Safety Design of Ammunition Screw Dismantlement Based on Temperature Control

2011 ◽  
Vol 311-313 ◽  
pp. 1195-1198
Author(s):  
Zhi Zhang ◽  
Da Wei Zhang ◽  
Jing Sheng Cheng
Keyword(s):  
Temperature Control ◽  
Axial Force ◽  
Design Method ◽  
Influential Factors ◽  
Limited Temperature ◽  
Safety Design ◽  
Screw Joint ◽  
Resistant Moment ◽  
Main Factor

Safety is very important in the dismantlement of screw-joint ammunition parts. The main factor which influences the safety is the temperature of screw area during the process of dismantlement. The design method based on temperature control is studied in the paper. Influential factors including resistant moment, axial force and dismantlement speed are analyzed. The dismantlement speed can be control to satisfy the safety design. The method and steps of the safety design is put forward which aims to control danger limited temperature.

Incorporation of Endurance Limit in the Mechanistic-Empirical Flexible Perpetual Pavement Design

2018 ◽  
Vol 2672 (40) ◽  
pp. 108-121 ◽  
Author(s):  
Sheng Hu ◽  
Sang-Ick Lee ◽  
Lubinda F. Walubita ◽  
Fujie Zhou ◽  
Tom Scullion
Keyword(s):  
Endurance Limit ◽  
Design Method ◽  
Field Performance ◽  
Fatigue Cracking ◽  
Climatic Conditions ◽  
Influential Factors ◽  
Pavement Design ◽  
Design System ◽  
Viscoelastic Continuum Damage ◽  
Perpetual Pavement

In recent years, there has been a push toward designing long-lasting thick hot mix asphalt (HMA) pavements, commonly referred to as a perpetual pavements (PP). For these pavements, it is expected that bottom-up fatigue cracking does not occur if the strain level is below a certain limit that is called the HMA fatigue endurance limit (EL). This paper proposed a mechanistic-empirical PP design method based on this EL concept. The ELs of 12 HMA mixtures were determined using simplified viscoelastic continuum damage testing and the influential factors were comparatively investigated. It was found that HMA mixtures seem to have different EL values based on mix type and test temperatures. There is not just a single EL value that can be used for all mixtures. Thus, default EL criteria for different mixtures under different climatic conditions were developed and incorporated into the Texas Mechanistic-Empirical Flexible Pavement Design System (TxME). As a demonstration and case study, one Texas PP test section with weigh-in-motion traffic data was simulated by TxME. The corresponding TxME inputs/outputs in terms of the PP structure, material properties, traffic loading, environmental conditions, and ELs were demonstrated. The corresponding TxME modeling results were consistent with the actual observed field performance of the in-service PP section.

scholarly journals Structure design and reliability analysis of Al-Ti lugs

2021 ◽  
Vol 39 (1) ◽  
pp. 1-8
Author(s):  
Yunwen Feng ◽  
Jiale Zhang ◽  
Xiaofeng Xue ◽  
Xiaoping Zhong ◽  
Wei Xie
Keyword(s):  
Reliability Analysis ◽  
Structural Design ◽  
Design Principle ◽  
Load Transfer ◽  
Design Method ◽  
Static Strength ◽  
Structure Design ◽  
Safety Design ◽  
Design Requirements ◽  
Metal Materials

Aircraft lug joint is the key part of load transfer. In order to improve the safety of lug joint, on the premise of meeting the design requirements of static strength and fatigue, the composite connection lug structure design technology of different metal materials is proposed in this paper. Firstly, the damage safety design and life reliability analysis of the lug structure are studied theoretically. Secondly, based on the concept of damage safety design and the design principle of deformation coordination, the design method of composite connection lug with deformation coordination is proposed, and the thickness ratio of single ear is 0.8:1:0.8. Finally, the reliability of the composite lug is analyzed. The results show that the structural design scheme of aluminum-titanium composite ear piece can meet the requirements of static strength and damage tolerance, and compared with the conventional ear structure, the failure probability of structure mission life is greatly reduced when the weight of the composite connection lug is only increased by 4.9%. The proposed method can effectively guide the structural design of composite ear piece.

scholarly journals A PILOT CASE STUDY OF A PERFORMANCE-BASED FIRE SAFETY DESIGN METHOD TO A MULTI-TENANT OFFICE BUILDING

1997 ◽  
Vol 3 (5) ◽  
pp. 138-141 ◽  
Author(s):  
Kawori KOYA ◽  
Yoshifumi OHMIYA ◽  
Kazunori HARADA ◽  
Takeyoshi TANAKA ◽  
Akihiko HOKUGO ◽  
...  
Keyword(s):  
Fire Safety ◽  
Design Method ◽  
Office Building ◽  
Safety Design ◽  
Fire Safety Design ◽  
A Performance

Temperature Control of Batch Reaction Based on Genetic Fuzzy Neural Network

2011 ◽  
Vol 204-210 ◽  
pp. 1968-1971 ◽  
Author(s):  
Chun Tao Man ◽  
Jia Cui ◽  
Xin Xin Yang ◽  
Jun Kai Wang ◽  
Tian Feng Wang
Keyword(s):  
Neural Network ◽  
Temperature Control ◽  
Fuzzy Neural Network ◽  
Control Method ◽  
Design Method ◽  
Batch Reactor ◽  
Batch Processes ◽  
Strong Nonlinearity ◽  
Control Scheme ◽  
Fuzzy Neural

The batch reactor has strong nonlinearity and hysteresis, the conventional control method is hard to meet the control requirements. According to the batch processes temperature control, this thesis proposed an intelligent control scheme. Combined neural networks with fuzzy logic control, searching and optimized parameters of fuzzy neural network by using Genetic Algorithm (GA), displayed the design method and optimization steps, and the simulation results verify the control scheme which proposed is feasible and effective.

Theoretical Optimum of Implant Positional Index Design

2009 ◽  
Vol 88 (8) ◽  
pp. 731-735 ◽  
Author(s):  
W. Semper ◽  
S. Kraft ◽  
T. Krüger ◽  
K. Nelson
Keyword(s):  
Analytical Calculation ◽  
Influential Factors ◽  
Joint Stability ◽  
Geometric Pattern ◽  
Positional Accuracy ◽  
Implant Abutment ◽  
Screw Joint ◽  
Manufacturing Tolerances ◽  
Rotational Freedom ◽  
Polygonal Profile

Rotational freedom of the implant-abutment connection influences its screw joint stability; for optimization, influential factors need to be evaluated based on a previously developed closed formula. The underlying hypothesis is that the manufacturing tolerances, geometric pattern, and dimensions of the index do not influence positional stability. We used the dimensions of 5 commonly used implant systems with a clearance of 20 μm to calculate the extent of rotational freedom; a 3D simulation (SolidWorks) validated the analytical findings. Polygonal positional indices showed the highest degrees of rotational freedom. The polygonal profile displayed higher positional stability than the polygons, but less positional accuracy than the cam-groove connection. Features of a maximal rotation-safe positional index were determined. The analytical calculation of rotational freedom of implant positional indices is possible. Rotational freedom is dependent on the geometric design of the index and may be decreased by incorporating specific aspects into the positional index design.

The Temperature Control System Design of Microchip Level PCR Instrument Based on SOPC

2013 ◽  
Vol 336-338 ◽  
pp. 1020-1027 ◽  
Author(s):  
Hong Hua Liao
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Temperature Sensor ◽  
Design Method ◽  
Copper Wire ◽  
Temperature Control System ◽  
Fuzzy Pid ◽  
Wire Temperature ◽  
Adaptive Fuzzy ◽  
Micro Pump

A design approach of the temperature control of a novel microchip level PCR instrument based on SOPC technique is presented in this paper. The soft-core processor with RISC framework, NIOS II, which embedded in the FPGA (CyclonIII EP3C16F484C6) of Altera corp., is used as the key component to control the PWM controller achieving the temperature control of the micro-chamber stationary microchip level PCR instrument, to control the Avalon stream slave peripheral acquiring controller achieving the temperature signal detection by the flexible snake like copper wire temperature sensor, and to control the micro-pump and the micro-valve achieving the sample injection and sample outflow controlling. Simultaneously, the control temperature algorithm based on the Smith predictive and adaptive Fuzzy-PID is adapted in this system. The design of PCR microchip, the Smith predictive adaptive Fuzzy-PID temperature control algorithm, the hardware framework and the software design of control system are mainly introduced. And the simulation results testified the correctness of the design method and practicability. Keywords: Microchip level PCR instrument; Smith predictive and adaptive Fuzzy-PID controller; SOPC; The flexible snake like copper wire temperature sensor

Three Dimensional Highway Real-Time Visual System Design and Application

2011 ◽  
Vol 467-469 ◽  
pp. 63-68
Author(s):  
Hai Feng Li ◽  
Xue Jun Xu ◽  
Xin Sha Fu
Keyword(s):  
Visual System ◽  
Real Time ◽  
Design Method ◽  
Three Dimensional ◽  
Safety Design ◽  
Physics Simulation ◽  
Fast Development ◽  
Increasing Demand ◽  
Highway Alignment ◽  
Highway System

With the fast development of the freeway construction in China and the increasing demand of the improvement of the landscape and safety in the highway system, the traditional method of the highway alignment design cannot meet the need mentioned above. A Three dimensional highway real-time visual system (3DHVS) is developed as a basic platform for the highway visual and physics simulate, which had many merit in the highway alignment, landscape and safety design by the means of fly-through, interactive and physics simulation with the virtual scene. By analyzing the disadvantage of the widely used design method, a performance and expansible architecture of 3DHVS is presented. Finally, we show the application of the system.

Internal Forces and Steel Arrangement Analysis on the Steel Lined Reinforced Concrete Penstocks

2011 ◽  
Vol 94-96 ◽  
pp. 99-104
Author(s):  
Zhang Wei ◽  
Chuan Xiong Fu ◽  
Lu Feng Yang ◽  
Jin Zhang
Keyword(s):  
Reinforced Concrete ◽  
Axial Force ◽  
Cross Sections ◽  
Design Method ◽  
Internal Force ◽  
Concrete Wall ◽  
Inner Radius ◽  
Load Carrying ◽  
Internal Forces ◽  
Axisymmetric Structure

he steel lined reinforced concrete penstocks (SLRCP) is always looked as an axisymmetric structure according to the design code, which can not show the true load-carrying capacity when considering the dam’s constraint to the SLRCP. In this paper, the physical non-axisymmetric property of the structure is simulated using the finite element method. The internal force distribution of every cross section in the SLRCP is studied, and a design method for steel arrangement based on axial force is proposed. When considering the non-axisymmetric property, the axial force in those cross sections approaching the bottom of the structure may be reduced more than 30% to the calculated value by the axisymmetric analysis. The larger the inner radius of the penstock or the thickness of the concrete wall is, the more marked the non-axisymmetric property of the SLRCP is.

Sign in / Sign up

Export Citation Format

Share Document