『壹』 求助！機械工程專業英語翻譯，急！！
1. The four-bar linkage may take form of a so-called crank-rocker or a double-rocker or a double-crank (drag-link) linkage, depending on the range of motion of the two links connected to the ground link. The input crank of a crank-rocker type can rotate continuously through 360, while the output link just "rocks" (or oscillates). As a particular case, in a parallelogram linkage, where the length of the input link equals that of the output link and the lengths of the coupler and the ground link are also the same, both the input and output link may rotate entirely around or switch into a crossed configuration called an antiparallelogram linkage. [1] Grashof's criteria states that the sum of the shortest and longest links of a planar four-bar linkage cannot be greater than the sum of the remaining two links if there is to be continuous relative rotation between any two links.
2. Besides having knowledge of the extent of the rotations of the links, it would be useful to have a measure of how well a mechanism might "run" before actually building it. Hartenberg mentions that "run" is a term that means effectiveness with which motion is imparted to the output link; it implies smooth operation, in which a maximum force component is available to proce a force or torque in an output member. Although the resulting output force or torque is not only a function of the geometry of the linkage, but is generally the result of dynamic or inertia force, which are often several times as large as the static force. For the analysis of low-speed operations or for an easily obtainable index of how any mechanism might run, the concept of the transmission angle is extremely useful. During the motion of a mechanism, the transmission angle changes in value. A transmission angle of 0 degree may occur at a specific position, on which the output link will not move regardless of how large a force is applied to the input link. In fact, e to friction in the joints, the general rule of thumb, is to design mechanisms with transmission angle of larger than a specified value. Matrix-based definitions have been developed which measure the ability of a linkage to transmit motion. The value of a determinant (which contains derivatives of output motion variables with respect to an input motion variable for a given linkage geometry[2] ) is a measure of the movability of the linkage in a particular position.
1 。在四連桿機構的形式可以採取所謂的曲柄搖桿或雙搖桿或雙曲柄（拖放鏈接）聯系，取決於各種運動的兩個鏈接連接到地面的聯系。輸入曲柄的曲柄搖桿式可旋轉不斷通過360 ，而輸出鏈接「岩石」 （或振盪） 。作為一個特殊情況，在一個平行四邊形的聯系，在那裡的長度等於投入的聯系，在輸出的聯系和長度，耦合器和地面的聯系也相同，都輸入和輸出的聯系完全可以左右轉動或切換成一個越過配置稱為antiparallelogram聯系。 [ 1 ]格拉斯霍夫的標准規定的總和最長和最短的聯系，平面四連桿機構不能加一大於二剩下的兩個環節，這樣才能不斷相對旋轉任意兩個之間的聯系。
2 。除了知識的程度輪換的聯系，這將是有益的措施以及如何可能的機制「運行」建設之前，實際上它。 Hartenberg提到， 「運行」是一個術語，是指有效地傳授運動的輸出環節;這意味著順利運作，其中最大力量的組成部分提供給生產武力或轉矩輸出成員。雖然由此產生的輸出力或力矩不僅是一個函數的幾何的聯系，但通常是由於動態或慣性力，這往往是幾次大的靜力。分析的低速業務或容易獲得的一個指數如何運行機制可能，概念的傳動角是極為有益的。在運動的機制，傳動角的變化值。傳輸角度0度，可能會發生在某一特定的位置，而輸出的聯系將不會不管多麼大的力量適用於輸入鏈接。事實上，由於摩擦的關節，一般的經驗法則，是設計與傳輸機制的角度大於某一特定值。矩陣為基礎的定義，已經制定的措施的能力聯系轉交議案。價值的一個決定因素（其中包含衍生品的輸出變數的議案方面投入的議案變數對某一連鎖幾何[ 2 ] ）是衡量的可移動的聯系在一個特定的立場。