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fixed up math rendering
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aburt2 committed Oct 27, 2023
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67 changes: 33 additions & 34 deletions docs/Availability Modelling.md
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| Performance Intensity | $j_p$ | The intensity of the performance, rough indicator of the impact of a performance on the reliability of certain components |
| Performance Frequency | $p_f$ | The average amount of performances per month. It can be used along side **maintenance time between performance**, and **technician availability** to compute the interruption percentage. **SIMULATION ONLY** |
| Technician Availability | $A_{tech}$ | The average amount of hours a technician/luthier is available to fix any issues an artist can’t fix with their instrument per month. **SIMULATION ONLY** |
| Technician Turnaround | $t_{tech}$ | The average amount of business days it takes for the technician/luthier to return the instrument to the artist/musician. **SIMULATION ONLY**
|
| Technician Turnaround | $t_{tech}$ | The average amount of business days it takes for the technician/luthier to return the instrument to the artist/musician. **SIMULATION ONLY** |
## Model Inputs

| **Inputs** | **Symbol** | **Description** |
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### 1. Computing MTBF and failure rate of T-Stick

To compute the Practice interruption rate we must first compute the failure rate of the T-Stick ($$ \lambda_{tstick}$$). We do this by adding the failure rate of each component.
To compute the Practice interruption rate we must first compute the failure rate of the T-Stick ($ \lambda_{tstick}$). We do this by adding the failure rate of each component.

$$$
$$
\begin{equation}
\lambda_{tstick} = \lambda_{esp32} + \lambda_{fsr}+\lambda_{imu}+\lambda_{button}+\lambda_{capsense}+\lambda_{resistor}+\lambda_{touchsensor}+\lambda_{battery}+\lambda_{connectors}
\end{equation}
$$$
$$

where $$\lambda_i$$ is the failure rate of component *i*.
where $\lambda_i$ is the failure rate of component $i$.

The failure rates for several components such as:

Expand All @@ -51,101 +50,101 @@ can be estimated using a combination of the [FIDES reliability prediction too](h

We compute the MTBF of the t stick by taking the reciprocal of the failure rate.

$$$
$$
\begin{equation}
MTBF_{tstick} = \frac{1}{\lambda_{tstick}}
\end{equation}
$$$
$$

### 3. Compute Mean Performances between failure (MPBF)

We can then compute the mean performances between failure ($$MTBF_{tstick}$$) by dividing the $$MTBF_{tstick}$$ by the **performance time (**$$t_P$$)
We can then compute the mean performances between failure ($MTBF_{tstick}$) by dividing the $MTBF_{tstick}$ by the performance time ($t_P$)

$$$
$$
\begin{equation}
MPBF = \frac{MTBF_{tstick}}{t_p}
\end{equation}
$$$
$$

### 4. Compute PIR

We calculate the practice interruption rate by taking the reciprocal of $$MPBF$$.
We calculate the practice interruption rate by taking the reciprocal of $MPBF$.

$$$
$$
\begin{equation}
PIR = \frac{1}{MPBF}
\end{equation}
$$$
$$

Using Eq.5, Eq.6 and Eq.7 we can simplify the PIR expression.
Using Eq.3 and Eq.6 we can simplify the PIR expression.

$$$
$$
\begin{align*}
PIR &= t_p(\frac{1}{MTBF_{tstick}}) \tag{Using Eq.3}\\
&= t_p(\lambda_{tstick}) \tag{Using Eq.6} \\
\end{align*}
$$$
$$

Hence an alternative expression for the Practice Interruption rate is:

$$$
$$
\begin{equation}
PIR = t_p(\lambda_{tstick})
\end{equation}
$$$
$$

In simple words the **Practice Interruption Rate** is the:

$$$
$$
\text{average performance time} \times \text{failure rate of the t-stick}
$$$
$$

## Compute Performance/Maintenance Ratio (PMR)

Computing the Performance/Maintenance Ratio (PMR) is a matter of taking the $$MTBF_{tstick}$$ computed in the PIR model and dividing that by the average maintenance time.
Computing the Performance/Maintenance Ratio (PMR) is a matter of taking the $MTBF_{tstick}$ computed in the PIR model and dividing that by the average maintenance time.

### Computing Average Maintenance time ($$T_m$$)

To compute average maintenance time we consider the mean time to repair ($$MTTR_c$$) of each component and the failure rate of each component ($$\lambda_c$$). We can then take a weighted average of all the repair by taking into account each components contribution to the total failure rate.
To compute average maintenance time we consider the mean time to repair ($MTTR_c$) of each component and the failure rate of each component ($\lambda_c$). We can then take a weighted average of all the repair by taking into account each components contribution to the total failure rate.

$$$
$$
\begin{equation}
T_m = \sum_{c=0}^n \frac{\lambda_c}{\lambda_{tstick}}(MTTR_c)
\end{equation}
$$$
$$

### Compute PMR

To compute PMR we divide the $$MTBF_{tstick}$$ by the average maintenance time ($$T_m$$).
To compute PMR we divide the $MTBF_{tstick}$ by the average maintenance time ($T_m$).

$$$
$$
\begin{equation}
PMR = \frac{MTBF_{tstick}}{T_m}
\end{equation}
$$$
$$

## Compute Direct Maintenance Costs (DMC)

We can also look at the direct maintenance cost of the T-Stick which we define as the dollars spent on maintaining the T-Stick per performance hour.

### Compute Mean Repair Cost of the T Stick

The mean repair cost of the T-Stick ($$MRC_{tstick}$$) is computed the same way the average maintenance time, by using a weighted average of the mean repair cost of each component.
The mean repair cost of the T-Stick ($MRC_{tstick}$) is computed the same way the average maintenance time, by using a weighted average of the mean repair cost of each component.

$$$
$$
\begin{equation}
MRC_{tstick} = \sum_{c=0}^n \frac{\lambda_c}{\lambda_{tstick}}(MRC_c)
\end{equation}
$$$
$$

### Compute DMC

To compute DMC we divide the mean repair cost by the mean time between failure of the T-Stick ($$MTBF_{tstick}$$)
To compute DMC we divide the mean repair cost by the mean time between failure of the T-Stick ($MTBF_{tstick}$)

$$$
$$
\begin{equation}
DMC = \frac{MRC_{tstick}}{MTBF_{tstick}}
\end{equation}
$$$
$$


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7 changes: 4 additions & 3 deletions docs/index.html
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content="width=device-width, initial-scale=1, minimum-scale=1.0, shrink-to-fit=no, viewport-fit=cover">

<!-- Replace with your own title and description. -->
<title>Awesome Docsify Site</title>
<meta name="description" content="An awesome docsify site for publishing some content on the web.">
<title>T-Stick Documentation</title>
<link rel="icon" href="Images/favicon.ico" />
<meta name="description" content="Website containing documentation related to the T-Stick">

<!-- Default Theme (see https://docsify.js.org/#/themes) -->
<link rel="stylesheet" href="//cdn.jsdelivr.net/npm/docsify@4/lib/themes/vue.css">
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name: 'T-Stick Documentation',

// Logo configuration
logo: '/Images/IDMIL-logo-new-vector-trBG.svg',
logo: '/Images/IDMIL-logo-icon.png',

// Sidebar Configuration
auto2top: true,
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