scholarly journals Nearly constant acceleration model for state estimation in the range‐Doppler plane

2021 ◽  
Author(s):  
Keyi Li ◽  
Zhengkun Guo ◽  
Gongjian Zhou
Keyword(s):  
State Estimation ◽  
Constant Acceleration ◽  
Acceleration Model

Smart-RTK: Multi-GNSS kinematic positioning approach on android smart devices with Doppler-smoothed-code filter and constant acceleration model

2019 ◽  
Vol 64 (9) ◽  
pp. 1662-1674 ◽  
Author(s):  
Kaishi Zhang ◽  
Wenhai Jiao ◽  
Liang Wang ◽  
Zishen Li ◽  
Jianwen Li ◽  
...  
Keyword(s):  
Smart Devices ◽  
Constant Acceleration ◽  
Kinematic Positioning ◽  
Acceleration Model

The CME arrival prediction with the Effective Acceleration Model: Further testing with heliospheric imaging observations

2021 ◽  
Author(s):  
Evangelos Paouris ◽  
Angelos Vourlidas ◽  
Athanasios Papaioannou ◽  
Anastasios Anastasiadis
Keyword(s):  
Interplanetary Medium ◽  
Field Of View ◽  
Time Of Arrival ◽  
Test Cases ◽  
Constant Acceleration ◽  
Acceleration Model ◽  
Open Issue ◽  
Mass Ejection ◽  
First Time ◽  
Ambient Solar Wind

<p>The estimation of the Coronal Mass Ejection (CME) arrival is an open issue in the field of Space Weather. Many models have been developed to predict Time-of-Arrival (ToA). In this work, we utilize an updated version of the Effective Acceleration Model (EAM) to calculate the ToA. The EAM predicts the ToA of the CME-driven shock and the sheath's average speed at 1 AU. The model assumes that the interaction between the ambient solar wind and the interplanetary CME (ICME) results in constant acceleration or deceleration. We recently compared EAM against ENLIL and drag based models (DBEM) with a sample of 16 CMEs. We confirmed the well-known fact that the deceleration of fast ICMEs in the interplanetary medium is not captured by most models. We study further the deceleration of fast ICMEs by introducing, for the first time, wide-angle observations by the STEREO heliospheric imagers into the EAM model. The speed profiles for some test cases show deceleration in the interplanetary medium at greater distances compared with the field-of-view of the coronagraphs.</p>

Research on the Motion Model of Flying Plate in Explosive Welding

2010 ◽  
Vol 108-111 ◽  
pp. 1152-1157
Author(s):  
Ming Lu ◽  
Liu Peng ◽  
Ling Li ◽  
Xin Wei Ji
Keyword(s):  
Explosive Welding ◽  
Maximum Speed ◽  
Metallic Materials ◽  
Motion Model ◽  
Experiment Data ◽  
Constant Acceleration ◽  
Acceleration Model ◽  
Calculated Curve ◽  
The Relationship ◽  
Good Agreement

Constant variably acceleration motion model of flying plate is proposed and the model formula about the relationship between speed of flying plate and clearance is put forward, which provides theorotical basis for choosing optimum clearance by collision speed of different metallic materials in explosive welding industry production. High pressure impulse X radial photograph experiment was carried out, the photos of the flying stances of flying plate in different clearances were obtained and the corresponding flying speeds of flying plate were calculated. Curve fitting of the experiment data through constant variably acceleration motion model was carried out. The results show that constant variably acceleration motion model accords well with the experiment data，and the maximum speed of flying plate calculated through constant acceleration model is in good agreement with the values through theoretical calculation. Therefore, it is concluded that the motion of flying plate in the main follows the constant variably acceleration motion.

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