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Two‑vector predictive current control strategy based on maximum torque per ampere control for PMSMs
Duo Jin,Housheng Zhang,Shengjie Zhu,Ao Wang,Junjie Jiang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.8
In permanent magnet synchronous motor systems with double closed-loop maximum torque current ratio control, a PI adjuster is used as the current inner ring. Unfortunately, the current may not be tracked effectively due to controller saturation when the load suddenly changes. To counteract this effect, a novel two-vector predictive current control strategy based on maximum torque current ratio control is proposed in this paper. The control strategy introduces the model predictive current control of two voltage vectors based on maximum torque per ampere control, which is acted upon by two voltage vectors in one control period. The second selected vector is no longer limited to the null vector. The orientation and amplitude of the synthesized virtual voltage vector are adjustable. Simulation results indicate that the proposed control method has the advantages of maximum torque per ampere control and model predictive control. It optimizes the stability of the system and reduces the fluctuation of the stator current.
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Comprehensive study of relationships between surface morphology parameters and contact stress
Duo Yang,Jin-Yuan Tang,Wei Zhou,Yuqin Wen 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11
Surface roughness morphology seriously restricts workpiece interface contact performance, and therefore it is necessary to remove the fog of relationships between morphology parameters and contact stress (CS). To study the issue, use correlation analysis and BP network to set up correlation mapping model, thereafter introduce global sensitivity analysis Morris (qualitative) and Sobol (quantitative) to get “main influence parameters (MIP)”. Afterwards, construct a optimal nonlinear regression model between MIP and CS in line with complete polynomial and the idea of permutation and combination. Finally, analyze MIP influence path on CS from statistical path analysis. The paper main contributions are as follows: 1. From the perspective of theoretical analysis, a reasonable method to select parameters about CS performance characterization is proposed to avoid the empirical selection errors; 2. Correlation relationships bridge is built between MIP and CS, with quantitative influence way of parameters on contact stress studied and clarified.
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Duo, Zhang Guang,Mu, Wu Jin 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
This paper implements efficiently the problem of Mechanical Theorem Proving (MTP) in propositional logic according to the Davis & Putnam Rules. Through applying strategies, such as deleting, decomposing, merging and removing sequentially all the atoms and their negations, we can abandon all the used sets of ground clauses, and put forword the refutation procedure determinately step by step. And the conclusion can be obtained within at most m steps. (Here m indicates the number of the atoms in s0, the initial set of ground clauses.) Compared with all the past classical methods in solving the problem of MTP, the method provided by this paper has several advantages: simple, convenient, determinate and highly efficient; and it requires only a lower_level support of environment, for using non_intelligent languages, BASIC for example, may implement the problem of MTP simply and efficiently.
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數種 蛋白質添加 給食時 白鼠臟器中 SH group 및 Cholesterol 含量
高鎭福,柳總根,崔田道,李成東 최신의학사 1972 最新醫學 Vol.15 No.12
The effect of various protein sources on the contents of sulfhydryl group in liver and cholesterol in plasma and liver of rats were observed in this study. Experimental animal, 72 male albino rats, 45±5 day of after birth were used. Either rice or wheat was made as a basic diet, and whole milk powder, egg powder, fish flour (anchovy flour) and soybean flour of 5% level, respectively, was supplemented to each basic diet as protein source. Each animal group was fed on the corresponding diet for 96 days, and then the sulfhydryl group in the liver and the cholesterol in the liver and plasma were determined. The results are summarized as follows: 1. The sulfhydryl group contents in the liver shows no difference between each group of protein supplemented, and between groups of basic diets and protein supplemented. 2. The total cholesterol contents in the liver does not change reqularly as each protein source is supplemented, to rice, but increase, to wheat diet. 3. The free cholesterol contents in the liver increases through each protein supplement to basic diets. 4. The total cholesterol in the plasma is not influenced by each protein supplemented, and groups of protein supplemented show similar contents to group of either rice or wheat. The above results leads to the conclusion that the cholesterol contents in the liver and plasma more or less affected by the kinds of protein source.
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米麥混食에 依한 白鼠의 肝 및 血淸內 酵素活性에 對하여
金鏞鎭,尹燾善,李成東,柳總根 최신의학사 1973 最新醫學 Vol.16 No.10
The activity of GOT and GPT in the liver and serum of the rats that were fed mixed diets which were different mixed rate between rice and barley or wheat were observed. The experimental animals, albino rats weghting 100-120gm were fed on rice diet mixed of barley and wheat in 10%, 30% and 50%. Experimental term was devided into for 4,8 and 12 weeks. The results obtained are summarized as follow: 1. The activity of GOT and GPT in the liver and serum have shown some similartendency among the diet mixed rate and diet groups. 2. The activity of GOT and GPT in the liver and serum have shown remakable change according to each feeding term.
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崔田道,朱軫淳 고려대학교 의과대학 1973 고려대 의대 잡지 Vol.10 No.3
The experiment was carried out on 8 healthy female college-student 19-22 years old and they were fed three times a day with a test meals for 7 days of each experimental period. The test meals used were pulses protein diet, fishes protein diet and meat protein diet, and they supplied for each subject per day are as follows : a) The pulses protein diet; protein 87.69 (pulses source : 45.8g) fat: 41.1g (pulses source : 22.99) carbohydrate : 411.9g calcium : 605.0㎎ (pulses source: 399.9㎎) phosphorus: 1,083.3㎎ (pulses source: 497.5㎎), and 2,367 ㎉ b) The fishes protein diet; protein: 88.1g (fishes source: 34.89) fat : 17.0g (fishes source: 3.29) carbohydrate : 446.29 calcium : 442.4㎎ (fishes source: 114.1㎎) Phosphorus : 1,369.3㎎ (fishes source : 399.0㎎), and 2,310 ㎉ c) The meat protein diet: protein : 87.60 (meat source: 40.2g) fat: 25.99 (meat source: 6.39) carbohydrate : 431.79 calcium: 360.6㎎ (meat source: 12.0㎎) phosphorus: 798.7㎎ (meat source : 41.6㎎), and 2,359 ㎉ The absorption rates of protein, fat, carbohydrate. calcium and phosphorus in each diet, and 17-ketosteroid excrcted in urine were determined. The results obtained are summarized as follows: 1. The protein absorption rate of the pulses protein diet was lower than that of the fishes and meat protein diet. 2. The nitrogen balances in the pulses (+1.4±0.2g), fishes (+2.1±0.39) and meat (+2.4±0.39) protein diet were positive balances respectively. 3. The fat absorption rate of the fishes protein diet (60.9±2.6%) was significantly lower than that of the pulses and meat protein diet. 4. The carbohydrate absorption rates were 94.8±3.5∼96.2±0.4% in each diet, and so it seems to be absorbed almost entirely but cellulose. 5. The calory utillization rates in each diet were .6±0.4∼91.0±0.4%. 6. The calcium absorption rates of pulses protein diet (30.1±1.8%) were significantly lower than those of the fishes (52.5±2.5%) and meat protein diet (49.5±2.0%). 7. The phosphorus absorption rates of the pulses protein diet (45.9±2.3%) were significantly lower than those of the fishes (78.7±2.8%) and meat protein diet (81.3±2.2%). 8. The 17-ketosteroid contents excreted in urine of pulses protein diet (4.81±0.23㎎) were higher than those of the fishes (3.76±0.18㎎) and meat protein diet (3.30±0.12㎎), hut it showed no remarkable change of contents for each subject with the same diet. In the view of the above results; it can be seen that the absorption rates of each nutrient were good in the meat protein diet, but the absorption rates of protein, calcium and phosphorus in the pulses protein diet and those of fat in the fishes protein diet were not so good, respectively.
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