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【導(dǎo)讀】壓調(diào)速系統(tǒng)的動(dòng)態(tài)數(shù)學(xué)模型。通過(guò)計(jì)算機(jī)數(shù)字仿真系統(tǒng)，分析了滑臺(tái)產(chǎn)生滑動(dòng)影響。和運(yùn)動(dòng)不平穩(wěn)的原因及主要影響因素。從那些中可以得出那樣的結(jié)論，如果能合理。s1-流源，即調(diào)速閥出口流量；C1、c2—油缸無(wú)桿腔及有桿腔的液容；C2—自調(diào)背壓閥彈簧柔度；Se2—自調(diào)背壓閥彈簧的初始預(yù)緊力；V3,V4—油缸無(wú)桿腔及有桿腔內(nèi)容積；本文采用功率鍵合圖和狀態(tài)空間分折法建立系統(tǒng)的運(yùn)動(dòng)?；紝⒁猿潭炔煌赜绊懫涔ぷ餍阅?。時(shí)，從油缸有桿腔排出的壓力油經(jīng)自調(diào)背壓閥和換向閥流回油箱了。功率鍵合圖是一功效流圖，它是按著系統(tǒng)的能量傳遞方式，以實(shí)際結(jié)構(gòu)為基礎(chǔ)，連接，各鍵上流變量相等而力變量之和為零。TF表示不同能量形式間的變換器，TF. 下標(biāo)注的字母表示力變量或流變量的轉(zhuǎn)換比值。全箭頭表示控制關(guān)系。為于保證加工質(zhì)量的要求，必須盡可能地減小其速度波動(dòng)。其中的原因是負(fù)載的變化幅度不大，油缸兩腔的。壓力也就沒(méi)有較大變化，從而最終導(dǎo)致自調(diào)背壓閥的作用不夠明顯顯示。
【正文】 assumed to be of sine wave, in order to simplify discussion of the problem, The result of digital simulation is shown in It can be seen that, the response of the system is the sameas traditionl39。s and the differences between them are very small. The reason for this is that the variation of the load is not targe, there the pressures in chambers vary very little that is, the effect of the SABP valve is not obvious. IMPROVEMENT It is shown by studying, that dynamics of slide unit which used SABP speed control system as driving system is better than that of traditional system. To reduce the slide unit39。s impact, the back pressure of rod chamber has to be increased rapidly in the transients of load39。s vanishing。 on the other hand, to enhance the slide unit39。s motion stability, it is necessary to raise the system rigidity. However, main remendation lies in decreasing the volume of oil. It is known from system structure that, there is a lot of oilcontaining volume between the rod chamber and drain pipe as shown in . Because the volume exists, not only the effect of SABP valve is delayed and reduced, hut also the rigidity of the system is decreased. Therefore, it is hindered to further improve the impact and motion stability. To make the slide unit dynamics better, the structural dimensions of cyli nder39。s chamber and the SABP valve must be designed suitably. Based on simulations under the various structural dimensions and parison among the results, the following two measures can be taken for improvements: the ratio between volumeV4 and V3 is changed from to 1 approximately, as shown in Fig,6b。 142 the bottom diameter of spool of the SABP valve is increased from 10 mm to 13 mm length of side of triangular damping slot is decreased from 1 mm to the slide unites impact quantity can be reduced by 30%, and the time of dynamic response is shortened. In addition, slide unit39。s motion stability may be improved obviously. It is thus evident that improvements are very effective. CONCLUSIONS By the way of theoretical analysis and puter si mulating investigation, it is obvious that the SABP speed control system used as slide units driving system in modular machine tool is valuable for popularization and utilization, Main factors affecting the slide unit dynamics are the structural dimensions of the cylinder and the SABP valve. In the case of rationally designing, the slide unit dynamics may be obviously improved. Meanwhile, it is shown that the method of power bond graph and state space analysis is a very convenient and effective method in studying dynamics of plex nonlinear hydraulic system. REFERENCES [1] Peter dransfield Hydraulic Control SystemDesign and Analysis of Their Dynamics SpringerVerlag, 1981 [2] Dong Bengang, Zhang Zhixiang, Investigation on impact property of selfadjusting back pressure speed control system. Machine tool amp。 Hydraulics , 1987 GuangZhou, China, (in Chinese).
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