A Prototype Two-Axis Hydraulic Actuator

1976 ◽  
Vol 190 (1) ◽  
pp. 245-254
Author(s):  
C.R. Burrows ◽  
T.P. Adams
Keyword(s):  
Experimental Tests ◽  
Design Analysis ◽  
Alternative Solution ◽  
Basic Design ◽  
Hydraulic Actuator ◽  
Simultaneous Rotation

In applications requiring simultaneous rotation about two orthogonal axes it is normal practice to employ some form of gimbal structure. An alternative solution is presented whereby the motion is obtained by a self contained two-axis hydraulic actuator. The design, analysis and manufacture of the device is discussed. Preliminary experimental tests have shown that the basic design of the device is sound. Some possible fields of application are suggested.

Real Time Loading Test Rig for Flight Control Actuators Under PHM Experimentation

2018 ◽  
Author(s):  
P. Chiavaroli ◽  
A. De Martin ◽  
G. Evangelista ◽  
G. Jacazio ◽  
M. Sorli
Keyword(s):  
Flight Control ◽  
Linear Models ◽  
Angular Position ◽  
Experimental Tests ◽  
Hydraulic Actuator ◽  
Loading Test ◽  
Pressure Transducers ◽  
Non Linear ◽  
Flight Controls ◽  
Servo Actuator

The article deals with the architecture, performance, and experimental tests of a test bench for servo-actuators used in flight controls. After the state of the art on the subject, the innovative architecture of the built bench is described, in which flight control actuator under test and load actuator are not in line but mounted perpendicularly. The model of the bench actuating systems is then presented, consisting of the servo-controlled hydraulic actuator, load cell, speed transducer, angular position transducer of the coupling and pressure transducers. For each of these components the nonlinear multi-physics mechatronic model is described, according to the adopted solutions. The adopted force control algorithm is discussed, showing the integrative compensation on the action line and proportional-derivative on the feedback, with speed feedforward. The experimental tests carried out on the bench under stalled conditions are also presented, whose results concerning time and frequency responses are compared with those obtained through the linearized and non-linear numerical model. Finally, the non-linear models of the flight control actuator under test, controlled in position, and of the loading servo-actuator of the bench are joined together, and the results of various simulations are described.

scholarly journals An Experimental Comparison of Two Exchange Economies: Long-Lived Asset vs. Short-Lived Asset

2021 ◽  
Author(s):  
Enrica Carbone ◽  
John Hey ◽  
Tibor Neugebauer
Keyword(s):  
Decision Analysis ◽  
Experimental Tests ◽  
Exchange Economy ◽  
Equilibrium Price ◽  
Consumption Smoothing ◽  
Alternative Solution ◽  
Experimental Comparison ◽  
Exchange Economies ◽  
Tree Model ◽  
One Step

The Lucas tree model [Lucas RE Jr (1978) Asset prices in an exchange economy. Econometrica 46(6):1429–1445.] lies at the heart of modern macrofinance. At its core, it provides an analysis of the equilibrium price of a long-lived asset in an exchange economy where consumption is the objective and the sole purpose of the asset is to smooth consumption through time. Experimental tests of the model use a particular instantiation of the Lucas model. Here we adopt a different instantiation to the first two, extending their analyses from a two-period oscillating world to a three-period cyclical world; this is partly to test the robustness of their results. We also go one step further and compare this solution (to a consumption-smoothing problem), in which consumption claims are traded via the long-lived asset, with the alternative solution provided by a market, in which agents can directly trade (short-lived) consumption claims between periods. We find that the latter exchange economy is more efficient in encouraging consumption smoothing than the economy with the long-lived asset. We find evidence of uncompetitive trading in both markets. This paper was accepted by Yan Chen, decision analysis.

Randomized Experimental Tests of Mediation Models

2011 ◽  
Author(s):  
Charles E. Lance ◽  
Richard P. DeShon ◽  
Eugene Stone-Romero
Keyword(s):  
Experimental Tests ◽  
Mediation Models
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