scholarly journals Development of Shock Spectra for Different Pulse Shapes Using C Sharp

10.29007/6rgn ◽  
2018 ◽  
Author(s):  
Manav Patel ◽  
Vijay R. Panchal
Keyword(s):  
Differential Equation ◽  
Software Tool ◽  
Sine Wave ◽  
Pulse Excitation ◽  
Paper Study ◽  
Wave Pulse ◽  
Triangular Pulse ◽  
Impulse Excitation ◽  
Differential Equation Method ◽  
Trapezoidal Pulse

In this paper, study is carried out to develop the shock spectra for different impulse excitation. To evaluate the effect of damping on various shock spectra, SDOF Systems have been considered. Piece-wise differential equation method is used to evaluate the response of the systems. 0%, 5%, 10% and 20% damping ratios are considered for four different pulse excitation namely - First half triangular pulse, Second half triangular pulse, Full cycle sine wave pulse, Trapezoidal pulse. Software tool is developed to generate different shock spectra using C Sharp.

scholarly journals Design of a New Acoustic Logging While Drilling Tool

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4385
Author(s):  
Kai Zhang ◽  
Baohai Tan ◽  
Wenxiu Zhang ◽  
Yuntao Sun ◽  
Jian Zheng ◽  
...  
Keyword(s):  
Impedance Matching ◽  
Sine Wave ◽  
Azimuthal Anisotropy ◽  
Dipole Source ◽  
Pulse Excitation ◽  
Drilling Tool ◽  
Overall Design ◽  
Logging While Drilling ◽  
Physical Construction ◽  
Exciting Wave

To obtain qualified logging while drilling (LWD) data, a new acoustic LWD tool was designed. Its overall design is introduced here, including the physical construction, electronic structure, and operation flowchart. Thereafter, core technologies adopted in this tool are presented, such as dominant exciting wave bands of dipole source, a sine wave pulse excitation circuit, broadband impedance matching, and an intellectualized active reception transducer. Lastly, we tested this tool in the azimuthal anisotropy module well, calibration well, and normal well, working in the model of the cable, sliding eye, and logging while drilling. Experiments showed that the core technologies achieved ideal results and that the LWD tool obtained qualified data.

The Dynamic Response of a Simple Elastic System to Antisymmetric Forcing Functions Characteristic of Airplanes in Unsymmetric Landing Impact

1949 ◽  
Vol 16 (3) ◽  
pp. 310-316
Author(s):  
Joseph B. Woodson
Keyword(s):  
Dynamic Response ◽  
Sine Wave ◽  
Response Curves ◽  
Response Factors ◽  
Natural Period ◽  
Wave Pulse ◽  
Pulse Disturbance ◽  
Landing Impact ◽  
Forcing Functions ◽  
The Difference

Abstract This paper presents an analysis of the dynamic response of an undamped mechanical system with one degree of freedom subjected to disturbances which are described by antisymmetric forcing functions. The analysis was undertaken to throw light on the effect on the vibration of the wings caused by unsymmetric landing impact of an airplane. Two types of disturbances are considered; a full-sine-wave pulse, and a pulse which is the difference between two overlapping half sine waves. The results are presented in the form of dynamic-response curves and dynamic-response-factor curves. The numerically greatest dynamic-response factors, approximately 3.24 and −3.26, resulted for a full-sine-wave pulse disturbance with a ratio of duration of impact to natural period, Ti/T ≅ 1.11. When Ti/T is in the neighborhood of 1, the first positive peak of dynamic response is numerically less than the negative and positive peaks which follow it. For much of the range, the positive and negative dynamic-response factors are numerically approximately equal. The analysis was confined to values of Ti/T between 0.33 and 12. As Ti/T increases without limit, the positive and negative dynamic-response factors tend to 1 and −1, respectively.

Surface Reconstruction From Triple Dexel Model for Virtual Sculpting

2007 ◽  
Author(s):  
Weihan Zhang ◽  
Ming C. Leu
Keyword(s):  
Differential Equation ◽  
Surface Reconstruction ◽  
Boundary Surface ◽  
Solid Modeling ◽  
Haptic Interface ◽  
Solid Model ◽  
Virtual Sculpting ◽  
Novel Method ◽  
Swept Volume ◽  
Differential Equation Method

This paper presents a novel method for surface reconstruction from triple dexel data for virtual sculpting. A triple dexel based virtual sculpting system is developed to provide the capability of interactive solid modeling with haptic interface. A solid model is converted to triple dexel data, which depicts the intersections of the solid with rays cast in three orthogonal directions, and modified during the virtual sculpting process. The boundary of the tool swept volume is computed based on the Sweep Differential Equation method. Contour generation and combination algorithms convert the triple dexel data to three sets of orthogonal slices of contours. A tiling algorithm then generates the solid’s boundary surface in triangular facets from these contours. Examples are given to demonstrate the ability of the developed method and software to realistically simulate the physical sculpting process and to allow viewing the sculpted models in any directions.

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