Mastering System Maintainability and MTTR Optimization
Maintainability
Maintainability is the ease and speed with which a system or product can be restored to its normal operating condition after a failure occurs. It is a design quality that focuses on reducing the time and resources required for repairs through features like modularity and accessibility.
Mean Time to Repair (MTTR)
MTTR is the average time taken to repair a failed component or system and return it to service. It includes the time spent on discovery, analysis, actual repair work, and final
Read MoreHybrid and Plug-in Electric Vehicle Technology Explained
1. Compare Conventional HEVs and Gridable (Plug-in) HEVs
| Feature | Conventional HEV | Gridable HEV (PHEV) |
|---|---|---|
| Architecture | Uses an internal combustion engine (ICE) and electric motor but cannot be charged from the grid. | Similar architecture but includes a plug-in charging system connected to the electrical grid. |
| Energy Storage | Smaller battery pack mainly charged by regenerative braking and engine generator. | Larger battery pack that can be charged using external electrical grid. |
| Operating Modes | Electric assist, engine |
Automotive Systems: Suspension, Ignition, Batteries & Drivetrain
Telescopic Shock Absorber
Construction
Cylinder (Outer Tube)
Main body filled with oil. Houses the piston rod and piston.
Piston Rod (Inner Tube)
Moves up and down inside the cylinder. Connected to the vehicle frame.
Piston
Has small orifices and valves for oil flow. Controls damping force.
Oil Reservoir
Space containing hydraulic oil. Provides resistance to piston movement.
Spring
Coil spring mounted around the shock absorber. Supports vehicle load and absorbs shocks.
Base Valve
Located at the bottom of the
Read MorePrecision Metrology: Eden-Rolt Comparator and Machining Techniques
The Eden-Millot Comparator (Eden-Rolt Millionth Comparator)
The Eden-Rolt comparator, more commonly known as the Eden-Rolt millionth comparator, is a highly sensitive measuring instrument used in metrology for high-precision dimensional comparison and gauge calibration.
Principle of Operation
This device uses a combination of mechanical and optical magnification to measure minute differences in size. The core principle involves comparing an unknown dimension to a known reference standard (like a slip
Read MoreAutomotive Lubrication, Injection Systems & Engine Performance
Objectives of Lubrication
Primary Objectives
- Reduce friction – minimizes resistance between moving parts.
- Minimize wear – protects surfaces from damage and extends component life.
- Dissipate heat – carries away heat generated due to friction.
- Form a protective film – prevents direct metal-to-metal contact.
- Enhance efficiency – reduces energy losses during operation.
Secondary Objectives
- Prevent corrosion – acts as a barrier against moisture and chemicals.
- Seal contaminants out – helps in sealing
Mechanical Energy Accumulators and Dissipators
Mechanical Energy Accumulators
This is a device that can store or accumulate a certain amount of mechanical energy and return it when needed.
Types:
- Flywheel: Mechanical energy accumulated in the form of kinetic energy of rotation.
- Elastic Elements: Accumulate energy in the form of elastic potential energy.
Flywheel Details:
Consists of a wheel or disc, made of cast iron or steel, set on the motor shaft that rotates jointly with it.
Elastic Elements Details:
- Springs: These elastic elements are deformed