) is a framework designed to clarify the effects of changing contexts over time on the perceived value of the system in a structured way. This paper presents a case study of Modern Combat Aircrafts (MCA) Portfolio design selection for Indian Air Force (IAF) under uncertain situational context through value-driven design and model-based tradespac
暂无评论