MECHATRONICS FINAL EXAM
QUESTIONS WITH 100% CORRECT
ANSWERS!!
1 of 37
Term
What does a variable displacement pump provide?
Give this one a try later!
"Major" losses occur due to friction They are the metering component for
within a pipe, and "minor" losses the fluid flow. The metering of the fluid
occur at a change of section, valve, is done by moving a spool
bend or other interruption. to adjust the orifice area.
, The spool which controls the orifice A variable displacement pump
area is actuated based on a sensed provides the most flexibility,
pressure. but with additional control
complexity.
Don't know?
2 of 37
Term
The primary performance measures for a pump are specified by
what?
Give this one a try later!
1. viscosity of the fluid
2.pipe diameter
3. pipe length
4. number of turns and bend in the pipe circuit
5. surface roughness inside the pipes
6.flow rate
1. Efficiency
2.Max Speed
3.Weight
4. Noise Level
5.Cost
, 1. Displacement in in^3/rev
2.Rated Flow
3. Rated Pressure
4. Rated Power
5. Dynamic Response Bandwith
The pump control element is the actuation mechanism that controls the angular
position of the swash plate.
Don't know?
3 of 37
Definition
There are two major types of pressure relief valves: direct and
indirect acting. Direct acting is held closed by the direct force of a
mechanical spring, while indirect is held closed by a main poppet
that is triggered to open only when a pilot poppet is actuated from
the pressure.
Give this one a try later!
What are the two major types What are the six steps to
of pressure control valves and designing electro-hydraulic
what are the differences? motion control systems?
What are two functions of What are the eight main
an accumulator? components to a hydraulic system?
, Don't know?
4 of 37
Term
What are the steps of the control sizing algorithm?
Give this one a try later!
1. Specifications: the first step in any design is to specify the requirements.
2.System concept design: given the specifications, an appropriate system
design concept must be developed.
3.Component sizing and selection: the proper component types and sizes must
be selected.
4. Control algorithm design.
5. Modeling and simulation.
6.Hardware test: finally, a prototype system must be built and the operation
of the EH system, under the control of the designed control algorithm and
hardware, must be tested.
Step 1: Determine the performance specifications based on load
requirements
Step 2: Pick either displacement per unit stroke for the actuator (D_m or
A_c) or the supply pressure, P_s. Let us assume we pick the displacement (
D_m or A_c). → This selection specifies the actuator size (hydraulic motor or
cylinder).
Step 3: Calculate
Step 4: Assume i = i_(max), calculate the P_s. Add 10-20% to the P_s as a
safety factor.
Step 5: Given the calculated value of Q_(nl) and given the operating input
shaft speed of the pump w_(in), calculate the pump displacement
QUESTIONS WITH 100% CORRECT
ANSWERS!!
1 of 37
Term
What does a variable displacement pump provide?
Give this one a try later!
"Major" losses occur due to friction They are the metering component for
within a pipe, and "minor" losses the fluid flow. The metering of the fluid
occur at a change of section, valve, is done by moving a spool
bend or other interruption. to adjust the orifice area.
, The spool which controls the orifice A variable displacement pump
area is actuated based on a sensed provides the most flexibility,
pressure. but with additional control
complexity.
Don't know?
2 of 37
Term
The primary performance measures for a pump are specified by
what?
Give this one a try later!
1. viscosity of the fluid
2.pipe diameter
3. pipe length
4. number of turns and bend in the pipe circuit
5. surface roughness inside the pipes
6.flow rate
1. Efficiency
2.Max Speed
3.Weight
4. Noise Level
5.Cost
, 1. Displacement in in^3/rev
2.Rated Flow
3. Rated Pressure
4. Rated Power
5. Dynamic Response Bandwith
The pump control element is the actuation mechanism that controls the angular
position of the swash plate.
Don't know?
3 of 37
Definition
There are two major types of pressure relief valves: direct and
indirect acting. Direct acting is held closed by the direct force of a
mechanical spring, while indirect is held closed by a main poppet
that is triggered to open only when a pilot poppet is actuated from
the pressure.
Give this one a try later!
What are the two major types What are the six steps to
of pressure control valves and designing electro-hydraulic
what are the differences? motion control systems?
What are two functions of What are the eight main
an accumulator? components to a hydraulic system?
, Don't know?
4 of 37
Term
What are the steps of the control sizing algorithm?
Give this one a try later!
1. Specifications: the first step in any design is to specify the requirements.
2.System concept design: given the specifications, an appropriate system
design concept must be developed.
3.Component sizing and selection: the proper component types and sizes must
be selected.
4. Control algorithm design.
5. Modeling and simulation.
6.Hardware test: finally, a prototype system must be built and the operation
of the EH system, under the control of the designed control algorithm and
hardware, must be tested.
Step 1: Determine the performance specifications based on load
requirements
Step 2: Pick either displacement per unit stroke for the actuator (D_m or
A_c) or the supply pressure, P_s. Let us assume we pick the displacement (
D_m or A_c). → This selection specifies the actuator size (hydraulic motor or
cylinder).
Step 3: Calculate
Step 4: Assume i = i_(max), calculate the P_s. Add 10-20% to the P_s as a
safety factor.
Step 5: Given the calculated value of Q_(nl) and given the operating input
shaft speed of the pump w_(in), calculate the pump displacement
