ABSTRACT
Aiming at the problems of the traditional industrial robot fault diagnosis model, such as low accuracy, low efficiency, poor stability, and real-time performance in multi-fault state diagnosis, a fault diagnosis method based on DBN joint information fusion technology is proposed. By studying the information processing method and the deep learning theory, this paper takes the fault of the joint bearing of the industrial robot as the research object. It adopts the technique of combining the deep belief network (DBN) and wavelet energy entropy, and the fault diagnosis of industrial robot is studied. The wavelet transform is used to denoise, decompose, and reconstruct the vibration signal of the joint bearing of the industrial robot. The normalized eigenvector of the reconstructed energy entropy is established, and the normalized eigenvector is used as the input of the DBN. The improved D-S evidence theory is used to solve the problem of fusion of high conflict evidence to improve the fault model's recognition accuracy. Finally, the feasibility of the model is verified by collecting the fault sample data and creating the category sample label. The experiment shows that the fault diagnosis method designed can complete the fault diagnosis of industrial robot well, and the accuracy of the test set is 97.96%. Compared with the traditional fault diagnosis model, the method is improved obviously, and the stability of the model is good; the utility model has the advantages of short time and high diagnosis efficiency and is suitable for the diagnosis work under the condition of coexisting multiple faults. The reliability of this method in the fault diagnosis of the joint bearing of industrial robot is verified.
ABSTRACT
With the large-spike wheat cultivar Shannong 23 as test material,a field experiment was conducted by increasing the relative soil moisture content to 70% and 65% at jointing and anthesis stages. Four nitrogen levels,0 (N0), 180 (N1), 240 (N2) and 300 kg·hm-2(N3), were designed to examine the effects of nitrogen application rates on the interception of photosynthetic active radiation (PAR) and dry matter distribution of wheat at different canopy layers. The results showed that the total stem number of wheat population at anthesis stage, the leaf area index at 10, 20 and 30 days after anthesis, PAR capture ratio at upper and middle layers and total PAR capture ratio in wheat canopy on day 20 after anthesis of treatment N2 were significantly higher than those in the treatments of both N0 and N1. Those indexes showed no significant increase when the application rate increased to 300 kg·hm-2(N3). The vegetative organ dry matter accumulation of all layers at maturity stage of treatment N2 were significantly higher than N0 and N1. Compared with treatment N0 and N1, N2 increased the grain and total dry matter accumulation by 36.7% and 35.4%, 9.5% and 10.2%, respectively, but had no significant difference with treatment N3. The vegetative organ dry matter accumulation at all layers, grain and total dry matter accumulation were significantly and positively correlated with PAR capture ratio at upper and middle layers, and had no significant correlation with that at lower layer. The vegetative organ dry matter accumulation at all layers was significantly and positively correlated with grain dry matter accumulation. The application rate at 240 kg·hm-2(N2) would be the optimum treatment under the present experimental condition.
Subject(s)
Nitrogen , Triticum/growth & development , Agricultural Irrigation , Biomass , Soil , WaterABSTRACT
OBJECTIVE: To investigate the protective effect of grape seed proanthocyanidin (GSP) on spermatogenesis following testicular torsion/detorsion in mice. METHODS: Twenty-four healthy male Kunming mice, aged 8 weeks and weighing 25 - 27 g, were randomly divided into a control, a torsion and a treatment group, each containing 8 animals. The unilateral testicular torsion/detorsion model was established in the treatment and torsion groups. Thirty minutes before detorsion, the animals of the treatment group were injected intraperitoneally with 50 mg/kg GSP, and those of the torsion group with normal saline at the same dose, both for 3 days postoperatively. On the 4th day after surgery, ipsilateral orchiectomy were performed to detect histopathological changes, the levels of superoxide dismutase (SOD) and malondialdehyde (MDA), and the apoptotic index (AI) of germ cells in all the mice. RESULTS: Compared with the torsion group, the treated mice showed significantly increased Johnsen score (5.00 +/- 1.85 vs 7.38 +/- 0.92, P < 0.05), seminiferous tubule diameter ([176.50 +/- 1.60]microm vs [178.75 +/- 1.58] microm, P > 0.05), spermatogenic cell layers (3.75 +/- 1.03 vs 5.75 +/- 0.71, P < 0.05) and SOD activity ([29.04 +/- 4.46] U/mg prot vs [52.67 +/- 3.57] U/mg prot, P < 0.05), but remarkably reduced level of MDA ([4.63 +/- 0.05] nmol/mg prot vs [2.91 +/- 0.04] nmol/mg prot, P < 0.05) and AI of germ cells ([40.50 +/- 1.60]% vs [16.25 +/- 1.67] %, P < 0.05). CONCLUSION: Grape seed proanthocyanidin has a protective effect against spermatogenic injury in mice, the mechanisms of which may be related to its actions of scavenging oxygen free radicals, inhibiting lipid peroxidation and improving the antioxidant ability of the body.
