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影響攪拌車彎道制動(dòng)的因素有攪拌車的質(zhì)心位置、彎道半徑、彎道行駛車速和制動(dòng)力強(qiáng)度，因此本節(jié)通過利用 ADAMS 來找出攪拌車滿載彎道制動(dòng)時(shí)，質(zhì)心不同位置、不同彎道半徑、不同行駛速度、不同制動(dòng)踏板力時(shí)的臨界狀態(tài)，在這里有三個(gè)變量，固定三個(gè)變量，改變第四個(gè)變量的方法來找到。

The factors that affect the bending braking of the mixer truck include the position of the center of mass of the mixer truck, the radius of the curve, the driving speed in the curve and the strength of the braking force. Therefore, this section uses Adams to find out the safety critical state when the mixer truck is braking in the curve with full load, when the center of mass is at different positions, the radius of the curve, the driving speed and the brake pedal force are different. Here there are three variables, fix the three variables and change the fourth variable.

通過改變一個(gè)因素的值，固定其他因素的值來仿真該影響因素對(duì)攪拌質(zhì)心高度的影響。以下為轉(zhuǎn)彎速度、轉(zhuǎn)彎半徑、攪拌車質(zhì)心側(cè)向偏移量、質(zhì)心高度偏移量對(duì)攪拌車轉(zhuǎn)彎制動(dòng)性能的影響：

By changing the value of one factor and fixing the value of other factors, the influence of this influencing factor on the height of mixing center of mass is simulated. The following are the effects of turning speed, turning radius, lateral offset of mass center and height offset of mass center of the mixer on the turning braking performance of the mixer:

攪拌車載重對(duì)攪拌車轉(zhuǎn)彎制動(dòng)的影響仿真分析攪拌在空載轉(zhuǎn)彎制動(dòng)時(shí)其可以得到的不使車輪抱死的大制動(dòng)減速度為 0.4916，制動(dòng)距離為 5.884m，而隨著攪拌車載重的增加，其制動(dòng)減速度隨之減小，制動(dòng)距離隨之增加。

Simulation analysis of the influence of mixer truck load on the turning braking of mixer truck; when the mixer is under no-load turning braking, the large braking deceleration without locking the wheels is 0.4916 and the braking distance is 5.884m. With the increase of mixer truck load, the braking deceleration decreases and the braking distance increases.

這是因?yàn)樵跀嚢柢嚳蛰d時(shí)其質(zhì)心比較低，隨著載重的增加，其質(zhì)心高度也會(huì)增高，這樣由于離心力造成的內(nèi)外側(cè)車輪的載荷轉(zhuǎn)移增加，因此在制動(dòng)時(shí)前后軸的載荷轉(zhuǎn)移很容易造成右后車輪的地面制動(dòng)力小于制動(dòng)器制動(dòng)力，從而產(chǎn)生攪拌車右后車輪的抱死現(xiàn)象。

This is because the mass center of the mixer truck is relatively low when it is unloaded. With the increase of load, the height of its mass center will also increase, so the load transfer of the inner and outer wheels caused by centrifugal force increases. Therefore, the load transfer of the front and rear axles during braking is easy to cause the ground braking force of the right rear wheel to be less than the braking force of the brake, resulting in the locking phenomenon of the right rear wheel of the mixer truck.

如果攪拌車載重在 25t 以下時(shí)其制動(dòng)距離變化速度比較平緩，而當(dāng)載重超過 25t 以后，其制動(dòng)距離增長速度變快，因此得出超載對(duì)攪拌車彎道制動(dòng)影響程度較大，為了應(yīng)嚴(yán)禁超載。

If the load of the mixer truck is below 25t, the change speed of its braking distance is relatively slow, and when the load exceeds 25t, the growth speed of its braking distance becomes faster, so it is concluded that overload has a great impact on the bending braking of the mixer truck, and overload should be strictly prohibited for safety.

攪拌車速度對(duì)其轉(zhuǎn)彎制動(dòng)的影響仿真分析在相同的彎道半徑條件下，攪拌車出現(xiàn)車輪抱死的大制動(dòng)減速度隨著車速的增加降低，車速越快，其減小量越大，而制動(dòng)距離隨著車速的增加而增加。這是因?yàn)閿嚢柢囖D(zhuǎn)彎行駛受到的離心力與攪拌車的車速的平方成正比。

Simulation analysis of the influence of mixer speed on its turning braking under the same curve radius, the large braking deceleration of mixer with wheel locking decreases with the increase of vehicle speed. The faster the vehicle speed, the greater the reduction, and the braking distance increases with the increase of vehicle speed. This is because the centrifugal force received by the mixer when turning is proportional to the square of the speed of the mixer.

自動(dòng)攪拌車車速越快，其所受的離心力越大，攪拌車內(nèi)外側(cè)車輪載荷轉(zhuǎn)移越大，在進(jìn)行制動(dòng)動(dòng)作時(shí)，很小的制動(dòng)減速度就可以導(dǎo)致右側(cè)車輪制動(dòng)器制動(dòng)力大于地面附著力而發(fā)生車輪抱死的情況，如果攪拌車車速大約為38km/h 時(shí)是一個(gè)轉(zhuǎn)折點(diǎn)，在該點(diǎn)之后，制動(dòng)距離隨車速的增加上升的速度大于在該點(diǎn)之前。

The faster the speed of the automatic mixer truck is, the greater the centrifugal force it receives, and the greater the load transfer of the wheels on the inner and outer sides of the mixer truck. During the braking action, a small braking deceleration can cause the braking force of the right wheel brake to be greater than the ground adhesion, resulting in wheel lockup. If the speed of the mixer truck is about 38km/h, it is a turning point. After this point, The braking distance increases faster with the increase of vehicle speed than before this point.

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