Haiwei L.,Shanghai Maritime University |
Weijian M.,Shanghai Maritime University |
Chong T.,Shanghai Maritime University |
Chong T.,Huadian Heavy Industries Co.
BioTechnology: An Indian Journal | Year: 2014
Construction machinery and equipment recently have been developed to be more energysaving, however, wasting energy and low efficiency in gantry crane have become increasingly prominent. Therefore, based on existing energy-saving technology, this paper proposed an intelligent guided energy-saving method for gantry crane in terms of operation process. This method can automatically detect the optimal luffing position in the process of goods falling down to precisely direct drivers' operation so that electrical energy generated in the falling process can be used for the luffing of gantry crane to achieve energy saving. To verify this method, MATLAB/Simulinkis used to obtain a simulation platform for the whole system. According to the analysis of the simulation results, this method is demonstrated that it can significantly reduce the energy consumption of gantry crane under the best experiment condition. © Trade Science Inc. Source
Jiang H.,Beijing Jiaotong University |
Chu Q.,Shandong Polytechnic |
Cui Y.-T.,Huadian Heavy Industries Co.
Tiedao Xuebao/Journal of the China Railway Society | Year: 2015
With a typical railway bridge in deep water as an example, a pier-water interaction model was established using potential-based fluid method based on fluid-structure interaction theory. The influence of pulse parameters of near-fault ground motions on hydrodynamic pressure and earthquake response on the equivalent pier was quantitatively analyzed, using artificially synthesized near-fault equivalent velocity pulse method. The results showed that the dynamic response of structure may be multiplied under pulse effect. Three kinds of pulse parameters, such as pulse peak Vp, pulse period Tp and pulse type, had great influence on the seismic behavior of pier. With the augmentation of Vp, the dynamic response of piers increased under different water depths. When Tp was close to the natural vibration period of pier, the dynamic response amplified significantly. For this pier example, C-type pulse had the greatest effect, with the B-type pulse showing the second greatest effect, and A-type pulse showing the minimal effect. Combined with response spectrum analysis, the ways and magnitude of influence for each pulse parameter were different, and these could be explained from the distribution characteristics of intensity and spectrum period of impulsive ground motion. Therefore, for the seismic design of deep-water bridges in near-fault zone, potential influence of different pulse parameters should be contrastively discussed to ensure the safety of bridge structures. ©, 2015, Science Press. All right reserved. Source
Hongwei Z.,Anhui University of Technology |
Hongwei Z.,Nanjing Southeast University |
Yizhu H.,Anhui University of Technology |
Jizu L.,Huadian Heavy Industries Co. |
And 2 more authors.
Energy Materials 2014, Conference Proceedings | Year: 2014
Dynamic strain aging (DSA) and low-cycle fatigue (LCF) behavior of TP347H stainless steel in ultra-supercritical unit were investigated at 550-650 °C. All the LCF tests were carried out under a fully-reversed, total axial strain control mode at the total strain amplitude from ±0.2% to ±1.0%. The effects of DSA in cyclic stress response, microstructure evolution and fatigue fracture surfaces and fatigue life were investigated in detail. The results show that DSA occurs during tensile, which is manifested as serrated flow in tensile stress-strain curves. The apparent activation energy for appearing of serrations in tensile stress-strain curves was 270 kJ/mol. Pipe diffusion of substitutional solutes such as Cr and Nb along the dislocation core, and strong interactions between segregated solutes and dislocations are considered as the mechanism of DSA. DSA partly restricts dislocation cross-slip, and dislocation cross-slip and planar-slip happen simultaneously during LCF. A lot of planar structures form, which is due to dislocation gliding on the special plane. This localized deformation structures result in many crack initiation sites. Meanwhile, DSA hardening increases cyclic stress response, accelerating crack propagation, which reduces high temperature strain fatigue life of steel. Source
Liu X.,Huadian Heavy Industries Co. |
Xu F.-G.,University of Science and Technology Beijing |
Gong C.-X.,University of Science and Technology Beijing |
Li G.-D.,Huadian Heavy Industries Co.
Petrochemical Equipment | Year: 2015
The strength of the expanded fin array-aluminum tubes, the bending of tube-tubesheet and fatigue are considered as the main factors on performance and service life. The maximum load and the experimental curve are measured by experiments in case of disengagement of fin array-tubes, bending of tube-tubesheet, looseness and break of tubes root, and the failure characteristics were analyzed. © 2015, Lanzhou Petroleum Machinery Research Institute. All rights reserved. Source
Tang H.,Shanghai JiaoTong University |
Jiang W.,Shanghai JiaoTong University |
Zhong Z.,Huadian Heavy Industries Co. |
Zhao Y.,Huadian Heavy Industries Co.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2014
To investigate the formation mechanism of low frequency noise in a heat recovery steam generator (HRSG), numerical simulation was carried out to analyze the non-stationary flow field and aero-acoustic noise in the heat exchanger tube array using large eddy simulation (LES) method combined with Ffowcs Williams-Hawkings (FW-H) equation. Features of vortex noise were studied respectively for sing tube, finned-tube and tube array, and the results were compared with that of actual measurements. Results show that the low frequency noise of HRSG mainly comes from the vortex shedding in the heat exchanger tube array. The vortex noise of single tube has obvious characteristic frequency, and the spiral fin reduces both the characteristic frequency and total sound level of finned tube. For tube arrays, the vortex noise is of the narrowband type with a certain bandwidth, due to enhanced interaction of flow fields between the tubes. ©, 2014, Shanghai Power Equipment Research Institute. All right reserved. Source