The traditional measurement method was inaccurate to evaluate the motor controller efficiency,which the measurement efficiency value could be more than 100%in practical testing experiments.To deal with this issue,an i...The traditional measurement method was inaccurate to evaluate the motor controller efficiency,which the measurement efficiency value could be more than 100%in practical testing experiments.To deal with this issue,an improved electrical measurement method for the motor controller efficiency is proposed in this paper,which is established by analyzing the power loss distribution and phase currents of the motor controller.It is demonstrated that the SiC MOSFET chips are the main power loss devices in the motor controller,accounting for more than 93.1%of the total power loss.The accuracy of the proposed method is compared with the traditional method in simulation.It shows that the test error of the efficiency obtained by the traditional method fluctuates on a large scale,which varied from 0.094%to 1.911%.Compared with the traditional method,the test error of the proposed method appears to be less than 0.083%,which provides significant guidance for the motor controller efficiency test and design.展开更多
As an energy converter,electromagnetic linear actuators(EMLAs)have been widely used in industries.Multidisciplinary methodology is a preferred tool for the design and optimization of EMLA.In this paper,a multidiscipli...As an energy converter,electromagnetic linear actuators(EMLAs)have been widely used in industries.Multidisciplinary methodology is a preferred tool for the design and optimization of EMLA.In this paper,a multidisciplinary method was proposed for revealing the influence mechanism of load on EMLA’s loss.The motion trajectory of EMLA is planned through tracking differentiator,an adaptive robust control was adopted to compensate the influence of load on motion trajectory.A control-electromagnetic-mechanical coupling model was established and verified experimentally.The influence laws of load change on EMLA’s loss,loss composition and loss distribution were analyzed quantitatively.The results show that the data error of experiment,and simulation result of input energy,mechanical work,and iron loss is less than 3%.The iron loss accounts for less than 54.9%of the total loss under no-load condition,while the iron loss increases with the increase of load.For iron loss distribution,only the percentage of inner yoke keeps increasing with the increase of load.The composition and distribution of loss are the basis of thermal analysis and design.展开更多
Loss of Control (LOC) is the primary factor responsible for the majority of fatal air accidents during past decade. LOC is characterized by the pilot’s inability to control the aircraft and is typically associated wi...Loss of Control (LOC) is the primary factor responsible for the majority of fatal air accidents during past decade. LOC is characterized by the pilot’s inability to control the aircraft and is typically associated with unpredictable behavior, potentially leading to loss of the aircraft and life. In this work, the minimum time dynamic optimization problem to LOC is treated using Pontryagin’s Maximum Principle (PMP). The resulting two point boundary value problem is solved using stochastic shooting point methods via a differential evolution scheme (DE). The minimum time until LOC metric is computed for corresponding spatial control limits. Simulations are performed using a linearized longitudinal aircraft model to illustrate the concept.展开更多
目的观察不同减重方式对2型糖尿病肥胖患者内脏脂肪含量、血糖控制及分泌型卷曲相关蛋白5(secretory curl related protein 5,SFRP5)、脂联素(adiponectin,APN)、瘦素(leptin,LP)的调节作用,以期寻找一种更适合于糖尿病合并肥胖人群的...目的观察不同减重方式对2型糖尿病肥胖患者内脏脂肪含量、血糖控制及分泌型卷曲相关蛋白5(secretory curl related protein 5,SFRP5)、脂联素(adiponectin,APN)、瘦素(leptin,LP)的调节作用,以期寻找一种更适合于糖尿病合并肥胖人群的减重、降糖模式。方法选取2018-06/2020-12月作者医院2型糖尿病肥胖患者195例,以随机数字表法分为试验A组、试验B组、试验C组、试验D组、对照组,每组各39例。试验A组给予限制热量平衡饮食,试验B组给予正常热量饮食联合口服二甲双胍、试验C组给予正常热量饮食联合口服奥利司他、试验D组给予正常热量饮食联合利拉鲁肽,对照组给予正常热量饮食,均治疗3个月。比较5组治疗前、治疗3个月后体质量、体质量指数(body mass index,BMI)、腰围、内脏脂肪含量、糖化血红蛋白(haemoglobin A1c,HbA1c)、空腹血糖(fasting blood glucose,FPG)、餐后2 h血糖(postprandial 2-hour blood glucose,2hPG)、高密度脂蛋白胆固醇(high-density lipoprotein cholesterol,HDL-C)、低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)、总胆固醇(total cholesterol,TC)、甘油三酯(triglycerides,TG)、稳态模型胰岛素抵抗指数(homeostatic model assessment for insulin resistance,HOMA-IR)、稳态模型胰岛β细胞功能指数(homeostatic model assessment ofβ-cell function,HOMA-β)、SFRP5、APN、LP水平。结果治疗3个月后,(1)患者体质量、BMI、腰围、内脏脂肪含量组间比较,试验C组<试验D组<试验B组<试验A组<对照组(P<0.05);(2)HbA1c、FPG、2hPG水平组间比较,试验B组和试验D组<试验C组<试验A组<对照组(P<0.05);(3)LDL-C、TC、TG水平组间比较,试验C组<试验D组<试验B组<试验A组<对照组(P<0.05),HDL-C水平的组间比较,试验C组>试验D组>试验B组>试验A组>对照组(P<0.05);(4)HOMA-IR、HOMA-β水平组间比较,试验B组和试验D组<试验C组<试验A组<对照组(P<0.05);(5)血清SFRP5水平组间比较,试验D组>试验C组>试验B组>试验A组>对照组(P<0.05),APN水平组间比较,试验C组>试验D组>试验B组>试验A组>对照组(P<0.05),LP水平组间比较,试验C组<试验D组<试验B组<试验A组<对照组(P<0.05)。结论2型糖尿病肥胖患者采用二甲双胍、利拉鲁肽治疗降糖、调节胰岛素敏感性作用显著,采用奥利司他治疗减重、降脂效果显著,还可调节SFRP5、APN、LP表达水平,减轻LP抵抗状态,加速脂肪分解及糖代谢。展开更多
基金Supported by National Key Research and Development Program of China(2016YFB0100605)。
文摘The traditional measurement method was inaccurate to evaluate the motor controller efficiency,which the measurement efficiency value could be more than 100%in practical testing experiments.To deal with this issue,an improved electrical measurement method for the motor controller efficiency is proposed in this paper,which is established by analyzing the power loss distribution and phase currents of the motor controller.It is demonstrated that the SiC MOSFET chips are the main power loss devices in the motor controller,accounting for more than 93.1%of the total power loss.The accuracy of the proposed method is compared with the traditional method in simulation.It shows that the test error of the efficiency obtained by the traditional method fluctuates on a large scale,which varied from 0.094%to 1.911%.Compared with the traditional method,the test error of the proposed method appears to be less than 0.083%,which provides significant guidance for the motor controller efficiency test and design.
基金funded by the National Natural Science Foundation of China,Grant Nos.51905319,51975341,51875326the National Key Research and Development Project,China under Grant 2017YFB0102004the Shandong Provincial Natural Science Foundation,China under Grant ZR2019MEE049.
文摘As an energy converter,electromagnetic linear actuators(EMLAs)have been widely used in industries.Multidisciplinary methodology is a preferred tool for the design and optimization of EMLA.In this paper,a multidisciplinary method was proposed for revealing the influence mechanism of load on EMLA’s loss.The motion trajectory of EMLA is planned through tracking differentiator,an adaptive robust control was adopted to compensate the influence of load on motion trajectory.A control-electromagnetic-mechanical coupling model was established and verified experimentally.The influence laws of load change on EMLA’s loss,loss composition and loss distribution were analyzed quantitatively.The results show that the data error of experiment,and simulation result of input energy,mechanical work,and iron loss is less than 3%.The iron loss accounts for less than 54.9%of the total loss under no-load condition,while the iron loss increases with the increase of load.For iron loss distribution,only the percentage of inner yoke keeps increasing with the increase of load.The composition and distribution of loss are the basis of thermal analysis and design.
文摘Loss of Control (LOC) is the primary factor responsible for the majority of fatal air accidents during past decade. LOC is characterized by the pilot’s inability to control the aircraft and is typically associated with unpredictable behavior, potentially leading to loss of the aircraft and life. In this work, the minimum time dynamic optimization problem to LOC is treated using Pontryagin’s Maximum Principle (PMP). The resulting two point boundary value problem is solved using stochastic shooting point methods via a differential evolution scheme (DE). The minimum time until LOC metric is computed for corresponding spatial control limits. Simulations are performed using a linearized longitudinal aircraft model to illustrate the concept.
文摘目的观察不同减重方式对2型糖尿病肥胖患者内脏脂肪含量、血糖控制及分泌型卷曲相关蛋白5(secretory curl related protein 5,SFRP5)、脂联素(adiponectin,APN)、瘦素(leptin,LP)的调节作用,以期寻找一种更适合于糖尿病合并肥胖人群的减重、降糖模式。方法选取2018-06/2020-12月作者医院2型糖尿病肥胖患者195例,以随机数字表法分为试验A组、试验B组、试验C组、试验D组、对照组,每组各39例。试验A组给予限制热量平衡饮食,试验B组给予正常热量饮食联合口服二甲双胍、试验C组给予正常热量饮食联合口服奥利司他、试验D组给予正常热量饮食联合利拉鲁肽,对照组给予正常热量饮食,均治疗3个月。比较5组治疗前、治疗3个月后体质量、体质量指数(body mass index,BMI)、腰围、内脏脂肪含量、糖化血红蛋白(haemoglobin A1c,HbA1c)、空腹血糖(fasting blood glucose,FPG)、餐后2 h血糖(postprandial 2-hour blood glucose,2hPG)、高密度脂蛋白胆固醇(high-density lipoprotein cholesterol,HDL-C)、低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)、总胆固醇(total cholesterol,TC)、甘油三酯(triglycerides,TG)、稳态模型胰岛素抵抗指数(homeostatic model assessment for insulin resistance,HOMA-IR)、稳态模型胰岛β细胞功能指数(homeostatic model assessment ofβ-cell function,HOMA-β)、SFRP5、APN、LP水平。结果治疗3个月后,(1)患者体质量、BMI、腰围、内脏脂肪含量组间比较,试验C组<试验D组<试验B组<试验A组<对照组(P<0.05);(2)HbA1c、FPG、2hPG水平组间比较,试验B组和试验D组<试验C组<试验A组<对照组(P<0.05);(3)LDL-C、TC、TG水平组间比较,试验C组<试验D组<试验B组<试验A组<对照组(P<0.05),HDL-C水平的组间比较,试验C组>试验D组>试验B组>试验A组>对照组(P<0.05);(4)HOMA-IR、HOMA-β水平组间比较,试验B组和试验D组<试验C组<试验A组<对照组(P<0.05);(5)血清SFRP5水平组间比较,试验D组>试验C组>试验B组>试验A组>对照组(P<0.05),APN水平组间比较,试验C组>试验D组>试验B组>试验A组>对照组(P<0.05),LP水平组间比较,试验C组<试验D组<试验B组<试验A组<对照组(P<0.05)。结论2型糖尿病肥胖患者采用二甲双胍、利拉鲁肽治疗降糖、调节胰岛素敏感性作用显著,采用奥利司他治疗减重、降脂效果显著,还可调节SFRP5、APN、LP表达水平,减轻LP抵抗状态,加速脂肪分解及糖代谢。
