A hybrid compensation scheme for piezoelectric ceramic actuators(PEAs)is proposed.In the hybrid compensation scheme,the input rate-dependent hysteresis characteristics of the PEAs are compensated.The feedforward contr...A hybrid compensation scheme for piezoelectric ceramic actuators(PEAs)is proposed.In the hybrid compensation scheme,the input rate-dependent hysteresis characteristics of the PEAs are compensated.The feedforward controller is a novel input rate-dependent neural network hysteresis inverse model,while the feedback controller is a proportion integration differentiation(PID)controller.In the proposed inverse model,an input ratedependent auxiliary inverse operator(RAIO)and output of the hysteresis construct the expanded input space(EIS)of the inverse model which transforms the hysteresis inverse with multi-valued mapping into single-valued mapping,and the wiping-out,rate-dependent and continuous properties of the RAIO are analyzed in theories.Based on the EIS method,a hysteresis neural network inverse model,namely the dynamic back propagation neural network(DBPNN)model,is established.Moreover,a hybrid compensation scheme for the PEAs is designed to compensate for the hysteresis.Finally,the proposed method,the conventional PID controller and the hybrid controller with the modified input rate-dependent Prandtl-Ishlinskii(MRPI)model are all applied in the experimental platform.Experimental results show that the proposed method has obvious superiorities in the performance of the system.展开更多
Restorative proctocolectomy with ileal pouch–anal anastomosis has become the surgical treatment of choice for patients with refractory ulcerative colitis,colitis-associated dysplasia or familial adenomatous polyposis...Restorative proctocolectomy with ileal pouch–anal anastomosis has become the surgical treatment of choice for patients with refractory ulcerative colitis,colitis-associated dysplasia or familial adenomatous polyposis.There are various pouch disorders and associated complications.Floppy pouch complex is defined as the presence of pouch prolapse,afferent limb syndrome,enterocele,redundant loop and folding pouch on pouchoscopy,gastrografin pouchogramor defecography.Common clinical presentation includes dyschezia,bloating,abdominal pain,straining or the sense of incomplete evacuation.Each disorder has its own unique endoscopic,radiographic and manometry findings.A range of therapeutic options are available for the management of the various causes of a pouch.展开更多
基金National Natural Science Foundation of China(Nos.62171285,61971120 and 62327807)。
文摘A hybrid compensation scheme for piezoelectric ceramic actuators(PEAs)is proposed.In the hybrid compensation scheme,the input rate-dependent hysteresis characteristics of the PEAs are compensated.The feedforward controller is a novel input rate-dependent neural network hysteresis inverse model,while the feedback controller is a proportion integration differentiation(PID)controller.In the proposed inverse model,an input ratedependent auxiliary inverse operator(RAIO)and output of the hysteresis construct the expanded input space(EIS)of the inverse model which transforms the hysteresis inverse with multi-valued mapping into single-valued mapping,and the wiping-out,rate-dependent and continuous properties of the RAIO are analyzed in theories.Based on the EIS method,a hysteresis neural network inverse model,namely the dynamic back propagation neural network(DBPNN)model,is established.Moreover,a hybrid compensation scheme for the PEAs is designed to compensate for the hysteresis.Finally,the proposed method,the conventional PID controller and the hybrid controller with the modified input rate-dependent Prandtl-Ishlinskii(MRPI)model are all applied in the experimental platform.Experimental results show that the proposed method has obvious superiorities in the performance of the system.
基金supported by the Ed and Joey Story Endowed Chair.
文摘Restorative proctocolectomy with ileal pouch–anal anastomosis has become the surgical treatment of choice for patients with refractory ulcerative colitis,colitis-associated dysplasia or familial adenomatous polyposis.There are various pouch disorders and associated complications.Floppy pouch complex is defined as the presence of pouch prolapse,afferent limb syndrome,enterocele,redundant loop and folding pouch on pouchoscopy,gastrografin pouchogramor defecography.Common clinical presentation includes dyschezia,bloating,abdominal pain,straining or the sense of incomplete evacuation.Each disorder has its own unique endoscopic,radiographic and manometry findings.A range of therapeutic options are available for the management of the various causes of a pouch.
