Study on the Application of Metal Rubber Isolator in Compressor Base

2010 ◽  
Vol 139-141 ◽  
pp. 2478-2481
Author(s):  
Hai Long Fu ◽  
Long Qing Zou ◽  
Guang Dai ◽  
Xu Chi
Keyword(s):  
Petrochemical Industry ◽  
Maximum Stress ◽  
Mechanical Equipment ◽  
Nonlinear Simulation ◽  
Isolation System ◽  
Finite Element Software ◽  
Wide Range ◽  
Simulation Calculation ◽  
Metal Rubber ◽  
Rubber Isolator

In this paper, the main problem is how to eliminate vibration came from the compressor base in petrochemical industry. The absolute transmissibility was calculated by building the compressor isolation system model. The spectrum information of compressor vibration was got through the vibration test, and the results can be acted as the condition for the isolator’s design. Isolators were designed with damping part connecting metal rubber with helical spring. Nonlinear simulation calculation was completed by finite element software. The results show that the maximum stress of isolator is about 494MPa and its maximum distortion is approximately 6mm. It verifies that the new-style isolator can satisfy vibration elimination of compressor. It is with wide-range rigidity and better capability of energy dissipation than that of general rubber isolator. It has a useful application and perspective on vibration elimination for the mechanical equipment in petrochemical industry.

scholarly journals Numerical Simulation of Failure Analysis of Storage Tank with Partition Plate and Structure Optimization

Mathematics ◽  
2021 ◽  
Vol 9 (24) ◽  
pp. 3230
Author(s):  
Wenxian Su ◽  
Xiao Feng
Keyword(s):  
Storage Tank ◽  
Petrochemical Industry ◽  
Maximum Stress ◽  
Structural Strength ◽  
Safety Performance ◽  
Storage Tanks ◽  
Finite Element Software ◽  
Theoretical Design ◽  
Economical Optimization ◽  
Tie Rods

Storage tanks with partition plates are widely used in the petrochemical industry. However, relevant standards do not propose corresponding design criteria and methods for this type of structure, and theoretical design formulas cannot be applied to ensure the reliability of its structure. Therefore, it is necessary to analyze and design the storage tank with a partition plate by using finite elements. This paper studies the problem of buckling depression and cracks in the welded parts of the S-shaped tank with a partition plate during its operation. We used the finite element software ANSYS to analyze the overall strength and stability of the structure and obtain the larger stress area. Based on this, a safe and economical optimization plan is proposed: under the condition of strictly controlling the liquid level difference on both sides of the partition, the tank structure is optimized by adding stiffeners and tie rods. The study revealed that the measure effectively improves the overall rigidity of the tank body and reduces the maximum stress of the structure and enhances the safety performance of storage tank. Additionally, it provides a reference for the structural strength design of storage tanks with partition plates.

scholarly journals Experimental Study and Simulation Calculation of the Chloride Resistance of Concrete under Multiple Factors

2021 ◽  
Vol 11 (12) ◽  
pp. 5322
Author(s):  
Yang Ding ◽  
Tong-Lin Yang ◽  
Hui Liu ◽  
Zhen Han ◽  
Shuang-Xi Zhou ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Penetration Depth ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Chloride Ions ◽  
Finite Element Software ◽  
Chloride Resistance ◽  
Simulation Calculation ◽  
Marine Concrete ◽  
Resistance Performance

Cement is widely used in marine concrete, and its resistance to chloride ion corrosion has been widely considered. In this paper, based on a laboratory test, the influence of different hydrostatic pressures, coarse aggregate contents and w/c ratios on the chloride resistance performance is analyzed. Based on COMSOL finite element software, a two-dimensional cementitious materials model is established, and the simulation results are compared with the experimental results. The results show that the penetration depth of chloride ions in cement increases with the increase of the w/c ratio. Under the hydrostatic pressure of 0 MPa, when the w/c ratio is 0.35, the penetration depth of chloride ions is 7.4 mm, and the simulation result is 8.0 mm. When the w/c ratio is 0.45, the penetration depth of chloride ions is 9.3 mm, and the simulation result is 9.9 mm. When the w/c ratio is 0.55, the penetration depth of chloride ions is 12.9 mm, and the simulation result is 12.1 mm. Under different hydrostatic pressures, the penetration depth of chloride ions obviously changes, and with the increase in hydrostatic pressure, the penetration depth of chloride ions deepens. Under the w/c ratio of 0.35, when the hydrostatic pressure is 0.5 MPa, the penetration depth of chloride ions is 11.3 mm, and the simulation result is 12.1 mm. When the hydrostatic pressure is 1.0 MPa, the penetration depth of chloride ions is 16.2 mm, and the simulation result is 17.5 mm.

A Calculation Method of Magnetic Anomaly Field Distribution of Ellipsoid with Arbitrary Posture

2021 ◽  
Author(s):  
Song-tong Han ◽  
Bo Zhang ◽  
Xiao-li Rong ◽  
Lei-xiang Bian ◽  
Guo-kai Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Finite Element ◽  
Magnetic Anomaly ◽  
Field Distribution ◽  
Calculation Method ◽  
Gravity Potential ◽  
Anomaly Field ◽  
Finite Element Software ◽  
Wide Range ◽  
Distribution Equation

The ellipsoidal magnetization model has a wide range of application scenarios. For example, in aviation magnetic field prospecting, mineral prospecting, seabed prospecting, and UXO (unexploded ordnance) detection. However, because the existing ellipsoid magnetization formula is relatively complicated, the detection model is usually replaced by a dipole. Such a model increases the error probability and poses a significant challenge for subsequent imaging and pattern recognition. Based on the distribution of ellipsoid gravity potential and magnetic potential, the magnetic anomaly field distribution equation generated by the ellipsoid is deduced by changing the aspect ratio, making the ellipsoid equivalent to a sphere. The result of formula derivation shows that the two magnetic anomaly fields are consistent. This paper uses COMSOL finite element software to model UXO, ellipsoids, and spheres and analyzes magnetic anomalies. The conclusion shows that the ellipsoid model can completely replace the UXO model when the error range of 1nT is satisfied. Finally, we established two sets of ellipsoids and calculated the magnetic anomalous field distributions on different planes using deduction formulas and finite element software. We compared the experimental results and found that the relative error of the two sets of data was within [Formula: see text]‰. Error analysis found that the error distribution is standardized and conforms to the normal distribution. The above mathematical analysis and finite element simulation prove that the calculation method is simple and reliable and provides a magnetic field distribution equation for subsequent UXO inversion.

Transition sets analysis based parametrical design of nonlinear metal rubber isolator

2017 ◽  
Vol 96 ◽  
pp. 93-105 ◽  
Author(s):  
Huijie Yu ◽  
Xiuting Sun ◽  
Jian Xu ◽  
Shu Zhang
Keyword(s):  
Metal Rubber ◽  
Parametrical Design ◽  
Rubber Isolator

A Study on the Restrainer for Isolated Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 5208-5213
Author(s):  
Yong Feng Du ◽  
Xiao Yu Sun
Keyword(s):  
Lateral Displacement ◽  
Time History ◽  
Nonlinear Characteristics ◽  
Isolation System ◽  
Finite Element Software ◽  
Continuous Beam Bridge ◽  
History Analysis ◽  
Isolated Bridge ◽  
Isolated Bridges ◽  
Beam Bridge

As a result of adopting isolated bearings, it is inevitable to increase the lateral displacement of the superstructure and the chance of girder falling. However, the shear keys that just satisfies the structural design is far from meeting the requirements of displacement of isolated bridge restrictions. On account of this, given the nonlinear characteristics of bearings and the restrainer, the authors make the study on the "damping rubber with coupling collar" restrainer, and then establish isolation system model of continuous beam bridge with finite element software named Midas. Meanwhile, the effect of the restrainer on the dynamic response of isolated bridges is presented by time-history analysis, which reveals the great value in the application of limiting displacement of isolated bridge.

scholarly journals Finite Element Software for Rubber Products Design

2018 ◽  
Vol 3 (1) ◽  
pp. 13-20
Author(s):  
Dávid Huri
Keyword(s):  
Finite Element ◽  
Complex Analysis ◽  
Large Deformations ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Material Models ◽  
Finite Element Software ◽  
Highly Nonlinear ◽  
Wide Range ◽  
Different Types

Automotive rubber products are subjected to large deformations during working conditions, they often contact with other parts and they show highly nonlinear material behavior. Using finite element software for complex analysis of rubber parts can be a good way, although it has to contain special modules. Different types of rubber materials require the curve fitting possibility and the wide range choice of the material models. It is also important to be able to describe the viscoelastic property and the hysteresis. The remeshing possibility can be a useful tool for large deformation and the working circumstances require the contact and self contact ability as well. This article compares some types of the finite element software available on the market based on the above mentioned features.

scholarly journals Low Cost Frictional Seismic Base-Isolation of Residential New Masonry Buildings in Developing Countries: A Small Masonry House Case Study

2017 ◽  
Vol 11 (1) ◽  
pp. 1026-1035 ◽  
Author(s):  
Ahmad Basshofi Habieb ◽  
Gabriele Milani ◽  
Tavio Tavio ◽  
Federico Milani
Keyword(s):  
Finite Element ◽  
Seismic Vulnerability ◽  
Base Isolation ◽  
Low Cost ◽  
Element Model ◽  
Shaking Table ◽  
Fe Model ◽  
Isolation System ◽  
Finite Element Software ◽  
Non Linear

Introduction:An advanced Finite Element model is presented to examine the performance of a low-cost friction based-isolation system in reducing the seismic vulnerability of low-class rural housings. This study, which is mainly numerical, adopts as benchmark an experimental investigation on a single story masonry system eventually isolated at the base and tested on a shaking table in India.Methods:Four friction isolation interfaces, namely, marble-marble, marble-high-density polyethylene, marble-rubber sheet, and marble-geosynthetic were involved. Those interfaces differ for the friction coefficient, which was experimentally obtained through the aforementioned research. The FE model adopted here is based on a macroscopic approach for masonry, which is assumed as an isotropic material exhibiting damage and softening. The Concrete damage plasticity (CDP) model, that is available in standard package of ABAQUS finite element software, is used to determine the non-linear behavior of the house under non-linear dynamic excitation.Results and Conclusion:The results of FE analyses show that the utilization of friction isolation systems could much decrease the acceleration response at roof level, with a very good agreement with the experimental data. It is also found that systems with marble-marble and marble-geosynthetic interfaces reduce the roof acceleration up to 50% comparing to the system without isolation. Another interesting result is that there was little damage appearing in systems with frictional isolation during numerical simulations. Meanwhile, a severe state of damage was clearly visible for the system without isolation.

Recent Developments in the Ironfounding Industry

1972 ◽  
Vol 186 (1) ◽  
pp. 149-168
Author(s):  
H. Morrogh
Keyword(s):  
Capital Investment ◽  
Production Efficiency ◽  
Cumulative Effect ◽  
Spheroidal Graphite ◽  
Mechanical Equipment ◽  
Cast Irons ◽  
Delivery Times ◽  
Iron Castings ◽  
Wide Range ◽  
Recent Developments

Iron castings are in extensive use throughout engineering construction and are available in a wide range of properties, casting size and complexity. Ironfounding is in part associated with a particular industry—the ironfounding industry—and is in part a production engineering technique adopted by firms, their designers and engineers, on the basis of its process and product merits compared with those of other techniques. The changing pattern of manufacture and competition from other techniques is having important influences on the structure and capacity of industry producing iron castings. Additionally, the repeated cycles of business recession may result in the disappearance of the facilities for the production of certain types of foundry product. Although most recent developments in ironfounding are a continuation of trends which could be discerned or forecast a long time ago, the cumulative effect of these changes has been to revolutionize completely some aspects of the process of iron casting. The range of cast irons has been somewhat increased in recent years by addition to the variety of spheroidal graphite (s.g.) irons, malleable irons and alloy cast irons available. Most of the recent developments in ironfounding have, however, been concerned with improving production efficiency and the introduction of new melting, moulding and coremaking processes, enabling the ironfounder to provide the engineer and designer with a better service—maintaining prices at low level, improving dimensional accuracy and casting soundness with reduced delivery times. This has been achieved by the increased use of scrap made possible by developments in melting furnaces and molten metal treatment, by the introduction of new and improved moulding machinery and by the adoption of new methods of bonding sand used for moulds and cores, replacing many traditional techniques. These changes have had their influence equally in the large, highly mechanized mass-production foundries and in the jobbing foundries catering for short run work. An ironfoundry is an extremely exacting environment for mechanical equipment and for all control engineering. For this reason automatic moulding and other foundry plant need special design and robust construction. Most mechanized foundry plant of an automatic character represents a high capital investment which must run for long periods without breakdown, requiring long orders and work of a repetitive character.

Variable-Ratio Chain Drives With Noncircular Sprockets and Minimum Slack-Theory and Application

1991 ◽  
Vol 113 (3) ◽  
pp. 253-262 ◽  
Author(s):  
F. Freudenstein ◽  
Ching-Kong Chen
Keyword(s):  
Mechanical Equipment ◽  
Variable Ratio ◽  
Numerical Examples ◽  
Harmonic Motion ◽  
Wide Range ◽  
Component Variable ◽  
Noncircular Gears ◽  
Nonuniform Motion ◽  
Chain Drives ◽  
Motion Generator

The theory has been developed for the design of a new mechanical component: variable-ratio chain drives with noncircular sprockets and minimum slack. The theory is based on a kinematic correspondence between noncircular chain drives and noncircular gears. This in turn permits the development of an algorithm for minimizing chain slack. The theory is applicable to a wide range of mechanical equipment, including bicycles and nonuniform motion transmissions involving band drives, tape drives, and timing belts. Such drives may or may not require a tensioner, but if they do, tensioner displacement will be minimal. Numerical examples illustrate applications to the design of an optimum bicycle configuration and a harmonic-motion generator.

Sign in / Sign up

Export Citation Format

Share Document