In a paper published last month on the Applied Dynamics System in SIAM Magazine, the authors Mark Levinberg, Bernd Kraopf, Chris Howcroft, and Simon Neild studied dynamically using a non-linear model aircraft landing gear. Fundamentally non-linear dynamic landing gear swing and ground interaction of the wheel.
Aircraft landing gear shimmy oscillations have long been a problem, and explained: "Their prediction and prevention are still a continuing challenge to landing gear design, author Chris Howcroft." The problem is that landing gear may be displayed in hundreds The yuan or so flights were expected to perform on the ground entry and landing exercises, but then suddenly the oscillations were just right.
Fortunately, the mathematical model provides a cost-effective way of studying the dynamics of the main landing gear (MLG) and identifying possible oscillations under various conditions. “Our work has clarified under what conditions swing oscillations may encounter the main landing gear of a representative midsize passenger aircraft. “We have identified different types of oscillatory oscillations to show where they occur,†Howcroft said.
"Having the right mathematical model is the real key," he added. "The actual test is very expensive, however, nonlinear analysis methods are very suitable to determine these difficult to find dynamics, and they may also be characterized by the shimmy characteristics to determine that the aircraft has actually been built before." The model can provide insights, only No aircraft operations, but also design features that can help adjust the best stability.
Aircraft landing gear aircraft support the weight during landing and ground operations. In addition to their wheels, there are landing gear damping devices, or "shock absorber props" that also have brakes, retraction mechanisms, controls, and structural solid gears attached to the aircraft.
"In the specific case of MLG, we have developed a non-linear fully parametric model that allows us to draw a description of how the parameters of a landing gear depend on its dynamic operating parameters, such as aircraft speed and loading. Say:" Howcroft. "Compared to the more traditional methods of performing a large number of simulations, this is a tracking solution and stable change parameters, implemented directly from the power system using advanced tools." In addition, other parameters can be incorporated into the model on a further path, such as Runway conditions or tire pressure, or physical effects, such as dynamic shock absorbers.
"Now is being introduced to non-linear modeling and analysis tools in industrial practice through a recently developed MATLAB toolbox," writes author Simon Neild, "it's exciting to see that we've let our team handle not only the landing gear The problem of vibration, but the aircraft ground exercises and the loss of airliners in flight control."
5.2:1 or 6.2:1high speed gear system Stainless steel Screw-in Handle for easy installation and removal
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| Gear Ratio |
5.2:1 6.2:1 |
| Bearings |
3+1 12+1 |
| ITEM | Gear Ratio | Ball Bearing | Line Capacity(mm/m;Lbs/yds)-Standard | Line Capacity(mm/m)-Shwallow | OWC |
| DSA1000 | 5.2:1 | 3+1BB-10+1BB | 0.18/205 0.20/170 0.25/100; 4/175 6/110 8/90 | 0.12/150 | Y |
| DSA2000 | 6.2:1/5.2:1 | 3+1BB-10+1BB | 0.20/245 0.23/180 0.28/115; 4/240 6/160 8/125 | 0.20/150 | Y |
| DSA3000 | 6.2:1/5.2:1 | 3+1BB-10+1BB | 0.28/155 0.31/125 0.36/95; 8/180 10/150 12/110 | 0.22/150 | Y |
| DSA4000 | 6.2:1/5.2:1 | 3+1BB-10+1BB | 0.28/225 0.31/180 0.36/135; 8/270 10/220 12/160 | 0.24/150 | Y |
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