pair ، link و freedom…

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نوع زبان: انگلیسی حجم: 2.46 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 49 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/05/17 12:29:35

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

pair, ., link, mechanism, freedom, degree, kinematic, two, motion, chain, bar, contact,

توجه: این مطلب در تاریخ 2019/05/17 12:29:35 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

https://moodlearn.ariel.ac.il/pluginfile.php/807216/mod_resource/content/1/4-bars.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: pair, ., link, mechanism, freedom, degree, kinematic, two, motion, chain, bar, contact,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

link a component forming a part of a chain generally rigid with provision at each end for connection to two other links mechanism a combination of rigid bodies links connected by kinematic pairs. kinematic pair a joint which is formed by the contact between two bodies and allows relative motion between them. machine a collection of mechanisms which transmit force from the source of power to the resistance to be overcome kinematics a branch of dynamics dealing with motion in time and space but disregarding mass and forces kinetics a branch of physics that deals with the relation of force and changes of motion dynamics a branch of mechanics that deals with matter mass in motion and the forces that produce or change such motion. mechanics deals with force and energy in their relation to the material bodies. terminology a mechanism is defined as a combination of rigid bodies connected by kinematic pairs. a kinematic pair is a joint which is formed by the contact between two bodies and allows relative motion between them. the contact element on a body which joins to form a kinematic pair is called pairing element. kinematic pair kinematic pair each link in the slider crank mechanism shown here has two pairing elements. surface contact pairs are lower pairs. the commonly used lower pairs include ۱ revolute pair ۲ prismatic pair ۳ screw pair ۴ cylindrical pair ۵ spherical pair ۶ planar pair lower kinematic pairs degrees of freedom ۱ symbol r relative motion circular revolute pair pin joint revolute.sldasm degrees of freedom ۱ symbol p relative motion linear prismatic pair slider joint prismatic.sldasm degrees of freedom ۱ symbol h relative motion helical screw pair helical pair screw.sldasm degrees of freedom ۲ symbol c relative motion cylindrical cylindrical pair cylidrical.sldasm degrees of freedom ۳ symbol s relative motion spherical spherical pair globular pair spherical.sldasm degrees of freedom ۳ symbol f relative motion planar planar pair flat pair planar.sldasm higher pairs joints have either a line contact or a point contact. higher pairs exist in cam mechanisms gear trains ball and roller bearings and roll slide joints etc. for planar motion both line contact higher pairs and point contact higher pairs have two degrees of freedom. the only constraint at the contact point is along the common normal. a pin in slot joint rolling contact with sliding is also a higher pair with a line contact between the pin and the slot. higher kinematic pairs higher kinematic pairs higher.sldasm a kinematic chain is an assemblage of links by pairs. when one link of a kinematic chain is held fixed the chain is said to form a mechanism. the fixed link is called the ground link or frame. a closed chain is a consecutive set of links in which the last link is connected to the first. all links have at least two pair elements. there are single loop closed chains and multi loop closed chains. an open chain is the one in which the last link is not connected to the first link. at least one link has a single pair element. kinematic chain a closed chain mechanism. an open chain mechanism. kinematic chain closed ۵ bar linkage.sldasm ground slider crank kinematic chain open fanuc robot.sldasm ground a four bar mechanism is composed of four links including the ground link and four kinematic pairs. planar four bar mechanisms are the simplest closed chains such as crank rocker and slider crank mechanisms. a dyad is a combination of two links connected by a joint. a four bar mechanism is composed of two dyads. many planar mechanisms can be viewed as a combination of a four bar mechanism with one or more dyads. planar four bar mechanism crank rocker a spatial mechanism is one in which one or more links do not move in planar motion. in the rccr mechanism shown here the input blue disk and the output yellow disk move in different planes that are not parallel to each other. the coupler link has three dimensional spatial motion and does not move parallel to a single plane therefore the mechanism is defined as a spatial mechanism. spatial mechanism r revolute r revolute c cylindrical c cylindrical spatial.sldasm the degrees of freedom of a mechanical system is the number of independent inputs required to determine the position of all links of the mechanism. degrees of freedom degrees of freedom of a planar mechanism a planar mechanism containing n links including the ground link has ۳ n ۱ degrees of freedom before they are connected by pairs. a lower pair has the effect of providing two constraints between the connected links. therefore f۱ lower pairs will remove ۲f۱ degrees of freedom from the system. a higher pair provides one constraint. so f۲ higher pairs will remove f۲ degrees of freedom from the system. ۴ bar linkage.sldasm degrees of freedom ۴ bar linkage degrees of freedom ۵ bar linkage ۵ bar linkage.sldasm degrees of freedom crank and slider crank mechanism.sldasm degrees of freedom of a spatial mechanism ball joint.sldasm ball joint ۱.sldasm degrees of freedom of a spatial mechanism degrees of freedom ۵ bar linkage two circuits are possible ۵ bar linkage.sldasm two circuits are possible circuit ۱ circuit ۲ disassembly if after specifying two independent variables defining the linkage position here the angular position of two links connected to ground the number of possible positions of remaining links are finite the number of degrees of freedom is equal ۲ ۵ bar linkage.sldasm two circuits are possible but disasembly is required to move from one circuit to the other circuit ۱ circuit ۲ disassembly if after specifying one independent variable to define the linkage position here the angular position of the red link the number of possible positions of remaining links are finite the number of degrees of freedom is equal ۱ crank rocker.sldasm when three links are joined by a single pin two pairs must be counted. when n links are joined …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: pair, ., link, mechanism, freedom, degree, kinematic, two, motion, chain, bar, contact,

این فایل پاورپوینت شامل 49 اسلاید و به زبان انگلیسی و حجم آن 2.46 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/05/17 12:29:35 استخراج شده است.

https://moodlearn.ariel.ac.il/pluginfile.php/807216/mod_resource/content/1/4-bars.ppt

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