Reasonable Overburden Depth Analysis of Close-Frame Structure in Airport Project

2014 ◽  
Vol 501-504 ◽  
pp. 1140-1143
Author(s):  
Qi Jie Teng ◽  
Song Hua Wu ◽  
Liang Zhang
Keyword(s):  
Structural Design ◽  
Soil Depth ◽  
Load Capacity ◽  
Longitudinal Section ◽  
Structure Type ◽  
Frame Structure ◽  
Heavy Load ◽  
Depth Analysis ◽  
Engineering Significance ◽  
Underground Passage

The close-frame is the main structure type of underground passage in airport project. Its characteristics are long route, multi-zone crossing, heavy load capacity. The suitable thickness of covering soil is advantageous to structure. Therefore, it has important engineering significance in guiding structural design and to determine the optimal route longitudinal section with reasonable economic overburden depth. Double-span close frame bearing Class E aircraft load is discussed in detail about reasonable soil depth.

Solid Finite Element Analysis on close Frame of Airport Project

2015 ◽  
Vol 744-746 ◽  
pp. 860-863
Author(s):  
Qi Jie Teng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Design ◽  
Load Capacity ◽  
Structure Type ◽  
Element Analysis ◽  
Heavy Load ◽  
Main Structure ◽  
Engineering Significance ◽  
Underground Passage

The close-frame is the main structure type of underground passage in airport project. Its characteristics are long route, multi-zone crossing, heavy load capacity. The suitable calculation method is a key issue to simulate the force of structure. Single-span close frame bearing Class A380F aircraft load is discussed in detail about stress and moment by solid finite element analysis. Therefore, it has important engineering significance in guiding structural design.

Research on Load-Bearing Characteristics of Precision Air-Bearing Rotary Stage

2012 ◽  
Vol 479-481 ◽  
pp. 2129-2134
Author(s):  
Jie Qiong Lin ◽  
Lei Wang ◽  
Ming Hui Gao ◽  
Tong Huan Ran
Keyword(s):  
High Precision ◽  
Structural Design ◽  
Load Capacity ◽  
Air Bearing ◽  
Direct Drive ◽  
Ansys Software ◽  
Heavy Load ◽  
Rotary Stage ◽  
Low Load ◽  
Fluent Software

Air-bearing is a core component of air-bearing rotary stage. The weakness that the air-bearing has the low load capacity and stiffness has been concerned about by domestic and foreign scholars. So how to improve the load capacity and stiffness has become a serious problem. In order to improve the load capacity and stiffness of the air-bearing rotary stage, in this paper, we improved structure of Zhang Wenjie and others’ high-precision direct-drive air-bearing rotary stage. The gas film of air-bearing has been meshed by GAMBIT software, and we use FLUENT software to obtain the carrying capacity features of the gas film. Finally, the structural static force of the precision air-bearing rotary stage will be analyzed by ANSYS software. The analysis results show that: the structural design of the precision air-bearing rotary stage is reasonable, and this structure can provide a larger range of loads. Even in heavy load conditions, a larger deformation will not occur any more. It has a good practical value, and also can be widely used in high precision equipments.

scholarly journals Structure Analysis and Design of Automobile plastic clutch pump body based on friction welding

2020 ◽  
Vol 316 ◽  
pp. 02001
Author(s):  
Jing Sheng ◽  
Aamir Sohail ◽  
Mengguang Wang ◽  
Zhimin Wang
Keyword(s):  
High Temperature ◽  
Structural Design ◽  
Friction Welding ◽  
Room Temperature ◽  
Welding Process ◽  
Structure Type ◽  
Mechanical Analysis ◽  
Analysis And Design ◽  
Technical Requirements ◽  
Design Requirements

In order to realize the need for lightweight automobiles through replacing steel with plastics, the research and development of the plastic clutch pump body based on the friction welding was carried out. For the clutch pump body connected by friction welding process between the upper pump body and the lower pump body, the technical requirements of pressure 14 MPa and durability (high temperature 7.0 × 104 times, room temperature 7.0 × 105) are required. The structure type of the upper and lower pump bodies of the end face welding type was proposed. Through the static analysis of the pump body and weld and the mechanical analysis under the working condition, the structure of the clutch pump body (upper and lower pump body) was determined. According to the established welding process, the pressure of the clutch pump body is more than 15 MPa, and the number of high-temperature durable circulation and the number of room temperature durable circulation also reached 7.2×104 and 7.3×105 times respectively. The results show that the structural design of a clutch pump body meets the design requirements.

Study of the Influence of the Beam-Column Line Stiffness Ratio on the Frame Structure Load Capacity Based on MATLAB

2011 ◽  
Vol 71-78 ◽  
pp. 4194-4198
Author(s):  
Shao Qin Zhang ◽  
Hua Hu Cheng
Keyword(s):  
Engineering Design ◽  
Carrying Capacity ◽  
Calculated Result ◽  
Load Capacity ◽  
Frame Structure ◽  
Stiffness Ratio ◽  
Displacement Method ◽  
Structure Form ◽  
The Matrix ◽  
Internal Forces

Statically indeterminate frame, composed of beams and columns, is a widely used structure form in civil engineering. The frame carrying capacity under various actions is related to the absolute stiffness of frame components and relative beam-column line stiffness ratio. The matrix displacement method and programming based on MATLAB were employed in this study to calculate the internal forces and displacements of a 2-bay 2-story frame structure under the action of horizontal loads. The influence of the beam-column line stiffness ratio on the frame load capacity was discussed based on the calculated result. Furthermore some advises were provided about the reasonable beam-column line stiffness ratio for engineering design.

scholarly journals Recommendations for repairing the facades of the factory building of the “Experienced sports equipment in Moscow”

2018 ◽  
Vol 193 ◽  
pp. 03008
Author(s):  
Victor Kamskov
Keyword(s):  
Structural Design ◽  
Vertical Surface ◽  
Initial Information ◽  
Horizontal Orientation ◽  
Wall Structures ◽  
Depth Analysis ◽  
Building Wall ◽  
Building Walls ◽  
Instrumental Methods ◽  
Factory Building

The article presents the results of performed visual and instrumental surveys that allow to clarify and expand information on the structural design of the walls of the building, the nature of the damage and the cause of their origin. In order to obtain a more complete initial information on the surveyed object, visual and instrumental surveys were additionally carried out to clarify and expand information on the structural design of the building walls, the nature of the damage and the cause of their origin. Project-technical, executive and acceptance documentation for construction, as well as acts of survey of hidden works on the site are absent. By instrumental methods it is established that there is a gap between the surface of the main wall and the facing brick layer and the deviation of the facing layer from the vertical surface. As a result of inspection of the opened window slopes, it is established that the mesh protruding from the main masonry does not enter the lining seams but is bent into the gap. Therefore, the facing layer of masonry, which is devoid of connection with the main wall, operates independently as a self-supporting wall. Therefore, it is necessary to fix the facing layer to the laying of the main wall with steel ties. Examination of the facing of the facing layer revealed the presence of damage in the form of cracks having a vertical and horizontal orientation. Based on the results of the survey, recommendations were developed to ensure reliable and safe operation of the building wall structures in close connection with an in-depth analysis of the causes of these damages.

scholarly journals Dynamic Modelling and Analysis of the Microsegment Gear

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Yangshou Xiong ◽  
Kang Huang ◽  
Tao Wang ◽  
Qi Chen ◽  
Rui Xu
Keyword(s):  
High Speed ◽  
Load Capacity ◽  
Dynamic Performance ◽  
Dynamic Modelling ◽  
Weight Ratio ◽  
Load Condition ◽  
Main Idea ◽  
Heavy Load ◽  
Rotating Speed ◽  
Involute Gear

The development of technology requires higher load capacity, rotating speed, power-weight ratio, lower vibration, and noise with respect to the gear transmission. The new type microsegment gear’s tooth profile curve is composed of many microsegments. Previous researches indicate that the microsegment gear has a good static performance, while the dynamic behavior of the microsegment gear has never been investigated. This paper will focus on the dynamic performance of the gear. The profile deviation between microsegment gear and involute gear is regarded as a displacement excitation in the proposed dynamic model. The numerical analysis for three cases is conducted and the results shows that, in low-speed and heavy-load, medium-speed and medium-load conditions, microsegment gear and involute gear both exhibit a good performance, while, in high-speed and heavy-load condition, microsegment gear has a better performance than that of involute gear. The influence of backlash on the dynamic performance is also studied. It is found that the variation of backlash does not change the type of motion, but the vibration amplitude and the stability of the motion are much affected. The main idea in this paper is supposed to provide a novel method for the precision grinding of the microsegment gear.

scholarly journals Research on Improved Equivalent Diagonal Strut Model for Masonry-Infilled RC Frame with Flexible Connection

2019 ◽  
Vol 2019 ◽  
pp. 1-18
Author(s):  
Guang Yang ◽  
Erfeng Zhao ◽  
Xiaoya Li ◽  
Emad Norouzzadeh Tochaei ◽  
Kan Kan ◽  
...  
Keyword(s):  
Simulation Method ◽  
Structure Type ◽  
Frame Structure ◽  
Rc Frame ◽  
Infill Wall ◽  
Artificial Fish Swarm Algorithm ◽  
Rc Frame Structure ◽  
Proposed Model ◽  
Seismic Design Code ◽  
Artificial Fish Swarm

The reinforced concrete (RC) frame with masonry infill wall is one of the most common structural systems in many countries. It has been widely recognized that the infill wall has significant effects on the seismic performance of RC frame structure. During the Wenchuan earthquake (China 2008), a lot of infilled RC frame structures suffered serious damages due to the detrimental effects brought about by the infill wall rigidly connected to the surrounding frame. In order to solve this problem, flexible connection, introduced by Chinese designers, is recommended by the updated Chinese seismic design code, because of its effect to reduce the unfavorable interaction between infill wall and frame. Although infilled RC frame structure with flexible connection has a lot of advantages, but because of the lack of research, this structure type is seldom used in practical engineering. Therefore, it is of great significance to scientifically investigate and analyze the effects of flexible connection on structure behaviors of infilled RC frame. In this study, a macrofinite element numerical simulation method for infilled RC frame with flexible connection was investigated. Firstly, the effects of connection between infill wall and surrounding frame on in-plane behaviors of infilled RC frame were discussed. Secondly, based on deeply studying the equivalent diagonal strut models for infilled RC frame with rigid connection, an improved equivalent diagonal strut model for infilled RC frame with flexible connection was proposed. Employed with inversion analysis theory, the parameter in the proposed model was estimated through artificial fish swarm algorithm. Finally, applied with the existing experiment results, a case study was conducted to verify the effectiveness and feasibility of the proposed model.

Design of Mould on Cold Rolling for CARB Bearing’s Arc Roller

2012 ◽  
Vol 424-425 ◽  
pp. 838-843
Author(s):  
Luo Ping Zhang ◽  
Bo Ma ◽  
Jing Fu
Keyword(s):  
Cold Rolling ◽  
Structural Design ◽  
Manufacturing Industry ◽  
Load Capacity ◽  
Roller Bearing ◽  
Temperature Stability ◽  
Radial Load ◽  
High Temperature Stability ◽  
Bearing Life ◽  
Rolling Technology

CARB bearing is a kind of compact aligning roller bearing with internal contact and slightly curved surface, which is the most important breakthrough of bearing technology in rencent 50 years. CARB bearing’s special structural design make it has unique advantages, for example, reducing the mechanical structure size, reducing cost, extending bearing life, reducing noise, improving radial load capacity and high temperature stability, etc, so it is widely used in the manufacturing industry. CARB bearing’s roller is cylinder with arc, this unique structure is suitable for adopting cold rolling technology

Design of an Improved Nonlinear Disc Spring Vibration Isolator

2016 ◽  
Vol 835 ◽  
pp. 643-648
Author(s):  
Jia Fang ◽  
Huang Dong
Keyword(s):  
Vibration Isolation ◽  
Static Load ◽  
Load Capacity ◽  
Hysteresis Curve ◽  
Mechanical Equipment ◽  
Vibration Isolator ◽  
Element Analysis ◽  
Heavy Load ◽  
New Type ◽  
Disc Spring

An improved nonlinear vibration isolator is proposed in this paper. It uses the exact solution derived load-displacement hysteresis curve formula based on energy method to calculate disc spring, combined with the finite element analysis. The static load capacity and dynamic mechanical property of this new type disc spring vibration isolator is validated through the static load tests or fatigue analysis. Compared with the rubber vibration isolator, the conclusion can be found: the new type vibration isolator has wider scope of vibration isolation, and is better in low frequency vibration isolation. These research achievements are of significant importance in the vibration isolation of heavy load and great shock mechanical equipment.

Design of Input Shaping Control for Planar Parallel Manipulators

2013 ◽  
Author(s):  
Madusudanan Sathia Narayanan ◽  
Venkat Krovi
Keyword(s):  
Structural Design ◽  
High Speed ◽  
Dynamic Models ◽  
Damping Ratio ◽  
Parallel Manipulators ◽  
Mobile Manipulators ◽  
Heavy Load ◽  
End Effector ◽  
Input Shaping Control ◽  
Basic Input

Parallel manipulators are well known for their superior stiffness, higher accuracy, lower inertia and faster response compared to the serial counterparts and hence is widely used for high-speed machining and heavy load applications. However, controller limitations as well as design constraints can result in un-optimized designs causing unsettling residual vibrations at the end effector and limit their applications. Though many have discussed improving the structural design, augmenting with redundant sensors/ dampers and advanced feedback control methods for serial and mobile manipulators for vibration attenuations, very few investigated such techniques for parallel manipulators (PM). In this manuscript, we evaluate a specific type of feed-forward technique for planar PM. Lagrangian based dynamic models of platform manipulators and a simple trajectory level proportional-derivative control will be used with the gains tuned to force oscillations at the end effector to ensure stability. We will then demonstrate the applicability of basic input shapers for PM based on computation of natural frequencies and damping ratio for each mode, and resulting improvements in terms of appropriate performance measures.

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