174
Z. Liu et al.
However, since tube trailers are mostly used on highways during land transportation, they sometimes shuttle or stop in densely populated areas. As the working
pressure is high and the medium are flammable and explosive, it will cause huge
human life and property losses once an accident occurs. Therefore, comprehensive
analysis and safety assessment of tube trailers is of very practical significance.
In recent years, there have been more and more relevant studies on tube trailers in
China and abroad. Yu et al. [1] studied the fatigue life of tube trailer gas cylinders, and
proposed to control the inertial load during the transportation. Liu et al. [2] discussed
and analyzed the reasons for the wear of the external thread of the cylinder bottle,
the external thread structure of the bottle mouth, and the arrangement position of
the cylinder. Wang [3] analyzed the failure modes of CNG tube trailer gas cylinders
comprehensively, and believed that to reduce the failure damage, it is necessary to
improve the fixing structure of the bottle ends. Gao et al. [4] analyzed the actual
problems of tube trailer gas cylinder under different working conditions. Dong et al.
[5] proposed that the standardization of design and manufacture is a prerequisite
for safe use, and perfecting and improving technical requirements, forming technical standards are inevitable for industry development. Zhang et al. [6] put forward
suggestions on risk prevention for tube trailers from the aspects of material selection,
shape optimization, compliance with standards and anti-corrosion methods to ensure
the safety of the product under normal road conditions and correct operation.
As a kind of transportable equipment, tube trailers will inevitably experience
bumps and vibrations during road operation, which places more stringent requirements on the strength and fatigue life of the structure under random vibration conditions. It is quite difficult to perform accurate vibration analysis of tube trailers with
the conventional design method. Instead, it is effective to conduct random vibration
analysis using finite element method.
Different methods of random vibration analysis are available. Hao et al. [7]
performed random vibration analysis of the converter cabinet based on the ASD
(Acceleration Spectrum Density) spectrum values applied to all directions of the
structure. Yang et al. [8] conducted their analysis of the frame of Radix Ophiopogonis
harvester by applying the displacement spectral density of road roughness.
In this paper, ANSYS Workbench 19.0 was applied to overall model the key
structures of tube trailers (i.e. frames and gas cylinders). Random vibration analysis
was carried out under the excitation of ISTA 3A random vibration PSD curve from
the standard GB / T 4857.23-2012 “Basic Experiments of Transport Package Part
23: Random Vibration Test Method”. Stress analysis was conducted on the structure
based on 3σ theory and the strength and fatigue life of the structure under the random
vibration is evaluated and studied.
14.2 Random Vibration Analysis Concept
Random vibration analysis is also called power spectral density analysis [9], which is
a statistical method based on probability [10]. The power spectral density spectrum
Z. Liu et al.
However, since tube trailers are mostly used on highways during land transportation, they sometimes shuttle or stop in densely populated areas. As the working
pressure is high and the medium are flammable and explosive, it will cause huge
human life and property losses once an accident occurs. Therefore, comprehensive
analysis and safety assessment of tube trailers is of very practical significance.
In recent years, there have been more and more relevant studies on tube trailers in
China and abroad. Yu et al. [1] studied the fatigue life of tube trailer gas cylinders, and
proposed to control the inertial load during the transportation. Liu et al. [2] discussed
and analyzed the reasons for the wear of the external thread of the cylinder bottle,
the external thread structure of the bottle mouth, and the arrangement position of
the cylinder. Wang [3] analyzed the failure modes of CNG tube trailer gas cylinders
comprehensively, and believed that to reduce the failure damage, it is necessary to
improve the fixing structure of the bottle ends. Gao et al. [4] analyzed the actual
problems of tube trailer gas cylinder under different working conditions. Dong et al.
[5] proposed that the standardization of design and manufacture is a prerequisite
for safe use, and perfecting and improving technical requirements, forming technical standards are inevitable for industry development. Zhang et al. [6] put forward
suggestions on risk prevention for tube trailers from the aspects of material selection,
shape optimization, compliance with standards and anti-corrosion methods to ensure
the safety of the product under normal road conditions and correct operation.
As a kind of transportable equipment, tube trailers will inevitably experience
bumps and vibrations during road operation, which places more stringent requirements on the strength and fatigue life of the structure under random vibration conditions. It is quite difficult to perform accurate vibration analysis of tube trailers with
the conventional design method. Instead, it is effective to conduct random vibration
analysis using finite element method.
Different methods of random vibration analysis are available. Hao et al. [7]
performed random vibration analysis of the converter cabinet based on the ASD
(Acceleration Spectrum Density) spectrum values applied to all directions of the
structure. Yang et al. [8] conducted their analysis of the frame of Radix Ophiopogonis
harvester by applying the displacement spectral density of road roughness.
In this paper, ANSYS Workbench 19.0 was applied to overall model the key
structures of tube trailers (i.e. frames and gas cylinders). Random vibration analysis
was carried out under the excitation of ISTA 3A random vibration PSD curve from
the standard GB / T 4857.23-2012 “Basic Experiments of Transport Package Part
23: Random Vibration Test Method”. Stress analysis was conducted on the structure
based on 3σ theory and the strength and fatigue life of the structure under the random
vibration is evaluated and studied.
14.2 Random Vibration Analysis Concept
Random vibration analysis is also called power spectral density analysis [9], which is
a statistical method based on probability [10]. The power spectral density spectrum