The application of hydraulic servo technique in curtain wall doors amp; windows measuring system 液壓伺服技術在幕墻門窗檢測系統(tǒng)中的應用
As a kind of low cast, simple and anti-pollution system, pneumatic proportional position servo system has become the top subjects in the fields of pneumatic servo technique in recent years 氣動比例位置控制系統(tǒng)由于其價廉、簡單、抗污染能力強,已成為氣動伺服技術中的重要課題。
But it is gas medium with compressibility and low viscosity that leads to low natural frequency, small damping ratio, low positional precision and rigidity, bad low speed characteristics, which limit the application of pneumatic servo technique 但因為氣體的可壓縮性和低粘性,導致氣壓伺服系統(tǒng)固有頻率低、阻尼比小、定位精度和定位剛度低、低速性能差,使得氣壓伺服技術的應用受到限制。
Permanent magnet ac servo technique has grown rapidly since 1980's . because the applications of ac servomotors become more and more complex, many higher requests are offered . the servo systems are hoped to have the ability of adaptation and better performance against disturbance 自80年代以來,永磁交流伺服技術得到了迅速發(fā)展,利用交流伺服電動機構成的系統(tǒng)也越來越呈現(xiàn)多樣化和復雜化,對伺服控制提出了更高的要求:即希望伺服系統(tǒng)具有一定的自適應能力和較強的抗干擾能力。
Currently most domestic break-test-plateform adopt the liquid-pressure-servo technique, which possesses the advantages of higher frequency-response and higher controlling exactness, but in the same time, the disadvantages of higher cost, variation of function with the change of oil viscousness produced by the fluctuation of temperature . moreover, the liquid-pressure system is sensitive to the pollution of oil, so it is necessary to take protective and filtrating steps 目前,國內(nèi)的制動器試驗臺大多采用的是液壓伺服控制,這種控制具有響應頻率高、控制精度高等優(yōu)點,主要缺點是系統(tǒng)成本高、油液粘度隨溫度變化引起工作性能的變化、且液壓系統(tǒng)對油液的污染比較敏感,必須要有良好的保護和過濾措施。