本文選題：人工心臟 + 液力懸浮��； 參考：《浙江大學(xué)》2012年博士論文

【摘要】：本課題以人工心臟液力懸浮軸承為研究對(duì)象,針對(duì)懸浮支承結(jié)構(gòu)設(shè)計(jì)及其血液相容性展開系統(tǒng)研究。開展了懸浮支承軸承結(jié)構(gòu)設(shè)計(jì)、結(jié)構(gòu)參數(shù)優(yōu)化、穩(wěn)定與脈動(dòng)條件下的轉(zhuǎn)子懸浮位移測(cè)試、液力懸浮軸承結(jié)構(gòu)的血液相容性等研究,為人工心臟液力懸浮支承結(jié)構(gòu)設(shè)計(jì)和血液相容性研究提供了有價(jià)值的參考。 本文首先根據(jù)液力懸浮支承流場(chǎng)的特點(diǎn)建立了懸浮支承間隙內(nèi)流體流動(dòng)的數(shù)學(xué)模型,并在此基礎(chǔ)上初步開展了向心軸承和止推軸承的結(jié)構(gòu)設(shè)計(jì)；其次,開展人工心臟球型液力懸浮軸承結(jié)構(gòu)設(shè)計(jì),并進(jìn)行了相關(guān)的實(shí)驗(yàn)研究；對(duì)于錐型液力懸浮軸承結(jié)構(gòu),通過(guò)數(shù)值模擬對(duì)比分析了不同最小間隙內(nèi)流體流動(dòng)特性及懸浮支承力；對(duì)于主軸開設(shè)螺旋槽型懸浮支承軸承結(jié)構(gòu),結(jié)合正交實(shí)驗(yàn)設(shè)計(jì)給出了一組最優(yōu)螺旋槽設(shè)計(jì)尺寸；在此基礎(chǔ)上,提出了一種低血栓螺旋槽液力懸浮軸承結(jié)構(gòu)設(shè)計(jì)方法,并對(duì)上止推軸承內(nèi)流體進(jìn)行了數(shù)值模擬,分析三種典型螺旋槽結(jié)構(gòu)設(shè)計(jì)的流量、懸浮支承力和壓力之間的關(guān)系,同時(shí)引入此類懸浮支承結(jié)構(gòu)的承載力-流量特征平面,并通過(guò)該特征平面對(duì)比分析了多種類型液力懸浮支承結(jié)構(gòu)設(shè)計(jì)的流量與懸浮支承力范圍。再次,對(duì)穩(wěn)定運(yùn)轉(zhuǎn)和脈動(dòng)干擾下的液力懸浮支承位移進(jìn)行了實(shí)驗(yàn)研究,測(cè)試了不同工況下,穩(wěn)定懸浮支承液膜在軸向與徑向的運(yùn)動(dòng)參數(shù)和懸浮位移之間的關(guān)系,并分析了相應(yīng)的軸承懸浮穩(wěn)定性能。最后,對(duì)液力懸浮支承間隙內(nèi)流體的血液相容性進(jìn)行了數(shù)值模擬,分析了不同懸浮支承結(jié)構(gòu)和不同進(jìn)出口壓力對(duì)懸浮支承流體的溶血特性影響,并通過(guò)動(dòng)物實(shí)驗(yàn)對(duì)液力懸浮支承結(jié)構(gòu)的抗血栓性能進(jìn)行了評(píng)價(jià)。 課題的主要研究工作如下： 1.液力懸浮支承研究。 在分析懸浮支承間隙流場(chǎng)流動(dòng)特性的基礎(chǔ)上,建立了穩(wěn)態(tài)載荷下液力懸浮支承流場(chǎng)的數(shù)學(xué)模型,并初步開展了向心軸承和止推軸承的結(jié)構(gòu)設(shè)計(jì)。在此基礎(chǔ)上,開展了人工心臟球型液力懸浮軸承結(jié)構(gòu)設(shè)計(jì)和實(shí)驗(yàn)研究、錐型和主軸開設(shè)螺旋槽型懸浮軸承結(jié)構(gòu)人工心臟的結(jié)構(gòu)設(shè)計(jì)和數(shù)值模擬。通過(guò)實(shí)驗(yàn)研究,研究設(shè)計(jì)的球型液力懸浮支承結(jié)構(gòu)是否滿足懸浮要求；通過(guò)數(shù)值模擬,開展錐型懸浮支承結(jié)構(gòu)最小間隙與懸浮支承力之間關(guān)系的研究,給出主軸開設(shè)螺旋槽型液力懸浮支承結(jié)構(gòu)的最大懸浮支承力結(jié)構(gòu)設(shè)計(jì)參數(shù),并對(duì)比分析了兩種懸浮支承結(jié)構(gòu)內(nèi)流體的流量。 2.低血栓螺旋槽液力懸浮軸承結(jié)構(gòu)設(shè)計(jì)及數(shù)值模擬。 設(shè)計(jì)了一種新型螺旋槽軸承,并將其應(yīng)用到以長(zhǎng)期植入人體為目標(biāo)的人工心臟轉(zhuǎn)子支承中。螺旋槽設(shè)計(jì)的特點(diǎn)是其寬度隨著半徑的變大而逐漸變窄,從而可以利用動(dòng)壓效應(yīng)增加懸浮支承力,且螺旋槽的旋線方向與轉(zhuǎn)子旋轉(zhuǎn)方向相同可以促進(jìn)流體流動(dòng),增加懸浮間隙中的流量,從而有效避免血栓。通過(guò)三維數(shù)值模擬對(duì)新型螺旋槽設(shè)計(jì)與傳統(tǒng)設(shè)計(jì)進(jìn)行對(duì)比,并引入表征流量和懸浮支承力關(guān)系的特征平面,對(duì)多種類型的螺旋槽軸承設(shè)計(jì)的進(jìn)行承載力-流量對(duì)比,將對(duì)比結(jié)果統(tǒng)一于同一個(gè)承載力-流量特征平面中,通過(guò)該特征平面直接給出各種類型螺旋槽設(shè)計(jì)的承載力/流量變化。 3.液力懸浮支承位移測(cè)試實(shí)驗(yàn)研究。 選用具有較好承載力/流量特性的液力懸浮支承結(jié)構(gòu)參數(shù),設(shè)計(jì)并加工液力懸浮測(cè)試泵,搭建穩(wěn)態(tài)條件和脈動(dòng)條件下軸向、徑向測(cè)試實(shí)驗(yàn)臺(tái),測(cè)試懸浮轉(zhuǎn)子在軸向的絕對(duì)位移和徑向間隙的變化情況。對(duì)于穩(wěn)態(tài)條件下的位移測(cè)試,通過(guò)研究轉(zhuǎn)速、螺旋槽結(jié)構(gòu)參數(shù)與轉(zhuǎn)子懸浮位移的關(guān)系,給出各種懸浮支承結(jié)構(gòu)能夠穩(wěn)定支承的轉(zhuǎn)速范圍、徑向轉(zhuǎn)子運(yùn)動(dòng)的間隙變化范圍,研究轉(zhuǎn)子徑向運(yùn)動(dòng)軌跡的變化規(guī)律；對(duì)于脈動(dòng)條件下的位移測(cè)試,通過(guò)測(cè)試不同脈壓下軸向位移量和徑向間隙變化量,分析對(duì)比不同工況下懸浮支承液膜的變化情況,通過(guò)計(jì)算得出徑向半徑間隙與偏心距的差值變化情況,分析轉(zhuǎn)子的懸浮穩(wěn)定性能并給出轉(zhuǎn)子能夠穩(wěn)定懸浮的轉(zhuǎn)速調(diào)節(jié)范圍。 4.液力懸浮支承的血液相容性研究。 采用拉格朗日粒子追蹤法對(duì)懸浮支承間隙內(nèi)的血液進(jìn)行分析,根據(jù)經(jīng)驗(yàn)公式,計(jì)算不同懸浮支承間隙結(jié)構(gòu)內(nèi)剪切應(yīng)力對(duì)紅細(xì)胞的作用及每個(gè)粒子在流場(chǎng)中停留的時(shí)間,判斷所設(shè)計(jì)的螺旋槽結(jié)構(gòu)溶血估算值是否能夠滿足懸浮支承對(duì)溶血性能的要求。在此基礎(chǔ)上,通過(guò)動(dòng)物實(shí)驗(yàn)對(duì)螺旋槽結(jié)構(gòu)進(jìn)行抗血栓性能評(píng)價(jià)。
[Abstract]:The research on the structure of suspension bearing , the optimization of the structure parameters , the stability of the rotor suspension displacement and the blood compatibility of the hydrodynamic suspension bearing structure have been carried out in order to provide valuable reference for the study of the structure design and the blood compatibility of the artificial cardiac hydrodynamic suspension bearing .


In this paper , the mathematical model of fluid flow in floating bearing clearance is established according to the characteristics of liquid force suspension support flow field , and the structure design of centripetal bearing and thrust bearing is carried out preliminarily .
Secondly , the structure design of artificial heart spherical hydrodynamic suspension bearing is carried out , and relevant experimental research is carried out .
For the cone - shaped hydrodynamic suspension bearing structure , the fluid flow characteristics and the suspension supporting force in different minimum clearances are analyzed by numerical simulation .
According to the orthogonal experimental design , a set of optimal spiral groove design sizes are given .
On the basis of this , a design method of liquid - force suspension bearing with low thrombus spiral groove is presented , and the relationship between the flow rate , suspension support force and pressure of three typical spiral groove structures is analyzed .


The main research work of the subject is as follows :


1 . Hydraulic suspension support study .


On the basis of analyzing the flow characteristics of the floating bearing gap , a mathematical model of the hydrodynamic suspension bearing flow field under steady state load is established , and the structure design of the centripetal bearing and thrust bearing is preliminarily carried out . Based on this , the structural design and numerical simulation of the artificial heart with the spiral groove type suspension bearing structure of the artificial heart ball type hydrodynamic suspension bearing are carried out .
Through numerical simulation , the relationship between the minimum clearance and the suspension support force of the conical suspension support structure is studied . The design parameters of the maximum suspension supporting force of the spiral groove type hydrodynamic suspension support structure are given , and the flow rate of the fluid in the two suspension supporting structures is compared .


2 . Structure design and numerical simulation of hydraulic suspension bearing with low thrombus spiral groove .


A novel spiral groove bearing is designed and applied to artificial heart rotor support aiming at long - term implantation of human body . The spiral groove design features that its width is gradually narrowed as the radius becomes larger , so that the floating support force can be increased by the dynamic pressure effect , and the flow rate in the suspension gap can be increased by using the three - dimensional numerical simulation , and the comparison result is unified in the same bearing capacity - flow characteristic plane , and the bearing capacity / flow rate variation of various types of spiral groove designs is directly given through the characteristic plane .


3 . Experimental study on displacement test of hydraulic suspension support .


In this paper , the parameters of hydraulic suspension supporting structure with better bearing capacity / flow characteristics are selected , the hydraulic suspension test pump is designed and processed , the axial and radial test bench is built and processed under steady state conditions and pulsating conditions , and the relationship between the absolute displacement and radial clearance of the suspension rotor in the axial direction is tested .
For the displacement test under pulsating conditions , by testing the axial displacement and radial gap variation under different pulse pressures , the variation of the suspension support liquid film under different working conditions is analyzed , and the difference between the radial clearance and the eccentricity is calculated , and the suspension stability of the rotor can be analyzed and the range of rotation speed regulation of the rotor can be stably suspended .


4 . Study on blood compatibility of hydraulic suspension support .


According to the empirical formula , the effect of shear stress on red blood cells and the time of each particle staying in the flow field were calculated by using the Lagrange particle tracking method .

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2012
【分類號(hào)】：R318.11

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 范灝;具有周向分布楔形間隙結(jié)構(gòu)的液力懸浮血泵設(shè)計(jì)與研究[D];浙江大學(xué);2014年

2 譚卓;大氣隙永磁軸流式血泵磁力傳動(dòng)系統(tǒng)研究[D];中南大學(xué);2014年

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本文編號(hào)：1759399