scholarly journals Influence of External Factors on Airborne Missile’s Horizontal Backward Launching

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xiao Pan ◽  
Yi Jiang ◽  
Dong Hu ◽  
Huihui Guan
Keyword(s):  
Finite Element ◽  
Rigid Body ◽  
Pitch Angle ◽  
Random Vibration ◽  
Element Model ◽  
Body Model ◽  
Ejection Force ◽  
Ejection Process ◽  
Rigid Body Model ◽  
The Finite Element Model

This paper studies the influence of different external disturbance factors on the horizontal backward separation of airborne missiles on large transport aircraft. The method of comparison with experiment was adopted to verify the accuracy of the finite element model during the ejection process. By comparing the finite element model, it was confirmed that the all rigid body model and partly rigid body model are inaccurate in calculating the pitch angle and pitch velocity of the missile separation. Finally, the influences of ejection force, random vibration, and missile loading position on the ejection process are analyzed. The analysis found that the ejection force and the sliding distance will increase the vibration of the launching platform, therefore increase the separation pitch angle and the pitch velocity of the missile, but the influence of random vibration on platform is much greater than the other two factors, and it will also introduce randomness into the movement of the missile.

Vehicle Chassis/Suspension Dynamics Analysis - Finite Element Model vs. Rigid Body Model

1998 ◽  
Author(s):  
Yuan Zhang ◽  
Paul Xiao ◽  
Tim Palmer ◽  
Akbar Farahani
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Rigid Body ◽  
Element Model ◽  
Dynamics Analysis ◽  
Body Model ◽  
Rigid Body Model ◽  
Suspension Dynamics ◽  
Vehicle Chassis

Coupled-Field Analysis of the Compliant Slider Mechanism with Rectangle Flexure Hinges Based on ANSYS

2011 ◽  
Vol 189-193 ◽  
pp. 1897-1900
Author(s):  
Lei Duan ◽  
Li Fang Qiu ◽  
Hai Shan Weng ◽  
Zhi Yong Xie
Keyword(s):  
Finite Element ◽  
Rigid Body ◽  
Element Model ◽  
Field Analysis ◽  
Flexure Hinges ◽  
Body Model ◽  
Coupled Field ◽  
Rigid Body Model ◽  
Relationship Of ◽  
The Relationship

The compliant slider mechanism with rectangle flexure hinges was designed, and its pseudo-rigid-body model was built. The theoretical value of the relationship between force and displacement was given after analysis; the electrostatic-structural-coupled field finite element model of this mechanism was also built and analyzed by ANSYS, and the simulation value of the relationship between voltage and displacement was obtained; According to the relationship of voltage and force, the theoretical value was compared with the simulation value. The result indicates that the model is valid and the analysis is correct.

Random Vibration Analysis of a Printed Wiring Board with Electronic Components

1991 ◽  
Vol 34 (1) ◽  
pp. 25-31
Author(s):  
Jack Roberts ◽  
Debra Stillo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Random Vibration ◽  
Element Model ◽  
Printed Wiring Board ◽  
Electronic Components ◽  
Bending Stresses ◽  
Wiring Board ◽  
Element Technique ◽  
The Finite Element Model

A printed wiring board (PWB) with electronic components has been modeled using the finite element technique and compared with the same PWB experimentally tested in a chassis during a 2 hr random vibration test. Accelerometers were attached to the PWB in locations where nodes existed in the finite element model (FEM). The FEM predicted the first natural frequency to within 10 percent of the test results. Due to wedge locks that loosened during the test, the PWB accelerations in the finite element model and the test differed by as much as 40 percent. The ceramic capacitor on the PWB was modeled in detail with leads attached to the PWB to examine bending stresses in the leads. During the 2 hr test there were no failures for those leads with adequate solder joints. A failure did occur, however, on a lead with insufficient solder. A fatigue analysis of the FEM lead bending stresses indicated lead failure if no solder was used, whereas no failures were predicted for properly soldered leads.

A Family of Butterfly Flexural Joints: Q-LITF Pivots

2011 ◽  
Author(s):  
Xu Pei ◽  
Jingjun Yu ◽  
Shusheng Bi ◽  
Guanghua Zong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rigid Body ◽  
Rigid Bodies ◽  
The Other ◽  
Element Analysis ◽  
Leaf Type ◽  
Center Shift ◽  
Body Model ◽  
Rigid Body Model

The Leaf-type Isosceles-Trapezoidal Flexural (LITF) pivot consists of two compliant beams and two rigid-bodies. For a single LITF pivot, the range of motion is small while the center-shift is relatively large. The capability of performance can be improved greatly by the combination of four LITF pivots. Base on the pseudo-rigid-body model (PRBM) of a LITF pivot, a method to construct the Quadri-LITF pivots is presented by regarding a single LITF pivot (or double-LITF pivot) as a the configurable flexure module. Ten types of Q-LITF pivots are synthesized. Compared with the single LIFT pivot, the stroke becomes larger, and stiffness becomes smaller. Four of them have the increased center-shift. The other four have the decreased center-shift. One of the quadruple LITF pivots is selected as the examples to explain the proposed method. The comparison between PRBM and Finite Element Analysis (FEA) result shows the validity and effectiveness of the method.

Imitative Farmland Random Vibration Analysis on Frame of Blueberry Harvesters

2011 ◽  
Vol 189-193 ◽  
pp. 2421-2425
Author(s):  
Qian Wang ◽  
Zhi Peng Li ◽  
Wei Jia Chen ◽  
Tao Peng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
White Noise ◽  
Vibration Analysis ◽  
Random Vibration ◽  
Element Model ◽  
Ansys Software ◽  
The Finite Element Model ◽  
Random Vibration Analysis

This paper uses MATLAB Simlink module to simulate road spectrum of the blueberries farmland where blueberry harvesters are running, and gets white noise random road displacements. On the basis of ANSYS software, the finite element model of frame of blueberry harvesters is established to carry out imitative farmland random vibration analysis. According to the results from random vibration analysis, improves the structure of frame of blueberry harvesters.

Influence of tire blowout on the collision of a light pickup truck with a guardrail safety barrier

2019 ◽  
Vol 234 (6) ◽  
pp. 1714-1724
Author(s):  
Abdelmonaam Sassi ◽  
Sadok Sassi ◽  
Faris Tarlochan
Keyword(s):  
Finite Element ◽  
Pitch Angle ◽  
Dynamic Test ◽  
Element Model ◽  
Pickup Truck ◽  
Element Simulation ◽  
The Stability ◽  
Left Front ◽  
Yaw Angle ◽  
The Finite Element Model

This main purpose of this work is to investigate, through a finite-element simulation, the effect of tire blowout on the collision of a light pickup truck with a guardrail, at a speed of 100 km/h. The finite-element model was calibrated against a dynamic test carried out by the Texas Transportation Institute. Four cases of individual tire blowout were considered. Among these, the case of the left front tire was found to be the most critical one, resulting in a pitch angle of 24°, a roll angle of 12°, and a yaw angle of 30°. For this critical case, the results showed that the deflated tire trapped in the guardrail, which created more interaction between the vehicle and the guardrail beam. These challenging crash conditions were found to be more crucial for the stability of the pickup compared with the fully inflated tire scenario.

Spatial-Beam Large-Deflection Equations and Pseudo-Rigid-Body Model for Axisymmetric Cantilever Beams

2011 ◽  
Author(s):  
Issa A. Ramirez ◽  
Craig P. Lusk
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rigid Body ◽  
Three Dimensional ◽  
Vertical Axis ◽  
Analysis Model ◽  
Element Analysis ◽  
Body Model ◽  
Straight Beam ◽  
Rigid Body Model

The kinematic equations for approximating the deflection of a three-dimensional cantilever beam were developed. The numerical equations were validated with a Finite Element Analysis program. With these equations, a pseudo-rigid-body model (PRBM) for an axisymmetric straight beam was developed. The axisymmetric PRBM consists of a spherical joint connecting two rigid links. The location of the deformed end of the beam is determined by two angles and the characteristic radius factor. The angle of the beam with respect to the vertical axis depends on the direction of the force with respect to the undeformed coordinate system. The Pearson’s correlation coefficient for the Finite Element Analysis model and the numerical integration is 0.952.

Study on Random Vibration Response Analysis for the Sphere Cylinder Assembly in Aerospace Vehicle

2014 ◽  
Vol 680 ◽  
pp. 258-262
Author(s):  
De Lin Sun ◽  
Zhe Zhao ◽  
Kun He ◽  
Ri Dong Liao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Basic Principle ◽  
Random Vibration ◽  
Structural Strength ◽  
Element Model ◽  
Vibration Response ◽  
Response Analysis ◽  
Vibration Load ◽  
The Finite Element Model

To assess the structural strength of spherical cylinder, the finite element model was constructed by the NX NASTRAN software. Firstly,the basic principle of random vibration response analysis was introduced, then the random vibration response analysis of the cylinder assembly was analyzed. The simulation result shows that the stress of the joint between spherical cylinder clamp and the base is larger than other areas in conditions of a given random vibration load. The spherical cylinder structure is safe and that the maximum RMS stress is about 20 MPa.

scholarly journals Study on Initial Disturbance of Airborne Missile’s Horizontal Backward Derailment under Continuous Gust

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Xiao Pan ◽  
Yi Jiang ◽  
Xinlin Wei ◽  
Mingjun Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Pitch Angle ◽  
Element Model ◽  
Initial Disturbance ◽  
Calculation Methods ◽  
Transport Aircraft ◽  
Separation Time ◽  
The Finite Element Model

This paper studies the effect of continuous gusts on the initial disturbance of the airborne missile’s horizontal backward derailment on large transport aircraft. The longitudinal fluctuation of the airborne launching platform under continuous gust was obtained with different calculation methods, and the finite element model of the derailing process was established then verified by experiments. Finally, combined with the longitudinal fluctuation of the launching platform and the finite element model of the missile and launching platform, the influence of platform fluctuation on separation time, missile speed, pitch angle, and descending distance while derailing was studied and analyzed. It is found that the longitudinal fluctuation of the launching platform is similar to that of the gust but lags behind, and the missiles under the fluctuating platform have longer separation time, lower derailing speed, and greater derailing pitch angle and descending distance.

A Pseudo-Rigid Body Model for Compliant Edge Panels in Origami-Inspired Mechanisms

2016 ◽  
Author(s):  
Alden Yellowhorse ◽  
Larry L. Howell
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rigid Body ◽  
Element Analysis ◽  
Design Problems ◽  
Body Model ◽  
Rigid Body Model ◽  
Potential Applications

Origami-inspired mechanisms have a variety of potential applications but present many challenges in their design. Problems such as mechanism inflexibility must be considered for any application but may not always be easily resolvable. One option in such a case would be to rely on the inherent flexibility of the origami panels to permit motion. This paper presents a method for increasing the flexibility of a structure and enabling motion in an otherwise immobile origami-inspired mechanism. This method will be derived analytically and then verified through finite-element analysis and experiments.

Sign in / Sign up

Export Citation Format

Share Document